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How to Wire a 30-amp RV Plug

by John Cagney Nash

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.

Tips

  • If you are wiring the plug to an extension cord rather than directly to the heavy-duty umbilical which is part of the RV’s manufacturer-installed system, ensure the cord is sufficient to safely conduct a 30-amp current. Length of the extension cord will determine the gauge of the wire it must have.
  • For a 120-volt 30-amp extension cord of 25 feet, use 10-gauge wire; for 50 feet, use 8-gauge wire; for 100 feet, use 6-gauge wire. Increase the wire size for runs in excess of 100 feet, or for applications where heat cannot be easily dissipated, such as for cords housed in a conduit. Ensure the outer jacket of the extension cord you choose is resistant to ozone, chemicals and petroleum-based products. Ensure the jacket material is designed to be flexible in sub-zero conditions.

Items you will need

  • Craft knife
  • Wire strippers
  • Screwdriver

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