Reply by EEngineer

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Posted on How can I tell if I have 220 to my garage?

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1103 posts in 3639 days

#1 posted 10-13-2012 12:05 AM

The only one that makes any sense here is REO. The rest…

eww, old fuses.
Why say that? Fuses used to be all we had and they protect circuits just as well. Granted, for new work, I think you would be crazy to use them, but for existing circuits – they work and they are safe!

If its underground, you will need to run an additional ground wire from your load panel in the house to the sub panel in the garage … and then from the garage panel to a grounding rod driven into the ground.
Since NEC 2011 (maybe earlier), the additional ground wire is always required. Attached, detached, underground, overhead, whatever… You may be “grandfathered”, but I think the separate ground wire has significant safety advantages! The grounding rods depend on how the wire is run. For instance, metal pipe from the main structure to the garage can serve as a ground with restrictions (NEC Handbook search detached building grounding subpanel).

Your Volt meter is the only way to be dead sure, and with 220, if you get it wrong, you can be (this is why the US decided to go 110/120 in Residential, while the rest of the known universe, save Japan and a few other countries, are 220V.
Ahhh, bullcrap! You can be just as dead with 110VAC! It all depends on how well you connect! You need to treat 110 circuits with the same care you do 220!

-- "Find out what you cannot do and then go do it!"

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