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Joined: Oct 2000
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[Linked Image]


Joe Tedesco, NEC Consultant
2017 / 2014 NEC & Related Books and Study Guides
Joined: Oct 2003
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how did they manage to overheat _all_ neutrals?

Joined: Mar 2004
Posts: 76
M
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How about a grounding bushing on that RGS entering the panel ??

Joined: Jan 2004
Posts: 615
J
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Is this the result of harmonic currents?

What is this panel feeding?

Joined: Nov 2001
Posts: 745
M
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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)

Joined: Jun 2003
Posts: 681
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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
Joined: Oct 2003
Posts: 147
C
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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.

Joined: Aug 2003
Posts: 1,374
R
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
Joined: Apr 2004
Posts: 811
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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?
Joined: Feb 2004
Posts: 1,437
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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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