Just an overall view - I'm going to add a subpanel in my garage. Some call it attached, the town calls it detached. Either way, a general description to me is that it is a detached garage connected to the house by a covered but open walkway, if that makes any sense. The main panel for the house is in the garage. It's a 150 amp panel that is out of space. It has a small subpanel on it already that is 60 amp and also out of space.
I was thinking about just replacing the smaller subpanel, but the stove and oven is already on it, and I would rather have that separate from the garage panel. With my wife cooking with the high draw oven and stove, my compressor running in the garage, and perhaps some other load in the garage, I can see that starting to load up one subpanel.
Because of that, I'm going to add another 100 amp Square D panel immediately next to the main panel. I'll use a 100 amp breaker in the main panel box, using three lines of #1 THHN cable and a ground running through a 1 1/2" metal conduit into the subpanel hooked up thorough the 100 amp main breaker that is already installed in the new subpanel. I'll take out two breakers in the main box to make room, and put those two light duty household lighting circuits into the new subpanel.
There will be various lighting and electrical out let circuits in the garage, and I'll use 12/2 romex for all of them. As for the "special" electrical needs in the garage, here's what I plan:
A 18,000 BTU through the wall Air Conditioner for those brutally hot Houston summers. I can do a through the wall unit A/C install myself, where as a split system requires a pro install and is more pricey, neither of which sounds good to me. It'll only be used when I am out there working, so the increased efficiency means very little. I'll run that on 10/3 romex off of a 30 amp breaker in the new subpanel. This will be about a 40 foot run.
A 5HP 60 gallon compressor on it's own line. I'll use 8/3 line off of a 40 amp breaker. This will be about a 30 foot run.
A just in case, 220v outlet. To be used for whatever may pop up. It may well never get used, but better to tun one and have it if needed before the insulation and sheetrock go in. I'm thinking about another 8/3 line with a 40 amp breaker again. It'll be about a 35 foot run. What do you guys think, should I go bigger? Is there any equipment you can think of that is common in a car tinkerers garage that might need bigger? I'm not much of a welder, so I am not familiar with what a typical welding unit would need.
Anyone have any concerns or ideas about any of this?
I was thinking about just replacing the smaller subpanel, but the stove and oven is already on it, and I would rather have that separate from the garage panel. With my wife cooking with the high draw oven and stove, my compressor running in the garage, and perhaps some other load in the garage, I can see that starting to load up one subpanel.
Because of that, I'm going to add another 100 amp Square D panel immediately next to the main panel. I'll use a 100 amp breaker in the main panel box, using three lines of #1 THHN cable and a ground running through a 1 1/2" metal conduit into the subpanel hooked up thorough the 100 amp main breaker that is already installed in the new subpanel. I'll take out two breakers in the main box to make room, and put those two light duty household lighting circuits into the new subpanel.
There will be various lighting and electrical out let circuits in the garage, and I'll use 12/2 romex for all of them. As for the "special" electrical needs in the garage, here's what I plan:
A 18,000 BTU through the wall Air Conditioner for those brutally hot Houston summers. I can do a through the wall unit A/C install myself, where as a split system requires a pro install and is more pricey, neither of which sounds good to me. It'll only be used when I am out there working, so the increased efficiency means very little. I'll run that on 10/3 romex off of a 30 amp breaker in the new subpanel. This will be about a 40 foot run.
A 5HP 60 gallon compressor on it's own line. I'll use 8/3 line off of a 40 amp breaker. This will be about a 30 foot run.
A just in case, 220v outlet. To be used for whatever may pop up. It may well never get used, but better to tun one and have it if needed before the insulation and sheetrock go in. I'm thinking about another 8/3 line with a 40 amp breaker again. It'll be about a 35 foot run. What do you guys think, should I go bigger? Is there any equipment you can think of that is common in a car tinkerers garage that might need bigger? I'm not much of a welder, so I am not familiar with what a typical welding unit would need.
Anyone have any concerns or ideas about any of this?