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
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
Earthquake in New Zeeland
by RODALCO
11/27/16 11:25 PM
Calling all Non-US members!! (Non-US only)
by Tjia1981
11/27/16 06:33 AM
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
1 registered (sparkyinak), 245 Guests and 4 Spiders online.
Key: Admin, Global Mod, Mod
Page 1 of 2 1 2 >
Topic Options
Rate This Topic
#57497 - 10/16/05 06:36 AM Hanging Metal Halide fixtures
coachman Offline
Member

Registered: 12/06/01
Posts: 13
Loc: Cherry Hill, NJ, USA
I am installing 400watt metal halide fixtures in a wharehouse with concrete ceilings & concrete beams. What type anchor for the boxes should I be using?

Top
Work Gear for Electricians and the Trades

Work Gear for Electricians and the Trades
Work Gear for Electricians and the Trades
Arc Flash Clothing, Gloves, KneePads, Tool Belts, Pouches, Tool Carriers, etc. etc....

#57498 - 10/16/05 07:09 AM Re: Hanging Metal Halide fixtures
earlydean Offline
Member

Registered: 12/22/03
Posts: 749
Loc: Griswold, CT, USA
I have had success in the past with lead anchors. They require a set-tool, but they do get a good grip on the inside of the concrete hole.
Another option is epoxy.
_________________________
Earl

Top
#57499 - 10/16/05 07:51 AM Re: Hanging Metal Halide fixtures
Cow Offline
Member

Registered: 07/01/05
Posts: 33
Loc: Hermiston, OR
1/4 inch wedge anchors(red heads) would hold well also, although lead anchors are quicker and easier to install.

Top
#57500 - 10/16/05 08:34 AM Re: Hanging Metal Halide fixtures
Tiger Offline
Member

Registered: 05/04/05
Posts: 714
Loc: Crystal Lake, IL USA
Just a note that these fixtures have some hazards. I'm considering alternate fixtures on my commercial projects.

Dave

Top
#57501 - 10/16/05 08:46 AM Re: Hanging Metal Halide fixtures
Redsy Offline
Member

Registered: 03/28/01
Posts: 2138
Loc: Bucks County PA
coach,

Keep in mind that some concrete ceilings consist of pre-cast slabs, which often have hollow portions.
If thats the case, you may need toggles, or t-anchors.

Top
#57502 - 10/16/05 03:02 PM Re: Hanging Metal Halide fixtures
sierra electrician Offline
Member

Registered: 02/12/05
Posts: 220
Loc: North Fork, CA USA
Lead anchors and wedge's work good for supporting a box. I hope your not planning to hang the fixture from that box, if so epoxey might be better. I has a much higher pull rateing.

Rob

Top
#57503 - 10/16/05 06:56 PM Re: Hanging Metal Halide fixtures
Jps1006 Offline
Member

Registered: 01/22/04
Posts: 609
Loc: Northern IL
I prefer the wedge because the load will continue to "wedge" or put pressure on the frictional surfaces. I have had inspectors in the past disallow lead as support means in this type of application because in fire they would melt at a lower temp and become one more hazard for the firemen.

Top
#57504 - 10/16/05 07:40 PM Re: Hanging Metal Halide fixtures
dmattox Offline
Member

Registered: 10/20/04
Posts: 267
Loc: Anaheim, CA
Did a google search and I found this site that compares concrete anchors. The only 2 that are rated for heavy duty are: http://www.confast.com/products/concrete-strike-anchor.asp
http://www.confast.com/products/thunderstud-anchor.asp

I use the later all the time. Can be a bit of a nightmare if you screw them. But, they hold really well.

Never tried the first one, it looks kinda interesting though.

Look at the ratings though, 900lbs+ using the 1/4". Plenty strong for a fixture as long as the concrete is in good shape.

[This message has been edited by dmattox (edited 10-16-2005).]

Top
#57505 - 10/16/05 07:59 PM Re: Hanging Metal Halide fixtures
electure Offline

Member

Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
Be sure to find out beforehand if you've got a "post-tension" concrete structure before selecting any anchors.
Post-tension decks can only have anchors that are very shallow without x-raying the deck and getting a structural engineer's OK.

If that's the case, Hilti makes some 3/8" slugs that will do the trick.

Top
#57506 - 10/17/05 05:20 AM Re: Hanging Metal Halide fixtures
e57 Offline
Member

Registered: 05/27/03
Posts: 2837
Loc: S.F.,CA USA
Ditto on knowing the contruction of the cieling. I was in a building where the sprinkler installer hit a post tension cable, and sent it half way out the side of the building. They had to have re-engineering of the floor loading, after X-raying most of the floor.

Hilti makes a really expensive heavy duty under-cutting anchor that is great for this, but check around, 'cause Hilti has some licensed under other names that are less expensive, and the same product. for instance Toggler (TM) is the same as the Hilti toggle bolt, but 3X as much.

And if you use epoxy, blow out the hole, or you're just sticking to dust.
_________________________
Mark Heller
"Well - I oughta....." -Jackie Gleason

Top
Page 1 of 2 1 2 >



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