Number 4 Wire Size

American wire gauge size calculator and chart.

Number 4 wire size.

The national electrical code nec has a letter system that makes it easy to quickly identify a wire s capabilities. 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. The tables below are intended to be a general guide for wire size and amp ratings. The allowable number of wires that can be placed inside a conduit varies according to the type and size of the conduit and also on the size of the conducting wires.

Thhn is the most commonly used wire in conduit and cable trays for services in commercial or industrial applications. Current is measured in amperes or amps. You must use the correct size wire for the current load requirement of the circuit to prevent the wire from overheating. The smaller the awg number the larger the wire diameter.

The n gauge wire diameter d n in millimeters mm is equal to 0 127mm times 92 raised to the power of 36 minus gauge. Wire size is defined by the american wire gauge or awg number. Usually a general purpose house circuit is designed for 20. The number and type of electrical devices connected to a circuit determine the ampacity requirement of the conductor.

The n gauge wire diameter d n in inches in is equal to 0 005in times 92 raised to the power of 36 minus gauge number n divided by 39. 60 c 140 f 75 c 167 f awg mm copper. Black 50 ft. This is a handy rule to remember when making rough wire size estimations.

For very large wire sizes fatter than 4 0 the wire gauge system is typically abandoned for cross sectional area measurement in thousands of circular mils mcm borrowing the old roman numeral m to denote a multiple of thousand in front of cm for circular mils. 4 0 4 0 2 0 black stranded al sweetbriar urd cable model 55418401 view the southwire company aluminum underground residential distribution urd cable assortment. D n in 0 005 in 92 36 n 39.