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#91561 01/23/05 09:43 AM
Joined: Jan 2004
Posts: 1,507
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Member
I wonder why more installers don't install the panel with the Main on the bottom. Next time you have a situation where the meter is outside and back to back with the breaker panel look at the panel and see if it is universal with respects to bottom fed or top fed. It's a lot easier to install and you won't fill up the gutter space with Service Entrance conductors.


George Little
2017 / 2014 NEC & Related Books and Study Guides
#91562 01/23/05 10:20 AM
Joined: Jan 2003
Posts: 4,391
I
Moderator
I do all I can to enter the enclosure where the terminals are, many of the panels I receive can be mounted either way. If it is easer to have the main at the bottom I will do that.

Quote
It's a lot easier to install and you won't fill up the gutter space with Service Entrance conductors.

I hate seeing the gutters filled up with service or feeder conductors.

Check this one out.

[Linked Image]

More pictures here;
https://www.electrical-contractor.net/ubb/Forum5/HTML/000532.html

Bob

[This message has been edited by iwire (edited 01-23-2005).]


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#91563 01/23/05 11:09 AM
Joined: Jun 2003
Posts: 681
P
Member
How about the bending radius? If you are using 4/0 aluminum for a 200 amp panel and you enter the panel enclosure from the back?

Will this meet the minimum bending radius for a standard 200 amp panelboard enclosure?

Pierre


Pierre Belarge
#91564 01/23/05 11:23 AM
Joined: Feb 2003
Posts: 169
R
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Switch boards are not defined in the NEC article 100, all though panel boards are.
There is no clear distinction between the two.

With that said it seams to me that when you run the service conductors up the side of the panel, and they are not terminating on that side, it violates 408.3(A)(3)

#91565 01/23/05 11:55 AM
Joined: Jan 2003
Posts: 4,391
I
Moderator
Article 100 2002 NEC
Quote
Switchboard. A large single panel, frame, or assembly of panels on which are mounted on the face, back, or both, switches, overcurrent and other protective devices, buses, and usually instruments. Switchboards are generally accessible from the rear as well as from the front and are not intended to be installed in cabinets.

You will not see a switchboard in a dwelling unit (most times [Linked Image])

A switchboard may have clearly defined vertical sections, a panel does not.


Bob Badger
Construction & Maintenance Electrician
Massachusetts
#91566 01/23/05 12:31 PM
Joined: Feb 2003
Posts: 169
R
Member
Thanks Bob:

I see where I missed switchboard, I didn't look far enough.

#91567 01/23/05 12:43 PM
Joined: Feb 2003
Posts: 169
R
Member
I have to agree with Pierre that the wire bending space does not fit.
Also 314.28 has been thrown out the window

#91568 01/23/05 12:57 PM
Joined: Jan 2005
Posts: 315
L
Member
Whats up with all those tie wraps ?
I dislike seeing tie wraps in a panel - for 1 reason - HEAT !
When I get into a panel and see this I take my wire cutters and remove them. Most of the time I find heat marks on the conductors under the ties. I tell my apprentices that this practice creates a
" future failure "


Be Smart and Do It Right

#91569 01/25/05 11:33 PM
Joined: Mar 2001
Posts: 345
T
Member
George Little / Member posted 01-23-2005 08:43 AM
Quote
I wonder why more installers don't install the panel with the Main on the bottom. Next time you have a situation where the meter is outside and back to back with the breaker panel look at the panel and see if it is universal with respects to bottom fed or top fed. It's a lot easier to install and you won't fill up the gutter space with Service Entrance conductors.
Man did this thread ever get side tracked.

I have had inspectors object to the two more feet of SEC that it takes to reach the bottom of the cabinet and technically they are right in that it is not "nearest the point of entry."

In CSA excepted panels there is a dead front over the line terminals so you have to run the supply conductors in through that end of the cabinet. The dead front also prevents you from running branch circuit conductors out of that end of the cabinet. On one old panel type I saw on the air force bases I served on as a lad the cover fasteners were studs with wing nuts and the panel cover would not come off if the main breaker was in the on position. I sometimes think that would be a good technique to adopt in the US for all residential panels when coupled with a Canadian style dead front.
--
Tom H

[This message has been edited by tdhorne (edited 01-25-2005).]


Tom Horne

"This alternating current stuff is just a fad. It is much too dangerous for general use" Thomas Alva Edison
#91570 02/03/05 01:20 AM
Joined: Dec 2001
Posts: 270
E
Member
Re Russ M's comment: "Also 314.28 has been thrown out the window"
314.28 applies to junction or pull boxes, not panelboards, right?
Re Pierre's comment: "How about the bending radius? If you are using 4/0 aluminum for a 200 amp panel and you enter the panel enclosure from the back?
Will this meet the minimum bending radius for a standard 200 amp panelboard enclosure?"

Does table 312.6(A) apply to the front to back distance?
The note in the bottom of the table only mentions measuring in a straight line from the end of the terminal lug (which end? where the wire butts up in the barrel or at the open end of the lug?) to the wall of the panel.

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