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#102917 11/30/01 08:57 AM
Joined: Oct 2000
Posts: 2,749
[Linked Image]

What New (2002 NEC) and existing rules are being violated here?

Joe Tedesco, NEC Consultant
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#102918 11/30/01 11:15 AM
Joined: Nov 2001
Posts: 745
Hello from Wharton, TX. I must admit to being nervous about this being my first post. I have been looking at ECN for some time now and have found it fascinating. Unfortunately, I am not in the electrical profession (I am an Audio Visual Coordinator at a local Community College), but I am very interested in this field and have learned a lot from this website.
Regarding the photo, and not knowing any more than I do, the first problem that seems to stick out in my mind are the two white wires under the single lug, which I know is a violation. What is curious is the fact that this was unnecessary, given the large number of empty lugs nearby.

#102919 11/30/01 01:29 PM
Joined: Oct 2000
Posts: 2,749
The new 2002 NEC rule is 408.21 Grounded Conductor Terminations.

Each grounded conductor shall terminate within the panelboard in an individual terminal that is not also used for another conductor.

Exception: Grounded conductors of circuits with parallel conductors shall be permitted to terminate in a single terminal if the terminal is identified for connection of more than one conductor.

[This message has been edited by Joe Tedesco (edited 11-26-2002).]

Joe Tedesco, NEC Consultant
#102920 11/30/01 05:58 PM
Joined: Aug 2001
Posts: 7,520

Don't be nervous about jumping in. Everyone here is friendly and willing to answer any questions they can. (And I'm a foreigner who has asked some questions that might be obvious to the others!)


What's the busbar on the right with no connections to it? Is it just an extra neutral bar?

#102921 11/30/01 06:13 PM
Joined: Oct 2000
Posts: 4,116
Likes: 4

That looks like another Neutral bar. It's the one that a thoughtful Electrician would have used first Filling the upper bar often blocks or makes terminating more difficult on the lower one when things start getting crowded.


#102922 11/30/01 09:09 PM
Joined: Aug 2001
Posts: 7,520
Thanks Bill.

I thought it most likely was another neutral bar. We just seldom have two separate neutral busbars in panels here, unless it's a split panel with different mains.

#102923 12/01/01 12:09 AM
Joined: Nov 2001
Posts: 20
The two larger neutrals look as though they were installed after the smaller ones.

On both bars the unused terminals are in their factory positions, except for the bottom terminal on the left. It has been backed out as though the electrician planned to use it, but then didn't for some reason.

I suspect that the larger neutral which is doubled up with the small one was trimmed off too short to reach any of the higher terminals, and that there is something wrong with the bottom left terminal, stripped perhaps. Those aluminum neutral bars aren't the greatest.

The electrician should have tied it to the bar on the right, but that would have been a little awkward given that the other neutrals were already installed on the left bar.


#102924 12/01/01 09:27 PM
Joined: Oct 2000
Posts: 2,723
Likes: 1
Broom Pusher and
When I make up a Panel with stacked Buses for the Grounded Conductors [such as this Panel - which looks like a Square D NQOx type Panel to me..], I will land the Conductors on the other Bus, just to keep the "First" Bus available for the next guy. Quite the opposite of what is shown in this image.

That way, the Conductors can be landed without having to weave them under the first Bus, plus it just seems like a nice thing to do.

Anyone else do this???

P.S. Unless someone is holding a gun to my head, I would not double-up conductors like this, when there's so many free landings available!!!


Welcome aboard!!!
Feel free to contribute anything you can - we all benifit from each other.
You have found a site with a vast amount of information and people who love answering questions! It just might take a few days to get used to the "ECN Slang", or the "Inside Jokes" we use here [Linked Image]
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Scott " 35 " Thompson
Just Say NO To Green Eggs And Ham!
#102925 12/02/01 09:13 PM
Joined: Dec 2001
Posts: 1
Junior Member
I agree looks like a QO. The upper two bars are factory. The lower was added. Why?

#102926 12/02/01 09:32 PM
Joined: Nov 2001
Posts: 42
The real problem here is the inconcideration
for future electricians and common sense.I come across this stuff all the time and its sometimes IMPOSSIBLE ti install the neutral in the proper place because there is an empty neutral bar covered with the original neutrals thus making it easier to double up the originals than try to get to the empty lugs.. The codebook should include this..

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