Home Improvement Asked by somemothersson on March 2, 2021
Need 240V 20AMPs in detached garage for 16 AMP Level 2 EV Charger (Chevy Spark) at my MIL’s home.
1200 sqft House, has a 100 AMP Panel. Furnace, Dryer, and Stove are Gas. All circuits are 20AMPs, and currently unlabeled. Only 240v appliance is 20AMP for central AC.
Garage is currently fed by 20AMP circuit from the main panel via Underground conduit run (probably about 25-30feet). Feeding a couple lights, outlets and 2 car garage door opener. No heavy equipment in garage
Here’s what I’m thinking:
Updated Information
The Main Panel has 12, 20 Amp Circuits @ 120(Including the garage I want to switch to a subpanel 30 @ 240). And 1, 20Amp @ 240 for Central AC.
Pipe feeding the garage is 1 inch.
If it can support running a 50AMP subpanel for futureproofing Im all for it, but if its a difference of upgrading the main panel or not, I’ll take the less intrusive option.
I used the calculator located here Electrical load Calculator and it output Total VA Load = 12600 Total Amp Load = 53.
1/2 inch conduit would accept 4 #10 thhn /thwn conductors for your original 30 Amp design.
3/4 inch would accept 4# 6 thhn / thwn for your 60 amp design, but not certain of your local code, where in some places, it will require 1".
What size panel is your MAIN panel ? If it's 100 amps, I believe you are beyond the design limits. If your MAIN panel is 200 amps, you'll be fine with a 100 Amp Sub panel, as long as your MAIN it isn't loaded up with other stuff ...
The OTHER thing you're going to have to do when you wire that new sub panel...
REMOVE the tie ( jumper ) between the ground and neutral in the sub, if it has one.. ...Unlike your MAIN has got, any sub panel must have that ground-to-neutral jumper removed.
This is for when you hook back up your existing 115v. circuits, if there is ever any faults to ground, they do not travel up the neutral that is in your sub panel. All ground faults will travel through the grounding conductor in your sub to your main.
Answered by Retired Electrician on March 2, 2021
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