Service Cable Size

Or use one of the online voltage drop calculators.

Service cable size.

ρ specific resistance or resistivity of conductor. 40 x 1 25 14 3 50 14 3 67 amps. Calculating wire cable size formula for three phase circuits. Step 1 size the overcurrent device in accordance with 210 20 a and 215 3.

I load current. D distance in feet one way i e. The following steps and examples should help you understand the basic rules of how to size a cable per the nec. Wire circular mils 3 x 2 x ρ x i x l allowable voltage drop of source voltage where.

2 2 2 4 al ser the southwire company 500 ft. The southwire company 500 ft. The total circuit length. The main electrical service delivered to your house from the electrical utility company has a total available capacity measured in amps or amperes.

This cable is primarily used as a panel feeder in multiple unit dwellings. In the wire size table below give the typical diameter of 14 copper wire as 2 05 to 2 32 mm or about 0 081 0 092 inches. Electrical current is measured in amps. When it comes to the lines connecting master and secondary panels where the line will carry as much as a full 100 amps use a 2 gauge non metallic sheathed electrical cable.

2 2 2 4 al ser service entry electrical cable can be used in wet and dry locations up to 90 c or 194 f. The calculator allows entry of a voltage drop but caution should be used when doing so to make sure you are calculating the wire sizes in accordance with nec article 210 19 fpn no. The cable must contain one or two hot wires depending on your needs one neutral wire and one ground wire. The figure we would plug into the calculator would be.

Amperage is a measurement of the volume of electricity flowing through wires and this measurement can vary between 30 amps in very old homes that have not been updated to as much as 400 amps in a very large home with extensive electric heating systems. For use in almost all applications where type se cable is allowed. The number of devices connected to the circuit usually determines how much current will flow through the wire. Each wire size or wire gauge awg has a maximum current limit that a wire can handle before damage occurs.

Most homes have an electrical service of between 100 to 200 amps. It is important to pick the correct size of wire so that the wire doesn t overheat.