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Allowable Copper Conductor Ampacities

Instrumentation, Electronics and Control Sensors

Allowable Copper Conductor Ampacities per. (NEC) NFPA70

NEC Table 310.15(B)(16)
(formerly Table 310.16)

Allowable ampacities of insulated copper 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).

Rated 0-2000 Volts, 60° to 90°C (140° to 194°F), in Raceway or Cable or Earth (directly buried). Based on ambient air temperature of 30°C (86°F).

60°C (140°F)
Types
TW†, UF†

75°C (167°F)
Types
FEPW†, RH†, RHW†,
THHW†, THW†, THWN†,
XHHW†, USE†, ZW†

90°C (194°F)
Types
TA,TBS, SA, SIS, FEP†, FEPB†,
MI, RHH†, RHW-2, THHN†,
THHW†, THW-2, USE-2, XHH,
XHHW†, XHHW-2, ZW-2

National Electrical Code Allowable Copper Conductor Ampacities
2017 Edition of the National Electrical Code (NEC) NFPA70

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