240 V circuit for electric baseboard

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  #1  
Old 02-25-06, 02:29 AM
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240 V circuit for electric baseboard

Excuse my ignorance... I've never done 240 v wiring.
I have old 240V circuit which used to be for a dryer. I want use it for electric baseboard heat in a room that is at the end on the line on my forced hot air system.

At the panel there are 2 breakers with one (#10?) 4-wire line. One is red/wh the other black/wh.
My question is: do I only hook up the red and the black wire to the heater? What about the white wire? This is the part I'm not understanding.
 
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  #2  
Old 02-25-06, 08:57 AM
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Please describe the cable a little better. It should be three or four wires. Please tell us what color the wires are.

Pure 240 volt loads (like baseboard heat) do not need a neutral. They only need a three wire circuit. That is two hot wires and a ground wire.
 
  #3  
Old 02-25-06, 10:04 AM
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Sounds like you have a 10/3 cable withe 1/white .1/black , 1/red and 1/ bare copper.
If this is correct then you only need the BK/RED/and bare copper conductors.

Do you have a thermistat for this peice of heat? is it line voltage(t-Stat)?
Before you size your breaker for this, you should calculate your load so as not to fuse it to high.
( wattage / by voltage will give you your amps.)
 
  #4  
Old 02-26-06, 03:12 AM
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Yes, I should said it's 4 wire, black, red, wire & grd. So all I need to do is connect the red, black and of course ground.


thanks
 
  #5  
Old 02-26-06, 05:42 AM
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You also need to size the breaker to the load. A 20 amp breaker may be too large for the load. You may need to step down to a 20 amp breaker.
 
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