Re: So, what are some warning signs that a stage may be unsafe?
Silas,
NEC 520.68(A) Exception 4
-6m maximum link of SJ-derivative cords in the form of breakout.
-Must be supported over entire length off the ground by "pipe, truss, tower, or other substantial support."
-Must connect a single multipole connector containing at least two circuits to multiple two pole, 3 wire connectors.
-Overcurrent device must not exceed 20A.
This essentially describes Socapex breakouts off the ground and tied to the tent or lighting truss.
I don't have the handbook readily available, but I think a Socapex breaking (i.e. 2 pole, 3 wire to single multipole) is also probably legal when connected to a support structure, as it is the reverse of the outlined.
There is no provision for a SJ-jacketed extension cord of the configuration we normally think of as an extension cord.
