Would it be allowed to support a 4 inch square (1900) box with threaded rod? The box contains a single receptacle, (110v)
The threaded rod is approx. 10' long, suspened from the steel work above. The box does sway (move) with the rest of the conduit when disturbed.
In the NEC, they talk about the box shall be securely fastened. Does that mean, no movement at all?
Then the job would need extra bracing. There are approx. 20 boxes. There is 3/4" rigid conduit installed between boxes.