Not to be construed as advice or a recommendation. Consult an Electrician familiar with the rules in your local area.
Based on 2015 CEC - Should be similiar to the NEC
If your distance is not too far you can go down to #4. Stick with the #3 though especially if it's possible both A/C units will kick on at the same time.
What distance are you running from your main panel? If its more than 100 Feet I would upsize to #2 Copper, as you're probably going to have your lights dim when the AC units kick on. Check the price difference between your copper and aluminum conductors 2 sizes larger.
IE #3 copper vs #1 Aluminum.
For a subpanel feeder, aluminum is the way to go in my opinion and will probably be 1/3rd the price. Just make sure to purchase a bottle of penetrox with it and ensure the wire is coated with it before terminating.
Based on 2015 CEC - Should be similiar to the NEC
If your distance is not too far you can go down to #4. Stick with the #3 though especially if it's possible both A/C units will kick on at the same time.
What distance are you running from your main panel? If its more than 100 Feet I would upsize to #2 Copper, as you're probably going to have your lights dim when the AC units kick on. Check the price difference between your copper and aluminum conductors 2 sizes larger.
IE #3 copper vs #1 Aluminum.
For a subpanel feeder, aluminum is the way to go in my opinion and will probably be 1/3rd the price. Just make sure to purchase a bottle of penetrox with it and ensure the wire is coated with it before terminating.
