Electrical Wire Amperage Rating

Ampacity rating copper wire conductors.

Electrical wire amperage rating.

The amperage rating of a cord is a function of the wire gauge number of current carrying conductors and length of the cord. The tables below are intended to be a general guide for wire size and amp ratings. 60 c 140 f 75 c 167 f awg mm copper. Electrical conductor wire size or gauge awg or kcmil.

Nfpa 70 national electrical code table 310 15 b 16 size 60 c 140 f 75 c 167 f 90 c 194 f 60 c 140 f 75 c 167 f 90 c 194 f size. You must use the correct size wire for the current load requirement of the circuit to prevent the wire from overheating. The proper circuit size as indicated by amperage is determined by several factors including the planned load on the circuit the number of outlets or light fixtures and the length of the circuit. Current is measured in amperes or amps.

When a cord has three current carrying conductors there is a decrease in amperage. Awg or kcmil types tw uf types rhw thw thwn. Usually a general purpose house circuit is designed for 20. Wire size chart and maximum amp ratings.

Likewise when the length of the cord exceeds fifty feet there is a decrease in amperage.