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Tying into existing groundless knob and tube to run a couple fixtures and one outlet. Grounds?

Hey, Just moved into a new apartment. Bathroom is being remodeled. Old knob and tube into a metal box feeding two switches independently ran from the box. Running one feed from the box to a plastic box in wall pigtailed to a GFIC and a switch that then runs its switch leg to a ceiling fixture. One more feed to a separate wall switch running a light over the medicine cabinet. I would love to just be able to re do all the way to the box and run a good ground so that all was known to be good but that is not an option. What would be best practice for the ground wires? Thanks much for the help!

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Being as it is in the bathroom, there should be a cold-water metal pipe near. Attach a green conductor using an approved ground clamp. Run the wire to the outlet you want to ground. Attach to the box (if metal) then attach to the receptacle. If you can't get a ground installed as described, you could protect all the items (ceiling light and light over the sink) with the GFCI. All you need to do is feed the two items from the load side of the GFCI instead of the line side. This provides "people" protection as the GFCI function does not require a ground to detect the imbalance between the "hot" and the "neutral". This does not provide "equipment" protection.

Posted on Apr 29, 2015

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