NEC wire ampacity

Conductor Sizing

Select the code edition and installation conditions. The tool calculates load current, applies NEC table ampacity logic, and recommends the smallest conductor for the chosen number of parallel runs.

Inputs

Calculation Setup

Code basis

NEC edition Material Wire / cable type

Load input

Load current Load power

Load current

Load power

kVA

Power basis Power factor

System Voltage

Installation conditions

Ambient temperature Current-carrying conductors Termination rating

Parallel runs 1

Reference

NEC Table 310.15(B)(16)

Show material

Size	Copper			Aluminum / copper-clad aluminum
Size	60 deg C	75 deg C	90 deg C	60 deg C	75 deg C	90 deg C

Reference

NEC Table 250.122

Maximum overcurrent device	Copper equipment grounding / bonding conductor	Aluminum / copper-clad aluminum equipment grounding / bonding conductor