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#194635 - 06/14/10 12:44 PM 6/3 NMWU amperage rating?
mr_electrician Offline
Member

Registered: 06/22/07
Posts: 106
Loc: 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 05:06 PM Re: 6/3 NMWU amperage rating? [Re: mr_electrician]
mikesh Offline
Member

Registered: 06/07/06
Posts: 614
Loc: 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.

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#194692 - 06/15/10 10:33 PM Re: 6/3 NMWU amperage rating? [Re: mikesh]
twh Offline
Member

Registered: 03/11/04
Posts: 898
Loc: 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.

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#197138 - 11/10/10 06:00 PM Re: 6/3 NMWU amperage rating? [Re: twh]
swoop Offline
New Member

Registered: 10/24/10
Posts: 9
Loc: ontario
good luck finding a 55 amp breaker

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#197160 - 11/12/10 11:19 AM Re: 6/3 NMWU amperage rating? [Re: swoop]
mikesh Offline
Member

Registered: 06/07/06
Posts: 614
Loc: 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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