How to Wire a 30 Amp Plug for a Construction Heater

Written by l.p. klages
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How to Wire a 30 Amp Plug for a Construction Heater
(Hemera Technologies/ Images)

Construction heaters are often the only way to maintain a decent temperature on a job site. They are heavy duty, outdoor heaters that require 240-volt circuits and a 30-amp breaker. Unfortunately, because of the transitory nature of construction sites, it’s often necessary to wire up your own 30-amp, 220-volt plug to get a heater working. The good news is that you won’t have any walls to get around. Just run the wire to where you want it, and hook up both ends.

Skill level:

Things you need

  • 10/3 electrical cable
  • Outlet rated for 30 amps
  • 30-amp breaker
  • Wire strippers

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  1. 1

    Run the 10-gauge cable from the breaker panel to the outlet.

  2. 2

    Split the wires from the cable and stripe about an inch of each of the wires to expose the bare copper. Do this on both ends of the cable.

  3. 3

    Slide the wires into the terminals on the 30-amp plug. The plug will have the terminals marked as hot, hot, cold, and ground. Slide the black and red wires from the cable into the hot terminals, the white wire into the cold, and the bare or green wire into the ground terminal. Tighten the screws on each terminal to anchor the wires in place.

  4. 4

    Turn off the power to the breaker panel.

  5. 5

    Slide the 30-amp breaker firmly into place, in an empty breaker slot.

  6. 6

    Slide the red and black wires into each slot of the 30-amp breaker, and tighten the terminal screw to anchor them in place. Fasten the white wire to the neutral bus bar, and the ground wire to the grounding bus bar.

  7. 7

    Turn the power to the breaker panel back on to begin using your new plug.

Tips and warnings

  • Be sure the power to the breaker panel is off before installing the new breaker or you will be killed by an unfiltered electric shock.

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