Connecting ground wire to old wire?


Old 07-14-08, 10:01 AM
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Connecting ground wire to old wire?

I am in the process of rewiring our house and I ran into a point where one breaker covers outlets on the first floor and switches/lights on the second floor. I do not want to rip up the walls going to the second floor because they are in good shape. All of the wire in the house is old 2-wire with no ground wire. Can I replace the wires from the breaker and between the outlets on the first floor and leave the old wire that goes upstairs as is?
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Old 07-14-08, 10:52 AM
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So long as the breaker protecting the circuit is sized for the SMALLEST wire in the combined circuits there should be no problem. Keep in mind you can further protect the 2 wire circuit if desired or required by using a GFCI. A GFCI does not require a ground wire to operate.
Old 07-14-08, 01:02 PM
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No. The code allows you to leave existing circuits as-is or upgrade the entire the circuit to meet code. You cannot upgrade individual sections of a grandfathered circuit.

Your inspector may be willing to make an exception if you have a solid plan, but I would check with him before proceeding.

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