Warning
Wires not properly matched to the amperage of the circuits they serve can create a notable risk of short circuits and fire.
Electrical Wiring Sheathing
Most interior wiring is done with non-metallic, or NM, cable—sometimes referred to by a popular brand name Romex. NM cable is made of three or more wires wrapped inside a flexible plastic jacket, or sheathing. It is used for most interior circuits, such as those for outlets, switches, light fixtures, and appliances.
The color of the sheathing indicates the gauges of the wires within the sheathing:
White : 14-gauge wires intended for 15-amp service
Yellow : 12-gauge wires intended for 20-amp…
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