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6/3 NMWU amperage rating? #194635 06/14/10 03:44 PM
Joined: Jun 2007
Posts: 106
M
mr_electrician Offline OP
Member
Correct me if I am wrong but since NMWU has a 60 degree rating, then #6NMWU is only good for 55Amps unless it is part of a residential service? (T.2 of the OESC) I am guessing that a sub panel to the garage would not fall under this classification therefore limiting my amperage rating to 55amps and not 60?


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Re: 6/3 NMWU amperage rating? [Re: mr_electrician] #194641 06/14/10 08:06 PM
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mikesh Offline
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I think that as long as the Garage is a residential garage and part of a single residential unit, then 60 amps would apply. A residential Garage is not a continuous load and residential services are non continuous loads.
A duplex with a single joint use garage might not qualify.

Talk to the local authority but I think we would allow the greater ampacity as long as the Volt drop does not get rediculous.

Re: 6/3 NMWU amperage rating? [Re: mikesh] #194692 06/16/10 01:33 AM
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twh Offline
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Isn't it a 55 amp feeder fused at 60 amps per Table 13? The differences are that if the load in the garage is greater than 55 amps, the wire is too small; and, the location of the panel in the garage isn't restricted like a residential service.

Re: 6/3 NMWU amperage rating? [Re: twh] #197138 11/10/10 10:00 PM
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swoop Offline
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good luck finding a 55 amp breaker

Re: 6/3 NMWU amperage rating? [Re: swoop] #197160 11/12/10 03:19 PM
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mikesh Offline
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Twh
Yes you make the most important point. As long as the calculated load is less than 55 amps then the #6 is good and table 13 would allow a 60 amp breaker.


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