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How to wire a shed for electricity

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Step 6: Connecting the circuit to the switch and the main box

I selected one of the basement windows the entry for the liquid tight conduit. I drilled the hole in the window using a spade bit big enough for the conduit to go in. I connected the conduit to the switch box thus allowing me to turn the electricity off when on vacation.
 
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dufus25061 year ago
You should never run jacketed wire through a conduit. You should buy the spools of individual conductors, and use those.

Part of a wire's rating (how much current it can carry) is it's ability to give up heat. If you put insulated wire into a conduit, it becomes like a little oven trapping the heat that the current creates.

If you MUST use jacketed wire, you should de-rate the wire. So, a 12 gauge wire that would normally be rated for 20 amps, would instead have a 15 amp circuit breaker.

Be safe.
mrbigtw1 year ago
Hello, thanks for this writeup. I'm looking to do something similar for my shed. I'm thinking 2 overhead lightbulbs with switch, a very small window like a/c unit in the summer,and small space heater in winter, and a couple other outlets for skillsaw, etc. Its about a 75 foot run, so I'm almost thinking 10 gauge, 20amp. Maybe 30 amp breaker? I'm curious about your wiring to your mainbox. Do you have this line with a new single breaker box and also a breaker in your mainbox? so a double breaker?
blkhawk (author)  mrbigtw1 year ago
The small box that you see is only a switch to turn the electric off at the shed whenever I am on vacation or if I am performing an electrical upgrade in the shed. I am not an electrician and I am not sure about the power requirement for your a/c and heater. You could post a question in the Question and Answers forum to find out the breaker amperage rating needed.
vincent75203 years ago
Yes it's a real mess and it is also an example of the american contrast : the american are the only people on earth who can send men to the moon or on mars, but I never saw a domestic electric installation which was not a mess like that … 
In europe regulations are so stringent that no handyman would accept to leave an appliance in such a mess : he would be held responsible and the insurance would not cover it ! … 

how funny : same techniques vs different countries / culture => different benchmarks !…