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


Joe Tedesco, NEC Consultant
2017 / 2014 NEC & Related Books and Study Guides
Re: Recycled Image from the past! #104984 03/14/04 03:57 PM
Joined: Oct 2003
Posts: 289
:
:andy: Offline
Member
how did they manage to overheat _all_ neutrals?

Re: Recycled Image from the past! #104985 03/17/04 11:52 AM
Joined: Mar 2004
Posts: 76
M
Megawatt Offline
Member
How about a grounding bushing on that RGS entering the panel ??

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

What is this panel feeding?

Re: Recycled Image from the past! #104987 03/17/04 04:17 PM
Joined: Nov 2001
Posts: 745
M
mamills Offline
Member
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)

Re: Recycled Image from the past! #104988 03/20/04 08:01 AM
Joined: Jun 2003
Posts: 681
P
PCBelarge Offline
Member
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
Re: Recycled Image from the past! #104989 03/20/04 11:01 PM
Joined: Oct 2003
Posts: 147
C
crash Offline
Member
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.

Re: Recycled Image from the past! #104990 04/11/04 05:46 PM
Joined: Aug 2003
Posts: 1,374
R
Ryan_J Offline
Moderator
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
Re: Recycled Image from the past! #104991 04/30/04 11:01 AM
Joined: Apr 2004
Posts: 810
Theelectrikid Offline
Member
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?
Re: Recycled Image from the past! #104992 04/30/04 12:23 PM
Joined: Feb 2004
Posts: 1,436
Lostazhell Offline
Member
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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