Do box screws count as a ground path?

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Old 12-12-15, 05:58 PM
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Do box screws count as a ground path?

Lets say I mount a metal light fixture to a fixture bar which is secured to a (grounded) metal junction box with box screws. Is the fixture grounded?
 
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Old 12-12-15, 06:13 PM
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The fixture bar should be grounded to both the light fixture and metal box.
The bars usually have a ground wire already attached. Connect that ground wire to source ground, light ground and box.
If the bar has no ground wire, there is usually a tapped hole for a ground screw.
 
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Old 12-12-15, 06:15 PM
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There is a taped hole for a ground screw I was just wondering if that was still necessary if the metal lamp is connected via a metal nipple to the bar which is connected via metal screws to the box which is grounded.
 
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Old 12-12-15, 06:50 PM
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Yes, it's necessary. The screws securing the light bar to the box is not a reliable ground.
 
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