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Old 02-06-2009, 11:29 PM   #16
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More Clarification on Detached Garage Sub-Panel


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Originally Posted by 220/221 View Post
Still confused. Anybody??

B = No 20 amp two circuit installations allowed?

D = No 50 amp circuits allowed?

Your looking at disconnect requirements. Not feeder requirements.

Re-read 225.39

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Last edited by chris75; 02-06-2009 at 11:32 PM.
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Old 02-06-2009, 11:43 PM   #17
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More Clarification on Detached Garage Sub-Panel


Ok, so that refers you back to 220 III - which basically indicates sum of the loads as the deciding factor
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Old 02-06-2009, 11:57 PM   #18
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More Clarification on Detached Garage Sub-Panel


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Originally Posted by 220/221 View Post
The feeder disco would be at the main panel so.....?

Crap. If so, I've violated that more than a few times. For me, a typical sub would be #8's and a 50.

No. The OCPD (Over Current Protection Device) or your circuit breaker is at the main panel. This is sized to protect the wires. The Disconnect is installed at the detached structure and is basically just a simple switch to simply disconnect the service with one "switch". Most often a fused disconnect is used (circuit breaker). No matter whether you use a non-fused disconnect or a main breaker at the detached structure, point D is saying that the disconnect must be rated for NO LESS THAN 60 amps.

Your feeder could be 40 or 50 amps with #8 or #6 wire, but your disconnect at the detached structure by code must be rated for no less than 60 amps. Anything greater than the OCPD at the source is just simply a disconnect and nothing more, since an overload would trip the OCPD in the main panel.
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Old 02-08-2009, 01:06 PM   #19
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More Clarification on Detached Garage Sub-Panel


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Originally Posted by Stubbie View Post
Ground rods provide no path for the egc they provide a path for high voltage.. high current.. events like lighting that are at levels way higher than residential voltages. It takes those kinds of events to get earth to be forced, if you will into, a conductor of appreciable amounts of current.
Damn! You know how there's that moment when you get it (um, the lightbulb comes on, since this is an electrical discussion) and then you look back and say "How did I have a problem with that before, it's so simple"... Well, that line (and the rest of your post) was that lightbulb! Damn that seems so obvious now.

Appreciate the help!

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