COMMUNITY FORUM

that guy ty

07:10PM | 11/10/02
Member Since: 11/09/02
6 lifetime posts
Bvelectrical
Hey there,
I am considering purchasing a heater of of eaby the is rated at 4000 watts-208 single phase. What would the best wire be for this circuit. I assume I will just add a 220 circuit like for a stove or dryer?
thanks,
ty

Tom O

06:33AM | 11/11/02
Member Since: 09/17/02
487 lifetime posts
Presuming that you will be installing this heater in your house,the best wire size would be none at all, because you are not (hopefully) going to buy this heater. Your house wiring is 240 volts, the heater is 208 volts, an obvious mis-match and code violation.

Running this heater at 240 volts would cause the heat output to go up over 25%. This will, at best, cause the high limit cutout to keep turning this heater off because it is overheating. Not a good idea. Also, life of the element will be shortened considerably.

If you do have 208 volts available, #10 wire is what you're looking for.

Tom

[This message has been edited by Tom O (edited November 11, 2002).]

that guy ty

01:16PM | 11/11/02
Member Since: 11/09/02
6 lifetime posts
thanks Tom,
i what situation would 208 volts be used.... there is also one that is 480 volts. Are these commercial voltages?
thanks,ty

that guy ty

01:17PM | 11/11/02
Member Since: 11/09/02
6 lifetime posts
IN what situation...

Tom O

12:32PM | 11/12/02
Member Since: 09/17/02
487 lifetime posts
208 volts is commonly found in commercial areas such as stores & offices. It is 3phase.

480 can be found in large commercial installations and in industrial settings. It is usually 3 phase but there are a few areas where 240/480 single phase is available.

Tom

currentlimiter

07:51PM | 11/13/02
Member Since: 11/13/02
1 lifetime posts
There is an option available. However, the additional expense may not make the buy on E-bay look so attractive.

You could use a "Buck-boost" transformer, this would allow you to "buck" the 240VAC down to 212VAC, this should put you within the permissable operating range of the heater, however this should be verified with the mfgr. Would recommend that you contact an electrical contractor that specilizes in residential AND commercial, a "buck-boost" transformer is not something a typical residential electrician is familiar with.

Best recommendation is to purchase a UL listed heater rated to operate on a 120/240 single phase system.

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