I have a 100 amp service in my house and want to run power to a sub pannel in my garage and I’m wondering how big of service I can make it. I was thinking of a 40 or 60 amp service, would this be possible? I live in house that has 2 2 bedroom units (each unit is approx 750 sq’). The units share the gas furnace, electric hot water tank and washer and dryer. The garage is one car (12×20), insulated with a small 4.5′ high attic above, for storage that I will heat with a 1000w baseboard heater. The main garage area will be used for storage and as a hobby woodworking shop. Not sure yet how I’ll heat it but I may just use a construction heater (240v) when I’m in the garage. In the future I would like to be able to run a welder and will most likely need at max a 220v 30 amp plug. Any comments from folks are most appreciated. I live in Vancouver BC.
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Legally you can put a 100a feeder out there but from a practical sense you really need to do a load calculation to see where you are and what you can add.
There are some load calc Excel templates floating around on the internet
My next-door neighbor just had a separate service installed to his "Garage Mahal"/mancave.
Depending on the layout, another option is to put the 200a in the garage and feed the house back with 100a.
It does have the advantage of being able to build the garage service, dig the feeder etc at your liesure and swing everything over in a fairly short time.
When I did it the electrician was hooking up the feeder to the house while the PoCo swung over the service. They moved the meter and off we went.
The most time consuming thing was separating the neutral and ground wires in the house onto the new ground bus..