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james582 07-28-2010 04:43 PM

what gauge wire
 
hi i am wiring my detached garage (in canada) i am puting a 100 amp sub panel in the garage. i was told i need a smaller breaker in the main panel so i am using a 60 amp d.p.b. in the house witch should be sufficent for the garage. i have a run of a little less than 35 feet i was told i need to use #6/3 underground wire is this corect or can i use #8 or #10 i am running it in conduit underground

darren 07-28-2010 05:02 PM

#6 RW90(red, black, white, they have to be these colours you can't retape them) and a #10 green insulated ground conductor. You are best to install individual conductors if you have a conduit. If your going to use a cable you will have to use 6/3 NMWU.

james582 07-28-2010 09:36 PM

thank you verry fast and informitave:thumbsup:

james582 07-28-2010 09:45 PM

last minute thought what size conduit should i use if im using plastic conduit

secutanudu 07-29-2010 08:01 AM

If you use individual THWN wires (three #6 and one #10), according to this raceway fill calculator, you need 3/4" minimum for sch. 40 pvc. I'd run 1" to make it easier to pull.

darren 07-29-2010 04:36 PM

If you are useing RW90xlpe you will have to run 1".

vlatva 07-31-2010 09:14 AM

#6/3 NMWU copper is good for 65 amps, and since manufacturer do not make 65 amps breaker, the code allow us to go to the next available, which in our case will be 70 amps. So either 60 or 70 amps breaker will do.

It's always cheaper to run a cable, instead of doing PVC conduit run. You will need to bury it 2 feet deep in both cases.

Personally, I do most of my garage and toll shack sub-panels with TECK90 aluminium cable. It's 3 to 4 times cheaper than copper, and the cable is extremely resistant to abuse. In this case you would need #4/3 TECK aluminium cable (good for 65 amps), plus standard connectors to plug it at both ends (do not buy TECK connectors, they are intented for use in wet locations and are expensive, in this case you do not need them).

You cannot buy TECK are your local hardware store, you need to go to the nearest Lumen, Westburne, Nedco, Wesco store...just pick the nearest.

vsheetz 07-31-2010 10:26 AM

Quote:

Originally Posted by james582 (Post 476877)
hi i am wiring my detached garage (in canada) i am puting a 100 amp sub panel in the garage. i was told i need a smaller breaker in the main panel so i am using a 60 amp d.p.b. in the house witch should be sufficent for the garage. i have a run of a little less than 35 feet i was told i need to use #6/3 underground wire is this corect or can i use #8 or #10 i am running it in conduit underground

Is this a Canadian requirement?

Also I suggest to run a amply oversized conduit - makes it easier to pull and can easily accomodate a future change to a larger wire should it be desired.

darren 08-02-2010 05:21 PM

#6/3 NMWU copper is good for 65 amps, and since manufacturer do not make 65 amps breaker, the code allow us to go to the next available, which in our case will be 70 amps. So either 60 or 70 amps breaker will do.

Where does it say this in the code book, there is the 5% rule but your not with in 5% with this wire.

hi i am wiring my detached garage (in canada) i am puting a 100 amp sub panel in the garage. i was told i need a smaller breaker in the main panel.

No he only wants 60A in the garage but his panel is rated at 100A so in this case he needs to install a smaller(60A) breaker in the main panel.


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