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---
aliases:
- nec-ch9
- NEC Chapter 9 Tables
title: Chapter 9 Tables
tags:
- authorship/other
@@ -83,12 +84,216 @@ tags:
## Table 8 Conductor Properties
| | | | | | | | | | | | | | | | |
| ------------------- | ----- | ------------- | ---------- | -------- | ----- | -------- | ----- | ----- | ----- | ----------------------------------------- | ------- | ------- | ------- | -------- | ------- |
| Size (AWG or kcmil) | Area | < | Conductors | < | < | < | < | < | < | Direct-Current Resistance at 75°C (167°F) | < | < | < | < | < |
| ^ | mm2 | Circular mils | Stranding | < | < | Overall | < | < | < | Copper | < | < | < | < | < |
| ^ | ^ | ^ | Quantity | Diameter | < | Diameter | < | Area | < | Uncoated | < | Coated | < | Aluminum | < |
| ^ | ^ | ^ | | mm | in. | mm | in. | mm2 | in | ohm/km | ohm/kFT | ohm/km | ohm/kFT | ohm/km | ohm/kFT |
| 18 | 0.823 | 1620 | 1 | — | — | 1.02 | 0.04 | 0.823 | 0.001 | 25.5 | 7.77 | 26.5 | 8.08 | 42 | 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 | 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 | 0.03 | 2.32 | 0.092 | 4.25 | 0.006 | 6.5 | 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 |
| 10 | 5.261 | 10380 | 7 | 0.98 | 0.038 | 2.95 | 0.116 | 6.76 | 0.011 | 4.07 | 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 | 13.3 | 26240 | 7 | 1.56 | 0.061 | 4.67 | 0.184 | 17.09 | 0.027 | 1.608 | 0.491 | 1.671 | 0.51 | 2.652 | 0.808 |
| 4 | 21.15 | 41740 | 7 | 1.96 | 0.077 | 5.89 | 0.232 | 27.19 | 0.042 | 1.01 | 0.308 | 1.053 | 0.321 | 1.666 | 0.508 |
| 3 | 26.67 | 52620 | 7 | 2.2 | 0.087 | 6.6 | 0.26 | 34.28 | 0.053 | 0.802 | 0.245 | 0.833 | 0.254 | 1.32 | 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 | 55.8 | 0.087 | 0.505 | 0.154 | 0.524 | 0.16 | 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 | 0.66 | 0.201 |
| 2/0 | 67.43 | 133100 | 19 | 2.13 | 0.084 | 10.62 | 0.418 | 88.74 | 0.137 | 0.317 | 0.0967 | 0.329 | 0.101 | 0.523 | 0.159 |
| 3/0 | 85.01 | 167800 | 19 | 2.39 | 0.094 | 11.94 | 0.47 | 111.9 | 0.173 | 0.2512 | 0.0766 | 0.261 | 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 | 0.205 | 0.0626 | 0.328 | 0.1 |
| 250 | 127 | — | 37 | 2.09 | 0.082 | 14.61 | 0.575 | 168 | 0.26 | 0.1687 | 0.0515 | 0.1753 | 0.0535 | 0.2778 | 0.0847 |
| 300 | 152 | — | 37 | 2.29 | 0.09 | 16 | 0.63 | 201 | 0.312 | 0.1409 | 0.0429 | 0.1463 | 0.0446 | 0.2318 | 0.0707 |
| 350 | 177 | — | 37 | 2.47 | 0.097 | 17.3 | 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 | 0.73 | 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 | 1.03 | 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 | 0.94 | 0.047 | 0.0143 | 0.0481 | 0.0147 | 0.077 | 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 | 0.0241 | 0.00735 | 0.0241 | 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: $R_2 = R_1 [1 + \alpha (T_2—75)]$,
where $\alpha_{cu}$ = 0.00323, $\alpha_{AL}$ = 0.00330 at 75°C.
3. Conductors with compact and compressed stranding
have about 9 percent and 3 percent, respectively,
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.
> [!info] Informational Note:
> The construction information is in accordance
> with NEMA WC/70-2009 or ANSI/UL 1581-2017.
>
> The resistance is calculated in accordance
> with National Bureau of Standards Handbook 100, dated 1966,
> and Handbook 109, dated 1972.
## 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) | Ohms to Neutral per Kilometer | < | < | < | < | < | < | < | < | < | < | < | < | < | Size (AWG or kcmil) |
| ^ | Ohms to Neutral per 1000 Feet | < | < | < | < | < | < | < | < | < | < | < | < | < | ^ |
| ^ | 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 | 0.19 | 0.24 | 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 | 2 | 2 | 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 |
| ^ | 0.05 | 0.063 | 1.2 | 1.2 | 1.2 | 2 | 2 | 2 | 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 | 2.3 | 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 | 0.7 | 1.1 | 1.1 | 1.1 | ^ |
| 6 | 0.167 | 0.21 | 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 | 0.06 | 0.31 | 0.31 | 0.31 | 0.51 | 0.51 | 0.51 | 0.29 | 0.29 | 0.3 | 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 | 0.4 | 0.41 | 0.4 | 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 | 0.2 | 0.2 | 0.32 | 0.32 | 0.32 | 0.19 | 0.19 | 0.2 | 0.3 | 0.3 | 0.3 | ^ |
| 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 | 0.18 | 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 | 0.2 | 0.21 | 0.2 | 0.13 | 0.13 | 0.13 | 0.19 | 0.2 | 0.2 | ^ |
| 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 | 0.1 | 0.1 | 0.1 | 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 | 0.22 | 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 | 0.1 | 0.11 | 0.1 | 0.074 | 0.078 | 0.08 | 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 | 0.23 | 0.24 | 0.308 | 0.322 | 0.33 | 250 |
| ^ | 0.041 | 0.052 | 0.052 | 0.057 | 0.054 | 0.085 | 0.09 | 0.086 | 0.066 | 0.07 | 0.073 | 0.094 | 0.098 | 0.1 | ^ |
| 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 | 0.2 | 0.217 | 0.207 | 0.174 | 0.19 | 0.197 | 0.24 | 0.253 | 0.262 | 350 |
| ^ | 0.04 | 0.05 | 0.038 | 0.043 | 0.039 | 0.061 | 0.066 | 0.063 | 0.053 | 0.058 | 0.06 | 0.073 | 0.077 | 0.08 | ^ |
| 400 | 0.131 | 0.161 | 0.108 | 0.125 | 0.115 | 0.177 | 0.194 | 0.18 | 0.161 | 0.174 | 0.184 | 0.217 | 0.233 | 0.24 | 400 |
| ^ | 0.04 | 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 | 0.2 | 0.21 | 500 |
| ^ | 0.039 | 0.048 | 0.027 | 0.032 | 0.029 | 0.043 | 0.048 | 0.045 | 0.043 | 0.048 | 0.05 | 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 | 0.18 | 0.19 | 600 |
| ^ | 0.039 | 0.048 | 0.023 | 0.028 | 0.025 | 0.036 | 0.041 | 0.038 | 0.04 | 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 | 0.04 | 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 | 0.04 | 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 $R \cos(\theta) + X sin(\theta)$,
where $\theta$ 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 ($Z_{e}$) can be calculated
from $R$ and $X_{L}$ values given in this table as follows:
$Z_{e} = R \times \rm{PF} + X_{L} \sin[\arccos(\rm{PF})]$.
## Table 10 Conductor Stranding
| | | | | |
| -------------- | --------- | ------------------- | ------- | ------------------- |
| Conductor Size | < | Number of Strands | < | < |
| -------------- | --------- | ----------------- | ------- | -------- |
| AWG or kcmil | mm2 | Copper | < | Aluminum |
| ^ | ^ | Class B<sup>a</sup> | Class C | Class B<sup>a</sup> |
| 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 |
<sup>a</sup>Conductors with a lesser number of strands shall be permitted
based on an evaluation for connectability and bending.
<sup>b</sup>Number of strands vary.
<sup>c</sup>Aluminum 14 AWG (2.1 mm<sup>2</sup>) 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
### Table 11(B) Class 2 and Class 3 Direct-Current Power Source Limitations