Wireway extension collar

[KBot9]

I'm trying to figure if it is in any manner against NEC to add a wireway collar (open in back) and screwed to the front of an existing wireway, removing its cover (the existing WW is near 20% fill), to increase the total area and add more conductors within the collar area, but of course less than 30 conductors total combined old and new ?

 

[acrwc10]

Do you mean like an extension box?

 

[infinity]

Wireways are designed to be cut and punched. I don't see why you couldn't make your own collar.

 

[KBot9]

Yes exactly like an extension box where we either have it made or cut out the back of a wireway and screw it to the front of an existing one.

 

[LarryFine]

If the original wireway is not custom made, the manufacturer may have one with matching holes.

 

[Rick 0920]

I'm trying to figure if it is in any manner against NEC to add a wireway collar (open in back) and screwed to the front of an existing wireway, removing its cover (the existing WW is near 20% fill), to increase the total area and add more conductors within the collar area, but of course less than 30 conductors total combined old and new ?

I've done it above some big dimmer cabinets in auditoriums. when you cut out the back of them they become a little flimsy, but they will work.