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Joined: Mar 2003
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What can a 15 amp breaker hold (as far as watts). Also 20 amp--30 amp--and 40 amp. Heck we are in great debate over this issue. It's in the book, but many people have their own ideas. I know that we are to use only 80% of it's actual capacity. Example: Lets say a 15 amp breaker can handle 1800 watts max. I would then use only 80% of that capacity. So: 1440 watts would be the most I would put on that one circuit. Would love to hear you input. Heck, debate me down baby! LOL
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Joined: Feb 2002
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When you say, "What can a 15 amp circuit breaker hold?" What do you mean? What it REALY can hold? Or what you install on it? Most electricians use the 80% rule. (I believe)A 15 amp breaker can hold more than 15 amps, this way it can be used for the start up of motors and HVAC equipment.
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Joined: Apr 2002
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Now we are asking a "debate" question..... IF it is an FPE 15 amp breaker (stab-loc) it may "hold" at 100 amps for a few.....it also may hold at 35 for a while...... A 15 will trip at the rated current based on the time curve calculated by the factory.
Harold is correct that a cb can "hold" to allow motor start-up, that is also based on the time curve.
You can obtain time curve info from the mfg's, and there is a lot of time curve info at Bussman Fuses.
John
The 80% rule is used.
John
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Joined: Mar 2003
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To clarify what I meant (sorry): What can a 15 amp breaker hold on a circuit being ran for a single family home dewelling. How many openings?
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Joined: Jan 2003
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A 15 amp breaker can be loaded up to 15 amps for Non-continuous loads.
For continuous loads no more then 12 amps (80%)
The code does not use 80% as the terminology they have you calculate a continuous load circuit at 125%, but the result is the same
Bob Badger Construction & Maintenance Electrician Massachusetts
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Joined: Mar 2001
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Contrary to popular belief, the NEC does not limit the number of receptacle outlets on a residential circuit. However, many use the 180 VA rule which will result in 8-10 outlets (dpeending on if you apply the 80% rule) on a 15 amp ckt. The other side of the argument is that the more receptacles you install, the less likely extension cords will be used.
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Joined: Mar 2003
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I believe iwire has the correct answer. 15 amps for non continious, and 12 for continious.
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Joined: Dec 2002
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{QUOTE]DBC1 --I believe iwire has the correct answer. 15 amps for non continious, and 12 for continious.{/QUOTE] This is residential right ? where is there a continuous load...? by definition continuous load is 3hours or more. Just askin'
WOC
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Joined: Aug 2002
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Whatever happened to 3 watts SQ/FT for receptacle and lighting loads in SFR's? bob
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Joined: Mar 2003
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to answer your question Wocolt. Yes, it's residential. Thanks for the responses!
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