Multi Conductor Cable Ampacity Chart

Based on nec table 310 60 c 73 ampacities of an insulated triplexed or three single conductor copper cables in isolated conduit in air based on conductor temperatures of 90 c 194 f and 105 c and 221 f and ambient air temperature of 40 c 104 c 1.

Multi conductor cable ampacity chart.

1 for cables with a service temperature of max. The number and type of electrical devices connected to a circuit determine the ampacity requirement of the conductor. Home products our products lie in the walls of your home in the transmission lines that power our neighborhoods in the places we work schools where we learn and the hospitals that keep us well. Ampacities based on 90 c and 30 c ambient temperature per table 400 5 b of the national electric code.

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. Table 6 19 three conductor cable direct burial two circuits two cables 33 table 6 20 single conductor cable in air 34 table 6 21 three single conductor cables in air 35 table 6 22 three conductor cable in air 36 table 6 23 three single conductor cables in conduit in air 37 table 6 24 three conductor cable conduit in air one. The environment surrounding a wiring method can affect the ampacity of the conductors. Where the number of current carrying conductors in a raceway or cable exceeds three or where single conductors or multi conductor cables are stacked or bundled longer than 24 inches without maintaining spacing and are not installed in raceways the allowable ampacity of each conductor shall be reduced as shown in the following table.

Nm b is permitted to be manufactured with conductors as large as 2 awg but multiconductor uf b is limited to conductors no larger than 6 awg by the ul standard. Southwire is one of the world s leading manufacturers of wire and cable tools components and assembled solutions. Nec table 310 15 b 16 ampacities are based on an ambient temperature of. Based on nec table 310 60 c 74 ampacities of an insulated.

Multi conductor type w portable power cable is part of allied wire cable s stock of electrical power cable. 70 c at the conductor current carrying capacity of cables for multi core cables with a nominal section up to 10 mm2 vde 0298 t4 06 13 table 26. Usually a general purpose house circuit is designed for 20. You must use the correct size wire for the current load requirement of the circuit to prevent the wire from overheating.