Table 1 Percent of Cross Section of Conduit and Tubing for Conductors and Cables.
| Number of Conductors and/or Cables | Cross-Sectional Area (%) |
|---|---|
| 1 | 53 |
| 2 | 31 |
| Over 2 | 40 |
Informational Note No. 1: Table 1 is based on common conditions of proper cabling and alignment of conductors where the length of the pull and the number of bends are within reasonable limits. It should be recognized that, for certain conditions, a larger size conduit or a lesser conduit fill should be considered.
Informational Note No. 2: When pulling three conductors or cables into a raceway, if the ratio of the raceway (inside diameter) to the conductor or cable (outside diameter) is between 2.8 and 3.2, jamming can occur. While jamming can occur when pulling four or more conductors or cables into a raceway, the probability is very low.
Notes to Tables.
(1) See Informative Annex C for the maximum number of conductors and fixture wires, all of the same size (total cross-sectional area including insulation) permitted in trade sizes of the applicable conduit or tubing.
(2) Table 1 applies only to complete conduit or tubing systems and is not intended to apply to sections of conduit or tubing used to protect exposed wiring and cable from physical damage.
(3) Equipment grounding or bonding conductors, where installed, shall be included when calculating conduit or tubing fill. The actual dimensions of the equipment grounding or bonding conductor (insulated or bare) shall be used in the calculation.
(4) Where conduit or tubing nipples, not including connectors, having a maximum length not to exceed 600 mm (24 in.) are installed between boxes, cabinets, and similar enclosures, the nipples shall be permitted to be filled to 60 percent of their total cross-sectional area, and 310.15(C)(1) adjustment factors need not apply to this condition.
(5) For conductors not included in Chapter 9, such as multiconductor cables and optical fiber cables, the actual dimensions shall be used.
(6) For combinations of conductors of different sizes, use actual dimensions or Table 5 and Table 5A for dimensions of conductors and Table 4 for the applicable conduit or tubing dimensions.
(7) When calculating the maximum number of conductors or cables permitted in a conduit or tubing, all of the same size (total cross-sectional area including insulation), the next higher whole number shall be used to determine the maximum number of conductors permitted when the calculation results in a decimal greater than or equal to 0.8. When calculating the size for conduit or tubing permitted for a single conductor, one conductor shall be permitted when the calculation results in a decimal greater than or equal to 0.8.
(8) Where bare conductors are permitted by other sections of this Code, the dimensions for bare conductors in Table 8 shall be permitted.
(9) A multiconductor cable, optical fiber cable, or flexible cord of two or more conductors shall be treated as a single conductor for calculating percentage conduit or tubing fill area. For cables that have elliptical cross sections, the cross-sectional area calculation shall be based on using the major diameter of the ellipse as a circle diameter. Assemblies of single insulated conductors without an overall covering shall not be considered a cable when determining conduit or tubing fill area. The conduit or tubing fill for the assemblies shall be calculated based upon the individual conductors.
(10) The values for approximate conductor diameter and area shown in Table 5 are based on worst-case scenario and indicate round concentric-lay-stranded conductors. Solid and round concentric-lay-stranded conductor values are grouped together for the purpose of Table 5. Round compact-stranded conductor values are shown in Table 5A. If the actual values of the conductor diameter and area are known, they shall be permitted to be used.
Table 2 Radius of Conduit and Tubing Bends.
| Conduit or Tubing Size | One Shot and Full Shoe Benders | Other Bends | |||
|---|---|---|---|---|---|
| Metric Designator | Trade Size | mm | in. | mm | in. |
| 16 | 1/2 | 101.6 | 4 | 101.6 | 4 |
| 21 | 3/4 | 114.3 | 41/2 | 127 | 5 |
| 27 | 1 | 146.05 | 53/4 | 152.4 | 6 |
| 35 | 11/4 | 184.15 | 71/4 | 203.2 | 8 |
| 41 | 11/2 | 209.55 | 81/4 | 254 | 10 |
| 53 | 2 | 241.3 | 91/2 | 304.8 | 12 |
| 63 | 21/2 | 266.7 | 101/2 | 381 | 15 |
| 78 | 3 | 330.2 | 13 | 457.2 | 18 |
| 91 | 31/2 | 381 | 15 | 533.4 | 21 |
| 103 | 4 | 406.4 | 16 | 609.6 | 24 |
| 129 | 5 | 609.6 | 24 | 762 | 30 |
| 155 | 6 | 762 | 30 | 914.4 | 36 |
Table 4 Dimensions and Percent Area of Conduit and Tubing (Areas of Conduit or Tubing for the Combinations of Wires Permitted in Table 1, Chapter 9).
| Article 358 - Electrical Metallic Tubing (EMT) | |||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 16 | 1/2 | 78 | 0.122 | 118 | 0.182 | 104 | 0.161 | 61 | 0.094 | 15.8 | 0.622 | 196 | 0.304 |
| 21 | 3/4 | 137 | 0.213 | 206 | 0.320 | 182 | 0.283 | 106 | 0.165 | 20.9 | 0.824 | 343 | 0.533 |
| 27 | 1 | 222 | 0.346 | 333 | 0.519 | 295 | 0.458 | 172 | 0.268 | 26.6 | 1.049 | 556 | 0.864 |
| 35 | 11/4 | 387 | 0.598 | 581 | 0.897 | 513 | 0.793 | 300 | 0.464 | 35.1 | 1.380 | 968 | 1.496 |
| 41 | 11/2 | 526 | 0.814 | 788 | 1.221 | 696 | 1.079 | 407 | 0.631 | 40.9 | 1.610 | 1314 | 2.036 |
| 53 | 2 | 866 | 1.342 | 1299 | 2.013 | 1147 | 1.778 | 671 | 1.040 | 52.5 | 2.067 | 2165 | 3.356 |
| 63 | 21/2 | 1513 | 2.343 | 2270 | 3.515 | 2005 | 3.105 | 1173 | 1.816 | 69.4 | 2.731 | 3783 | 5.858 |
| 78 | 3 | 2280 | 3.538 | 3421 | 5.307 | 3022 | 4.688 | 1767 | 2.742 | 85.2 | 3.356 | 5701 | 8.846 |
| 91 | 31/2 | 2980 | 4.618 | 4471 | 6.927 | 3949 | 6.119 | 2310 | 3.579 | 97.4 | 3.834 | 7451 | 11.545 |
| 103 | 4 | 3808 | 5.901 | 5712 | 8.852 | 5046 | 7.819 | 2951 | 4.573 | 110.1 | 4.334 | 9521 | 14.753 |
| 129 | 5 | 5220 | 8.085 | 7830 | 12.127 | 6916 | 10.713 | 4045 | 6.266 | 128.9 | 5.073 | 13050 | 20.212 |
| 155 | 6 | 7528 | 11.663 | 11292 | 17.495 | 9975 | 15.454 | 5834 | 9.039 | 154.8 | 6.093 | 18821 | 29.158 |
| Article 362 - Electrical Non-Metallic Tubing (ENT) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 16 | 1/2 | 73 | 0.114 | 110 | 0.171 | 97 | 0.151 | 57 | 0.088 | 15.3 | 0.602 | 184 | 0.285 |
| 21 | 3/4 | 131 | 0.203 | 197 | 0.305 | 174 | 0.269 | 102 | 0.157 | 20.4 | 0.804 | 328 | 0.508 |
| 27 | 1 | 215 | 0.333 | 322 | 0.499 | 284 | 0.441 | 166 | 0.258 | 26.1 | 1.029 | 537 | 0.832 |
| 35 | 11/4 | 375 | 0.581 | 562 | 0.872 | 497 | 0.770 | 291 | 0.450 | 34.5 | 1.36 | 937 | 1.453 |
| 41 | 11/2 | 512 | 0.794 | 769 | 1.191 | 679 | 1.052 | 397 | 0.616 | 40.4 | 1.59 | 1281 | 1.986 |
| 53 | 2 | 849 | 1.316 | 1274 | 1.975 | 1125 | 1.744 | 658 | 1.020 | 52 | 2.047 | 2123 | 3.291 |
| 63 | 21/2 | - | - | - | - | - | - | - | - | - | - | - | - |
| 78 | 3 | - | - | - | - | - | - | - | - | - | - | - | - |
| 91 | 31/2 | - | - | - | - | - | - | - | - | - | - | - | - |
| Article 348 - Flexible Metal Conduit (FMC) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 12 | 3/8 | 30 | 0.046 | 44 | 0.069 | 39 | 0.061 | 23 | 0.036 | 9.7 | 0.384 | 74 | 0.116 |
| 16 | 1/2 | 81 | 0.127 | 122 | 0.190 | 108 | 0.168 | 63 | 0.098 | 16.1 | 0.635 | 204 | 0.317 |
| 21 | 3/4 | 137 | 0.213 | 206 | 0.320 | 182 | 0.283 | 106 | 0.165 | 20.9 | 0.824 | 343 | 0.533 |
| 27 | 1 | 211 | 0.327 | 316 | 0.490 | 279 | 0.433 | 163 | 0.253 | 25.9 | 1.020 | 527 | 0.817 |
| 35 | 11/4 | 330 | 0.511 | 495 | 0.766 | 437 | 0.677 | 256 | 0.396 | 32.4 | 1.275 | 824 | 1.277 |
| 41 | 11/2 | 480 | 0.743 | 720 | 1.115 | 636 | 0.985 | 372 | 0.576 | 39.1 | 1.538 | 1201 | 1.858 |
| 53 | 2 | 843 | 1.307 | 1264 | 1.961 | 1117 | 1.732 | 653 | 1.013 | 51.8 | 2.040 | 2107 | 3.269 |
| 63 | 21/2 | 1267 | 1.963 | 1900 | 2.945 | 1678 | 2.602 | 982 | 1.522 | 63.5 | 2.500 | 3167 | 4.909 |
| 78 | 3 | 1824 | 2.827 | 2736 | 4.241 | 2417 | 3.746 | 1414 | 2.191 | 76.2 | 3.000 | 4560 | 7.069 |
| 91 | 31/2 | 2483 | 3.848 | 3724 | 5.773 | 3290 | 5.099 | 1924 | 2.983 | 88.9 | 3.500 | 6207 | 9.621 |
| 103 | 4 | 3243 | 5.027 | 4864 | 7.540 | 4297 | 6.660 | 2513 | 3.896 | 101.6 | 4.000 | 8107 | 12.566 |
| Article 342 - Intermediate Metal Conduit (IMC) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 12 | 3/8 | - | - | - | - | - | - | - | - | - | - | - | - |
| 16 | 1/2 | 89 | 0.137 | 133 | 0.205 | 117 | 0.181 | 69 | 0.106 | 16.8 | 0.660 | 222 | 0.342 |
| 21 | 3/4 | 151 | 0.235 | 226 | 0.352 | 200 | 0.311 | 117 | 0.182 | 21.9 | 0.864 | 377 | 0.586 |
| 27 | 1 | 248 | 0.384 | 372 | 0.575 | 329 | 0.508 | 192 | 0.297 | 28.1 | 1.105 | 620 | 0.959 |
| 35 | 11/4 | 425 | 0.659 | 638 | 0.988 | 564 | 0.873 | 330 | 0.510 | 36.8 | 1.448 | 1064 | 1.647 |
| 41 | 11/2 | 573 | 0.890 | 859 | 1.335 | 759 | 1.179 | 444 | 0.690 | 42.7 | 1.683 | 1432 | 2.225 |
| 53 | 2 | 937 | 1.452 | 1405 | 2.178 | 1241 | 1.924 | 726 | 1.125 | 54.6 | 2.150 | 2341 | 3.630 |
| 63 | 21/2 | 1323 | 2.054 | 1985 | 3.081 | 1753 | 2.722 | 1026 | 1.592 | 64.9 | 2.557 | 3308 | 5.135 |
| 78 | 3 | 2046 | 3.169 | 3069 | 4.753 | 2711 | 4.199 | 1586 | 2.456 | 80.7 | 3.176 | 5115 | 7.922 |
| 91 | 31/2 | 2729 | 4.234 | 4093 | 6.351 | 3616 | 5.610 | 2115 | 3.281 | 93.2 | 3.671 | 6822 | 10.584 |
| 103 | 4 | 3490 | 5.452 | 5235 | 8.179 | 4624 | 7.224 | 2705 | 4.226 | 105.4 | 4.166 | 8725 | 13.631 |
| 129 | 5 | 5455 | 8.528 | 8183 | 12.792 | 7229 | 11.30 | 4228 | 6.610 | 131.78 | 5.210 | 13639 | 21.32 |
| 155 | 6 | 7878 | 12.304 | 11817 | 18.456 | 10439 | 16.302 | 6106 | 9.536 | 158.36 | 6.258 | 19696 | 30.76 |
| Article 356 - Liquidtight Flexible Nonmetallic Conduit (LFNC-A*) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 12 | 3/8 | 50 | 0.077 | 75 | 0.115 | 66 | 0.102 | 39 | 0.060 | 12.6 | 0.495 | 125 | 0.192 |
| 16 | 1/2 | 80 | 0.125 | 121 | 0.187 | 107 | 0.165 | 62 | 0.097 | 16.0 | 0.630 | 201 | 0.312 |
| 21 | 3/4 | 139 | 0.214 | 208 | 0.321 | 184 | 0.283 | 107 | 0.166 | 21.0 | 0.825 | 346 | 0.535 |
| 27 | 1 | 221 | 0.342 | 331 | 0.513 | 292 | 0.453 | 171 | 0.265 | 26.5 | 1.043 | 552 | 0.854 |
| 35 | l1/4 | 387 | 0.601 | 581 | 0.901 | 513 | 0.796 | 300 | 0.466 | 35.1 | 1.383 | 968 | 1.502 |
| 41 | 11/2 | 520 | 0.807 | 781 | 1.211 | 690 | 1.070 | 403 | 0.626 | 40.7 | 1.603 | 1301 | 2.018 |
| 53 | 2 | 863 | 1.337 | 1294 | 2.006 | 1143 | 1.772 | 669 | 1.036 | 52.4 | 2.063 | 2157 | 3.343 |
| *Corresponds to 356.2(1). | |||||||||||||
| Article 356 - Liquidtight Flexible Nonmetallic Conduit (LFNC-B*) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 12 | 3/8 | 49 | 0.077 | 74 | 0.115 | 65 | 0.102 | 38 | 0.059 | 12.5 | 0.494 | 123 | 0.192 |
| 16 | 1/2 | 81 | 0.125 | 122 | 0.188 | 108 | 0.166 | 63 | 0.097 | 16.1 | 0.632 | 204 | 0.314 |
| 21 | 3/4 | 140 | 0.216 | 210 | 0.325 | 185 | 0.287 | 108 | 0.168 | 21.1 | 0.830 | 350 | 0.541 |
| 27 | 1 | 226 | 0.349 | 338 | 0.524 | 299 | 0.462 | 175 | 0.270 | 26.8 | 1.054 | 564 | 0.873 |
| 35 | 11/4 | 394 | 0.611 | 591 | 0.917 | 522 | 0.810 | 305 | 0.474 | 35.4 | 1.395 | 984 | 1.528 |
| 41 | 11/2 | 510 | 0.792 | 765 | 1.188 | 676 | 1.050 | 395 | 0.614 | 40.3 | 1.588 | 1276 | 1.981 |
| 53 | 2 | 836 | 1.298 | 1255 | 1.948 | 1108 | 1.720 | 648 | 1.006 | 51.6 | 2.033 | 2091 | 3.246 |
| *Corresponds to 356.2(2). | |||||||||||||
| Article 356 - Liquidtight Flexible Nonmetallic Conduit (LFNC-C*) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 12 | 3/8 | 47.7 | 0.074 | 71.5 | 0.111 | 63.2 | 0.098 | 36.9 | 0.057 | 12.3 | 0.485 | 119.19 | 0.185 |
| 16 | 1/2 | 77.9 | 0.121 | 116.9 | 0.181 | 103.2 | 0.160 | 60.4 | 0.094 | 15.7 | 0.620 | 194.778 | 0.302 |
| 21 | 3/4 | 134.6 | 0.209 | 201.9 | 0.313 | 178.4 | 0.276 | 104.3 | 0.162 | 20.7 | 0.815 | 336.568 | 0.522 |
| 27 | 1 | 215.0 | 0.333 | 322.5 | 0.500 | 284.9 | 0.442 | 166.6 | 0.258 | 26.2 | 1.030 | 537.566 | 0.833 |
| 35 | 11/4 | 380.4 | 0.590 | 570.6 | 0.884 | 504.1 | 0.781 | 294.8 | 0.457 | 34.8 | 1.370 | 951.039 | 1.474 |
| 41 | 11/2 | 509.2 | 0.789 | 763.8 | 1.184 | 674.7 | 1.046 | 394.6 | 0.612 | 40.3 | 1.585 | 1272.963 | 1.973 |
| 53 | 2 | 847.6 | 1.314 | 1271.4 | 1.971 | 1123.1 | 1.741 | 656.9 | 1.018 | 51.9 | 2.045 | 2119.063 | 3.285 |
| *Corresponds to 356.2(3). | |||||||||||||
| Article 350 - Liquidtight Flexible Metal Conduit (LFMC) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 12 | 3/8 | 49 | 0.077 | 74 | 0.115 | 65 | 0.102 | 38 | 0.059 | 12.5 | 0.494 | 123 | 0.192 |
| 16 | 1/2 | 81 | 0.125 | 122 | 0.188 | 108 | 0.166 | 63 | 0.097 | 16.1 | 0.632 | 204 | 0.314 |
| 21 | 3/4 | 140 | 0.216 | 210 | 0.325 | 185 | 0.287 | 108 | 0.168 | 21.1 | 0.830 | 350 | 0.541 |
| 27 | 1 | 226 | 0.349 | 338 | 0.524 | 299 | 0.462 | 175 | 0.270 | 26.8 | 1.054 | 564 | 0.873 |
| 35 | 11/4 | 394 | 0.611 | 591 | 0.917 | 522 | 0.810 | 305 | 0.474 | 35.4 | 1.395 | 984 | 1.528 |
| 41 | 11/2 | 510 | 0.792 | 765 | 1.188 | 676 | 1.050 | 395 | 0.614 | 40.3 | 1.588 | 1276 | 1.981 |
| 53 | 2 | 836 | 1.298 | 1255 | 1.948 | 1108 | 1.720 | 648 | 1.006 | 51.6 | 2.033 | 2091 | 3.246 |
| 63 | 21/2 | 1259 | 1.953 | 1888 | 2.929 | 1668 | 2.587 | 976 | 1.513 | 63.3 | 2.493 | 3147 | 4.881 |
| 78 | 3 | 1931 | 2.990 | 2896 | 4.485 | 2559 | 3.962 | 1497 | 2.317 | 78.4 | 3.085 | 4827 | 7.475 |
| 91 | 31/2 | 2511 | 3.893 | 3766 | 5.839 | 3327 | 5.158 | 1946 | 3.017 | 89.4 | 3.520 | 6277 | 9.731 |
| 103 | 4 | 3275 | 5.077 | 4912 | 7.615 | 4339 | 6.727 | 2538 | 3.935 | 102.1 | 4.020 | 8187 | 12.692 |
| 129 | 5 | - | - | - | - | - | - | - | - | - | - | - | - |
| 155 | 6 | - | - | - | - | - | - | - | - | - | - | - | - |
| Article 344 - Rigid Metal Conduit (RMC) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 12 | 3/8 | - | - | - | - | - | - | - | - | - | - | - | - |
| 16 | 1/2 | 81 | 0.125 | 122 | 0.188 | 108 | 0.166 | 63 | 0.097 | 16.1 | 0.632 | 204 | 0.314 |
| 21 | 3/4 | 141 | 0.220 | 212 | 0.329 | 187 | 0.291 | 109 | 0.170 | 21.2 | 0.836 | 353 | 0.549 |
| 27 | 1 | 229 | 0.355 | 344 | 0.532 | 303 | 0.470 | 177 | 0.275 | 27.0 | 1.063 | 573 | 0.887 |
| 35 | 11/4 | 394 | 0.610 | 591 | 0.916 | 522 | 0.809 | 305 | 0.473 | 35.4 | 1.394 | 984 | 1.526 |
| 41 | 11/2 | 533 | 0.829 | 800 | 1.243 | 707 | 1.098 | 413 | 0.642 | 41.2 | 1.624 | 1333 | 2.071 |
| 53 | 2 | 879 | 1.363 | 1319 | 2.045 | 1165 | 1.806 | 681 | 1.056 | 52.9 | 2.083 | 2198 | 3.408 |
| 63 | 21/2 | 1255 | 1.946 | 1882 | 2.919 | 1663 | 2.579 | 972 | 1.508 | 63.2 | 2.489 | 3137 | 4.866 |
| 78 | 3 | 1936 | 3.000 | 2904 | 4.499 | 2565 | 3.974 | 1500 | 2.325 | 78.5 | 3.090 | 4840 | 7.499 |
| 91 | 31/2 | 2584 | 4.004 | 3877 | 6.006 | 3424 | 5.305 | 2003 | 3.103 | 90.7 | 3.570 | 6461 | 10.010 |
| 103 | 4 | 3326 | 5.153 | 4990 | 7.729 | 4408 | 6.828 | 2578 | 3.994 | 102.9 | 4.050 | 8316 | 12.882 |
| 129 | 5 | 5220 | 8.085 | 7830 | 12.127 | 6916 | 10.713 | 4045 | 6.266 | 128.9 | 5.073 | 13050 | 20.212 |
| 155 | 6 | 7528 | 11.663 | 11292 | 17.495 | 9975 | 15.454 | 5834 | 9.039 | 154.8 | 6.093 | 18821 | 29.158 |
| Article 352 - Rigid PVC Conduit (PVC), Schedule 80 | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 12 | 3/8 | - | - | - | - | - | - | - | - | - | - | - | - |
| 16 | 1/2 | 56 | 0.087 | 85 | 0.130 | 75 | 0.115 | 44 | 0.067 | 13.4 | 0.526 | 141 | 0.217 |
| 21 | 3/4 | 105 | 0.164 | 158 | 0.246 | 139 | 0.217 | 82 | 0.127 | 18.3 | 0.722 | 263 | 0.409 |
| 27 | 1 | 178 | 0.275 | 267 | 0.413 | 236 | 0.365 | 138 | 0.213 | 23.8 | 0.936 | 445 | 0.688 |
| 35 | 11/4 | 320 | 0.495 | 480 | 0.742 | 424 | 0.656 | 248 | 0.383 | 31.9 | 1.255 | 799 | 1.237 |
| 41 | 11/2 | 442 | 0.684 | 663 | 1.027 | 585 | 0.907 | 342 | 0.530 | 37.5 | 1.476 | 1104 | 1.711 |
| 53 | 2 | 742 | 1.150 | 1113 | 1.725 | 983 | 1.523 | 575 | 0.891 | 48.6 | 1.913 | 1855 | 2.874 |
| 63 | 21/2 | 1064 | 1.647 | 1596 | 2.471 | 1410 | 2.183 | 825 | 1.277 | 58.2 | 2.290 | 2660 | 4.119 |
| 78 | 3 | 1660 | 2.577 | 2491 | 3.865 | 2200 | 3.414 | 1287 | 1.997 | 72.7 | 2.864 | 4151 | 6.442 |
| 91 | 31/2 | 2243 | 3.475 | 3365 | 5.213 | 2972 | 4.605 | 1738 | 2.693 | 84.5 | 3.326 | 5608 | 8.688 |
| 103 | 4 | 2907 | 4.503 | 4361 | 6.755 | 3852 | 5.967 | 2253 | 3.490 | 96.2 | 3.786 | 7268 | 11.258 |
| 129 | 5 | 4607 | 7.142 | 6911 | 10.713 | 6105 | 9.463 | 3571 | 5.535 | 121.1 | 4.768 | 11518 | 17.855 |
| 155 | 6 | 6605 | 10.239 | 9908 | 15.359 | 8752 | 13.567 | 5119 | 7.935 | 145.0 | 5.709 | 16513 | 25.598 |
| Articles 352 and 353 - Rigid PVC Conduit (PVC), Schedule 40, and HDPE Conduit (HDPE) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 12 | 3/8 | - | - | - | - | - | - | - | - | - | - | - | - |
| 16 | 1/2 | 74 | 0.114 | 110 | 0.171 | 97 | 0.151 | 57 | 0.088 | 15.3 | 0.602 | 184 | 0.285 |
| 21 | 3/4 | 131 | 0.203 | 196 | 0.305 | 173 | 0.269 | 101 | 0.157 | 20.4 | 0.804 | 327 | 0.508 |
| 27 | 1 | 214 | 0.333 | 321 | 0.499 | 284 | 0.441 | 166 | 0.258 | 26.1 | 1.029 | 535 | 0.832 |
| 35 | 11/4 | 374 | 0.581 | 561 | 0.872 | 495 | 0.770 | 290 | 0.450 | 34.5 | 1.360 | 935 | 1.453 |
| 41 | 11/2 | 513 | 0.794 | 769 | 1.191 | 679 | 1.052 | 397 | 0.616 | 40.4 | 1.590 | 1282 | 1.986 |
| 53 | 2 | 849 | 1.316 | 1274 | 1.975 | 1126 | 1.744 | 658 | 1.020 | 52.0 | 2.047 | 2124 | 3.291 |
| 63 | 21/2 | 1212 | 1.878 | 1817 | 2.817 | 1605 | 2.488 | 939 | 1.455 | 62.1 | 2.445 | 3029 | 4.695 |
| 78 | 3 | 1877 | 2.907 | 2816 | 4.361 | 2487 | 3.852 | 1455 | 2.253 | 77.3 | 3.042 | 4693 | 7.268 |
| 91 | 31/2 | 2511 | 3.895 | 3766 | 5.842 | 3327 | 5.161 | 1946 | 3.018 | 89.4 | 3.521 | 6277 | 9.737 |
| 103 | 4 | 3237 | 5.022 | 4855 | 7.532 | 4288 | 6.654 | 2508 | 3.892 | 101.5 | 3.998 | 8091 | 12.554 |
| 129 | 5 | 5099 | 7.904 | 7649 | 11.856 | 6756 | 10.473 | 3952 | 6.126 | 127.4 | 5.016 | 12748 | 19.761 |
| 155 | 6 | 7373 | 11.427 | 11060 | 17.140 | 9770 | 15.141 | 5714 | 8.856 | 153.2 | 6.031 | 18433 | 28.567 |
| Article 352 - Type A, Rigid PVC Conduit (PVC) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 16 | 1/2 | 100 | 0.154 | 149 | 0.231 | 132 | 0.204 | 77 | 0.119 | 17.8 | 0.700 | 249 | 0.385 |
| 21 | 3/4 | 168 | 0.260 | 251 | 0.390 | 222 | 0.345 | 130 | 0.202 | 23.1 | 0.910 | 419 | 0.650 |
| 27 | 1 | 279 | 0.434 | 418 | 0.651 | 370 | 0.575 | 216 | 0.336 | 29.8 | 1.175 | 697 | 1.084 |
| 35 | 11/4 | 456 | 0.707 | 684 | 1.060 | 604 | 0.937 | 353 | 0.548 | 38.1 | 1.500 | 1140 | 1.767 |
| 41 | 11/2 | 600 | 0.929 | 900 | 1.394 | 795 | 1.231 | 465 | 0.720 | 43.7 | 1.720 | 1500 | 2.324 |
| 53 | 2 | 940 | 1.459 | 1410 | 2.188 | 1245 | 1.933 | 728 | 1.131 | 54.7 | 2.155 | 2350 | 3.647 |
| 63 | 21/2 | 1406 | 2.181 | 2109 | 3.272 | 1863 | 2.890 | 1090 | 1.690 | 66.9 | 2.635 | 3515 | 5.453 |
| 78 | 3 | 2112 | 3.278 | 3169 | 4.916 | 2799 | 4.343 | 1637 | 2.540 | 82.0 | 3.230 | 5281 | 8.194 |
| 91 | 31/2 | 2758 | 4.278 | 4137 | 6.416 | 3655 | 5.668 | 2138 | 3.315 | 93.7 | 3.690 | 6896 | 10.694 |
| 103 | 4 | 3543 | 5.489 | 5315 | 8.234 | 4695 | 7.273 | 2746 | 4.254 | 106.2 | 4.180 | 8858 | 13.723 |
| 129 | 5 | - | - | - | - | - | - | - | - | - | - | - | - |
| 155 | 6 | - | - | - | - | - | - | - | - | - | - | - | - |
| Article 352 - Type EB, Rigid PVC Conduit (PVC) | |||||||||||||
| Metric Designator | Trade Size | Over 2 Wires 40% | 60% | 1 Wire 53% | 2 Wires 31% | Nominal Internal Diameter | Total Area 100% | ||||||
| mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 16 | 1/2 | - | - | - | - | - | - | - | - | - | - | - | - |
| 21 | 3/4 | - | - | - | - | - | - | - | - | - | - | - | - |
| 27 | 1 | - | - | - | - | - | - | - | - | - | - | - | - |
| 35 | 11/4 | - | - | - | - | - | - | - | - | - | - | - | - |
| 41 | 11/2 | - | - | - | - | - | - | - | - | - | - | - | - |
| 53 | 2 | 999 | 1.550 | 1499 | 2.325 | 1324 | 2.053 | 774 | 1.201 | 56.4 | 2.221 | 2498 | 3.874 |
| 63 | 21/2 | - | - | - | - | - | - | - | - | - | - | - | - |
| 78 | 3 | 2248 | 3.484 | 3373 | 5.226 | 2979 | 4.616 | 1743 | 2.700 | 84.6 | 3.330 | 5621 | 8.709 |
| 91 | 31/2 | 2932 | 4.546 | 4397 | 6.819 | 3884 | 6.023 | 2272 | 3.523 | 96.6 | 3.804 | 7329 | 11.365 |
| 103 | 4 | 3726 | 5.779 | 5589 | 8.669 | 4937 | 7.657 | 2887 | 4.479 | 108.9 | 4.289 | 9314 | 14.448 |
| 129 | 5 | 5726 | 8.878 | 8588 | 13.317 | 7586 | 11.763 | 4437 | 6.881 | 135.0 | 5.316 | 14314 | 22.195 |
| 155 | 6 | 8133 | 12.612 | 12200 | 18.918 | 10776 | 16.711 | 6303 | 9.774 | 160.9 | 6.336 | 20333 | 31.530 |
Table 5 Dimensions of Insulated Conductors and Fixture Wires.
| Type | Size (AWG or kcmil) | Approximate Area | Approximate Diameter | ||
|---|---|---|---|---|---|
| mm2 | in.2 | mm | in. | ||
| Type: FFH-2, RFH-1, RFH-2, RFHH-2, RHH*, RHW*, RHW-2*, RHH, RHW, RHW-2, SF-1, SF-2, SFF-1. SFF-2, TF, TFT, THHW, THW, THW-2, TW, XF, XFF | |||||
| RFH-2, FFH-2, RFHH-2 |
18 | 9.355 | 0.0145 | 3.454 | 0.136 |
| 16 | 11.10 | 0.0172 | 3.759 | 0.148 | |
| RHH, RHW, RHW-2 | 14 | 18.90 | 0.0293 | 4.902 | 0.193 |
| 12 | 22.77 | 0.0353 | 5.385 | 0.212 | |
| 10 | 28.19 | 0.0437 | 5.994 | 0.236 | |
| 8 | 53.87 | 0.0835 | 8.280 | 0.326 | |
| 6 | 67.16 | 0.1041 | 9.246 | 0.364 | |
| 4 | 86.00 | 0.1333 | 10.46 | 0.412 | |
| 3 | 98.13 | 0.1521 | 11.18 | 0.440 | |
| 2 | 112.9 | 0.1750 | 11.99 | 0.472 | |
| 1 | 171.6 | 0.2660 | 14.78 | 0.582 | |
| 1/0 | 196.1 | 0.3039 | 15.80 | 0.622 | |
| 2/0 | 226.1 | 0.3505 | 16.97 | 0.668 | |
| 3/0 | 262.7 | 0.4072 | 18.29 | 0 720 | |
| 4/0 | 306.7 | 0.4754 | 19.76 | 0.778 | |
| 250 | 405.9 | 0.6291 | 22.73 | 0.895 | |
| 300 | 457.3 | 0.7088 | 24.13 | 0.950 | |
| 350 | 507.7 | 0.7870 | 25.43 | 1.001 | |
| 400 | 556.5 | 0.8626 | 26.62 | 1.048 | |
| 500 | 650.5 | 1.0082 | 28.78 | 1.133 | |
| 600 | 782.9 | 1.2135 | 31.57 | 1.243 | |
| 700 | 874.9 | 1.3561 | 33.38 | 1.314 | |
| 750 | 920.8 | 1.4272 | 34.24 | 1.348 | |
| 800 | 965.0 | 1.4957 | 35.05 | 1.380 | |
| 900 | 1057 | 1.6377 | 36.68 | 1.444 | |
| 1000 | 1143 | 1.7719 | 38.15 | 1.502 | |
| 1250 | 1515 | 2.3479 | 43.92 | 1.729 | |
| 1500 | 1738 | 2.6938 | 47.04 | 1.852 | |
| 1750 | 1959 | 3.0357 | 49.94 | 1.966 | |
| 2000 | 2175 | 3.3719 | 52.63 | 2.072 | |
| SF-2, SFF-2 | 18 | 7.419 | 0.0115 | 3.073 | 0.121 |
| 16 | 8.968 | 0.0139 | 3.378 | 0.133 | |
| 14 | 11.10 | 0.0172 | 3.759 | 0.148 | |
| SF-1, SFF-1 | 18 | 4.194 | 0.0065 | 2.311 | 0.091 |
| RFH-1, TF, TFF, XF, XFF | 18 | 5.161 | 0.0088 | 2.692 | 0.106 |
| TF, TFF, XF, XFF | 16 | 7.032 | 0.0109 | 2.997 | 0.118 |
| TW, XF, XFF, THHW, THW, THW-2 |
14 | 8.968 | 0.0139 | 3.378 | 0.133 |
| TW, THHW, THW, THW-2 | 12 | 11.68 | 0.0181 | 3.861 | 0.152 |
| 10 | 15.68 | 0.0243 | 4.470 | 0.176 | |
| 8 | 28.19 | 0.0437 | 5.994 | 0.236 | |
| RHH*, RHW*, RHW-2* | 14 | 13.48 | 0.0209 | 4.140 | 0.163 |
| RHH*, RHW*, RHW-2*, XF, XFF | 12 | 16.77 | 0.0260 | 4.623 | 0.182 |
| Type: RHH*, RHW, RHW-2*, THHN, THHW. THW. THW-2, TFN, TFFN, THWN, THWN-2, XF, XFF | |||||
| RHH,* RHW,* RHW-2,* XF, XFF | 10 | 21.48 | 0.0333 | 5.232 | 0.206 |
| RHH*, RHW*, RHW-2* | 8 | 35.87 | 0.0556 | 6.756 | 0.266 |
| TW, THW, THHW. THW-2, RHH*, RHW*, RHW-2* |
6 | 46.84 | 0.0726 | 7.722 | 0.304 |
| 4 | 62.77 | 0.0973 | 8.941 | 0.352 | |
| 3 | 73.16 | 0.1134 | 9.652 | 0.380 | |
| 2 | 86.00 | 0.1333 | 10.46 | 0.412 | |
| 1 | 122.6 | 0.1901 | 12.50 | 0.492 | |
| 1/0 | 143.4 | 0.2223 | 13.51 | 0.532 | |
| 2/0 | 169.3 | 0.2624 | 14.68 | 0.578 | |
| 3/0 | 201.1 | 0.3117 | 16.00 | 0.630 | |
| 4/0 | 239.9 | 0.3718 | 17.48 | 0.688 | |
| 250 | 296.5 | 0.4596 | 19.43 | 0.765 | |
| 300 | 340.7 | 0.5281 | 20.83 | 0.820 | |
| 350 | 384.4 | 0.5958 | 22.12 | 0.871 | |
| 400 | 427.0 | 0.6619 | 23.32 | 0.918 | |
| 500 | 509.7 | 0.7901 | 25.48 | 1.003 | |
| 600 | 627.7 | 0.9729 | 28.27 | 1.113 | |
| 700 | 710.3 | 1.1010 | 30.07 | 1.184 | |
| 750 | 751.7 | 1.1652 | 30.94 | 1.218 | |
| 800 | 791.7 | 1.2272 | 31.75 | 1.250 | |
| 900 | 874.9 | 1.3561 | 33.38 | 1.314 | |
| 1000 | 953.8 | 1.4784 | 34.85 | 1.372 | |
| 1250 | 1200 | 1.8602 | 39.09 | 1.539 | |
| 1500 | 1400 | 2.1695 | 42.21 | 1.662 | |
| 1750 | 1598 | 2.4773 | 45.11 | 1.776 | |
| 2000 | 1795 | 2.7818 | 47.80 | 1.882 | |
| TFN, TFFN | 18 | 3.548 | 0.0055 | 2.134 | 0.084 |
| 16 | 4.645 | 0.0072 | 2.438 | 0.096 | |
| THHN, THWN, THWN-2 | 14 | 6.258 | 0.0097 | 2.819 | 0.111 |
| 12 | 8.581 | 0.0133 | 3.302 | 0.130 | |
| 10 | 13.61 | 0.0211 | 4.166 | 0.164 | |
| 8 | 23.61 | 0.0366 | 5.486 | 0.216 | |
| 6 | 32.71 | 0.0507 | 6.452 | 0.254 | |
| 4 | 53.16 | 0.0824 | 8.230 | 0.324 | |
| 3 | 62.77 | 0.0973 | 8.941 | 0.352 | |
| 2 | 74.71 | 0.1158 | 9.754 | 0.384 | |
| 1 | 100.8 | 0.1562 | 11.33 | 0.446 | |
| 1/0 | 119.7 | 0.1855 | 12.34 | 0.486 | |
| 2/0 | 143.4 | 0.2223 | 13.51 | 0.532 | |
| 3/0 | 172.8 | 0.2679 | 14.83 | 0.584 | |
| 4/0 | 208.8 | 0.3237 | 16.31 | 0.642 | |
| 250 | 256.1 | 0.3970 | 18.06 | 0.711 | |
| 300 | 297.3 | 0.4608 | 19.46 | 0.766 | |
| 350 | 338.2 | 0.5242 | 20.75 | 0.817 | |
| 400 | 378.3 | 0.5863 | 21.95 | 0.864 | |
| 500 | 456.3 | 0.7073 | 24.10 | 0.949 | |
| 600 | 559.7 | 0.8676 | 26.70 | 1.051 | |
| 700 | 637.9 | 0.9887 | 28.50 | 1.122 | |
| 750 | 677.2 | 1.0496 | 29.36 | 1.156 | |
| 800 | 715.2 | 1.1085 | 30.18 | 1.188 | |
| 900 | 794.3 | 1.2311 | 31.80 | 1.252 | |
| 1000 | 869.5 | 1.3478 | 33.27 | 1.310 | |
| PF, PGFF, PGF, PFF, PTF, PAF, PTFF, PAFF |
18 | 3.742 | 0.0058 | 2.184 | 0.086 |
| 16 | 4.839 | 0.0075 | 2.489 | 0.098 | |
| PF, PGFF, PGF PFF, PTF, PAF, PTFF, PAFF, TFE, FEP, PFA, FEPB, PFAH |
14 | 6.452 | 0.0100 | 2.870 | 0.113 |
| TFE, FEP, PFA, FEPB, PFAH | 12 | 8.839 | 0.0137 | 3.353 | 0.132 |
| 10 | 12.32 | 0.0191 | 3.962 | 0.156 | |
| 8 | 21.48 | 0.0333 | 5.232 | 0.206 | |
| 6 | 30.19 | 0.0468 | 6.198 | 0.244 | |
| 4 | 43.23 | 0.0670 | 7.417 | 0.292 | |
| 3 | 51.87 | 0.0804 | 8.128 | 0.320 | |
| 2 | 62.77 | 0.0973 | 8.941 | 0.352 | |
| TFE, PFAH, PFA | 1 | 90.26 | 0.1399 | 10.72 | 0.422 |
| TFE, PFA, PFAH, Z | 1/0 | 108.1 | 0.1676 | 11.73 | 0.462 |
| 2/0 | 130.8 | 0.2027 | 12.90 | 0.508 | |
| 3/0 | 158.9 | 0.2463 | 14.22 | 0.560 | |
| 4/0 | 193.5 | 0.3000 | 15.70 | 0.618 | |
| ZF, ZFF, ZHF | 18 | 2.903 | 0.0045 | 1.930 | 0.076 |
| 16 | 3.935 | 0.0061 | 2.235 | 0.088 | |
| Z, ZF, ZFF, ZHF | 14 | 5.355 | 0.0083 | 2.616 | 0.103 |
| Z | 12 | 7.548 | 0.0117 | 3.099 | 0.122 |
| 10 | 12.32 | 0.0191 | 3.962 | 0.156 | |
| 8 | 19.48 | 0.0302 | 4.978 | 0.196 | |
| 6 | 27.74 | 0.0430 | 5.944 | 0.234 | |
| 4 | 40.32 | 0.0625 | 7.163 | 0.282 | |
| 3 | 55.16 | 0.0855 | 8.382 | 0.330 | |
| 2 | 66.39 | 0.1029 | 9.195 | 0.362 | |
| 1 | 81.87 | 0.1269 | 10.21 | 0.402 | |
| Type: KF-1, KF-2, KFF-1, KFF-2, XHH, XHHW, XHHW-2, ZW | |||||
| XHHW, ZW, XHHW-2, XHH | 14 | 8.968 | 0.0139 | 3.378 | 0.133 |
| 12 | 11.68 | 0.0181 | 3.861 | 0.152 | |
| 10 | 15.68 | 0.0243 | 4.470 | 0.176 | |
| 8 | 28.19 | 0.0437 | 5.994 | 0.236 | |
| 6 | 38.06 | 0.0590 | 6.960 | 0.274 | |
| 4 | 52.52 | 0.0814 | 8.179 | 0.322 | |
| 3 | 62.06 | 0.0962 | 8.890 | 0.350 | |
| 2 | 73.94 | 0.1146 | 9.703 | 0.382 | |
| XHHW, XHHW-2, XHH | 1 | 98.97 | 0.1534 | 11.23 | 0.442 |
| 1/0 | 117.7 | 0.1825 | 12.24 | 0.482 | |
| 2/0 | 141.3 | 0.2190 | 13.41 | 0.528 | |
| 3/0 | 170.5 | 0.2642 | 14.73 | 0.58 | |
| 4/0 | 206.3 | 0.3197 | 16.21 | 0.638 | |
| 250 | 251.9 | 0.3904 | 17.91 | 0.705 | |
| 300 | 292.6 | 0.4536 | 19.30 | 0.76 | |
| 350 | 333.3 | 0.5166 | 20.60 | 0.811 | |
| 400 | 373.0 | 0.5782 | 21.79 | 0.858 | |
| 500 | 450.6 | 0.6984 | 23.95 | 0.943 | |
| 600 | 561.9 | 0.8709 | 26.75 | 1.053 | |
| 700 | 640.2 | 0.9923 | 28.55 | 1.124 | |
| 750 | 679.5 | 1.0532 | 29.41 | 1.158 | |
| 800 | 717.5 | 1.1122 | 30.23 | 1.190 | |
| 900 | 796.8 | 1.2351 | 31.85 | 1.254 | |
| 1000 | 872.2 | 1.3519 | 33.32 | 1.312 | |
| 1250 | 1108 | 1.7180 | 37.57 | 1.479 | |
| 1500 | 1300 | 2.0156 | 40.69 | 1.602 | |
| 1750 | 1492 | 2.3127 | 43.59 | 1.716 | |
| 2000 | 1682 | 2.6073 | 46.28 | 1.822 | |
| KF-2, KFF-2 | 18 | 2.000 | 0.003 | 1.575 | 0.062 |
| 16 | 2.839 | 0.0043 | 1.88 | 0.074 | |
| 14 | 4.129 | 0.0064 | 2.286 | 0.090 | |
| 12 | 6.000 | 0.0092 | 2.743 | 0.108 | |
| 10 | 8.968 | 0.0139 | 3.378 | 0.133 | |
| KF-1, KFF-1 | 18 | 1.677 | 0.0026 | 1.448 | 0.057 |
| 16 | 2.387 | 0.0037 | 1.753 | 0.069 | |
| 14 | 3.548 | 0.0055 | 2.134 | 0.084 | |
| 12 | 5.355 | 0.0083 | 2.616 | 0.103 | |
| 10 | 8.194 | 0.0127 | 3.226 | 0.127 | |
*Types RHH, RHW, and RHW-2 without outer covering.
Table 5A Compact Copper and Aluminum Building Wire Nominal Dimensions** and Areas.
| Size (AWG or kcmil) |
Bare Conductor |
Type RHH* | Types THW and THHW | Type THHN | Type XHHW | Size (AWG or kcmil) |
|||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Diameter | Approximate Diameter |
Approximate Area |
Approximate Diameter |
Approximate Area |
Approximate Diameter |
Approximate Area |
Approximate Diameter |
Approximate Area |
|||||||||||
| mm | in. | mm | in. | mm2 | in.2 | mm | in. | mm2 | in.2 | mm | in. | mm2 | in.2 | mm | in. | mm2 | in.2 | ||
| 8 | 3.404 | 0.134 | 6.604 | 0.260 | 34.25 | 0.0531 | 6.477 | 0.255 | 32.90 | 0.0510 | - | - | - | - | 5.690 | 0.224 | 25.42 | 0.0394 | 8 |
| 6 | 4.293 | 0.169 | 7.493 | 0.295 | 44.10 | 0.0683 | 7.366 | 0.290 | 42.58 | 0.0660 | 6.096 | 0.240 | 29.16 | 0.0452 | 6.604 | 0.260 | 34.19 | 0.0530 | 6 |
| 4 | 5.410 | 0.213 | 8.509 | 0.335 | 56.84 | 0.0881 | 8.509 | 0.335 | 56.84 | 0.0881 | 7.747 | 0.305 | 47.10 | 0.0730 | 7.747 | 0.305 | 47.10 | 0.0730 | 4 |
| 2 | 6.807 | 0.268 | 9.906 | 0.390 | 77.03 | 0.1194 | 9.906 | 0.390 | 77.03 | 0.1194 | 9.144 | 0.360 | 65.61 | 0.1017 | 9.144 | 0.360 | 65.61 | 0.1017 | 2 |
| 1 | 7.595 | 0.299 | 11.81 | 0.465 | 109.5 | 0.1698 | 11.81 | 0.465 | 109.5 | 0.1698 | 10.54 | 0.415 | 87.23 | 0.1352 | 10.54 | 0.415 | 87.23 | 0.1352 | 1 |
| 1/0 | 8.534 | 0.336 | 12.70 | 0.500 | 126.6 | 0.1963 | 12.70 | 0.500 | 126.6 | 0.1963 | 11.43 | 0.450 | 102.6 | 0.1590 | 11.43 | 0.450 | 102.6 | 0.1590 | 1/0 |
| 2/0 | 9.550 | 0.376 | 13.72 | 0.540 | 147.8 | 0.2290 | 13.84 | 0.545 | 150.5 | 0.2332 | 12.57 | 0.495 | 124.1 | 0.1924 | 12.45 | 0.490 | 121.6 | 0.1885 | 2/0 |
| 3/0 | 10.74 | 0.423 | 14.99 | 0.590 | 176.3 | 0.2733 | 14.99 | 0.590 | 176.3 | 0.2733 | 13.72 | 0.540 | 147.7 | 0.2290 | 13.72 | 0.540 | 147.7 | 0.2290 | 3/0 |
| 4/0 | 12.07 | 0.475 | 16.26 | 0.640 | 207.6 | 0.3217 | 16.38 | 0.645 | 210.8 | 0.3267 | 15.11 | 0.595 | 179.4 | 0.2780 | 14.99 | 0.590 | 176.3 | 0.2733 | 4/0 |
| 250 | 13.21 | 0.520 | 18.16 | 0.715 | 259.0 | 0.4015 | 18.42 | 0.725 | 266.3 | 0.4128 | 17.02 | 0.670 | 227.4 | 0.3525 | 16.76 | 0.660 | 220.7 | 0.3421 | 250 |
| 300 | 14.48 | 0.570 | 19.43 | 0.765 | 296.5 | 0.4596 | 19.69 | 0.775 | 304.3 | 0.4717 | 18.29 | 0.720 | 262.6 | 0.4071 | 18.16 | 0.715 | 259.0 | 0.4015 | 300 |
| 350 | 15.65 | 0.616 | 20.57 | 0.810 | 332.3 | 0.5153 | 20.83 | 0.820 | 340.7 | 0.5281 | 19.56 | 0.770 | 300.4 | 0.4656 | 19.30 | 0.760 | 292.6 | 0.4536 | 350 |
| 400 | 16.74 | 0.659 | 21.72 | 0.855 | 370.5 | 0.5741 | 21.97 | 0.865 | 379.1 | 0.5876 | 20.70 | 0.815 | 336.5 | 0.5216 | 20.32 | 0.800 | 324.3 | 0.5026 | 400 |
| 500 | 18.69 | 0.736 | 23.62 | 0.930 | 438.2 | 0.6793 | 23.88 | 0.940 | 447.7 | 0.6939 | 22.48 | 0.885 | 396.8 | 0.6151 | 22.35 | 0.880 | 392.4 | 0.6082 | 500 |
| 600 | 20.65 | 0.813 | 26.29 | 1.035 | 542.8 | 0.8413 | 26.67 | 1.050 | 558.6 | 0.8659 | 25.02 | 0.985 | 491.6 | 0.7620 | 24.89 | 0.980 | 486.6 | 0.7542 | 600 |
| 700 | 22.28 | 0.877 | 27.94 | 1.100 | 613.1 | 0.9503 | 28.19 | 1.110 | 624.3 | 0.9676 | 26.67 | 1.050 | 558.6 | 0.8659 | 26.67 | 1.050 | 558.6 | 0.8659 | 700 |
| 750 | 23.06 | 0.908 | 28.83 | 1.135 | 652.8 | 1.0118 | 29.21 | 1.150 | 670.1 | 1.0386 | 27.31 | 1.075 | 585.5 | 0.9076 | 27.69 | 1.090 | 602.0 | 0.9331 | 750 |
| 900 | 25.37 | 0.999 | 31.50 | 1.240 | 779.3 | 1.2076 | 31.09 | 1.224 | 759.1 | 1.1766 | 30.33 | 1.194 | 722.5 | 1.1196 | 29.69 | 1.169 | 692.3 | 1.0733 | 900 |
| 1000 | 26.92 | 1.060 | 32.64 | 1.285 | 836.6 | 1.2968 | 32.64 | 1.285 | 836.6 | 1.2968 | 31.88 | 1.255 | 798.1 | 1.2370 | 31.24 | 1.230 | 766.6 | 1.1882 | 1000 |
*Types RHH and RHW without outer coverings.
**Dimensions are from industry sources.
Table 8 Conductor Properties.
| Size (AWG or kcmil) |
Area | Conductors | Direct-Current Resistance at 75°C (167°F) | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Stranding | Overall | Copper | Aluminum | ||||||||||||
| Quantity | Diameter | Diameter | Area | Uncoated | Coated | ||||||||||
| mm2 | Circular mils | mm | in. | mm | in. | mm2 | in.2 | ohm/km | ohm/kFT | ohm/km | ohm/kFT | ohm/km | ohm/kFT | ||
| 18 | 0.823 | 1620 | 1 | - | - | 1.02 | 0.040 | 0.823 | 0.001 | 25.5 | 7.77 | 26.5 | 8.08 | 42.0 | 12.8 |
| 18 | 0.823 | 1620 | 7 | 0.39 | 0.015 | 1.16 | 0.046 | 1.06 | 0.002 | 26.1 | 7.95 | 27.7 | 8.45 | 42.8 | 13.1 |
| 16 | 1.31 | 2580 | 1 | - | - | 1.29 | 0.051 | 1.31 | 0.002 | 16.0 | 4.89 | 16.7 | 5.08 | 26.4 | 8.05 |
| 16 | 1.31 | 2580 | 7 | 0.49 | 0.019 | 1.46 | 0.058 | 1.68 | 0.003 | 16.4 | 4.99 | 17.3 | 5.29 | 26.9 | 8.21 |
| 14 | 2.08 | 4110 | 1 | - | - | 1.63 | 0.064 | 2.08 | 0.003 | 10.1 | 3.07 | 10.4 | 3.19 | 16.6 | 5.06 |
| 14 | 2.08 | 4110 | 7 | 0.62 | 0.024 | 1.85 | 0.073 | 2.68 | 0.004 | 10.3 | 3.14 | 10.7 | 3.26 | 16.9 | 5.17 |
| 12 | 3.31 | 6530 | 1 | - | - | 2.05 | 0.081 | 3.31 | 0.005 | 6.34 | 1.93 | 6.57 | 2.01 | 10.45 | 3.18 |
| 12 | 3.31 | 6530 | 7 | 0.78 | 0.030 | 2.32 | 0.092 | 4.25 | 0.006 | 6.50 | 1.98 | 6.73 | 2.05 | 10.69 | 3.25 |
| 10 | 5.261 | 10380 | 1 | - | - | 2.588 | 0.102 | 5.26 | 0.008 | 3.984 | 1.21 | 4.148 | 1.26 | 6.561 | 2.00 |
| 10 | 5.261 | 10380 | 7 | 0.98 | 0.038 | 2.95 | 0.116 | 6.76 | 0.011 | 4.070 | 1.24 | 4.226 | 1.29 | 6.679 | 2.04 |
| 8 | 8.367 | 16510 | 1 | - | - | 3.264 | 0.128 | 8.37 | 0.013 | 2.506 | 0.764 | 2.579 | 0.786 | 4.125 | 1.26 |
| 8 | 8.367 | 16510 | 7 | 1.23 | 0.049 | 3.71 | 0.146 | 10.76 | 0.017 | 2.551 | 0.778 | 2.653 | 0.809 | 4.204 | 1.28 |
| 6 | 13.30 | 26240 | 7 | 1.56 | 0.061 | 4.67 | 0.184 | 17.09 | 0.027 | 1.608 | 0.491 | 1.671 | 0.510 | 2.652 | 0.808 |
| 4 | 21.15 | 41740 | 7 | 1.96 | 0.077 | 5.89 | 0.232 | 27.19 | 0.042 | 1.010 | 0.308 | 1.053 | 0.321 | 1.666 | 0.508 |
| 3 | 26.67 | 52620 | 7 | 2.20 | 0.087 | 6.60 | 0.260 | 34.28 | 0.053 | 0.802 | 0.245 | 0.833 | 0.254 | 1.320 | 0.403 |
| 2 | 33.62 | 66360 | 7 | 2.47 | 0.097 | 7.42 | 0.292 | 43.23 | 0.067 | 0.634 | 0.194 | 0.661 | 0.201 | 1.045 | 0.319 |
| 1 | 42.41 | 83690 | 19 | 1.69 | 0.066 | 8.43 | 0.332 | 55.80 | 0.087 | 0.505 | 0.154 | 0.524 | 0.160 | 0.829 | 0.253 |
| 1/0 | 53.49 | 105600 | 19 | 1.89 | 0.074 | 9.45 | 0.372 | 70.41 | 0.109 | 0.399 | 0.122 | 0.415 | 0.127 | 0.660 | 0.201 |
| 2/0 | 67.43 | 133100 | 19 | 2.13 | 0.084 | 10.62 | 0.418 | 88.74 | 0.137 | 0.3170 | 0.0967 | 0.329 | 0.101 | 0.523 | 0.159 |
| 3/0 | 85.01 | 167800 | 19 | 2.39 | 0.094 | 11.94 | 0.470 | 111.9 | 0.173 | 0.2512 | 0.0766 | 0.2610 | 0.0797 | 0.413 | 0.126 |
| 4/0 | 107.2 | 211600 | 19 | 2.68 | 0.106 | 13.41 | 0.528 | 141.1 | 0.219 | 0.1996 | 0.0608 | 0.2050 | 0.0626 | 0.328 | 0.100 |
| 250 | 127 | - | 37 | 2.09 | 0.082 | 14.61 | 0.575 | 168 | 0.260 | 0.1687 | 0.0515 | 0.1753 | 0.0535 | 0.2778 | 0.0847 |
| 300 | 152 | - | 37 | 2.29 | 0.090 | 16.00 | 0.630 | 201 | 0.312 | 0.1409 | 0.0429 | 0.1463 | 0.0446 | 0.2318 | 0.0707 |
| 350 | 177 | - | 37 | 2.47 | 0.097 | 17.30 | 0.681 | 235 | 0.364 | 0.1205 | 0.0367 | 0.1252 | 0.0382 | 0.1984 | 0.0605 |
| 400 | 203 | - | 37 | 2.64 | 0.104 | 18.49 | 0.728 | 268 | 0.416 | 0.1053 | 0.0321 | 0.1084 | 0.0331 | 0.1737 | 0.0529 |
| 500 | 253 | - | 37 | 2.95 | 0.116 | 20.65 | 0.813 | 336 | 0.519 | 0.0845 | 0.0258 | 0.0869 | 0.0265 | 0.1391 | 0.0424 |
| 600 | 304 | - | 61 | 2.52 | 0.099 | 22.68 | 0.893 | 404 | 0.626 | 0.0704 | 0.0214 | 0.0732 | 0.0223 | 0.1159 | 0.0353 |
| 700 | 355 | - | 61 | 2.72 | 0.107 | 24.49 | 0.964 | 471 | 0.730 | 0.0603 | 0.0184 | 0.0622 | 0.0189 | 0.0994 | 0.0303 |
| 750 | 380 | - | 61 | 2.82 | 0.111 | 25.35 | 0.998 | 505 | 0.782 | 0.0563 | 0.0171 | 0.0579 | 0.0176 | 0.0927 | 0.0282 |
| 800 | 405 | - | 61 | 2.91 | 0.114 | 26.16 | 1.030 | 538 | 0.834 | 0.0528 | 0.0161 | 0.0544 | 0.0166 | 0.0868 | 0.0265 |
| 900 | 456 | - | 61 | 3.09 | 0.122 | 27.79 | 1.094 | 606 | 0.940 | 0.0470 | 0.0143 | 0.0481 | 0.0147 | 0.0770 | 0.0235 |
| 1000 | 507 | - | 61 | 3.25 | 0.128 | 29.26 | 1.152 | 673 | 1.042 | 0.0423 | 0.0129 | 0.0434 | 0.0132 | 0.0695 | 0.0212 |
| 1250 | 633 | - | 91 | 2.98 | 0.117 | 32.74 | 1.289 | 842 | 1.305 | 0.0338 | 0.0103 | 0.0347 | 0.0106 | 0.0554 | 0.0169 |
| 1500 | 760 | - | 91 | 3.26 | 0.128 | 35.86 | 1.412 | 1011 | 1.566 | 0.02814 | 0.00858 | 0.02814 | 0.00883 | 0.0464 | 0.0141 |
| 1750 | 887 | - | 127 | 2.98 | 0.117 | 38.76 | 1.526 | 1180 | 1.829 | 0.02410 | 0.00735 | 0.02410 | 0.00756 | 0.0397 | 0.0121 |
| 2000 | 1013 | - | 127 | 3.19 | 0.126 | 41.45 | 1.632 | 1349 | 2.092 | 0.02109 | 0.00643 | 0.02109 | 0.00662 | 0.0348 | 0.0106 |
Notes:
1. These resistance values are valid only for the parameters as given. Using conductors having coated strands, different stranding type, and, especially, other temperatures changes the resistance.
2. Equation for temperature change: R2 = R1 [1 + a (T2 - 75)], where αcu = 0.00323, αAL = 0.00330 at 75°C.
3. Conductors with compact and compressed stranding have smaller bare conductor diameters than those shown. See Table 5A for actual compact cable dimensions.
4. The IACS conductivities used: bare copper = 100%, aluminum = 61%.
5. Class B stranding is listed as well as solid for some sizes. Its overall diameter and area are those of its circumscribing circle.
Informational Note: NEMA WC/70-2009, Power Cables Rated 2000 Volts or Less for the Distribution of Electrical Energy, or ANSI/UL 1581-2017, Reference Standard for Electrical Wires, Cables, and Flexible Cords, is the source for the construction information.
National Bureau of Standards Handbook 100, dated 1966, and Handbook 109, dated 1972, is the reference where the resistance is calculated.
Table 9 Alternating-Current Resistance and Reactance for 600-Volt Cables, 3-Phase, 60 Hz, 75°C (167°F) - Three Single Conductors in Conduit.
| Size (AWG or kcmil) |
|
Size (AWG or kcmil) |
|||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| XL (Reactance) for All Wires | Alternating-Current Resistance for Uncoated Copper Wires |
Alternating-Current Resistance for Aluminum Wires |
Effective Z at 0.85 PF for Uncoated Copper Wires |
Effective Z at 0.85 PF for Aluminum Wires |
|||||||||||||
| PVC, Aluminum Conduits | Steel Conduit | PVC Conduit | Aluminum Conduit | Steel Conduit | PVC Conduit | Aluminum Conduit | Steel Conduit | PVC Conduit | Aluminum Conduit | Steel Conduit | PVC Conduit | Aluminum Conduit | Steel Conduit | ||||
| 14 | 0.190 | 0.240 | 10.2 | 10.2 | 10.2 | - | - | - | 8.9 | 8.9 | 8.9 | - | - | - | 14 | ||
| 0.058 | 0.073 | 3.1 | 3.1 | 3.1 | - | - | - | 2.7 | 2.7 | 2.7 | - | - | - | ||||
| 12 | 0.177 | 0.223 | 6.6 | 6.6 | 6.6 | 10.5 | 10.5 | 10.5 | 5.6 | 5.6 | 5.6 | 9.2 | 9.2 | 9.2 | 12 | ||
| 0.054 | 0.068 | 2.0 | 2.0 | 2.0 | 3.2 | 3.2 | 3.2 | 1.7 | 1.7 | 1.7 | 2.8 | 2.8 | 2.8 | ||||
| 10 | 0.164 | 0.207 | 3.9 | 3.9 | 3.9 | 6.6 | 6.6 | 6.6 | 3.6 | 3.6 | 3.6 | 5.9 | 5.9 | 5.9 | 10 | ||
| 0.050 | 0.063 | 1.2 | 1.2 | 1.2 | 2.0 | 2.0 | 2.0 | 1.1 | 1.1 | 1.1 | 1.8 | 1.8 | 1.8 | ||||
| 8 | 0.171 | 0.213 | 2.56 | 2.56 | 2.56 | 4.3 | 4.3 | 4.3 | 2.26 | 2.26 | 2.30 | 3.6 | 3.6 | 3.6 | 8 | ||
| 0.052 | 0.065 | 0.78 | 0.78 | 0.78 | 1.3 | 1.3 | 1.3 | 0.69 | 0.69 | 0.70 | 1.1 | 1.1 | 1.1 | ||||
| 6 | 0.167 | 0.210 | 1.61 | 1.61 | 1.61 | 2.66 | 2.66 | 2.66 | 1.44 | 1.48 | 1.48 | 2.33 | 2.36 | 2.36 | 6 | ||
| 0.051 | 0.064 | 0.49 | 0.49 | 0.49 | 0.81 | 0.81 | 0.81 | 0.44 | 0.45 | 0.45 | 0.71 | 0.72 | 0.72 | ||||
| 4 | 0.157 | 0.197 | 1.02 | 1.02 | 1.02 | 1.67 | 1.67 | 1.67 | 0.95 | 0.95 | 0.98 | 1.51 | 1.51 | 1.51 | 4 | ||
| 0.048 | 0.060 | 0.31 | 0.31 | 0.31 | 0.51 | 0.51 | 0.51 | 0.29 | 0.29 | 0.30 | 0.46 | 0.46 | 0.46 | ||||
| 3 | 0.154 | 0.194 | 0.82 | 0.82 | 0.82 | 1.31 | 1.35 | 1.31 | 0.75 | 0.79 | 0.79 | 1.21 | 1.21 | 1.21 | 3 | ||
| 0.047 | 0.059 | 0.25 | 0.25 | 0.25 | 0.40 | 0.41 | 0.40 | 0.23 | 0.24 | 0.24 | 0.37 | 0.37 | 0.37 | ||||
| 2 | 0.148 | 0.187 | 0.62 | 0.66 | 0.66 | 1.05 | 1.05 | 1.05 | 0.62 | 0.62 | 0.66 | 0.98 | 0.98 | 0.98 | 2 | ||
| 0.045 | 0.057 | 0.19 | 0.20 | 0.20 | 0.32 | 0.32 | 0.32 | 0.19 | 0.19 | 0.20 | 0.30 | 0.30 | 0.30 | ||||
| 1 | 0.151 | 0.187 | 0.49 | 0.52 | 0.52 | 0.82 | 0.85 | 0.82 | 0.52 | 0.52 | 0.52 | 0.79 | 0.79 | 0.82 | 1 | ||
| 0.046 | 0.057 | 0.15 | 0.16 | 0.16 | 0.25 | 0.26 | 0.25 | 0.16 | 0.16 | 0.16 | 0.24 | 0.24 | 0.25 | ||||
| 1/0 | 0.144 | 0.180 | 0.39 | 0.43 | 0.39 | 0.66 | 0.69 | 0.66 | 0.43 | 0.43 | 0.43 | 0.62 | 0.66 | 0.66 | 1/0 | ||
| 0.044 | 0.055 | 0.12 | 0.13 | 0.12 | 0.20 | 0.21 | 0.20 | 0.13 | 0.13 | 0.13 | 0.19 | 0.20 | 0.20 | ||||
| 2/0 | 0.141 | 0.177 | 0.33 | 0.33 | 0.33 | 0.52 | 0.52 | 0.52 | 0.36 | 0.36 | 0.36 | 0.52 | 0.52 | 0.52 | 2/0 | ||
| 0.043 | 0.054 | 0.10 | 0.10 | 0.10 | 0.16 | 0.16 | 0.16 | 0.11 | 0.11 | 0.11 | 0.16 | 0.16 | 0.16 | ||||
| 3/0 | 0.138 | 0.171 | 0.253 | 0.269 | 0.259 | 0.43 | 0.43 | 0.43 | 0.289 | 0.302 | 0.308 | 0.43 | 0.43 | 0.46 | 3/0 | ||
| 0.042 | 0.052 | 0.077 | 0.082 | 0.079 | 0.13 | 0.13 | 0.13 | 0.088 | 0.092 | 0.094 | 0.13 | 0.13 | 0.14 | ||||
| 4/0 | 0.135 | 0.167 | 0.203 | 0.220 | 0.207 | 0.33 | 0.36 | 0.33 | 0.243 | 0.256 | 0.262 | 0.36 | 0.36 | 0.36 | 4/0 | ||
| 0.041 | 0.051 | 0.062 | 0.067 | 0.063 | 0.10 | 0.11 | 0.10 | 0.074 | 0.078 | 0.080 | 0.11 | 0.11 | 0.11 | ||||
| 250 | 0.135 | 0.171 | 0.171 | 0.187 | 0.177 | 0.279 | 0.295 | 0.282 | 0.217 | 0.230 | 0.240 | 0.308 | 0.322 | 0.33 | 250 | ||
| 0.041 | 0.052 | 0.052 | 0.057 | 0.054 | 0.085 | 0.090 | 0.086 | 0.066 | 0.070 | 0.073 | 0.094 | 0.098 | 0.10 | ||||
| 300 | 0.135 | 0.167 | 0.144 | 0.161 | 0.148 | 0.233 | 0.249 | 0.236 | 0.194 | 0.207 | 0.213 | 0.269 | 0.282 | 0.289 | 300 | ||
| 0.041 | 0.051 | 0.044 | 0.049 | 0.045 | 0.071 | 0.076 | 0.072 | 0.059 | 0.063 | 0.065 | 0.082 | 0.086 | 0.088 | ||||
| 350 | 0.131 | 0.164 | 0.125 | 0.141 | 0.128 | 0.200 | 0.217 | 0.207 | 0.174 | 0.190 | 0.197 | 0.240 | 0.253 | 0.262 | 350 | ||
| 0.040 | 0.050 | 0.038 | 0.043 | 0.039 | 0.061 | 0.066 | 0.063 | 0.053 | 0.058 | 0.060 | 0.073 | 0.077 | 0.080 | ||||
| 400 | 0.131 | 0.161 | 0.108 | 0.125 | 0.115 | 0.177 | 0.194 | 0.180 | 0.161 | 0.174 | 0.184 | 0.217 | 0.233 | 0.240 | 400 | ||
| 0.040 | 0.049 | 0.033 | 0.038 | 0.035 | 0.054 | 0.059 | 0.055 | 0.049 | 0.053 | 0.056 | 0.066 | 0.071 | 0.073 | ||||
| 500 | 0.128 | 0.157 | 0.089 | 0.105 | 0.095 | 0.141 | 0.157 | 0.148 | 0.141 | 0.157 | 0.164 | 0.187 | 0.200 | 0.210 | 500 | ||
| 0.039 | 0.048 | 0.027 | 0.032 | 0.029 | 0.043 | 0.048 | 0.045 | 0.043 | 0.048 | 0.050 | 0.057 | 0.061 | 0.064 | ||||
| 600 | 0.128 | 0.157 | 0.075 | 0.092 | 0.082 | 0.118 | 0.135 | 0.125 | 0.131 | 0.144 | 0.154 | 0.167 | 0.180 | 0.190 | 600 | ||
| 0.039 | 0.048 | 0.023 | 0.028 | 0.025 | 0.036 | 0.041 | 0.038 | 0.040 | 0.044 | 0.047 | 0.051 | 0.055 | 0.058 | ||||
| 750 | 0.125 | 0.157 | 0.062 | 0.079 | 0.069 | 0.095 | 0.112 | 0.102 | 0.118 | 0.131 | 0.141 | 0.148 | 0.161 | 0.171 | 750 | ||
| 0.038 | 0.048 | 0.019 | 0.024 | 0.021 | 0.029 | 0.034 | 0.031 | 0.036 | 0.040 | 0.043 | 0.045 | 0.049 | 0.052 | ||||
| 1000 | 0.121 | 0.151 | 0.049 | 0.062 | 0.059 | 0.075 | 0.089 | 0.082 | 0.105 | 0.118 | 0.131 | 0.128 | 0.138 | 0.151 | 1000 | ||
| 0.037 | 0.046 | 0.015 | 0.019 | 0.018 | 0.023 | 0.027 | 0.025 | 0.032 | 0.036 | 0.040 | 0.039 | 0.042 | 0.046 | ||||
Notes:
1. These values are based on the following constants: UL-Type RHH wires with Class B stranding, in cradled configuration. Wire conductivities are 100 percent IACS copper and 61 percent IACS aluminum, and aluminum conduit is 45 percent IACS. Capacitive reactance is ignored, since it is negligible at these voltages. These resistance values are valid only at 75°C (167°F) and for the parameters as given, but are representative for 600-volt wire types operating at 60 Hz.
2. Effective Z is defined as R cos(θ) + X sin(θ), where θ is the power factor angle of the circuit. Multiplying current by effective impedance gives a good approximation for line-to-neutral voltage drop. Effective impedance values shown in this table are valid only at 0.85 power factor. For another circuit power factor (PF), effective impedance (Ze) can be calculated from R and XL values given in this table as follows: Ze = R × PF + XL sin[arccos (PF)].
Table 10 Conductor Stranding.
| Conductor Size | Number of Strands | |||
|---|---|---|---|---|
| Copper | Aluminum | |||
| AWG or kcmil | mm2 | Class Ba | Class C | Class Ba |
| 24—30 | 0.20—0.05 | b | - | - |
| 22 | 0.32 | 7 | - | - |
| 20 | 0.52 | 10 | - | - |
| 18 | 0.82 | 16 | - | - |
| 16 | 1.3 | 26 | - | - |
| 14—2 | 2.1—33.6 | 7 | 19 | 7c |
| 1—4/0 | 42.4—107 | 19 | 37 | 19 |
| 250—500 | 127—253 | 37 | 61 | 37 |
| 600—1000 | 304—508 | 61 | 91 | 61 |
| 1250—1500 | 635—759 | 91 | 127 | 91 |
| 1750—2000 | 886—1016 | 127 | 271 | 127 |
aConductors with a lesser number of strands shall be permitted based on an evaluation for connectability and bending.
bNumber of strands vary.
cAluminum 14 AWG (2.1 mm2) is not available.
With the permission of Underwriters Laboratories, Inc., material is reproduced from UL Standard 486A-486B, Wire Connectors, which is copyrighted by Underwriters Laboratories, Inc., Northbrook, Illinois. While use of this material has been authorized, UL shall not be responsible for the manner in which the information is presented, nor for any interpretations thereof. For more information on UL or to purchase standards, please visit our Standards website at www.comm-2000.com or call 1-888-853-3503.
Table 11 (A) and Table 11 (B).
For listing purposes, Table 11(A) and Table 11(B) provide the required power source limitations for Class 2 and Class 3 power sources. Table 11(A) applies for alternating-current sources, and Table 11(B) applies for direct-current sources.
The power for Class 2 and Class 3 circuits shall be either (1) inherently limited, requiring no overcurrent protection, or (2) not inherently limited, requiring a combination of power source and overcurrent protection. Power sources designed for interconnection shall be listed for the purpose.
As part of the listing, the Class 2 or Class 3 power source shall be durably marked where plainly visible to indicate the class of supply and its electrical rating. A Class 2 power source not suitable for wet location use shall be so marked.
Exception: Limited power circuits used by listed information technology equipment.
Overcurrent devices, where required, shall be located at the point where the conductor to be protected receives its supply and shall not be interchangeable with devices of higher ratings. The overcurrent device shall be permitted as an integral part of the power source.
Table 11 (A) Class 2 and Class 3 Alternating-Current Power Source Limitations.
| Power Source | Inherently Limited Power Source (Overcurrent Protection Not Required) |
Not Inherently Limited Power Source (Overcurrent Protection Required) |
|||||||
|---|---|---|---|---|---|---|---|---|---|
| Class 2 | Class 3 | Class 2 | Class 3 | ||||||
| Source voltage Vmax (Volts) (see Note 1) |
0 through 20* | Over 20 and through 30* | Over 30 and through 150 | Over 30 and through 100 | 0 through 20* | Over 20 and through 30* | Over 30 and through 100 | Over 100 and through 150 | |
| Power limitations VAmax (volt-amperes) (see Note 1) |
- | - | - | - | 250 (see Note 3) | 250 | 250 | N.A. | |
| Current limitations Imax (amperes) (see Note 1) |
8.0 | 8.0 | 0.005 | 150/Vmax | 1000/Vmax | 1000/Vmax | 1000/Vmax | 1.0 | |
| Maximum overcurrent protection (amperes) | - | - | - | - | 5.0 | 100/Vmax | 100/Vmax | 1.0 | |
| Power source maximum nameplate rating | VA (volt-amperes) | 5.0 × Vmax | 100 | 0.005 × Vmax | 100 | 5.0 × Vmax | 100 | 100 | 100 |
| Current (amperes) | 5.0 | 100/Vmax | 0.005 | 100/Vmax | 5.0 | 100/Vmax | 100/Vmax | 100/Vmax | |
- Note: Notes for this table can be found following Table 11(B).
- *Voltage ranges shown are for sinusoidal ac in indoor locations or where wet contact is not likely to occur.
- For nonsinusoidal or wet contact conditions, see Note 2.
Table 11 (B) Class 2 and Class 3 Direct-Current Power Source Limitations.
| Power Source | Inherently Limited Power Source (Overcurrent Protection Not Required) |
Not Inherently Limited Power Source (Overcurrent Protection Required) |
||||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Class 2 | Class 3 | Class 2 | Class 3 | |||||||
| Source voltage Vmax (volts) (see Note 1) |
0 through 20* | Over 20 and through 30* | Over 30 and through 60* | Over 60 and through 150 | Over 60 and through 100 | 0 through 20* | Over 20 and through 60* | Over 60 and through 100 | Over 100 and through 150 | |
| Power limitations VAmax (volt-amperes) (see Note 1) |
- | - | - | - | - | 250 (see Note 3) | 250 | 250 | N.A. | |
| Current limitations Imax (amperes) (see Note 1) |
8.0 | 8.0 | 150/Vmax | 0.005 | 150/Vmax | 1000/Vmax | 1000/Vmax | 1000/Vmax | 1.0 | |
| Maximum overcurrent protection (amperes) | - | - | - | - | - | 5.0 | 100/Vmax | 100/Vmax | 1.0 | |
| Power source maximum nameplate rating | VA (volt-amperes) | 5.0 × Vmax | 100 | 100 | 0.005 × Vmax | 100 | 5.0 × Vmax | 100 | 100 | 100 |
| Current (amperes) | 5.0 | 100/Vmax | 0.005 | 100/Vmax | 5.0 | 100/Vmax | 100/Vmax | 100/Vmax | ||
*Voltage ranges shown are for continuous dc in indoor locations or where wet contact is not likely to occur.
For interrupted dc or wet contact conditions, see Note 4.
Notes for Table 11(A) and Table 11(B).
1. Vmax, Imax, and VAmax are determined with the current-limiting impedance in the circuit (not bypassed) as follows:
Vmax: Maximum output voltage regardless of load with rated input applied.
Imax: Maximum output current under any noncapacitive load, including short circuit, and with overcurrent protection bypassed if used. Where a transformer limits the output current, Imax limits apply after 1 minute of operation. Where a current-limiting impedance, listed for the purpose, or as part of a listed product, is used in combination with a non-power-limited transformer or a stored energy source, e.g., storage battery, to limit the output current, Imax limits apply after 5 seconds.
VAmax: Maximum volt-ampere output after 1 minute of operation regardless of load and overcurrent protection bypassed if used.
2. For nonsinusoidal ac, Vmax shall not be greater than 42.4 volts peak. Where wet contact (immersion not included) is likely to occur, Class 3 wiring methods shall be used or Vmax shall not be greater than 15 volts for sinusoidal ac and 21.2 volts peak for nonsinusoidal ac.
3. If the power source is a transformer, VAmax is 350 or less when Vmax is 15 or less.
4. For dc interrupted at a rate of 10 to 200 Hz, Vmax shall not be greater than 24.8 volts peak. Where wet contact (immersion not included) is likely to occur, Class 3 wiring methods shall be used, or Vmax shall not be greater than 30 volts for continuous dc; 12.4 volts peak for dc that is interrupted at a rate of 10 to 200 Hz.
Table 12(A) and Table 12(B).
For listing purposes, Table 12(A) and Table 12(B) provide the required power source limitations for power-limited fire alarm sources. Table 12(A) applies for alternating-current sources, and Table 12(B) applies for direct-current sources. The power for power-limited fire alarm circuits shall be either (1) inherently limited, requiring no overcurrent protection, or (2) not inherently limited, requiring the power to be limited by a combination of power source and overcurrent protection.
As part of the listing, the PLFA power source shall be durably marked where plainly visible to indicate that it is a power- limited fire alarm power source. The overcurrent device, where required, shall be located at the point where the conductor to be protected receives its supply and shall not be interchangeable with devices of higher ratings. The overcurrent device shall be permitted as an integral part of the power source.
Table 12(A) PLFA Alternating-Current Power Source Limitations.
| Power Source | Inherently Limited Power Source (Overcurrent Protection Not Required) |
Not Inherently Limited Power Source (Overcurrent Protection Required) |
|||||
|---|---|---|---|---|---|---|---|
| Circuit voltage Vmax (volts) (see Note 1) |
0 through 20 | Over 20 and through 30 | Over 30 and through 100 | 0 through 20 | Over 20 and through 100 | Over 100 and through 150 | |
| Power limitations VAmax (volt-amperes) (see Note 1) |
- | - | - | 250 (see Note 2) | 250 | N.A. | |
| Current limitations Imax (amperes) (see Note 1) |
8.0 | 8.0 | 150/Vmax | 1000/Vmax | 1000/Vmax | 1.0 | |
| Maximum overcurrent protection (amperes) | - | - | - | 5.0 | 100/Vmax | 1.0 | |
| Power source maximum nameplate ratings | VA (volt-amperes) | 5.0 × Vmax | 100 | 100 | 5.0 × Vmax | 100 | 100 |
| Current (amperes) | 5.0 | 100/Vmax | 100/Vmax | 5.0 | 100/Vmax | 100/Vmax | |
Note: Notes for this table can be found following Table 12(B).
Table 12(B) PLFA Direct-Current Power Source Limitations.
| Power Source | Inherently Limited Power Source (Overcurrent Protection Not Required) | Not Inherently Limited Power Source (Overcurrent Protection Required) | |||||
|---|---|---|---|---|---|---|---|
| Circuit voltage Vmax (volts) (see Note 1) | 0 through 20 | Over 20 and through 30 | Over 30 and through 100 | 0 through 20 | Over 20 and through 100 | Over 100 and through 150 | |
| Power limitations VAmax (volt-amperes) (see Note 1) | - | - | - | 250 (see Note 2) | 250 | N.A. | |
| Current limitations Imax (amperes) (see Note 1) | 8.0 | 8.0 | 150/Vmax | 1000/Vmax | 1000/Vmax | 1.0 | |
| Maximum overcurrent protection (amperes) | - | - | - | 5.0 | 100/Vmax | 1.0 | |
| Power source maximum nameplate ratings | VA (volt-amperes) | 5.0 × Vmax | 100 | 100 | 5.0 × Vmax | 100 | 100 |
| Current (amperes) | 5.0 | 100/Vmax | 100/Vmax | 5.0 | 100/Vmax | 100/Vmax | |
Notes for Table 12(A) and Table 12(B).
1. Vmax, Imax, and VAmax are determined as follows:
Vmax: Maximum output voltage regardless of load with rated input applied.
Imax: Maximum output current under any noncapacitive load, including short circuit, and with overcurrent protection bypassed if used. Where a transformer limits the output current, Imax limits apply after 1 minute of operation. Where a current-limiting impedance, listed for the purpose, is used in combination with a non—power-limited transformer or a stored energy source, e.g., storage battery, to limit the output current, Imax limits apply after 5 seconds.
VAmax: Maximum volt-ampere output after 1 minute of operation regardless of load and overcurrent protection bypassed if used. Current limiting impedance shall not be bypassed when determining Imax and VAmax.
2. If the power source is a transformer, VAmax is 350 or less when Vmax is 15 or less.
Table 13 Equipment Suitable for Hazardous (Classified) Locations.
| Area Classification | Type (Level) of Protection | |
|---|---|---|
| Zone 0 | Intrinsically safe | Intrinsically safe for Class I, Division 1 |
| Intrinsic safety (Group II) | ia | |
| Encapsulation (Group II) | ma | |
| Flameproof (Group II) | da1 | |
| Inherently safe optical radiation | op is, with EPL Ga2 | |
| Optical system with interlock | op sh, with EPL Ga2 | |
| Special protection (Group II) | sa | |
| EPL3 | Ga | |
| Zone 1 | Equipment suitable for use in Zone 0 | |
| Equipment suitable for use in Class I, Division 1 | ||
| Flameproof (Group II) | d, db | |
| Intrinsic safety (Group II) | ib | |
| Increased safety (Group II) | e, eb | |
| Pressurized enclosure (Group II) | p, px, pxb, py, pyb | |
| Encapsulation (Group II) | m, mb | |
| Pressurized room (Group II) | pb | |
| Powder filling (Group II) | q, qb | |
| Liquid immersion (Group II) | o, ob | |
| Electrical resistance trace heating | 60079-30-1, with EPL Gb2 | |
| Skin effect trace heating | IEEE 844.1, with EPL Gb2 | |
| Inherently safe optical radiation | op is, with EPL Gb2 | |
| Optical system with interlock | op sh, with EPL Gb2 | |
| Protected optical radiation | op pr, with EPL Gb2 | |
| Special protection (Group II) | sb | |
| EPL3 | Gb | |
| Zone 2 | Equipment suitable for use in Zone 0 | |
| Equipment suitable for use in Zone 1 | ||
| Equipment suitable for use in Class I, Division 1 | ||
| Equipment suitable for use in Class I, Division 2 | ||
| Type of protection "n" (Group II) | nA, nC, nL, nR | |
| Pressurized enclosure (Group II) | pz, pzc | |
| Intrinsic safety (Group II) | ic | |
| Flameproof (Group II) | dc | |
| Increased safety (Group II) | ec | |
| Liquid immersion (Group II) | oc | |
| Encapsulation (Group II) | mc | |
| Pressurized room (Group II) | pc | |
| Electrical resistance trace heating | 60079-30-1, with EPL Gc2 | |
| Skin effect trace heating | IEEE 844.1, with EPL Gc2 | |
| Impedance heating | IEEE 844.3, with EPL Gc2 | |
| Inherently safe optical radiation | op is, with EPL Gc2 | |
| Optical system with interlock | op sh, with EPL Gc2 | |
| Protected optical radiation | op pr, with EPL Gc2 | |
| Special protection (Group II) | sc | |
| EPL3 | Gc | |
| Other electrical apparatus4 | ||
| Unclassified | Associated apparatus for Zone 0 (Group II) | [ia] |
| Associated apparatus for Zone 1 (Group II) | [ib] | |
| Associated apparatus for Zone 2 (Group II) | [ic] | |
| Associated pressurization equipment (Group II) | [p] | |
| Associated optical radiation equipment (Group II) | [op is] | |
| Associated optical radiation equipment (Group II) | [op sh] | |
| Zone 20 | Equipment suitable for use in Class II, Division 1 | |
| Intrinsic safety (Group III) | ia | |
| Intrinsically safe | Intrinsically safe for Class II Division 1 | |
| Protection by enclosure (Group III) | ta | |
| Encapsulation (Group III) | ma | |
| Inherently safe optical radiation | op is, with EPL Da2 | |
| Optical system with interlock | op sh, with EPL Da2 | |
| Special protection (Group III) | sa | |
| EPL3 | Da | |
| Group IIIA Only | Equipment suitable for use in Class III, Division 1 | |
| Zone 21 | Equipment suitable for use in Zone 20 | |
| Equipment suitable for use in Class II, Division 1 | ||
| Intrinsic safety (Group III) | ib | |
| Protection by enclosure (Group III) | tb | |
| Pressurized enclosure (Group III) | p, px, pxb, py, pyb | |
| Encapsulation (Group III) | mb | |
| Pressurized room (Group III) | pb | |
| Electrical resistance trace heating | 60079-30-1, with EPL Db2 | |
| Skin effect trace heating | IEEE 844.1, with EPL Db2 | |
| Impedance heating | IEEE 844.3, with EPL Db2 | |
| Inherently safe optical radiation | op is, with EPL Db2 | |
| Optical system with interlock | op sh, with EPL Db2 | |
| Protected optical radiation | op pr, with EPL Db2 | |
| Special protection (Group III) | sb | |
| EPL3 | Db | |
| Group IIIA Only | Equipment suitable for use in Class III, Division 1 | |
| Zone 22 | Equipment suitable for use in Zone 20 | |
| Equipment suitable for use in Zone 21 | ||
| Equipment suitable for use in Class II, Division 1 | ||
| Equipment suitable for use in Class II, Division 2 | ||
| Intrinsic safety (Group III) | ic | |
| Protection by enclosure (Group III) | tc | |
| Pressurized enclosure (Group III) | pz, pzc | |
| Encapsulation (Group III) | mc | |
| Pressurized room (Group III) | pc | |
| Electrical resistance trace heating | 60079-30-1, with EPL Dc2 | |
| Skin effect trace heating | IEEE 844.1, with EPL Dc2 | |
| Impedance heating | IEEE 844.3, with EPL Dc2 | |
| Inherently safe optical radiation | op is, with EPL Dc2 | |
| Optical system with interlock | op sh, with EPL Dc2 | |
| Protected optical radiation | op pr, with EPL Dc2 | |
| Type 22 vacuum cleaners and dust collectors | 62784 | |
| Special protection (Group III) | SC | |
| EPL3 | Dc | |
| Other electrical apparatus4 | ||
| Group IIIA Only | Equipment suitable for use in Class III, Division 2 | |
| Unclassified | Associated apparatus for Zone 20 (Group III) | [ia] |
| Associated apparatus for Zone 21 (Group III) | [ib] | |
| Associated apparatus for Zone 22 (Group III) | [ic] | |
| Associated pressurization equipment (Group III) | [p] | |
| Associated optical radiation equipment (Group III) | [op is] | |
| Associated optical radiation equipment (Group III) | [op sh] | |
| Class I, Division 1 | Equipment marked for use in Class I, Division 15 | |
| Intrinsically safe | Intrinsically safe for Class I | |
| Pressurized enclosure | Type X, for Class I | |
| Pressurized enclosure | Type Y, for Class I | |
| Equipment suitable for use in Zone 0 | ||
| Intrinsic safety (Group II) | ia | |
| Encapsulation (Group II) | ma | |
| Inherently safe optical radiation | op is, with EPL Ga2 | |
| Optical system with interlock | op sh, with EPL Ga2 | |
| Special protection (Group II) | sa | |
| Class I, Division 2 | Equipment suitable for use in Class I, Division 1 | |
| Equipment marked for use in Class I, Division 25 | ||
| Pressurized enclosure | Type Z, for Class I | |
| Equipment suitable for use in Zone 0, Zone 1 or Zone 2 | ||
| Type of protection "n" (Group II) | nA, nC, nL, nR | |
| Pressurized enclosure (Group II) | px, pxb, py, pyb, pz, pzc | |
| Intrinsic safety (Group II) | ia, ib, ic | |
| Flameproof (Group II) | da, db, dc | |
| Increased safety (Group II) | eb, ec | |
| Liquid immersion (Group II) | ob, oc | |
| Encapsulation (Group II) | ma, mb, mc | |
| Pressurized room (Group II) | pb | |
| Pressurized room (Group II) | pc | |
| Electrical resistance trace heating | 60079-30-1, with EPL Gb or Gc2 | |
| Skin effect trace heating | IEEE 844.1, with EPL Gb or Gc2 | |
| Impedance heating | IEEE 844.3, with EPL Gb or Gc2 | |
| Inherently safe optical radiation | op is, with EPL Ga, Gb or Gc2 | |
| Optical system with interlock | op sh, with EPL Ga, Gb or Gc2 | |
| Protected optical radiation | op pr, with EPL Gb or Gc2 | |
| Special protection (Group II) | sa, sb, sc | |
| Other electrical apparatus4 | ||
| Unclassified | Associated apparatus for Class I, Division 1 | |
| Class II, Division 16 | Equipment marked for use in Class II, Division 15 | |
| Intrinsically safe | Intrinsically safe for Class II | |
| Pressurized enclosure | Type X, for Class II | |
| Pressurized enclosure | Type Y, for Class II | |
| Equipment suitable for use in Zone 20 | ||
| Intrinsic safety (Group III) | ia | |
| Protection by enclosure (Group III) | ta | |
| Encapsulation (Group III) | ma | |
| Inherently safe optical radiation | op is, with EPL Da22 | |
| Optical system with interlock | op sh, with EPL Da2 | |
| Special protection (Group III) | sa | |
| Class II, Division 26 | Equipment suitable for use in Class II, Division 1 | |
| Equipment marked for use in Class II, Division 25 | ||
| Pressurized enclosure | Type Z, for Class II | |
| Equipment suitable for use in Zone 20, Zone 21 or Zone 22 | ||
| Intrinsic safety (Group III) | ia, ib, ic | |
| Protection by enclosure (Group III) | ta, tb, tc | |
| Pressurized enclosure (Group III) | px, pxb, py, pyb, pz, pzc | |
| Encapsulation (Group III) | ma, mb, mc | |
| Pressurized room (Group III) | pb | |
| Pressurized room (Group III) | pc | |
| Electrical resistance trace heating | 60079-30-1, with EPL Db or Dc2 | |
| Skin effect trace heating | IEEE 844.1, with EPL Db or Dc2 | |
| Impedance heating | IEEE 844.3, with EPL Db or Dc2 | |
| Inherently safe optical radiation | op is, with EPL Da, Db or Dc2 | |
| Optical system with interlock | op sh, with EPL Da, Db or Dc2 | |
| Protected optical radiation | op pr, with EPL Db or Dc2 | |
| Special protection (Group III) | sa, sb, sc | |
| Other electrical apparatus4 | ||
| Unclassified | Associated apparatus for Class II, Division 1 | |
| Class III, Division 1 | Equipment suitable for use in Class II, Division 1 | |
| Equipment marked for use in Class III, Division 15,7 | ||
| Intrinsically safe | Intrinsically safe for Class II or Class III | |
| Equipment suitable for use in Zone 20 or Zone 21 | ||
| Intrinsic safety (Group III) | ia. ib | |
| Protection by enclosure (Group III) | ta. tb | |
| Encapsulation (Group III) | ma, mb | |
| Inherently safe optical radiation | op is, with EPL Da or Db2 | |
| Optical system with interlock | op sh, with EPL Da or Db2 | |
| Special protection (Group III) | sa | |
| Class III, Division 2 | Equipment suitable for use in Class II, Division 1 | |
| Equipment suitable for use in Class II, Division 2 | ||
| Equipment suitable for use in Class III, Division 1 | ||
| Equipment marked for use in Class III, Division 25 | ||
| Intrinsically safe | Intrinsically safe for Class II or Class III | |
| Equipment suitable for use in Zone 20, Zone 21 or Zone 22 | ||
| Intrinsic safety (Group III) | ia, ib, ic | |
| Protection by enclosure (Group III) | ta, tb, tc | |
| Pressurized enclosure (Group III) | px, pxb, py, pyb, pz, pzc | |
| Encapsulation (Group III) | ma, mb, mc | |
| Electrical resistance trace heating | 60079-30-1, with EPL Db or Dc2 | |
| Skin effect trace heating | IEEE 844.1, with EPL Db or Dc2 | |
| Impedance heating | IEEE 844.3, with EPL Db or Dc2 | |
| Inherently safe optical radiation | op is, with EPL Da, Db or Dc2 | |
| Optical system with interlock | op sh, with EPL Da, Db or Dc2 | |
| Protected optical radiation | op pr, with EPL Db or Dc2 | |
| Special protection (Group III) | sa, sb, sc | |
| Other electrical apparatus4 | ||
| Unclassified | Associated apparatus for Class III, Division 1 | |
Note: This table is structured to show the area classification on the left side and the permitted equipment on the right side. Zone equipment is suitable for use in some class/division locations and vice versa. This is indicated by the phrase "Equipment suitable for use in...", for example, in Class I, Division 1 locations, "Equipment suitable for use in Zone 0" means all equipment listed under Zone 0 can be used with an appropriate equipment group and temperature class.
1"da" is limited to sensors of portable combustible gas detectors.
2Equipment marked with these types of protection is available in multiple levels of protection not specifically identified within the Ex marking.
3The EPL takes precedence over the type of protection, for example "AEx ia _ _ Gb" is suitable for Zone 1, not Zone 0; "AEx op is _ _ Db" is suitable for Zone 21, not Zone 20; and "AEx 60079-30-1 _ _ Gc" is suitable for Zone 2, not Zone 1. Selection according to the mark EPL is critical to the safe application of this equipment.
4"Other electrical apparatus" indicates electrical apparatus complying with the requirements of a recognized standard for industrial electrical apparatus that does not in normal service (a) have ignition-capable hot surfaces, or (b) produce incendive arcs or sparks. [See 501.105(B), 501.115(B), 501.125(B), 502.100(B), 502.115(B), 502.125(B), or 502.130(B).] "Other electrical apparatus" also includes equipment or systems currently acceptable as alternative means of protection (see 500.7).
5With the exception of intrinsically safe or purged/pressurized equipment, equipment for use in a Class XX, Division XX, location is not required to be marked with a type of protection, only the location where that equipment is permitted to be installed.
6For use in Class II and Class III locations, such (zone-acceptable) equipment is subject to the requirements of 502.6 or 503.6, respectively. Group IIIA equipment is not suitable for use in Class II locations.
7In Class III, Division 1 locations, switches, controllers, circuit breakers, fuses, control transformers, resistors, utilization equipment (fixed and portable), electric cranes, hoists, and similar equipment can be housed in dusttight enclosures.