How do you run a new breaker box in a detached garage from the existing breaker box in the house?

Answer 1

for USA, Canada and countries running a 60 Hz power supply service.This is too involved to answer in a few short sentences. Get an electrician to do the work safely or a really good book on the subject.

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One thing that most home owners don't understand, although the NEC is quite clear on this, is that if the sub-panel is in a detached building, it gets its own ground. You don't run a ground wire from the main panel to the sub-panel. Rather, you run only the neutral and two hots, and bond the neutral to the ground within the sub-panel, then ground it to an 8 foot long rod pounded into the ground, or other appropriate ground.

This is all quite different from the sub-panel being in the same building as the main panel. In that case, you run a separate ground wire, and don't bond the neutral and the ground at the sub-panel.

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As always, if you are in doubt about what to do, the best advice anyone should give you is to call a licensed electrician to advise what work is needed.

Before you do any work yourself,

on electrical circuits, equipment or appliances,

always use a test meter to ensure the circuit is, in fact, de-energized.

IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB

SAFELY AND COMPETENTLY

REFER THIS WORK TO QUALIFIED PROFESSIONALS.

Answer 2

To run a new breaker box in a detached garage from the existing breaker box in the house, you will need to run a new electrical feeder line from the house to the garage. This involves digging a trench, running electrical conduit, and wiring the new breaker box in the garage. It is important to follow all local building codes and regulations, as well as ensuring proper grounding and safety precautions are in place. It may be best to consult with a licensed electrician for this type of project.