300.4(E) Cables and Raceways Installed in Shallow Grooves. Cable- or raceway-type wiring methods installed in a groove, to be covered by wallboard, siding, paneling, carpeting, or similar finish, shall be protected by 1.6 mm (1/16 in.) thick steel plate, sleeve, or equivalent or by not less than 32 mm (11/4 in.) free space for the full length of the groove in which the cable or raceway is installed. Exception: Steel plates, sleeves, or the equivalent shall not be required to protect rigid metal conduit, intermediate metal conduit, rigid nonmetallic conduit, or electrical metallic tubing.
Re: This MC Cable is Subject to Damage#103846 12/04/0209:13 PM12/04/0209:13 PM
330.10 (A)(11) Allows MC cable "embedded in plaster finish on brick or other masonary except damp and wet locations". I've seen this done and accepted this way. Come to think of it I have done this in some buildings in Boston. I think this is ok but I am open to opinions otherwise.
Re: This MC Cable is Subject to Damage#103847 12/04/0209:19 PM12/04/0209:19 PM
I've always wondered about that 1/16" plate thing. On a bad day I could easily drive a nail through a 1/16" piece of steel. My brad nailer would easily shoot through 1/16"...probably thicker....
I've been bad because I've buried romex in brick walls...but I'm thinking of placing little tiny "CAUTION: Buried Cable" flags in the wall where the wire is embedded. I did manage to take pictures of where the wires were placed for future reference. Now if I could only find the pictures. Next time I'm going to use some form of conduit.
I also make sure to never shoot brad nails directly under an outlet. There's always that slim possibility that a wire might be nearby. Plus air-driven nails have a strange way of making detours as they enter wood or brick.
Re: This MC Cable is Subject to Damage#103849 12/05/0211:59 AM12/05/0211:59 AM
This looks exactly like how wiring is done in central europe. Except for the fact we only use Romex. And we usually plaster it over and don't just leave it exposed. *grin* Here in Austria I have wired entire rooms like that. We once used to have some kind of flat Romex, (NYIF) (looked like zip cord, only double-sheathed and with more space between the conductors) which should ensure that any nail or screw driven into the cable wouldn't result in an arcing short. However, it costs 10 times as much as standard round 2 wire w/ ground Romex (NYM 3x1.5), so it starts to die out, which is a real pity.
Re: This MC Cable is Subject to Damage#103850 12/05/0212:03 PM12/05/0212:03 PM
Joe: The method in the pic was a common item in the New York City and Metro NJ, in older buildings. The "older" stuff was BX. The only concern that I would have is if the MC is aluminum armor (sheath) it could/can corrode in contact with the masonry and dampness. My NEC is in my truck, and it's snowing, so...I'll consult the bible in the AM John
Re: This MC Cable is Subject to Damage#103852 12/11/0210:05 PM12/11/0210:05 PM
Like Hotline, my bible isnt with me,but if Im not mistaken ( which I have been before) MC is ok for cinder filled or placement in old work on masonary walls.(Meaning not EMBEDDED in concrete or masonary) I've also argued the point to an inspector that protection is required all points that pass through or are attached to the building structure within an 1 1/4 inch.This would include studs @ 24 or 16 inch centers meant for drywall or covering, sill plates, and bottom plates. Add a stud for your switch box and it technically doesnt need a nail plate because its not intended for wall covering.This is only an agrumentative point and not a common practice, though. Bottom line is you need to protect your work. The biggest promblem I see in the pic is I dont think the MC can be embedded in the plaster that is going to patch the wall.
Re: This MC Cable is Subject to Damage#103853 12/12/0207:49 PM12/12/0207:49 PM
I think that some of the other comments are on the right track- this looks a lot like standard European practice (only better). And you wonder why I question the possibility of an "international" code?