Allowable Ampacities

Allowable Ampacities of not More Than 3 Insulated Conductors

Rated 0-2000 Volts, 60º to 90ºC (140º to 194ºF), In Raceway or Cable or Earth (Directly Buried). Based on ambient air temperature of 30ºC (86ºF).

Copper

Size Temperature Rating of Conductor Temperature Rating of Conductor Temperature Rating of Conductor
AWG 60ºC (140ºF) - TW*, UF 75ºC (167ºF) - FEWP*, RH*, RHW*, THHW*, THW*, THWN*, XXHW*, US E*, ZQ* 90ºC (194ºF) - TA, TBS , SA, SIS, FEP*, FEPB*, MI, RHH*, RHW-2, THHN*, THHW*, THW-2, THWN-2, US E-2, XHH, XHHW*, XHHW-2, ZW-2
18 0 0 141
16 0 0 18
14 20* 20* 25*
12 25 25* 30*
10 30 35* 40*
8 40 50 55
6 55 65 75
4 70 85 95
3 85 100 110
2 95 115 130
1 110 130 150
1/0 125 150 170
2/0 145 175 495
3/0 165 200 225
4/0 195 230 260
250 215 255 290
300 240 285 320
350 260 310 350
400 280 335 380
500 320 380 430
600 355 420 475
700 385 460 520
750 400 475 535
800 410 490 555
900 435 520 585
1000 455 545 615
1250 495 590 665
1500 520 625 705
1750 545 650 735
2000 560 665 750

* Unless otherwise specifically permitted elsewhere in this Code, the overcurrent protection for conductor types marked with an asterisk(*) shall not exceed 15 amperes for No. 14, 20 amperes for No. 12, and 30 amperes for No. 10 copper; or 15 amperes for 15 amperes for no. 12 and 25 ampers for No. 10 aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied. Table 310-16 NEC.

This information presented within this section has been carefully prepared and is believed to be accurate. Alan Wire Company makes no warranties, expressed or implied, and disclaim any responsibility or liability for loss or damage as a result of the use of this information.