Wiring Setup For 240 Volt Heater - Electrical - DIY Chatroom Home Improvement Forum

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Old 01-21-2009, 10:44 PM   #1
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Wiring setup for 240 volt heater

Here's the basics:
  • I have a 240 volt, 4000 watt space heater with no way to plug it into the garage.
  • I currently have a 30 amp, double pole breaker, 20 amp outlet and 20 amp (240 volt) male plug end.
  • I have 10-2 wire. The heater doesn't need a neutral. I know I need to tape the white wire black or red.

  • Will using a 30 amp breaker described above work with a 20 amp outlet and male plug?
    • Is 30 amps enough (the math I did says it'll drain 16.7 amps, so I went above 20).
    • When I wire the 10-2, the two hots go to the breaker and the ground goes to the ground bar, correct?


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Old 01-21-2009, 11:18 PM   #2
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Let me get this right.,

You have 4,000 watt heater and it came with 20 amp cord and plug ?

If so then read on .,,

You will have to change the breaker down to 20 amp.
Make sure you get the same namebrand as what it is in there.

And you mention 10-2 conductors in there ? If so you can leave them alone with Romexs or UF's if you have to remark it make sure you remarked with marker { this is my prefered way But the tape is legit option as well } ethier red or bleu marker.

The bare grounding conductor don't mess with it leave it alone as long it is secured in proper location.

If you have more question just holler one of us will help ya



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Old 01-22-2009, 08:16 AM   #3
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You must use a 20 amp breaker to match the 20 amp plug and receptacle. You are not permitted to put 20 plug/receptacle on a 30 amp circuit.
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Old 01-22-2009, 05:00 PM   #4
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Does that mean since the heater runs almost 17 amps, that I should just get a 30 amp plug and outlet to hook up to the heater?
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Old 01-22-2009, 05:13 PM   #5
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If the heater is the only thing on this circuit, you can run it on the 20A circuit with the 20A plug/receptacle.
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