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#104983 - 03/13/04 02:05 PM Recycled Image from the past!
Joe Tedesco Offline

Registered: 10/07/00
Posts: 3325
Loc: Boston, Massachusetts USA
Joe Tedesco, NEC Consultant

2014 / 2011 NEC & Related Books and Study Guides
#104984 - 03/14/04 12:57 PM Re: Recycled Image from the past!
:andy: Offline

Registered: 10/18/03
Posts: 272
Loc: Germany
how did they manage to overheat _all_ neutrals?

#104985 - 03/17/04 08:52 AM Re: Recycled Image from the past!
Megawatt Offline

Registered: 03/11/04
Posts: 74
Loc: Lexington,Ky, USA
How about a grounding bushing on that RGS entering the panel ??

#104986 - 03/17/04 12:43 PM Re: Recycled Image from the past!
Jps1006 Offline

Registered: 01/22/04
Posts: 609
Loc: Northern IL
Is this the result of harmonic currents?

What is this panel feeding?

#104987 - 03/17/04 01:17 PM Re: Recycled Image from the past!
mamills Offline

Registered: 11/30/01
Posts: 739
Loc: Wharton, Texas, USA
Looking closely at the several neutral busses here, it appears that the burn/overheat marks are on the conductors which are attached to the top-most buss (the one closest to the breakers). I wonder if a poor connection exists where the two phillips screws connect this buss to the rest of the neutral assembly, causing this entire buss to heat up?

Mike (mamills)

#104988 - 03/20/04 05:01 AM Re: Recycled Image from the past!
PCBelarge Offline

Registered: 06/08/03
Posts: 657
Loc: Dobbs Ferry, NY, USA
Something here is definitely wrong. Not only the neutral connections to the bus, but even along the length of some of the conductors, it is discolored. HMMMM!!
I am curious what is causing this.

Pierre Belarge

#104989 - 03/20/04 08:01 PM Re: Recycled Image from the past!
crash Offline

Registered: 10/21/03
Posts: 130
Loc: Calgary Canada
It looks like there are several ground wires terminated on the neutral buss, including the ground wire from the UF cable that was in the same conduit as the feeders.

#104990 - 04/11/04 03:46 PM Re: Recycled Image from the past!
Ryan_J Offline

Registered: 08/19/03
Posts: 1355
Loc: West Jordan, Utah, USA
I also was thinking triplen harmonics, but I assume this is a dwelling, and circuit 3 is a GFCI. What non-linear load(s) would you have on a GFCI circuit?
Ryan Jackson,
Salt Lake City

#104991 - 04/30/04 09:01 AM Re: Recycled Image from the past!
Theelectrikid Offline

Registered: 04/30/04
Posts: 854
Loc: Levittown, PA
The overheated neutral bus bar and discolored wires aren't the only problems...

Where the heck's the main breaker?
Is there anyone on board who knows how to fly a plane?

#104992 - 04/30/04 10:23 AM Re: Recycled Image from the past!
Lostazhell Offline

Registered: 02/21/04
Posts: 1248
Loc: Bakersfield, CA (Originally Or...
First off, Welcome to ECN!

Chances are, the main overcurrent protection (breaker) is at the source for this panel.. In the eastern side of the USA, it seems to be popular, if not universal to have the power co.'s meter outside with a main disconnect.. This in-turn feeds to a distribution panel elsewhere.. (usually a garage or basement, which is what you see here... Protection from overloads for this type of panel would be at the source it was powered from.. (Main disconnect, branch circuit feed from another panel, etc.)


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