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Allowable Ampacities of Insulated Conductors

The following table is provided for your convenience.  We believe that the data presented is reliable, however we make no claim as to the accuracy of the information.
 

Applicable To Conductors:

  • Rated 0 Through 2000 Volts

  • 60C Through 90C (140F Through 194F)

  • Not More Than Three Current-Carrying Conductors in
    Raceway, Cable, or Earth (Directly Buried)

  • Ambient Temperature of 30C (86F)

COPPER ALUMINUM
Conductor
Size
AWG or kcmil
Allowable
Ampacities*
Allowable
Ampacities*
Conductor
Size
AWG or kcmil
60C 75C 90C 60C 75C 90C
    TYPES THWN, RHW, USE TYPES THWN-2, USE-2, XHHW-2, XHHW, RHW-2, RHH   TYPES THWN, RHW, USE TYPES THWN-2, USE-2, XHHW-2, XHHW, RHW-2, RHH  
8 40 50 55 30 40 45 8
6 55 65 75 40 50 60 6
4 70 85 95 55 65 75 4
2 95 115 130 75 90 100 2
1 110 130 150 85 100 115 1
1/0 125 150 170 100 120 135 1/0
2/0 145 175 195 115 135 150 2/0
3/0 165 200 225 130 155 175 3/0
4/0 195 230 260 150 180 205 4/0
250 215 255 290 170 205 230 250
300 240 285 320 190 230 255 300
350 260 310 350 210 250 280 350
400 280 335 380 225 270 305 400
500 320 380 430 260 310 350 500
600 355 420 475 285 340 385 600
700 385 460 520 310 375 420 700
750 400 475 535 320 385 435 750
1000 455 545 615 375 445 500 1000

*Allowable Ampacities:  30C (86F) Ambient Temperature

Based on 2005 NEC, Table 310.16.

For different ambient temperatures than the one shown above, consult the NEC tables.

Temperature Limitations:  The temperature rating associated with the ampacity of a conductor shall be selected and coordinated so as not to exceed the lowest temperature rating of any connected termination, conductor, or device.  Conductors with temperature ratings higher than specified for terminations shall be permitted to be used for ampacity adjustment, correction, or both.

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