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Tool Talk Discussion Forum

Re: 3 phase question

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Author  [Modern View]

10-24-2013 08:48:01

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Electric heaters operated on 208 instead of 240 will produce approx 75% of nameplate heat. 208 instead of 220v will drop output to 89% . So the operator of an electric stove or clothes dryer would never notice the difference unless operated continuous at 100%. Single phase well pumps and AC units will usually slug along ok on 208V as manufactures make some allowances. Ideally the house AC and well pump would be three phase 208. Motor efficiency will be much improved over the single phase versions of the same capacity .

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10-24-2013 09:09:47

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 Re: 3 phase question in reply to buickanddeere, 10-24-2013 08:48:01  
Thanks. The only problem I might have is I found a real nice deal on an air conditioner that isn't 3 phase. It is marked 208/230v single phase. Will it work alright? I understand the benefit behind finding a 3 phase unit, but the price is right on the one I found.

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dr sportster

10-24-2013 10:01:11

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 Re: 3 phase question in reply to WyoDave, 10-24-2013 09:09:47  
Yes it will work fine it only needs a two pole breaker to feed the receptacle where it plugs in.

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dr sportster

10-24-2013 10:06:12

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 Re: 3 phase question in reply to dr sportster, 10-24-2013 10:01:11  
Or a two pole disconnect if it is an outside unit. [I assume too much ] Maybe not a window unit.

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