Coppersmith
Senior Member
- Location
- Tampa, FL, USA
- Occupation
- Electrical Contractor
I am rewiring a house that has a NEMA 3R outside panel. The existing installation has a riser out of the hub on the top of the panel that extends 22". All of the NM cables go through the riser, into the eave, and then distribute through the attic. There is a 6" wide U-shaped sheet metal chase over top of the cables and the riser that is fastened to the wall. The chase extends into the eave and down to 3" above the panel.
I plan on redoing this in the same manner except I'm going to fan out the NM cables and fasten them prior to going into the eaves, and replace the chase with one that is panel width.
This seems to be compliant with (2011) 312.5 exception however I'm concerned whether the inside of the chase and inside of the riser would be considered dry locations (required for the NM).
also, just for curiosity,
312.5 exc (b) makes reference to a structural ceiling I'm not allowed to penetrate directly with the riser. Is the plastic or metal vents covering the eave considered a structural ceiling?
I plan on redoing this in the same manner except I'm going to fan out the NM cables and fasten them prior to going into the eaves, and replace the chase with one that is panel width.
This seems to be compliant with (2011) 312.5 exception however I'm concerned whether the inside of the chase and inside of the riser would be considered dry locations (required for the NM).
also, just for curiosity,
312.5 exc (b) makes reference to a structural ceiling I'm not allowed to penetrate directly with the riser. Is the plastic or metal vents covering the eave considered a structural ceiling?