How to Wire a 30-amp RV Plug

by John Cagney Nash
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The 30-amp RV plug is a three-pronged male cable end. The plug is American National Standards Institute (ANSI) stock, designated TT-30P. It is manufactured and used specifically for all types of recreational vehicles (RVs). The 30-amp RV plug is colloquially known as an RV-30. It has two angled flat blades, and one U-shaped pin. Wiring a 30-amp RV plug to a preexisting umbilical from the RV is a simple matter, and can be accomplished with normal household electrical tools.

Step 1

Trim an inch of the cord’s jacket material away from the three wires, using the craft knife. Be careful not to damage the separate insulation covering each wire.

Step 2

Strip 1/2 inch of insulation from each of the three wires, using the wire strippers. Twist the bared strands of each wire, so you have three tight, rope-like threads.

Step 3

Unscrew the fastener in the center of the TT-30P's underside, turn it over so that the pins point downward, and lift off the top. Be careful not to draw the brass pins from their respective housings.

Step 4

Follow the color codes, which match wires to connections. The black, hot wire attaches to the brass-colored screw. The white, neutral wire attaches to the silver-colored screw. The green (sometimes bare), ground wire attaches to the green-colored screw. If there is no green screw, attach the ground wire to the U-shaped pin.

Step 5

Secure the cord to the inside of the 30-amp RV plug by tightening the small internal harness across the top of the cord’s jacket material.

Replace the plug’s top, and reinstall the fastener.

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