splicing of 500MCM

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Re: splicing of 500MCM

Yes as I recently found out so the old no such thing as a 90c lug has fallen by they wayside over 100 amps....so the answer is use 500mcm @ the 90c rating in rated lugs and extend your feeders....
This is way I like this forum always learning something
craig
 
Re: splicing of 500MCM

Originally posted by websparky:
He has told me that any gear now being manufactured above 100 amps has 90c rated lugs.
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Please ask him which manufacturers :eek:
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Seimens, and Square D are the only two I asked about...Remember this is still unconfirmed I have e-mails out to the engienners at both companies
craig
 
Re: splicing of 500MCM

Even if the lugs are listed for 90?C that does not mean that the termination and the equipment is listed for 90?C.
Don
 
Re: splicing of 500MCM

A.M.P. (American Midwest Power) Does make services rated for 90c terminations. They are able to make this fly by increasing the buss size to disapate the additional heat.
 
Re: splicing of 500MCM

If it is UL listed gear with 90c lugs wouldn't that included all components of the switch gear?
 
Re: splicing of 500MCM

If it is UL listed gear with 90c lugs wouldn't that included all components of the switch gear?
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No. Many wire connectors are suitable for use at 90?C, but often the equipment that the wire connectors are attached to is not listed for the higher temperature. You can't just look at the temperature rating of the wire connector, you have to look at the other information that has been provided by the equipment manufacturer.
Don
 
Re: splicing of 500MCM

I called Square D, Eaton and Seamens. All three gave me same answer: their equipment is rated for 75C. Recently I took NEC training course: equipment over 100A: use conductor sizing for 75C rated and equipment below 100A: use conductor 60C rated.
 
Re: splicing of 500MCM

Maybe I am missing something in the original posters question, but are these conductors not paralleled? Are there not rules for this installation that say things like conductors have to be the same size and have the same insulation material. 310.4
 
Re: splicing of 500MCM

caj1962,
As long as you do the same thing to each of the conductors that make up a phase there is nothing in 310.4 that would prevent changing the wire size at a splice point.
Don
 
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