ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Israel
by annemarie1. 04/18/19 02:35 PM
Welded Copper Connections
by gfretwell. 04/17/19 10:03 PM
Water heater calculationsSo when I count calculati
by watersparkfalls. 04/13/19 12:43 PM
Health Canada Electric Construction heaters recall
by dougwells. 04/12/19 01:22 AM
Burning out of return(white) side of 120volt rec
by richard. 04/08/19 07:12 PM
New in the Gallery:
What is this for?
Plug terminals
Who's Online Now
0 registered members (), 2 guests, and 6 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
NM wire in commercial ceiling? #214635
12/29/14 07:39 PM
12/29/14 07:39 PM
T
Trick440  Offline OP
Member
Joined: Aug 2005
Posts: 248
Waterford, MI, USA
Can NM wire be used in a commercial building?

We have a suspended ceiling, that is going to be drywalled. Its steel framing and grid.

I just had 2 guys on a job working today and they ran NM for the recessed lighting?! They even fished it down a steel framed wall to the switch.

The Journeymen on site was assuring me its legal, cause its being drywalled and its not a 3 story building?

I have never tried running NM in commercial and never looked it up, but... Looking up 334.12, uses not permitted, (a)(2) says not permitted in, dropped or suspended ceilings.

Please confirm that these guys just wasted more than half a day doing it wrong. smile

Last edited by Trick440; 12/29/14 07:42 PM.

Shake n Bake
2017 / 2014 NEC & Related Books and Study Guides
Re: NM wire in commercial ceiling? [Re: Trick440] #214636
12/29/14 09:04 PM
12/29/14 09:04 PM
S
shortcircuit  Offline
Member
Joined: Jun 2004
Posts: 610
massachusetts
Depends on the construction type. Section 334.10(3) allows NM in type III, IV an V constructed buildings when concealed with a 15 minute fire rated assembly.

A dropped ceiling that is drywalled is different than a accessible grid type drop ceiling...


Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Bill Addiss
Bill Addiss
NY, USA
Posts: 3,905
Joined: October 2000
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
254,445 Are you busy
190,685 Re: Forum
180,402 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.020s Queries: 15 (0.005s) Memory: 0.9433 MB (Peak: 1.0595 MB) Zlib enabled. Server Time: 2019-04-19 10:30:06 UTC