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!

Featured:
   

2017 NEC and Related
2017 NEC
Now Available!

   
Recent Posts
Calling all Non-US members!! (Non-US only)
by aussie240
Yesterday at 02:39 AM
Photo Upload Tutorial
by DanK
12/06/16 11:35 PM
Sprinklered equipment 26-008
by bigpapa
12/02/16 04:24 PM
On Delay Relay with Auto Reset
by Potseal
12/01/16 09:59 AM
Wow, that was close!
by jraef
11/28/16 07:06 PM
New in the Gallery:
12.5A through 0.75mm˛ flex (just out of curiosity)
Shout Box

Top Posters (30 Days)
gfretwell 13
HotLine1 9
Texas_Ranger 8
sparkyinak 7
Trumpy 6
Who's Online
0 registered (), 230 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Topic Options
Rate This Topic
#78373 - 09/12/01 03:45 PM Cover mounted fixtures
Redsy Offline
Member

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
I have to repair a gable mounted HPS fixture that was mounted on the cover of the WP box and therefore only supported by the 2 #6-32 screws. I think it should be mounted on the threaded hubs, and I remember one of Joe T's photos showing fixtures mounted similarly. However, I come up short when I search for the applicable code article. Am I imagining it?

Top
2014 / 2011 NEC & Related Books and Study Guides
#78374 - 09/12/01 07:33 PM Re: Cover mounted fixtures
John Steinke Offline
Member

Registered: 04/03/01
Posts: 509
Loc: Reno,Nv., USA
I've recently had to re-fit several new lights to older construction; I know just the situation you describe. It's especially vexing when the wall is masonry, with a "handy box" set in it- there's not much to work with, and you really don't want to tear up the wall!
Anyway, I'd really like some code guidance as well as "tips & tricks" from you guys!

Top
#78375 - 09/13/01 05:19 AM Re: Cover mounted fixtures
electure Offline

Member

Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
John W, I'd sure use the hub if possible. Not only do the 6/32s not hold well, most w/p boxes will bust out easily at the point where the box meets the strap with all the 6/32 holes in it.
John S, A couple of things I've tried:
Retap holes to 10-32 (not much help)
In masonry, remove back K/O from box, drill hole completely through wall, & use a piece of threaded rod with nuts & washers.
(Does anybody still make the fixture studs that screw to the back of the box?)

With highbays:
Swivel covers (by Appleton) with conduit stems.
If hanging from a K/O in a welded box, be sure to use the formed, and not welded, side of the box for support. I've seen the entire welded portion of a 4S box give way with a 20lb fixture attached. If not for the safety chain it would have fallen 35 ft and made a very uncomfortable hat for someone.

Top
#78376 - 09/14/01 03:53 AM Re: Cover mounted fixtures
Redsy Offline
Member

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
Thanks for the input. As I said, I think I remember reading this in the code. I can't seem to find it though.

Top
#78377 - 09/14/01 03:31 PM Re: Cover mounted fixtures
sparky Offline
Member

Registered: 10/18/00
Posts: 5545
Redsy;
370-27(a)EX ???

Top
#78378 - 09/14/01 05:58 PM Re: Cover mounted fixtures
Redsy Offline
Member

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
Sparky,
That must be it. Thanks!
I guess that means a wall sconce or entrance light weighing less than 6 lbs. may be mounted on a single gang device box. Could it actually be argued that a 3 hub WP coverplate on a single gang WP box is "designed for the purpose"? It still relies on the 2 #6 screws. A round box with the #8s is a safer bet, but I'll use the hubs on the box to be sure.

Top
#78379 - 09/15/01 05:04 PM Re: Cover mounted fixtures
Redsy Offline
Member

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
Sparky,
I finished today, and replaced the old box and fixture. I used the hub instead and although "the other one was fine for 15 years", I'm glad I change it.
BTW,
I had to use a threaded Killark street 90 to get the back of the fixture to clear the wall.

Top
#78380 - 09/18/01 03:59 PM Re: Cover mounted fixtures
sparky Offline
Member

Registered: 10/18/00
Posts: 5545
Good man Redsy.
i take it whole arguement is screw size vs. fixture wieght. I was crusin' the NEC for that recent change ( 99'??) that allows us to use cieling mounted boxes for the same rationale, no soap as yet...

Top



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