Wire Size Amp Rating Chart

Size of types thwn and thhn.

Wire size amp rating chart. 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. For the 00 000 0000 etc. Common us awg wire gauges and amps ratings. The number and type of electrical devices connected to a circuit determine the ampacity requirement of the conductor.

Wire size chart and maximum amp ratings. Amp chart lead wire current carrying capacity ampacity awg size insulated conductor temperature rating awg size at 80 c at 90 c at 105 c at 125 c at 150 c at 200 c 40 0 33 0 49 0 55 0 60 0 71 0 78 40 38 0 47 0 68 0 77. 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. Or kcmil kcmil rating amperes 4 2 100.

Current is measured in amperes or amps. Gauges you use 1 2 3 which makes more sense mathematically than double nought. 120 240 volt 3 wire single phase service entrance conductors service lateral conductors and feeder conductors that serve as the main power feeder. In the american wire gauge awg system wire size diameters can be calculated by applying the formula d awg 005 92 36 awg 39 inch.

1 current ratings for up to 1000 v pvc insulated single and multicore wiring cables ambient temperature up to 30 o c values for resistance are based on electrical resistivity for copper 1 724 x 10 8 ω m 0 0174 μω m and electrical resistivity for aluminum 2 65 x 10 8 ω m 0 0265 μω m. Awg or kcmil types tw uf types rhw thw thwn types tbs sa sis types tw uf types rhw thw thwn types tbs sa sis awg or. 60 c 140 f 75 c 167 f awg mm copper. The higher the gauge number the smaller the.

The tables below are intended to be a general guide for wire size and amp ratings. Usually a general purpose house circuit is designed for 20.