3 Conductor Cable Ampacity

10 amps 7 amps.

3 conductor cable ampacity.

Usually a general purpose house circuit is designed for 20. Table 310 15 b 3 a adjustment factors for more than three current carrying conductors in a raceway or cable. You must use the correct size wire for the current load requirement of the circuit to prevent the wire from overheating. The number and type of electrical devices connected to a circuit determine the ampacity requirement of the conductor.

Aluminum conductors copper clad conductors. Each has a different ampacity for a specified gauge size and these ampacities are found in nec table 310 15 b 16 for the calculations in this app. 2 3 or 4 3 or 4. Current is measured in amperes or amps.

For dwelling units conductors as listed below shall be permitted as 120 240 volt 3 wire single phase service entrance conductors service lateral conductors and feeder conductors that serve as the main power feeder to a dwelling unit and are installed in raceway or cable with or without an equipment grounding conductor. Over 15 2 m soow service oil resistant insulation jacket weather resistant 18 awg. Wire ampacity tables ampacities of insulated conductors from nec table 310 16 not more than three conductors in raceway or cable or earth directly buried based on ambient temperature of 30 c 86 f size. 2 3 or 4 3 or.

60 c 140 f. Where the number of current carrying conductors in a raceway or cable exceeds 3 the allowable ampacities shall be reduced per the table below. 0 50 ft. Wire cable type.

For example 3 0 awg copper has an ampacity of 200 amps at 75 while 3 0 awg aluminum has an ampacity of 155 amps at 75. These values are based on allowable ampacities of insulated conductors rated up to and including 2000 volts not more than three current carrying conductors in a raceway cable or earth single insulated conductor in free air and an ambient air temperature of 30 c 86 f. Where the number of current carrying conductors in a raceway or cable exceeds three or where single conductors or multiconductor cables are stacked or bundled longer than 600 mm without maintaining spacing and are not installed in raceways the allowable ampacity of each conductor shall be reduced as shown in table 3 10 1 15 b 2 a.