First off, I'm a electrical noob. With that being said, I'm sure you all will tell me not to do this job. I want to add some additional plugs in my garage. Whoever wired it, 60 years ago, only allotted for 2 wall plugs. What a cheap ass.
Don't be such a democrat. It's only electricity.
I want to add a couple extra 110 plugs and more importantly a 220. I'm toying with getting a entry stick machine. I've done some welding, but not on high stress parts. I did pipe fence building, so the most it would have is a large cow leaning against it.
Before I cut, orange peeled and welded about 1000' feet of pipe fence, I did not know how to stick weld either.
I have a sub-panel in the garage that came from the main panel in the house. From what I can tell it does have 220 running to it. I'll grab a few pictures tomorrow.
Let us know what kind of line feeds the panel and what the panel is rated for.
The main breaker up top (or breaker feeding the panel) will give you a clue as to what is feeding the panel. The panel door will let you know what the panel supports.
While you work on that, you can start reading about voltage drop and look up your conductor size requirements for your runs to outlets. I use this
I've added electrical to many a garage and these are the things I've learned:
- Run 20 amp circuits + receptacles instead of 15 amps.
- Try and run multiple circuits to alternating receptacles so if you trip one, you don't lose power to all receptacles
- Place receptacles 50" from the floor so you can lean a 4x8 on the wall and still plug stuff in
- Run receptacles every 18-24" (whatever your stud spacing allows) down the wall
- Run one receptacle 24" from the ceiling on each wall (these come in handy for neon signs or electric clocks).
- Wrestling with Romex larger than #10 is a bitch - try THHN in a conduit for luxurious smooth sliding.
- Run the largest 240v circuit as you can that way you can run a real air compressor or a welder.
- Take the time to secure your wire so it can pass a "pull test".
- Use nail plates to protect studs that have wire passing thru.
- Use the pigtail wiring method for wiring receptacles - see attached.
- Use screw terminals, not push terminals. They will only break your heart.
- When you run your 240v receptacle for your welder, you will most likely be using the old style 3 prong connector that only runs 2x hot and 1x ground. I've seen a lot of installs where the neutral in 6/3 is used as the ground, which is what I've always done. The correct way is to use the bare ground, unless you are dealing with larger conductors for voltage drop (another discussion and 50 post revisions). Basically, if you keep your run of 6/3 under 80 feet, you are fine.
I've updated this post a bunch of times and fixed the welder receptacle diagram.