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#194635 - 06/14/10 03:44 PM 6/3 NMWU amperage rating?  
mr_electrician  Offline
Member
Joined: Jun 2007
Posts: 106
London, Ontario
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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#194641 - 06/14/10 08:06 PM Re: 6/3 NMWU amperage rating? [Re: mr_electrician]  
mikesh  Offline
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Joined: Jun 2006
Posts: 613
Victoria, BC, Canada
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.


#194692 - 06/16/10 01:33 AM Re: 6/3 NMWU amperage rating? [Re: mikesh]  
twh  Offline
Member
Joined: Mar 2004
Posts: 903
Regina, Sask.
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.


#197138 - 11/10/10 10:00 PM Re: 6/3 NMWU amperage rating? [Re: twh]  
swoop  Offline
New Member
Joined: Oct 2010
Posts: 9
ontario
good luck finding a 55 amp breaker


#197160 - 11/12/10 03:19 PM Re: 6/3 NMWU amperage rating? [Re: swoop]  
mikesh  Offline
Member
Joined: Jun 2006
Posts: 613
Victoria, BC, Canada
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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