outside J box


Old 06-29-08, 03:23 PM
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outside J box

I want to put (2) outlet boxs in the back yard for power. Can I jump off one of the outlet boxes that is already wired inside the house that we don't ever use with a weatherproof J box?
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Old 06-30-08, 09:44 AM
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You can extend an existing circuit outdoors provided that:

1. the existing circuit does not supply a kitchen or bathroom
2. there is enough capacity on the circuit for the additional loads you intend to use outdoors
3. you use weatherproof boxes, GFCI receptacles, and bubble covers outdoors
4. you match the existing circuit wire gauge
4. you use a waterproof wiring method like UF-B cable or thwn conductors in pvc conduit.
Old 06-30-08, 10:04 AM
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I'll add a few more conditions:

6. The existing circuit does not supply the laundry room.

7. The existing circuit does not supply the dining room.

Keep in mind that outlets don't use any power by themselves, but what you plug in can use a lot. In some cases, outdoor tools can suck up all the power on a circuit.

Also remember that if the length of the cable is long and the outdoor tool uses a lot of power, there may be unacceptable voltage drop to your tool.

If you're going to bury this cable, you need to ensure that you have the proper burial depth. That requirement varies depending on where you bury it.

If you don't already have a few books on home wiring, then read them before proceeding. We've only told you a fraction of what you need to know.

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