My boss wants me to use the junction boxes where I am mounting the receptacles that power individual machines, to also support the cable drops to the same machine. His thought is to drill a hole thru the side of the box and mount a hook to hold the kellum grip. I'm pretty sure that this isn't right but I need to find it in the code.
We are using 12/4 and 10/4 SO cords on all of the machines, with a woven strain relief to support the cable at the ceiling and twist-locks for the disconnect plug. If I am not allowed to use conduit to support things, how can I be allowed to drill thru the side of a junction box to hang a cable?
I'm looking thru the 2002 code book but I haven't found it yet. Can anybody help me with this?
Typical machine: Bridgeport Horizontal Mill Ten feet of 10/4 SO cable exiting control box. Eight feet from the machine end of cable, a 2 loop woven mesh cable grip. At the end of the cable, a twist-lock plug. Mounted on the ceiling truss, a 4 11/16" square box with cover and mating receptacle.
My boss wants me to drill a hole and mount a hook INTO the side of the receptacle box to hang the cable grip loops. I would rather use a separate beam clamp to mount the hook.
Re: Using receptacle boxes for supporting cable drops.#88760 07/22/0405:02 PM07/22/0405:02 PM
Boxes are designed for raceway/cable/etc entries and containing conductors. Modifying the box, by drilling a hole, could be considered a 'violation of the listing' or 'not complying with mfg directions/instructions'. No intention of starting a "definition and wordsmith debate is intended!
It is probably cheaper (labor) to install a beam clamp, then to invest time in drilling the box.
Your AHJ may require the beam clamp/hook, and closing the hole you drilled, so you may end up replacing the box if you can't satisfactorly close-up the hole.