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Electrical Wiring and Grounding?

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The longest runs are about 70 feet. 


It's been a long time, but basically you want to compute the voltage drop for the load you intend to place on the circuit. Failing to size this right can result in the old "the lights dim when the fridge kicks on" syndrome. If your electrician seems incompetent you can either just go up a size to be safe, or I bet there is an online calculator to help with this stuff nowadays. 

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