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Unless they're on ground wires, non-insulated terminals require external insulation. Polyolefin heat-shrink tubing is a standby since it's affordable, durable, and shrinks to half its diameter when heated. Choose tubing with a large enough inside diameter to slip over the terminal's barrel, and trim it about 1/8- to 3/16-inch longer than the barrel itself. It goes without saying that you'll have to slip this insulation over the wire before fastening the terminal, but we'll remind you anyway. View Related Article
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