Uses permitted with Type NM

[irving1008]

Can type NM cable be use as lightning switch legs in commercial office drop ceiling


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[FionaZuppa]

What does your locale rules for commercial space say? NEC 334.12.

 

[Dennis Alwon]

No, nm cannot be in a dropped ceiling except for a one and two family dwelling. @irving1008

334.12 Uses Not Permitted.
(A) Types NM, NMC, and NMS. Types NM, NMC, and NMS
cables shall not be permitted as follows:
(1) In any dwelling or structure not specifically permitted in
334.10(1), (2), (3), and (5)
(2) Exposed within a dropped or suspended ceiling cavity in
other than one- and two-family and multifamily dwellings

 

[Knuckle Dragger]

Check your state amendments you might be allowed to.

 

[FionaZuppa]

I have seen NM in some commercial space, but it was a building from 1970's and all wood framed. Unless the locale allows it I would caution on the side of NEC and say no.

 

[electrofelon]

Check your state amendments you might be allowed to.

MA is one of the states that allows NM above drop ceilings. Iwire mentioned using NM above drop ceilings in supermarkets to feed 3PH 480 V RTU's!

 

[kwired]

You could run raceway in the suspended ceiling area, place a junction box on a wall, exit the back of that box with NM cable to run within the wall though.