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I'm turning a shed into a workshop. I already have two circuits that run to nearby exterior outlets that I want to tie into to power my shed/workshop. I would like to have 1 circuit for lights and the other for my power tools. My question is (I guess two-part): 1. In Southern CA, do I have to install a sub-panel in the shed/workshop? 2. If so, can these two circuits go into one sub-panel and remain separate? Or would it be best to do one sub for each circuit?

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If they are dedicated circuits, adding more outlets or lights will be ok, if they aren't dedicated, be careful what you add to the lines. Most electricians, not being able to sort out all that may be on any circuit, usually chooses to run new circuits. – Jack Mar 7 '14 at 23:04
If this is a detached shed then you already have a violation. You can only have one circuit or feeder to a detached structure. You'll need to run one new feeder to the shed for the sub-panel. – Speedy Petey Mar 7 '14 at 23:06

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