ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat Box
Recent Posts
New tool
by gfretwell - 10/24/20 11:09 AM
Where is Everyone?
by Bill Addiss - 10/17/20 07:04 PM
New in the Gallery:
Facebook follies, bad wiring
FPE in Germany pt.2
Who's Online Now
0 registered members (), 20 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Cover mounted fixtures #78373 09/12/01 06:45 PM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline OP
Member
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?

2017 / 2014 NEC & Related Books and Study Guides
Re: Cover mounted fixtures #78374 09/12/01 10:33 PM
Joined: Apr 2001
Posts: 518
J
John Steinke Offline
Member
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!

Re: Cover mounted fixtures #78375 09/13/01 08:19 AM
Joined: Dec 2000
Posts: 4,283
electure Offline
Member
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. [Linked Image]

Re: Cover mounted fixtures #78376 09/14/01 06:53 AM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline OP
Member
Thanks for the input. As I said, I think I remember reading this in the code. I can't seem to find it though.

Re: Cover mounted fixtures #78377 09/14/01 06:31 PM
Joined: Oct 2000
Posts: 5,389
S
sparky Offline
Member
Redsy;
370-27(a)EX ???

Re: Cover mounted fixtures #78378 09/14/01 08:58 PM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline OP
Member
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.

Re: Cover mounted fixtures #78379 09/15/01 08:04 PM
Joined: Mar 2001
Posts: 2,056
R
Redsy Offline OP
Member
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.

Re: Cover mounted fixtures #78380 09/18/01 06:59 PM
Joined: Oct 2000
Posts: 5,389
S
sparky Offline
Member
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... [Linked Image]


Featured:

2020 National Electrical Code
2020 National Electrical
Code (NEC)

* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
sparky66wv
sparky66wv
West Virginia
Posts: 2,236
Joined: November 2000
Show All Member Profiles 
Top Posters(30 Days)
Popular Topics(Views)
271,014 Are you busy
205,010 Re: Forum
193,127 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.3