I had a customer call with a reasonable request- now, how do I solve the problem?
In this warehouse, out in the middle of the floor, they have a desk and file cabinet. The power that they need here, and the time clock that they use, rely upon a 1/2" piece of EMT dropped down from the ceiling. Receptacles are set in 4-square boxes on the EMT. The entire thing is supported by zip-ties to an air line. The customer's request: could I do it a little better?
The roof truss above looks to be 20-25 ft. up. Four Squares poking out from the EMT just seem to beg to get bumped into. Conventional power poles seem to be out of the question, because 1_ they aren't tall enough. 2) they really aren't supported that well anyway, and 3) the receptacles are in the wrong places.
How would drop power to this location? Oh- I forgot to mention- I also ned to mount a speaker/horn about ten feet up.
I've seen 10' lengths of strut butted together with a joiner bracket ran up to the ceiling. It was then bolted to another piece of strut spanning the trusses. The installer brought his pipe down the side of the strut with minerallac straps.
Tall strut back-to-back, use both as a raceway...one for power, the other for your speaker/phone. By using two pieces instead of pre-made double strut, you can stagger the connections...start at the ground with a 10' stick, and a 5' stick, so you'll have a joint every 5' in every other piece. Make sure you use all of the fittings that are meant for using strut as a raceway, not the usual 4 hole straps that are normally used.
Put bollards around the base to help with any fork/vehicle traffic.
How far out in the middle is the middle? Get out that concrete saw and drop a conduit down into the slab. Run it up a side wall someplace where you can feed it with power. As far as the horn goes, Bolt a 2-1/2" floor flange to the floor. Screw in a 10" length of 2-1/2" grc. Run your wiring for the horn up the middle of that in MC . Think different.