
168 Shipboard Electrical Power Systems
TABLE7.5
Permissible Ampacity of Selected Low-Voltage 3-Phase Insulated Copper
Cables in Dry Location in Ambient Air at 30°C (86˚F)
AWG or kcmil*
Temperature Rating of Insulation
60°C (140°F) Type
T, TW, RUW
90°C (194°F) Type
TA, FEP, THHN,
XHHW*
125°C (257°F)
Insulation
200°C (392°F)
Special Use
14 15 25 30 30
10 30 40 50 55
6 55 70 85 95
4 70 90 115 120
2 95 120 145 165
1/0 125 155 200 225
2/0 145 185 230 250
3/0 165 210 265 285
4/0 195 235 310 340
250 215 270 335 —
350 260 325 420 —
500 320 405 500 —
750 400 500 620 —
1000 455 585 730 —
1500 520 700 — —
2000 560 775 — —
*
kcmil = 1000 circular mils = MCM in old usage (rst ...