The Electrical Contractor Network

ECN Electrical Forum
Discussion Forums for Electricians, Inspectors and Related Professionals

Books, Tools and Test Equipment for Electrical and Construction Trades

Register Now!

Register Now!

We want your input!


2017 NEC and Related
2017 NEC
Now Available!

Recent Posts
Son of Sparky
by sparky
58 minutes 49 seconds ago
Speaking of Plugmold ...
by gfretwell
10/17/16 02:37 PM
Broken battery charger? Check for cobwebs!
by gfretwell
10/17/16 02:30 PM
230 or 345 kV transmission lines?
by annemarie1
10/12/16 01:23 PM
Is this a fix or just a bandaid?
by gfretwell
10/10/16 06:49 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 11
renosteinke 6
HotLine1 6
ghost307 5
Potseal 4
Who's Online
0 registered (), 261 Guests and 5 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#85838 - 08/11/03 02:38 PM Plastic Boxes in Places of Assembly
mvrandazzo Offline

Registered: 05/13/02
Posts: 105
We've been wiring our new church building using metal boxes and MC cable. The fire alarm fellows have been running their stuff using blue plastic device boxes. Is this allowed in places of assembly? I know the 518-4 ex. It seems odd that the use of plastic would be OK under certain curcumstances but not others. But then again, that is why I'm not on a code making panel. Go fugure. Just thinging out loud.

Blessings, Mark

2014 / 2011 NEC & Related Books and Study Guides
#85839 - 08/11/03 03:18 PM Re: Plastic Boxes in Places of Assembly
Roger Offline

Registered: 05/18/02
Posts: 1779
Loc: N.C.
Mark, this would be a listing issue. Some plastic boxes are approved for installation in up to 2 hour fire walls and maybe higher.


#85840 - 08/12/03 10:41 PM Re: Plastic Boxes in Places of Assembly
Elzappr Offline

Registered: 12/20/01
Posts: 273
Loc: Oregon
I certainly can't see any exception that would allow the plastic boxes. I assume they aren't encased in 2" of concrete, so they can't be used.

#85841 - 08/13/03 03:41 AM Re: Plastic Boxes in Places of Assembly
PCBelarge Offline

Registered: 06/08/03
Posts: 657
Loc: Dobbs Ferry, NY, USA
The restrictions I see in Article 518 are for wiring methods, cables and raceways. 518.4(C)(1)does allow PVC in 15 minute fire rated walls (1/2 inch sheetrock). I am not sure how this would affect plastic boxes, this would probably be up to the building dept or the AHJ.

Pierre Belarge


ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals