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Old 06-07-2011, 07:18 PM   #1
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Backfed Main Breaker Space - what would I do with it?


This is a subpanel in my workshop - has a space noted for a backfed main breaker. How would this be utilized?

The sticker is located just below the empty space in the lower left of the panel.
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Old 06-07-2011, 07:23 PM   #2
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Backfed Main Breaker Space - what would I do with it?


it appears the breaker bottom right is a 100A 2 pole, ... that should be your 'main breaker' just installed on the wrong side works on the same principal, but it looks like the left side has the hold down kit.

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Old 06-08-2011, 12:40 AM   #3
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Backfed Main Breaker Space - what would I do with it?


Quote:
Originally Posted by Techy View Post
it appears the breaker bottom right is a 100A 2 pole, ... that should be your 'main breaker' just installed on the wrong side works on the same principal, but it looks like the left side has the hold down kit.

Yes, bottom right is 100a 2 pole main breaker acting as the disconnect. As for being installed on the wrong side, that's the way it came installed out of the box if I recall correctly.

When you say works on the same principle, that's what I was wondering - why would the lower left be called out specifically as backfed space?

Another picture -
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Last edited by vsheetz; 06-08-2011 at 02:14 AM.
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Old 06-08-2011, 06:54 AM   #4
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Backfed Main Breaker Space - what would I do with it?


a plug on backfed main breaker requires a 'hold down kit', it looks like there is a 'hold down kit' installed in the position it calls out
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Old 06-08-2011, 09:05 AM   #5
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Backfed Main Breaker Space - what would I do with it?


Is that a hold-down kit on the right side, and is currently holding the 100A-2 pole?

It’s hard to tell from the pic’s, but a difference I might be seeing is it looks like the left side might be bonded to the tub, and the right side might not be.
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Old 06-08-2011, 10:28 AM   #6
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Backfed Main Breaker Space - what would I do with it?


See that L-shaped metal bracket sticking out to the left of the current main breaker? It looks like if the breaker were in the left position instead, that bracket would engage the notch in the end of the breaker to hold it down.

That breaker should be moved to the designated position, and it looks like you have slack in the wire to do so. The reason code requires some means of holding down a backfed main breaker is so that there won't be a breaker with energized bus clips flopping around if it is accidentally or intentionally removed from the bus.
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Old 06-08-2011, 12:19 PM   #7
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Backfed Main Breaker Space - what would I do with it?


In the first picture, that bars looks to be moved more to the right side of the panel.
That bar is used to prevent breakers from being installed behind the main breaker.
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Old 06-12-2011, 04:10 PM   #8
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Backfed Main Breaker Space - what would I do with it?


Thanks all to explaining and pointing out what needed correction. Today I moved the main breaker and implemted the hold-down - so it is now as it should be.

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