Frame work bonding

[jonathn1]

Industrial setting in a theater, like a CircDu Solei building, (as a reference for the type not that actual building). I have a motor and blower assy that is attached to a metal frame. No bonding is in place. The metal frame is constructed using unistrut and standard unistrut connections and fittings with nuts and bolts. The frame work was constructed in a box style with several braces and cross braces so it could also mount the control cabinet on.
My question is do I need to bond each location where the unistrut connectors are, and if so do i need to drill and tap them?

 

[bphgravity]

I say no. The bolted connections between each metal member serves as the bond, including the bolted connection of the electrical equipment to the metal framing members.

(You can't "over-bond". If in doubt, bond it)

 

[LarryFine]

I have a motor and blower assy that is attached to a metal frame. No bonding is in place.

The motor itself should be grounded, and that should suffice as the item likely to cause energization.