30 C.F.R. § 18 app I to Subpart D of Part 18
LIST OF TABLES
| Table No. | Title |
| 1 | Portable power cable ampacities-600 volts. |
| 2 | Portable cord ampacities-600 volts. |
| 3 | Portable power cable ampacities-601 to 5,000 volts. |
| 4 | Normal diameter of round cables with tolerances in inches-600 volts. |
| 5 | Nominal dimension of flat cables with tolerances in inches-600 volts. |
| 6 | Nominal diameter of heavy jacketed cords with tolerances in inches-600 volts. |
| 7 | Nominal diameter of three-conductor portable power cables with tolerances in inches-601 to 5,000 volts. |
| 8 | Fuse ratings or instantaneous settings of circuit breakers for short-circuit protection of portable cables. |
| 9 | Specifications for portable cables longer than 500 feet. |
| 10 | High voltage trailing cable ampacities and outside diameters. |
Table 1-Portable Power Cable Ampacities-600 Volts (Amperes Per Conductor Based on 60 °C. Copper Temperature-40 °C. Ambient)
| Conductor size-AWG or MCM | Single conductor | 2-conductor, round or flat | 3-conductor, round or flat | 4-conductor | 5-conductor | 6-conductor |
| 8 | 45 | 40 | 35 | 30 | 25 | 20 |
| 6 | 60 | 50 | 50 | 40 | 35 | 30 |
| 4 | 85 | 70 | 65 | 55 | 45 | 35 |
| 3 | 95 | 80 | 75 | 65 | 55 | 45 |
| 2 | 110 | 95 | 90 | 75 | 65 | 55 |
| 1 | 130 | 110 | 100 | 85 | 75 | 65 |
| 1/0 | 150 | 130 | 120 | 100 | 90 | 80 |
| 2/0 | 175 | 150 | 135 | 115 | 105 | 95 |
| 3/0 | 205 | 175 | 155 | 130 | 120 | 110 |
| 4/0 | 235 | 200 | 180 | 150 | 140 | 130 |
| 250 | 275 | 220 | 200 | 160 | ||
| 300 | 305 | 240 | 220 | 175 | ||
| 350 | 345 | 240 | 235 | 190 | ||
| 400 | 375 | 280 | 250 | 200 | ||
| 450 | 400 | 300 | 270 | 215 | ||
| 500 | 425 | 320 | 290 | 230 |
Table 2-Portable Cord Ampacities-600 Volts (Amperes Per Conductor Based on 60 °C. Copper Temperature-40 °C. Ambient)
| Conductor size-AWG | 1-3 conductor | 4-6 conductor | 7-9 conductor |
| 14 | 15 | 12 | 8 |
| 12 | 20 | 16 | 11 |
| 10 | 25 | 20 | 14 |
Table 3-Portable Power Cable Ampacities-601 to 5,000 Volts (Amperes Per Conductor Based on 75 °C. Copper Temperature-40 °C. Ambient)
| Conductor size-AWG or MCM | 3-conductor types G-GC and SIIC-GC 2,000 volts | 3-conductor type SHD-GC 2,001-5,000 volts |
| 6 | 65 | 65 |
| 4 | 85 | 85 |
| 3 | 100 | 100 |
| 2 | 115 | 115 |
| 1 | 130 | 130 |
| 1/0 | 145 | 145 |
| 2/0 | 170 | 170 |
| 3/0 | 195 | 195 |
| 4/0 | 220 | 220 |
| 250 | 245 | 245 |
| 300 | 275 | 275 |
| 350 | 305 | 305 |
Table 4-Nominal Diameters of Round Cables With Tolerances in Inches-600 Volts
| Conductor size-AWG or MCM | Single conductor | 2-conductor | 3-conductor | 4-conductor-Types W & G | 5-conductor-Types W & G | 6-conductor | |||||
| Types W & G twisted | Type PG, 2 power | Type PCG, 3 power, ground | Types W & G | Type PG, 3 power, ground | Type PCG, 3 power, 2 control, ground | Type w | Tolerance | ||||
| 8 | 0.44 | 0.81 | 0.84 | 0.94 | 0.91 | 0.93 | 1.03 | 0.99 | 1.07 | 1.18 | ±0.03 |
| 6 | .51 | .93 | .93 | .98 | 1.01 | 1.03 | 1.18 | 1.10 | 1.21 | 1.31 | ±.03 |
| 4 | .57 | 1.08 | 1.08 | 1.10 | 1.17 | 1.20 | 1.29 | 1.27 | 1.40 | 1.52 | ±.03 |
| 3 | .63 | 1.17 | 1.17 | 1.20 | 1.24 | 1.27 | 1.31 | 1.34 | 1.48 | 1.61 | ±.03 |
| 2 | .66 | 1.27 | 1.27 | 1.29 | 1.34 | 1.34 | 1.39 | 1.48 | 1.61 | 1.75 | ±.03 |
| 1 | .74 | 1.44 | 1.44 | 1.44 | 1.51 | 1.52 | 1.52 | 1.68 | 1.88 | 2.05 | ±.03 |
| 1/0 | .77 | 1.52 | 1.52 | 1.52 | 1.65 | 1.68 | 1.68 | 1.79 | 1.96 | 2.13 | ±.04 |
| 2/0 | .82 | 1.65 | 1.65 | 1.65 | 1.75 | 1.79 | 1.79 | 1.93 | 2.13 | 2.32 | ±.04 |
| 3/0 | .87 | 1.77 | 1.77 | 1.77 | 1.89 | 1.93 | 1.93 | 2.07 | 2.26 | 2.49 | ±.05 |
| 4/0 | .93 | 1.92 | 1.92 | 1.92 | 2.04 | 2.13 | 2.13 | 2.26 | 2.46 | 2.71 | ±.05 |
| 250 | 1.03 | 2.16 | 2.16 | 2.16 | 2.39 | 2.39 | 2.39 | 2.66 | ±.06 | ||
| 300 | 1.09 | 2.32 | 2.56 | 2.84 | ±.06 | ||||||
| 350 | 1.15 | 2.43 | 2.68 | 2.98 | ±.06 | ||||||
| 400 | 1.20 | 2.57 | 2.82 | 3.14 | ±.06 | ||||||
| 450 | 1.26 | 2.67 | 2.94 | 3.26 | ±.06 | ||||||
| 500 | 1.31 | 2.76 | 3.03 | 3.40 | ±.06 | ||||||
Table 5-Nominal Dimensions of Flat Cables With Tolerances in Inches-600 Volts
| Conductor size-AWG | 2-conductor | 3-conductor-Type G | ||||||||||
| Type W | Type G | Major | Minor | |||||||||
| Major | Minor | Major | Minor | O.D. | Tolerance | O.D. | Tolerance | |||||
| O.D. | Tolerance | O.D. | Tolerance | O.D. | Tolerance | O.D. | Tolerance | |||||
| 8 | 0.84 | ±0.04 | 0.51 | ±0.03 | ||||||||
| 6 | .93 | ±.04 | .56 | ±.03 | 1.02 | ±.04 | 0.56 | ±.03 | 1.65 | ±0.06 | 0.67 | ±0.05 |
| 4 | 1.05 | ±.04 | .61 | ±.03 | 1.15 | ±.04 | .61 | ±.03 | 1.85 | ±.06 | .75 | ±.05 |
| 3 | 1.14 | ±.04 | .68 | ±.03 | 1.26 | ±.04 | .68 | ±.03 | 1.99 | ±.06 | .77 | ±.05 |
| 2 | 1.24 | ±.04 | .73 | ±.03 | 1.35 | ±.04 | .73 | ±.06 | 2.10 | ±.06 | .81 | ±.05 |
| 1 | 1.40 | ±.04 | .81 | ±.03 | 1.55 | ±.04 | .81 | ±.03 | 2.43 | ±.06 | .97 | ±.05 |
| 1/0 | 1.51 | ±.04 | .93 | ±.03 | 1.67 | ±.04 | .93 | ±.03 | ||||
| 2/0 | 1.63 | ±.04 | .99 | ±.03 | 1.85 | ±.04 | .99 | ±.03 | ||||
| 3/0 | 1.77 | ±.04 | 1.03 | ±.03 | 2.00 | ±.04 | 1.03 | ±.03 | ||||
| 4/0 | 1.89 | ±.04 | 1.10 | ±.03 | 2.10 | ±.04 | 1.10 | ±.03 | ||||
Table 6-Nominal Diameters of Heavy Jacketed Cords With Tolerances In Inches-600 Volts
| Conductor size-AWG | 2-conductor | 3-conductor | 4-conductor | 5-conductor | 6-conductor | 7-conductor | ||||||
| Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance | |
| 14 | 0.64 | ±0.02 | 0.67 | ±0.02 | 0.71 | ±0.02 | 0.78 | ±0.03 | 0.83 | ±0.03 | 0.89 | ±0.03 |
| 12 | .68 | ±.02 | .72 | ±.03 | .76 | ±.03 | .83 | ±.03 | .89 | ±.03 | .98 | ±.03 |
| 10 | .73 | ±.03 | .80 | ±.03 | .84 | ±.03 | .90 | ±.03 | 1.00 | ±.03 | 1.07 | ±.03 |
Table 7-Nominal Diameters of Three-Conductor Portable Power Cables With Tolerances in Inches-601 to 5,000 Volts
| Conductor size-AWG or MCM | Type G-GC (nonshielded) 2,000 volts | Type SHC-GC (shielded overall) 2,000 volts | Type SHD-GC (individually shielded power conductors) 2,001-3,000 volts | Type SHD-GC (individually shielded power conductors) 3,001-5,000 volts | ||||
| Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance | Diameter | Tolerance | |
| 6 | 1.25 | + 0.10, -0.06 | 1.39 | + 0.11, -0.07 | 1.62 | + 0.13, -0.08 | 1.78 | + 0.14, -0.09 |
| 4 | 1.40 | + .11, -.07 | 1.55 | + .12, -.08 | 1.77 | + .14, -.09 | 1.90 | + .15, -.10 |
| 3 | 1.48 | + .12, -.07 | 1.62 | + .13, -.08 | 1.84 | + .15, -.09 | 1.98 | + .16, -.10 |
| 2 | 1.55 | + .12, -.08 | 1.71 | + .14, -.09 | 1.92 | + .15, -.10 | 2.09 | + .17, -.11 |
| 1 | 1.74 | + .14, -.09 | 1.89 | + .15, -.09 | 2.04 | + .16, -.10 | 2.18 | + .17, -.11 |
| 1/0 | 1.84 | + .15, -.09 | 2.02 | + .16, -.10 | 2.18 | + .17, -.11 | 2.34 | + .19, -.12 |
| 2/0 | 1.99 | + .16, -.10 | 2.16 | + .17, -.11 | 2.29 | + .18, -.12 | 2.46 | + .20, -.12 |
| 3/0 | 2.12 | + .17, -.11 | 2.30 | + .18, -.11 | 2.45 | + .20, -.12 | 2.62 | + .21, -.13 |
| 4/0 | 2.30 | + .18, -.12 | 2.48 | + .20, -.12 | 2.62 | + .21, -.13 | 2.76 | + .22, -.14 |
| 250 | 2.46 | + .20, -.12 | 2.70 | + .22, -.13 | ||||
| 300 | 2.63 | + .21, -.13 | 2.84 | + .23, -.14 | ||||
| 350 | 2.75 | + .22, -.14 | 2.97 | + .24, -.15 | ||||
Table 8-Fuse Ratings or Instantaneous Setting of Circuit Breakers for Short-Circuit Protection of Portable Cables and Cords
| Conductor size-AWG or MCM | Ohms/1,000 ft. at 25 °C. | Maximum allowable fuse rating (amperes) | Maximum allowable circuit breaker instantaneous setting (amperes)1 |
| 14 | 2.62 | 20 | 50 |
| 12 | 1.65 | 30 | 75 |
| 10 | 1.04 | 40 | 150 |
| 8 | .654 | 80 | 200 |
| 6 | .410 | 100 | 300 |
| 4 | .259 | 200 | 500 |
| 3 | .205 | 250 | 600 |
| 2 | .162 | 300 | 800 |
| 1 | .129 | 375 | 1,000 |
| 1/0 | .102 | 500 | 1,250 |
| 2/0 | .081 | 1,500 | |
| 3/0 | .064 | 2,000 | |
| 4/0 | .051 | 2,500 | |
| 250 | .043 | 2,500 | |
| 300 | .036 | 2,500 | |
| 350 | .031 | 2,500 | |
| 400 | .027 | 2,500 | |
| 450 | .024 | 2,500 | |
| 500 | .022 | 2,500 |
1 Higher circuit-breaker settings may be permitted for special applications when justified.
Table 9-Specifications for Portable Cables Longer Than 500 Feet1
| Conductor size-AWG or MCM | Max. allowable length (feet) | Normal ampacity at 60 °C. copper temperature (40 °C. ambient) | Resistance at 60 °C. copper temperature (ohms) |
| 6 | 550 | 50 | 0.512 |
| 4 | 600 | 70 | .353 |
| 3 | 650 | 80 | .302 |
| 2 | 700 | 95 | .258 |
| 1 | 750 | 110 | .220 |
| 1/0 | 800 | 130 | .185 |
| 2/0 | 850 | 150 | .157 |
| 3/0 | 900 | 175 | .130 |
| 4/0 | 1,000 | 200 | .116 |
| 250 | 1,000 | 220 | .098 |
| 300 | 1,000 | 240 | .082 |
| 350 | 1,000 | 260 | .070 |
| 400 | 1,000 | 280 | .061 |
| 450 | 1,000 | 300 | .054 |
| 500 | 1,000 | 320 | .050 |
1 Fuses shall not be used for short-circuit protection of these cables. Circuit breakers shall be used with the instantaneous trip settings not to exceed the values given in Table 8.
Table 10-High Voltage Trailing Cable Ampacities and Outside Diameters
| Power conductor | Ampacity * | Outside diameter ** (inches) | ||
| Size AWG or kcmil | Amperes per conductor | SHD-GC 2001 to 5000 volts | SHD-CGC 2001 to 5000 volts | SHD-PCG 2001 to 5000 volts |
| 6 | 93 | 1.56 | 1.62 | |
| 4 | 122 | 1.68 | 1.73 | |
| 3 | 140 | 1.78 | 1.82 | 1.94 |
| 2 | 159 | 1.87 | 1.91 | 2.03 |
| 1 | 184 | 1.95 | 1.98 | 2.12 |
| 1/0 | 211 | 2.08 | 2.10 | 2.26 |
| 2/0 | 243 | 2.20 | 2.20 | 2.40 |
| 3/0 | 279 | 2.36 | 2.36 | 2.58 |
| 4/0 | 321 | 2.50 | 2.50 | 2.76 |
| 250 | 355 | 2.69 | 2.69 | |
| 300 | 398 | 2.81 | 2.81 | |
| 350 | 435 | 2.95 | 2.95 | |
| 500 | 536 | 3.31 | 3.31 | |
* These ampacities are based on single isolated conductor in air, operated with open-circuited shield for a 90 °C conductor temperature and an ambient temperature of 40 °C.
** Tolerances for the outside diameter are + 8%/-5%.
30 C.F.R. 18 app I to Subpart D of Part 18