What guage wire to use

[jimmyj]

Yes, there are 4 wires in total, red black white and ground. I'd rather be a bit over than a bit under too.

 

[LD1]

8-3 UF wire si good for 40A.

Wondering why your electrician is suggesting 6-3? (which is good for 55A). Maybe because he already has some on had?

Also, not sure what type of breakers you have, but it may be a bit difficult putting 6ga on a 40A breaker.

As far as length, you can go to 125' pulling 40A on 8ga before you exceed 3% voltage drop. So I dont see that being a reason to upsize wire either.

Now you may want to see if there is anything you can do to get the circuit length to 50'. Wire comes standard in 25', 50', 125', 250, etc rolls. See if you can make 50' work and not have to buy 125' of wire, and not use 70' of it.

BTW, 50' 8-3UF is ~$90
.......125' 8-3UF is ~$190

 

[jimmyj]

I bought the 6 3 yesterday. Actually needed 18 meters and it cost 244.00. Everyone I talk to says use #6, I assume it's a local standard.

 

[LD1]

Wow, thats pricey. Can get 50' here for ~$110 and 125' for about $300

 

[buickanddeere]

Usually a good idea to run a 12/3 out there at the same time to power a pair of 20amp T-slot GFI plugs in the yard.
Either net for wifi too.

 

[jimmyj]

Wow, thats pricey. Can get 50' here for ~$110 and 125' for about $300

Welcome to Canada, the land of the overcharged.