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Main lug panels
#217419
07/26/16 02:20 PM
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Joined: Oct 2002
Posts: 830
OP
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Where in the code does it explain about using main lug panels. I'm going about 220ft. from a main breaker panel, feeding a 100 amp panel. Normally I would use a main breaker panel anyway, but so far I don't seem to find one that fits my need. thanks
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Re: Main lug panels
[Re: sparkync]
#217420
07/26/16 02:59 PM
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Joined: May 2005
Posts: 984
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I don't think it does. I always like using a panel with a Main because it reduces the temptation to work it hot when someone doesn't want to walk to the feeder breaker and turn it off...but I don't think there's a requirement for a main.
Ghost307
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Re: Main lug panels
[Re: sparkync]
#217421
07/27/16 03:48 AM
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Joined: Jul 2004
Posts: 9,577
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A main is only required if it is in another building and they do not use the 225.32 ex1 excuse "documented safe switching procedures".
When they are not within sight, I am not really happy but it is legal. Good documentation of where the feeder breaker is should be on the MLO.
Greg Fretwell
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Re: Main lug panels
[Re: sparkync]
#217422
07/27/16 04:30 PM
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Joined: Apr 2002
Posts: 7,238
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Greg: I agree with you.
How do you feel IF the sub has only 4 single pole branches?
Think the old six switch rule!
John
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Re: Main lug panels
[Re: sparkync]
#217425
07/27/16 06:18 PM
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Joined: Jul 2004
Posts: 9,577
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That does not really address the hot bus but I suppose there are still hot components in a panel with a main. (Unless you are in Canada where they have a cover over the main lugs from what I understand)
Greg Fretwell
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Re: Main lug panels
[Re: sparkync]
#217428
07/28/16 10:26 PM
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Joined: Apr 2002
Posts: 7,238
Member
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Greg:
IMHO, the 'six switch rule' was OK back when there were limited circuits compared to today.
On the commercial side, the $$$ saved by eliminating the main, catches up when the buildings are renovated. Quite a few show up each year.
John
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Re: Main lug panels
[Re: sparkync]
#217429
07/29/16 04:07 AM
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Joined: Jul 2004
Posts: 9,577
Member
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I understand that it is not a huge hazard. I suppose I was just saying identifying where it comes from is a good idea for that time when you are working on something more complicated than a branch circuit.
Greg Fretwell
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