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#42439 - 09/20/04 05:36 PM Murray Panels
wiremann-54270 Offline
Junior Member
Registered: 01/25/04
Posts: 9
Loc: Lebanon, PA USA
Just got back from a service call. H.O. had a 100amp Murray panel that was half under water this weekend, but main never tripped. In my mind it should have , as both bussbars were shorted together. Am I missing something here, or is Murray not as good as I once thought?
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#42440 - 09/20/04 07:53 PM Re: Murray Panels
Electric Eagle Offline
Member
Registered: 04/20/02
Posts: 928
Loc: Alpharetta, GA
Quote:
Am I missing something here, or is Murray not as good as I once thought?


I guess it depends on how good you thought Murray once was. I never thought it was any good. It is now part of Seimens, which is German for crap. We had a 20 amp Seimens breaker with a dead short on it, it would buzz for several seconds until the Cutler Hammer(CH line) 200 amp main would trip.
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#42441 - 09/20/04 08:11 PM Re: Murray Panels
wiremann-54270 Offline
Junior Member
Registered: 01/25/04
Posts: 9
Loc: Lebanon, PA USA
I never thought Murray was that great, but good for lower end equipment. So maybe I should suggest to the owners that I replace their panel with something else, like a Suquare D QO ? I still say the main should have tripped. That's the main thing. Now that I've had my hands in this liability is a concern. I have a goodly ammount of insurance, I just don't want to have to use it.
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#42442 - 09/20/04 08:23 PM Re: Murray Panels
PCBelarge Offline
Member
Registered: 06/08/03
Posts: 657
Loc: Dobbs Ferry, NY, USA
Don't blame the quality of the equipment for the overcurrent device not opening.

Water is not a good conductor of itself. If the water around that panel was pretty clean, then you can expect the device to not open.

Nema has a good document on their website dealing with water damaged equipment. www.nema.org then try the search for water damaged equipment.

Pierre
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#42443 - 09/20/04 08:23 PM Re: Murray Panels
Jim M Offline
Member
Registered: 08/10/01
Posts: 453
Loc: Chestertown, MD, USA
Please also see the post titled "panel under water". This may give you a better idea of what you are dealing with.
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#42444 - 09/20/04 08:52 PM Re: Murray Panels
Edward Offline
Member
Registered: 12/14/02
Posts: 309
Loc: California
in in basic operation.
If there is not enough current flow then the OCPD will not open.
If the OCPD is not opening that does not mean it is a bad equipment. It might simply be that there is not enought current to activate the OCPD.

That is my understanding.

Edward
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Edward
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#42445 - 09/21/04 12:08 PM Re: Murray Panels
SJT Offline
Member
Registered: 07/24/02
Posts: 242
Loc: PATCHOGUE, N.Y.
I think the breaker sees the water as a load, and not a direct short. I've been using Murray for a long time, with no problems. They've re-designed the panels. In industrial work, we use GE bolt on style breakers, and panels. How did the water get there? Water main or flood?
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#42446 - 09/21/04 12:15 PM Re: Murray Panels
wiremann-54270 Offline
Junior Member
Registered: 01/25/04
Posts: 9
Loc: Lebanon, PA USA
It was compliments of Ivan. A lot of things flooded here in PA. I just moved my office to my basement. I'm glad I checked it Saturday morning. My new computer was almost afloat.
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Patrick
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