8 3 Wire Amp Rating

40 amps 35 amps.

8 3 wire amp rating.

Wire size chart and maximum amp ratings. The amperage rating of a cord is a function of the wire gauge number of current carrying conductors and length of the cord. Common sizes include 14 12 10 8 6 and 2 gauge wire. Wire gauge refers the physical size of the wire rated with a numerical designation that runs opposite to the diameter of the conductors in other words the smaller the wire gauge number the larger the wire diameter.

Common us awg wire gauges and amps ratings. 8 3 stranded romex simpull cu nm b w g wire southwire 250 ft. 30 amps 25 amps. 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.

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. But the nec allows a single ranges up to 12kva to use a demand factor of 75 not 80 or 8kva when calculating the load so an 8kva appliance can use a 40 amp breaker and 8 3 conductors. When a cord has three current carrying conductors there is a decrease in amperage. 2 3 or 4 3 4 or 5.

The tables below are intended to be a general guide for wire size and amp ratings. Wire is sized by the american wire gauge awg system. The number and type of electrical devices connected to a circuit determine the ampacity requirement of the conductor. A 12000 watt appliance operating on 240 volts would require a 50 amp ocpd with 6 3 conductors.

The higher the gauge number the smaller the. Usually a general purpose house circuit is designed for 20. 55 amps 45 amps. 2 3 or 4 3 4 or 5.

The wire size chart below shows allowable ampacities of insulated 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 air temperature of 30 c 86 f. You must use the correct size wire for the current load requirement of the circuit to prevent the wire from overheating.