ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
VDE 0100 to introduce AFCIs
by sparky. 01/16/18 06:36 PM
Air Compressor feeder conductor sizing
by Potseal. 01/15/18 09:08 PM
Under carpet cable?
by HotLine1. 01/15/18 09:57 AM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 19 guests, and 7 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Fixture Supports in Suspended Ceilings #103758
11/21/02 01:53 PM
11/21/02 01:53 PM
Joe Tedesco  Offline OP
Member
Joined: Oct 2000
Posts: 2,749
Boston, Massachusetts USA
[Linked Image]


Joe Tedesco, NEC Consultant
2017 / 2014 NEC & Related Books and Study Guides
Re: Fixture Supports in Suspended Ceilings #103759
11/23/02 01:00 AM
11/23/02 01:00 AM
J
Jacuzzi Guy Electric  Offline
Member
Joined: Oct 2002
Posts: 33
Dearborn Heights Michigan Unit...
Shouldn't those be attached to the ceiling, by a chain? Or are they just sitting on top of the drop ceiling?

They look mighty heavy for that weak drop ceiling.


[This message has been edited by Jacuzzi Guy Electric (edited 11-23-2002).]

Re: Fixture Supports in Suspended Ceilings #103760
11/23/02 06:37 AM
11/23/02 06:37 AM
L
lwinter31  Offline
Member
Joined: Nov 2002
Posts: 40
Texas
Joe
I dont see "any" support wires in this pic.
What are we supposed to rip our shirts on in this ceiling. [Linked Image]

Re: Fixture Supports in Suspended Ceilings #103761
11/23/02 11:57 AM
11/23/02 11:57 AM
G
golf junkie  Offline
Member
Joined: Apr 2001
Posts: 507
York, NE
Joe,
As a contractor in the midwest, (low earthquake risk), I believe that troffers can be safely supported by the ceiling grid.

The local AHJ requires support wires within 6" of all four corners of the fixture. That requirement varies depending upon the area, state or local inspection.

I haven't seen a new troffer without built-in grid clips for about five years.

GJ

Re: Fixture Supports in Suspended Ceilings #103762
11/26/02 08:28 PM
11/26/02 08:28 PM
J
John Steinke  Offline
Member
Joined: Apr 2001
Posts: 518
Reno,Nv., USA
Here's where architects earn their keep. A check of the appropriate UL directories will show numerous fire-rated suspended ceilings, where the ceiling grid supports the troffers. That means that, even after a fire test, the troffers remained in the grid- even if the grid was warped and twisted like a pretzel. Remember the words "according to the manufacturers' instructions."
The UL tests do not take into account earthquake requirements- only fire.

Re: Fixture Supports in Suspended Ceilings #103763
11/26/02 08:40 PM
11/26/02 08:40 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,916
Brick, NJ USA
For what it's worth...
We install drop wires for the troffers, usually get the ceiling contractor to install "extras" for the fixtures, and any cabling that requires support.
The fixtures get a drop wire on each corner, and dependent on the local AHJ, some locations get "screwed/clipped" to the grid...some don't. The drop wire we use for cabling support gets a Caddy "yellow placement clip" to "secure" the drop wire to the grid.
When ductwork gets in the way, we improvise as needed, EMT trapeeze, etc., etc. Hell we've been known to use a tin knockers support strap a few times.
John


John

Featured:

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

 

Member Spotlight
Radar
Radar
Los Angeles, CA
Posts: 349
Joined: April 2004
Show All Member Profiles 
Top Posters(30 Days)
sparky 23
Admin 20
Potseal 13
Popular Topics(Views)
243,515 Are you busy
180,312 Re: Forum
170,808 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.019s Queries: 14 (0.003s) Memory: 0.9750 MB (Peak: 1.1219 MB) Zlib enabled. Server Time: 2018-01-17 05:12:40 UTC