Final answer:
The typical color for a 12 AWG wire jacket is yellow, which is suggested by the National Electrical Code for identifying the gauge without measuring the wire.
Step-by-step explanation:
The color jacket typically used for 12 AWG (American Wire Gauge) electrical wire is yellow. When working with residential wiring, the National Electrical Code (NEC) in the United States suggests color coding for nonmetallic (NM) sheathed cable, and this color coding helps to identify the gauge of the wire inside the sheathing. For instance, 14 AWG wires usually have a white jacket, 12 AWG wires are often covered by a yellow jacket, and 10 AWG wires generally come with an orange jacket. This color system can help electricians and DIY enthusiasts quickly identify the correct wire sizes for a specific application without needing to measure the wire.