Grounding of boxes

[Rick 0920]

When does a metal, noncurrent-carrying part of an outlet box NOT need to be grounded? For example, plastic luminaire boxes with metal brackets for the box to slide on. I know I'm reaching here but there is a chance for one of the 2 metal screws to become accidentally energized by conductor with damaged insulation that has been pushed back in the box.

 

[petersonra]

When does a metal, noncurrent-carrying part of an outlet box NOT need to be grounded? For example, plastic luminaire boxes with metal brackets for the box to slide on. I know I'm reaching here but there is a chance for one of the 2 metal screws to become accidentally energized by conductor with damaged insulation that has been pushed back in the box.

I guess it is "possible", but would that trigger a need to ground the bracket?

 

[tom baker]

Luminaires I have recently installed have a grounding screw on the metal strap, that the luminaire mounts to

 

[LarryFine]

When does a metal, noncurrent-carrying part of an outlet box NOT need to be grounded? For example, plastic luminaire boxes with metal brackets for the box to slide on. I know I'm reaching here but there is a chance for one of the 2 metal screws to become accidentally energized by conductor with damaged insulation that has been pushed back in the box.

The recessed head surrounded by plastic makes such bonding unnecessary.