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Allowable Ampacities of Insulated Conductors
all-categories-appendix-allowable-ampacities
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Allowable Ampacities of Insulated Aluminum or CopperClad Aluminum Conductors
Allowable Ampacities of Insulated Conductors
• Rated Up to and Including 2000 Volts, 60°C through 90°C (140°F through 194°F).• Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried).
• Based on Ambient Temperature of 30°C (86°F).
Conductor
Size
(AWG/KCMIL)60°C
(140°F)
TW, UF75°C
(167°F)
RHW, THHW, THW, THWN, XHHW, USE, ZW90°C
(194°F)
TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, XHH, XHHW, XHHW-2, USE-2, ZW, PV14* - - - 12* 15 20 25 10* 25 30 35 8 35 40 45 6 40 50 55 4 55 65 75 3 65 75 85 2 75 90 100 1 85 100 115 1/0 100 120 135 2/0 115 135 150 3/0 130 155 175 4/0 150 180 205 250 170 205 230 300 195 230 260 350 210 250 280 400 225 270 305 500 260 310 350 600 285 340 385 700 315 375 425 750 320 385 435 800 330 395 445 900 355 425 480 1000 375 445 500
* Unless specifically permitted in 240.4(E) through (G), the overcurrent protection shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied.See the NEC for conductor ampacities, correction factors, and conditions of use.
Updated 1/4/2022
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Allowable Ampacities of Insulated Copper Conductors
Allowable Ampacities of Insulated Conductors
• Rated Up to and Including 2000 Volts, 60°C through 90°C (140°F through 194°F).• Not More Than Three Current-Carrying Conductors in Raceway, Cable, or Earth (Directly Buried).
• Based on Ambient Temperature of 30°C (86°F).
Conductor
Size
(AWG/KCMIL)60°C
(140°F)
TW, UF75°C
(167°F)
RHW, THHW, THW, THWN, XHHW, USE, ZW90°C
(194°F)
TBS, SA, SIS, FEP, FEPB, MI, RHH, RHW-2, THHN, THHW, THW-2, THWN-2, XHH, XHHW, XHHW-2, USE-2, ZW, PV14* 15 20 25 12* 20 25 30 10* 30 35 40 8 40 50 55 6 55 65 75 4 70 85 95 3 85 100 115 2 95 115 130 1 110 130 145 1/0 125 150 170 2/0 145 175 195 3/0 165 200 225 4/0 195 230 260 250 215 255 290 300 240 285 320 350 260 310 350 400 280 335 380 500 320 380 430 600 350 420 475 700 385 460 520 750 400 475 535 800 410 490 555 900 435 520 585 1000 455 545 615
* Unless specifically permitted in 240.4(E) through (G), the overcurrent protection shall not exceed 15 amperes for 14 AWG, 20 amperes for 12 AWG, and 30 amperes for 10 AWG copper; or 15 amperes for 12 AWG and 25 amperes for 10 AWG aluminum and copper-clad aluminum after any correction factors for ambient temperature and number of conductors have been applied.See the NEC for conductor ampacities, correction factors, and conditions of use.
Updated 1/4/2022
