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Whether you're running a new circuit, extending an existing one, or rewiring after a repair, having a full spool of primary wire on hand saves a trip back to the parts store mid-project. East Penn's 8-gauge copper wire comes on a 100 ft spool in black, sized for higher-current 12V runs.
It's a single-conductor wire suited to general RV and automotive 12V wiring work.
Match gauge to your circuit's current draw and run length to keep voltage drop in check.