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 Derating service entrance conductors
#52662
06/01/05 11:32 PM
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Joined: Nov 2004
Posts: 53
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When installing a multigang meter socket is there deration allowed for the service entrance conductors? Thanks
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Re: Derating service entrance conductors
#52663
06/02/05 01:00 AM
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Joined: Oct 2004
Posts: 72
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I'm trying to think why you would have more than three current carrying conductors in a service enterance.
the only thing I could think of is if it were paralleled.
but still in parallel it's like their the same conductor.
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Re: Derating service entrance conductors
#52664
06/02/05 01:24 AM
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Joined: Feb 2003
Posts: 939
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the biggest issuse is busbar of multi meter socket set up is the rating of main busbar feed to all meters you have to watchout the rating i ran into few of that for incomming service cables and out going cables most meter manufacter will list a warning there
Merci, Marc
Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)
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Re: Derating service entrance conductors
#52665
06/02/05 08:30 AM
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Joined: Nov 2004
Posts: 53
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What I meant was, if you have say a four gang setup with 200+200+200+200 amps do the service entrance conductors need to have an ampacity of 800 amps in a residential setting?
Thanks
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Re: Derating service entrance conductors
#52666
06/02/05 09:48 AM
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Joined: Feb 2005
Posts: 361
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No, the sum of the metering doesn't neccessarrily need to equal the whole of the service.
See:
Annex D ~ Example D4(a) Multifamily Dwelling; Example D4(b) Optional Calculation for Multifamily Dwelling
The Annex refers back to each applicable article,ie T220.10
A two-family home might require a house panel(40A), an 100A panel(1st floor) and a 60A panel (2nd flr) - but the service might be 150A...depending on the calculated load.
~~ CELTIC ~~
...-= NJ =-...
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