---
aliases:
- nec-ch9
- NEC Chapter 9 Tables
title: Chapter 9 Tables
tags:
- authorship/other
- exclude-from-word-count
- topic/construction/electrical
- type/media/reference
---
# Chapter 9 Tables
## Notes to Tables
* **9.0(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.
* **9.0(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.
* **9.0(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.
* **9.0(4)** Where conduit or tubing nipples 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.
* **9.0(5)** For conductors not included in Chapter 9, such as multiconductor cables and optical fiber cables, the actual dimensions shall be used.
* **9.0(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.
* **9.0(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.
* **9.0(8)** Where bare conductors are permitted by other sections of this Code, the dimensions for bare conductors in Table 8 shall be permitted.
* **9.0(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.
* **9.0(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 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 |
> [!info] 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.
> [!info] 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.
## 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 | 4 1/2 | 127 | 5 |
| 27 | 1 | 146.05 | 5 3/4 | 152.4 | 6 |
| 35 | 11/4 | 184.15 | 7 1/4 | 203.2 | 8 |
| 41 | 11/2 | 209.55 | 8 1/4 | 254 | 10 |
| 53 | 2 | 241.3 | 9 1/2 | 304.8 | 12 |
| 63 | 21/2 | 266.7 | 10 1/2 | 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)
## Table 5 Dimensions of Insulated Conductors and Fixture Wires
## Table 5A Compact Copper and Aluminum Building Wire Nominal Dimensions** and Areas
## 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 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
### Table 11(B) Class 2 and Class 3 Direct-Current Power Source Limitations
## Table 12(A) and Table 12(B)
### Table 12(A) PLFA Alternating-Current Power Source Limitations
### Table 12(B) PLFA Direct-Current Power Source Limitations