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#104983 - 03/13/04 06:05 PM Recycled Image from the past!  
Joe Tedesco  Offline
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
[Linked Image]


Joe Tedesco, NEC Consultant

2017 / 2014 NEC & Related Books and Study Guides

#104984 - 03/14/04 04:57 PM Re: Recycled Image from the past!  
:andy:  Offline
Member
Joined: Oct 2003
Posts: 289
Germany
how did they manage to overheat _all_ neutrals?


#104985 - 03/17/04 12:52 PM Re: Recycled Image from the past!  
Megawatt  Offline
Member
Joined: Mar 2004
Posts: 76
Lexington,Ky, USA
How about a grounding bushing on that RGS entering the panel ??


#104986 - 03/17/04 04:43 PM Re: Recycled Image from the past!  
Jps1006  Offline
Member
Joined: Jan 2004
Posts: 615
Northern IL
Is this the result of harmonic currents?

What is this panel feeding?


#104987 - 03/17/04 05:17 PM Re: Recycled Image from the past!  
mamills  Offline
Member
Joined: Nov 2001
Posts: 745
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? [Linked Image]

Mike (mamills)


#104988 - 03/20/04 09:01 AM Re: Recycled Image from the past!  
PCBelarge  Offline
Member
Joined: Jun 2003
Posts: 681
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


Pierre Belarge

#104989 - 03/21/04 12:01 AM Re: Recycled Image from the past!  
crash  Offline
Member
Joined: Oct 2003
Posts: 147
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 06:46 PM Re: Recycled Image from the past!  
Ryan_J  Offline
Moderator
Joined: Aug 2003
Posts: 1,374
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 12:01 PM Re: Recycled Image from the past!  
Theelectrikid  Offline
Member
Joined: Apr 2004
Posts: 810
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 01:23 PM Re: Recycled Image from the past!  
Lostazhell  Offline
Member
Joined: Feb 2004
Posts: 1,431
Bakersfield, CA (Originally Or...
Theelectrikid:
First off, Welcome to ECN! [Linked Image]

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.)

-Randy


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