How can you ground a porcelain light fixture with no ground screw and not mounted in a metal box or do you even have to if not what do you do with ground wire?

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Porcelain "keyless" fixtures do not have any designated ground screw, so, assuming there's a supply point "box" already in the ceiling or wall where the light is to be fixed, if there's more than one ground wire in the box, just bond all the ground wires together. "Bond" means "twist them together" or - and this is the best practice - use a simple electrical wiring connector to fix them together securely. Then make sure the ground wires won't be pressed hard against the coloured plastic insulation of any other wires in the supply point box when the light fixture is screwed down. In practice you just need to check they will stay nice and loose after you have shoved the ground wires back into the supply point box. IF YOU ARE NOT ALREADY SURE YOU CAN DO THIS JOB
SAFELY AND COMPETENTLY
REFER THIS WORK TO QUALIFIED PROFESSIONALS.

If you do this work yourself, always turn off the power at the breaker box/fuse panel BEFORE you attempt to do any work AND always use a meter or voltage indicator to insure the circuit is, in fact, de-energized.
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