fhelectric
Member
i have a 25' ceiling in a warehouse and i need to drop 1/2" EMT from the ceiling to the floor to power a drill press. There are no walls or vertical beams anywhere near the drill press location.....:-?
vertical strapping
- Thread starter fhelectric
- Start date
- Status
- Location
- Massachusetts
Run rigid
Run cord
Install a post of some sort to connect EMT to.
Run cord
Install a post of some sort to connect EMT to.
hotwire1955
Senior Member
- Location
- nj
Use 1/2" rigid with threaded couplings keep it at 20' (344.30(B) (3)
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
Run strut to hold it. Still needs strap every 10 feet.
fhelectric
Member
thats what I thought.. the rigid idea makes sense but couldnt find a way around strapping.. strut makes the job too costly considering i have multiple location drops.. thank you
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
I dont think rigid gets you out of strapping. You could fish MC down some EMT and that is called a wall
fhelectric
Member
If im reading correctly, i can run RMC 20' down and build strut support from the ground up for the 5 extra feet
fhelectric
Member
reading NEC (344.30(B) (3)
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
I see it often in big box stores and its not rigid or strut
Seem to use it for everything from IT to electric down one 2 inch
Seem to use it for everything from IT to electric down one 2 inch
kwired
Electron manager
- Location
- NE Nebraska
too costly compared to what? No strapping at all is least cost but we are talking about what to strap to. Strut is relatively inexpensive compared to other possibilities of what you could put there to strap to. It may be kind of flimsy if it spans 25 feet but will be cheaper than something that is not flimsy that spans this far.
I would suggest cord pendants.
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
Problem to cord pedants is subject to miss use. Legal but prefer not to use if it is fixed location. Seen at at 1 not to be named factory that had hundreds of them. Coiled up at ceiling when not needed. Needs changed every week. Many unused lay there for years.
kwired
Electron manager
- Location
- NE Nebraska
Would you rather see a properly installed cord pendant or see the end user tie up extension cord from wherever he seen as convenient (maybe even an adapter screwed into a lampholder) and drop down to where power is needed.
Anything can be misused.
What needs changed every week?
Coiled up at ceiling when not used is away from physical abuse that may exist if laying on floor when not in use. Coiled up in ceiling would be a problem.
Laying there unused for years I don't see as much of a hazard, The ones being used will get wear and tear on them. Unused ones that lay there for long time may get brittle but generally will not crack until they are flexed when someone does decide to do something with them.
Jim W in Tampa
Senior Member
- Location
- Tampa Florida
This was major factory doing work for gov. so will not disclose its name. They had no idea where many were even fed from and just kept adding to any panel that had open space. Often we set up outlets for testing new equipment for maybe a few weeks then just simply coil up till needed. More money than brains but paid the bills. When dealing in millions who cares about a few thousand.
fhelectric
Member
too costly (labor and material) for the purpose of the job. Customer can do without if its not cost effective. Theres 4 different locations to drop electrical in a proposed new layout of an existing shop. but its going to work out with 20' rigid drop and 6' strut ground up, then finish with EMT ...cord pendants? s/o cords from 25' ceiling?
kwired
Electron manager
- Location
- NE Nebraska
Check out Table 400.4. Most type S cords are suitable for use as a pendant.
Use one of these for support of pendant.
http://www.hubbellcatalog.com/wiring/catalogpages/page_T34.pdf
stew
Senior Member
- Location
- federal way,washington
a rather flimsy way but will work is to drop some 3/8 all thread with a coupling down from above and mount a couple of short pieces of strut to it with small u bolts. then strap you conduit to it. use a beam clamp above if there are beams to hit. solidify it at the bottom if possible. If not it will work juist fine.
ramsy
Roger Ruhle dba NoFixNoPay
- Location
- LA basin, CA
- Occupation
- Service Electrician 2020 NEC
Why not use one-hole strap to floor equipment? Why bother with ground-up strut if not required?
Brilliant, especially w/ Caddy straps rather than strut.stew said:
sparks2274
Member
I would install 15/8 unistrut to the steel and down to the floor. Either secure the unitstrut on the floor with a L bracket or a strut foot. Install the 3/4" emt and secure with cowboys...backed with square washers and spring nuts. I have done a application like this and it works well. Running conduit with no suports is not a good idea!
- Status