Control panel wireway/gutter/channel fill limits

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Tombabob

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I am curious which Code Article(378,382,388,...) would cover % fill limits on a control panel which includes plc controls and associated relays. I don't think just being able to attach the cover to the slotted raceway should be the limit. The wireway is a slotted type of plastic gutter. I have attempted to upload a pic, but doesn't like my .jpg file.
 

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
It is not a NEC Raceway so it's not in the National electrical code at all.

You could look up the instructions that came with the wire duct and see what it says. I don't recall off the top of my head but I think they usually say 40% fill.

Keep in mind that 40% fill includes a lot of dead air space so even a duct that looks like it's packed to the gills might only be 40% full.
 
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