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Can I add a green ground screen to my exhaust fan's housing (metal) and connect the green ground wire to it? There is no ground wire in the old supply wiring.

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    Can you post a photo of how the existing exhaust fan is hooked up, showing where the wires come into the box? – ThreePhaseEel Sep 26 '16 at 23:03
  • Is the old wiring in conduit or some sort of metal sheathing? If so, these may also be grounding paths. – statueuphemism Sep 27 '16 at 14:20
  • FYI "grounded" conductor means the neutral, whereas "grounding" conductor is the equipment ground. What exactly are you referring to? – Hari Ganti May 1 '18 at 0:11
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Sure, but it won't do anything. The term "ground" implies an electrical connection to the Earth, which is normally provided by the bare grounded conductor.

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If the "old supply wiring" has no ground, and ground is not available by conduit or nearby plumbing, then you would have to install a new cable that contains a ground wire. Unfortunately, the NEC does not permit using the neutral (aka grounded conductor) as the equipment ground per 250.136(B)

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