ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
Fuse blower plug?
by HotLine1 - 08/20/19 01:50 PM
100 year old Light Bulb
by HotLine1 - 08/20/19 01:26 PM
Forum Updates Coming Soon.
by Admin - 08/18/19 01:55 PM
Anybody Remember this?
by Bill Addiss - 08/17/19 09:07 PM
1897 paper on 110-220 incandescent lamps
by ghost307 - 08/15/19 10:31 AM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 5 guests, and 11 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Main lug panels #217419 07/26/16 02:20 PM
Joined: Oct 2002
Posts: 830
S
sparkync Offline OP
Member
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
Re: Main lug panels [Re: sparkync] #217420 07/26/16 02:59 PM
Joined: May 2005
Posts: 984
G
ghost307 Offline
Member
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
Re: Main lug panels [Re: sparkync] #217421 07/27/16 03:48 AM
Joined: Jul 2004
Posts: 9,382
G
gfretwell Offline
Member
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
Re: Main lug panels [Re: sparkync] #217422 07/27/16 04:30 PM
Joined: Apr 2002
Posts: 7,105
HotLine1 Offline
Member
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
Re: Main lug panels [Re: sparkync] #217425 07/27/16 06:18 PM
Joined: Jul 2004
Posts: 9,382
G
gfretwell Offline
Member
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
Re: Main lug panels [Re: sparkync] #217428 07/28/16 10:26 PM
Joined: Apr 2002
Posts: 7,105
HotLine1 Offline
Member
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
Re: Main lug panels [Re: sparkync] #217429 07/29/16 04:07 AM
Joined: Jul 2004
Posts: 9,382
G
gfretwell Offline
Member
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

Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
AllClear
AllClear
Belmond Iowa US
Posts: 44
Joined: August 2005
Show All Member Profiles 
Top Posters(30 Days)
Admin 21
GeneSF 8
Popular Topics(Views)
257,886 Are you busy
193,622 Re: Forum
183,239 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3