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 DIY Chatroom Home Improvement Forum need to add 240V pwr..

10-03-2014, 05:32 PM   #31
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Quote:
 Originally Posted by golf12 how do I tell what size the panel is and the gauge of the wires? Is there another way to tell if there's no lettering visible on the wires?.

Can you measure the diameter of the main supply cables ?

10-03-2014, 10:45 PM   #32
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Quote:
 Originally Posted by Jump-start FWIW, homes with electric heat are generally calced at 10 watts per square foot. So an insulated home that's 450 square feet would need 4,500 watts, rounded up to 5000. 5000 watts divided by 240 is 20amps.
Don't forget to factor for continuous load.
240X20X.8=3840 watts
I think you can safely squeeze 2 of those 2000 watt units on this 20 amp circuit, but would it be sufficient? ?

If you were going to try for a 30 amp circuit:
240X30X.8=5760 watts

Last edited by Jake.; 10-03-2014 at 10:55 PM. Reason: Add info.

10-04-2014, 10:25 AM   #33
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Quote:
 Originally Posted by Jake. Don't forget to factor for continuous load. 240X20X.8=3840 watts I think you can safely squeeze 2 of those 2000 watt units on this 20 amp circuit, but would it be sufficient? ? If you were going to try for a 30 amp circuit: 240X30X.8=5760 watts
Thanks, I know. Good point though for the OP.

When sizing electric heat circuits always load them 80% of the handle rating.

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