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Old 10-10-2011, 10:58 PM   #1
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Garage heater


Want to run 220 out to my garage to use this heater http://www.ebay.com/itm/160522003371...84.m1423.l2648 just wanted to know if I can use 14g wire safely or should I use 12. Thanks.

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Old 10-10-2011, 11:04 PM   #2
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the most you are allowed to put on a 14 gauge is 15 amps. The heater says 20 amps. Therefore, you will need 12 gauge

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Old 10-10-2011, 11:24 PM   #3
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Attached or detached garage?
Do you have a feed to the garage now?
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Old 10-10-2011, 11:30 PM   #4
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minimum #10
so 10/2 wire would be needed and a 30 amp breaker
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Old 10-11-2011, 01:07 AM   #5
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Quote:
Originally Posted by awdblazer View Post
minimum #10
so 10/2 wire would be needed and a 30 amp breaker
The heater is 4000 watts which equals 16.67 amps. What would you want a 30 amp breaker on a 17 amp appliance?
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Old 10-11-2011, 06:26 AM   #6
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Quote:
Originally Posted by bluebird5 View Post
The heater is 4000 watts which equals 16.67 amps. What would you want a 30 amp breaker on a 17 amp appliance?
Here is why.

424.3 Branch Circuits.
(A) Branch-Circuit Requirements. Individual branch circuits
shall be permitted to supply any volt-ampere or wattage
rating of fixed electric space-heating equipment for
which they are rated.
Branch circuits supplying two or more outlets for fixed
electric space-heating equipment shall be rated 15, 20, 25,
or 30 amperes. In other than a dwelling unit, fixed infrared
heating equipment shall be permitted to be supplied from
branch circuits rated not over 50 amperes.
(B) Branch-Circuit Sizing. Fixed electric space-heating
equipment and motors shall be considered continuous load.


17 x 1.25 - 21.25. too much for a twenty amp circuit. Even using 16.67 x 1.25 = 20.8375.
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Last edited by Jim Port; 10-11-2011 at 06:28 AM.
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Old 10-11-2011, 09:48 AM   #7
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also those heaters are illegal for permanent use, but most people don't care
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Old 10-11-2011, 02:42 PM   #8
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Quote:
Originally Posted by Jim Port View Post
(B) Branch-Circuit Sizing. Fixed electric space-heating equipment and motors shall be considered continuous load.
It's cord-and-plug connected, so not "fixed". I'd say it's a non-continuous load.
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Old 10-11-2011, 04:55 PM   #9
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Originally Posted by mpoulton View Post
It's cord-and-plug connected, so not "fixed". I'd say it's a non-continuous load.
i agree with him, or else we could not plug 1500w portable space heater on 15A circuit (max 1440w for 80%). it is not a continuous load
i even use some 4800w ones on 20A breakers without problem for 15 years
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Old 10-11-2011, 04:57 PM   #10
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Quote:
Originally Posted by jbfan View Post
Attached or detached garage?
Do you have a feed to the garage now?
Detached garage. Yes there is a feed, but only 14/3
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Old 10-11-2011, 04:59 PM   #11
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Thanks for the replies.
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Old 10-11-2011, 05:05 PM   #12
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Quote:
Originally Posted by gmbwrenchn View Post
Detached garage. Yes there is a feed, but only 14/3
Since the garage has a feed, you can not run another feed.

You would need to increase the current feed and install a sub panel to use this heater.
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Old 10-11-2011, 05:32 PM   #13
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With that feeder you will need a smaller heater.

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