240v help needed for heater.

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  #1  
Old 12-30-14, 03:00 PM
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240v help needed for heater.

I'm installing an outlet to run a 220 volt 15 amp (12.5 amp actual per specs) heater. I have 12-2 w/ ground but the ground is in paper and the romex only. the white and black are both insulated besides the paper and romex. can I use this wire?
 
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Old 12-30-14, 03:07 PM
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Personally, I would use 12/3. I don't like to use a white wire as a hot wire.
 
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Old 12-30-14, 03:13 PM
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Welcome to the forums.

First, let's clarify a few things to make the conversation flow better: This is a 240 volt circuit, not 220 and the romex is a cable which is a group of wires inside another sheath.

What is it that you're hooking up to this? What kind of plug does it require? Wouldn't surprise me if you needed 12-3 in order to have enough wires in the cable in the first place.
 
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Old 12-30-14, 03:31 PM
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sorry. yes 240. an electric heater will be plugged into the outlet that is a 15 amp twist-lok. the romex has a black insulated wire, a white insulated wire and an otherwise bare wire rapped in paper. the wire says 12-2 w/ground but i didn't know the ground wasn't separately insulated (green). will it be safe? i know it will work but i don't know about the "ground wire" being un-insulated. i read in another post that i might only need 2 wires anyway. true? or not?
 
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Old 12-30-14, 03:34 PM
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pulpo, I would too, but i have 250 feet of this stuff.
 
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Old 12-30-14, 04:04 PM
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12-2 should be fine,remark the white wire Red or Black, fuse for 20 amps on a 2 pole breaker,the 12-2 will be good for 16 amps at 80%, I would use a 20 A 250 V Rec. the ground must be used, I am not sure if that ground has to be insulated.I have since checked with the code Guru's and as long as the ground conductor is the same size,it's fine.
Geo
 

Last edited by Geochurchi; 12-30-14 at 05:41 PM. Reason: Added more info.
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Old 12-30-14, 04:06 PM
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Then bare ground will not be an issue. That is the way the cable is made and listed to be used. It is safely used everyday.

The white will need to be reidentified as a hot by wrapping with a a colored tape or magic marker. Red or black are commonly used.

A 240 volt circuit only needs two hot conductors to operate. However an equipment ground is needed for safety. That is the green or bare.
 
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Old 12-30-14, 04:20 PM
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timinmich, Then male sure that you mark the white wire with black tape to show that the wire is HOT.
 
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Old 12-30-14, 04:59 PM
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thank you everyone for the assistance. I feel much better about this project now.
 
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Old 12-30-14, 05:52 PM
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If it is a single 15 amp receptacle (dedicated circuit) then the breaker needs to be 15 amp as well.
 
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Old 12-30-14, 07:00 PM
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I would use a 20 A 250 V Rec.
Yes, the receptacle must be 20 amp rated.
 
  #12  
Old 12-30-14, 11:32 PM
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It would be helpful to have some more information. Did the heater come with a cord attached? Is it portable or will it be fixed in place?
 
  #13  
Old 12-31-14, 03:56 AM
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timinmich: I agree with Astuff. It would be best if you post a link maybe to the specific heater you are referring to.

If this heater is for residential use it would normally be a hardwired 240V circuit back to the breaker panel and not a plug and cord set up.

If in fact it is a 240V heater cord and plug it will have a specifically configured plug for its use and not a standard plug that would fit in a duplex receptacle even rated at 20amps that are found in residential homes (normally). If it is cord and plug it would probably require this type of receptacle---> Leviton 20 Amp Double Pole Single Outlet - White-R52-05821-0WS - The Home Depot Whether it is locking or not you would need a 2 pole 3 wire receptacle.

Plug and matching receptacles are configured specifically (to prevent accidental mis-use) to volts and amp ratings and also if it is locking or non locking plug.
 
  #14  
Old 12-31-14, 10:48 AM
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Is there any Mfg. Recommendations for circuit requirements?
Geo
 
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