Cutting hole in trough or duct.

[aelectricalman]

Does anyone know if there is an exceptable way to cut 1 big hole where a trough meets the gear, as opposed to multiple chase nipples?

Example, I am adding a transfer switch in front of the gear box. I am using a trough on top of the gear to connect the two, as opposed to 8 sets of 4 inch conduit for the multiple parelleled 750mcm feeders. Trying to make it easier! If I cut one hole between the gear and the trough, what is the proper way to protect the wire from the edges? Thanks for any help in advance.

 

[iwire]

Sure, use a trough flange.

http://www.munroelectric.com/silver...ctrical.Enclosures,Trough...Fittings,Fittings

 

[aelectricalman]

Awesome. Thanks

 

[petersonra]

We sometimes have to do something similar, although on a smaller scale. We usually blot the two things together and cut a square hole out through the wall of both boxes. Then line the edges with a grommet materal to protect the wires.

 

[infinity]

We typically use a flange like the one Bob posted. Has nice smooth edges.