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#217419 07/26/16 02:20 PM
Joined: Oct 2002
Posts: 830
S
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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

2017 / 2014 NEC & Related Books and Study Guides
Joined: May 2005
Posts: 984
G
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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
Joined: Jul 2004
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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
Joined: Apr 2002
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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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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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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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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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