For example, white sheathing means that the inner wires are 14-gauge and yellow sheathing indicates that they are 12-gauge. … The National Electrical Code (NEC) says that white or gray must be used for neutral conductors and that bare copper or green wires must be used as ground wires. What is yellow sand used for? what is builders sand used for.

What do the colors of Romex mean?

Romex Extra Color NM-B is a line of nonmetallic cable color-coded by gauge size. No. 14 is white, No. 12 is yellow, No. … The colors simplify inventory management for distributors and provide easier installations for contractors.

What does yellow electrical wire mean?

Blue and yellow wires are most commonly found in commercial buildings and are used as the live wires pulled through a conduit. … Yellow wires are used as switch legs to ceiling fans, structural lights, and outlets paired with light switches, while blue wires are usually used as travelers for three-or-four-way switches.