Getting things arranged in my new (new for me) shop. It has 3 phase power,
therefore the questions.

1) Do I simply run 3 wires to the machines (lathe, mill, grinder & surface
grinder) and let the conduit be the ground, or do I need a seperate ground
wire. The existing building has a few 3ph outlets (in conduit), but no
ground wires.

2) My machines will be out in the middle of the floor. Do I simply dangle a
conduit from the roof framing (15 ft. above), or, do I install a post upon
which the conduit will come down? Do I do this once for each machine?
Somebody must have a clever solution to this situation. I don't want to cut
up my slab and install wires below.

Thanks for any and all answers.

Ivan, amateur relocated to Oregon.