#100 AMP SUB PANEL WIRE SIZE CHART CODE#

Here is a link to a bulletin from Technical Safety BC (the electrical work permit authority in BC) dated in 2020.

#100 AMP SUB PANEL WIRE SIZE CHART CODE#

I also downloaded the 2018 CEC and I think he may have been mistaken about the code changing. It's about a 10m run of cable, so the cost difference here is significant. The largest size of regular, plastic-insulated 3c cable is 2 AWG. Thing is, I cannot find 3c cable ANYWHERE larger than 2 AWG that isn't armored. Now, I'm all for over-doing things and using a larger conductor than necessary. When he looked at the cable connecting the existing subpanel, he made a comment that the code changed and you have to use 1 AWG. I now intend to do this myself, but I had an electrician come over originally to give a quote on the job. I plan to run another 100A subpanel into the garage, which conveniently shares a wall with the utility room in the basement (where the main panel is). House was built in 2017, current CEC was released in 2018. The two panels are connected with 2 AWG 3C NMD90 cable. I have a 200 A main panel and a 100 A subpanel next to it, which I believe the builders installed originally because they ran out of room in the main panel. So this is a question specific to the Canadian electrical code (and BC more specifically).

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100 amp sub panel wire size chart