conduit support

[jvee1985]

does anyone have advice on supporting 3/4 inch EMT conduit to a finished sheet rocked ceilings without finding rafters. Can one use toggle bolts?

[Rewire]

Toggles will work but remember what goes in can be pulled out,buy a stud sensor.

[celtic]

Toggles will work but remember what goes in can be pulled out,buy a stud sensor.

What happens if the run is in a void between studs?

[Riograndeelectric]

EZ anchors work quite well in drywall




Specified for anchorage into Gypsum Wallboard

http://www.smithfast.com/ezanc.htm

The E-Z ANCOR® is a one-piece self-drilling anchor designed for optimal holding performance in gypsum wallboard.

Available in zinc or high strength engineered plastic (non conductive).

They are the ideal anchors for 3/8, 1/2 and 5/8 inch gypsum wallboard.

[LarryFine]

What happens if the run is in a void between studs?The best thing to do would be hang a piece of strut from the two joists.

[celtic]

The best thing to do would be hang a piece of strut from the two joists.

3" Strut, 3/8" hardware for 1(one) - 3/4" EMT http://forums.mikeholt.com/images/icons/icon14.gif

BTW, who is paying for this engineering marvel?
http://media.techeblog.com/images/marvelfirestone.jpg

[buddhakii]

EZ anchors work quite well in drywall




Specified for anchorage into Gypsum Wallboard

http://www.smithfast.com/ezanc.htm

The E-Z ANCOR® is a one-piece self-drilling anchor designed for optimal holding performance in gypsum wallboard.

Available in zinc or high strength engineered plastic (non conductive).

They are the ideal anchors for 3/8, 1/2 and 5/8 inch gypsum wallboard.

I think it say right on the package that they are not to be used to suspend from the ceiling.

[barbeer]

Toggles can be acceptable, but make sure they will bare the weight of what you are installing. I would not be as concerned with the 3/4 emt but whats inside of that raceway.

[LJSMITH1]

Based on UL2239's specification for straps and hangars, a 3/4" EMT strap needs to support a minimum of 100 lbs. However, manufacturers are required to guarantee 3x safety load ratings for the straps/hangars.

There are toggle bolts that will easily support 100lbs, but that is entirely reliant on the strength of the wallboard. The wallboard is the primary issue, not so much the fastener.

If this were my installation, I would find the joists and use 2" screws to attach the straps. In instances where the EMT runs parallel with the joists in places, I would use pieces of unistrut or 5/8' x 1.5" wood to bridge the joists throughout the run. It may not look pretty, but at least you are not relying on paper and gypsum to hold up your raceway.

[infinity]

IMO toggle bolts should be more than adequate for a 3/4" EMT.

[iwire]

The sheet rock manufacturers say not to support anything from sheet rock on ceilings.

[Cow]

By the time you make a 1/2" hole or so large enough for the toggle, your one hole strap will almost suck through it when you tighten it up. I would definitely try to find a rafter, or span with strut.

[stevenje]

"By the time you make a 1/2" hole or so large enough for the toggle, your one hole strap will almost suck through it when you tighten it up. I would definitely try to find a rafter, or span with strut."

If you install a fender washer between the strap and the drywall, the EMT one- hole strap will not suck into the hole that toggle bolt requires.

[luckyshadow]

the question is what type of environment ?
Prison , church classroom, high school age kids, open to the general public?

Would there be any abuse to the conduit run?

I personally have probably run tens of thousands of feet of 3/4 on sheetrock ceilings with toggle bolts using both minnies and 1 hole bands. I bought a hole saw just big enough for a toggle wing to fit through and used fender washer behind the strap like stevenje said.

[iaov]

Unistrut between the studs if you realy don't want it going anywhere. Not so much a Modern Marvel as a safe, neat and workman like install!!

[iwire]

Unistrut between the studs if you realy don't want it going anywhere. Not so much a Modern Marvel as a safe, neat and workman like install!!

Neat?

I guess that would depend on where it's being run, EMT surface mounted on a Sheetrock ceiling is ugly enough, seeing 18" of uninstrut every ten feet to support just one single 3/4" EMT is going to look awful.

[iaov]

I suppose you could paint the strut. Maybe a nice pastel.:D

[iwire]

I suppose you could paint the strut. Maybe a nice pastel.:D

:D

Perhaps some all thread and a 'Sammy' (http://www.sammysuperscrew.com/GST.htm)

http://www.sammysuperscrew.com/images/gst20.gif

into the sub floor above to support a minni?

[iaov]

Those probably would look better. My wife says shes on your side on this and there is no way to make EMT across a cieling look good.:smile:

[sparky59]

i use toggle bolts every 5' in the ceiling.

[norcal]

The sheet rock manufacturers say not to support anything from sheet rock on ceilings.


There is only 1 manufacturer of Sheetrock®..... USG.:D

[iwire]

There is only 1 manufacturer of Sheetrock®..... USG.:D

I cut my finger while working on my Zamboni®, I put a Bandaid® on it while I dried my tears with some Kleenex®. :wink:

[Mr.Sparkle]

Were you on your Rollerblades®?

[jeremysterling]

I know I'll have to change, but in the past, I've used toggles and gyp board to hold up kitchen fluorescent luminaires. From now on, I'll use Unistrut@, or Sammy screws@ and threaded rod.:smile: