Yellow Vs. White Romex

Yellow Romex can be seen inside an electrical box.

Manufactured by Southwire, Romex is a widespread type of residential wiring used in many home applications. Also called Non-metallic (NM) sheathed cable, Romex consists of two or three Thhn wires and a ground wire. There are four main types of Romex wires, each delivering different amperage and denoted by a separate color for quick recognition.

White Romex

With the lowest amperage available, white Romex has a load capacity of 15 amps. It is commonly used for outlets, lights and smoke detectors in the home. This 14-gauge wire is called 14-2 when two insulated wire conductors are included and 14-3 with three wires.

Yellow Wire

The heavier, yellow Romex is rated at 20 amps. Common applications for this 12-gauge wire are receptacles and three-way circuits. Larger appliances, such as a microwave or welder, require the additional power this wire delivers.

Weight Difference

There is a significant weight difference between the 14- and 12-gauge Romex. White Romex with two wires, 14-2, weighs 57 pounds for every 1,000 feet of wire. With three wires, 14-3, the weight increases to 74 pounds. Compare this to the weight of yellow Romex at 82 pounds. for 12-2 and 107 pounds for 12-3 wire.

References

• Romex Wire by Southwire
• Ask The Electrician: Electrical Romex for the Home
• Electrical Wire: Romex Cable