Theater: Cable type for circuts under raised floor

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humhead

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I searched to find out what type of cable is required for my application, however I have found no results. Here is the scenario.

There are existing floor mounted receptacles which are fed from a central dimmer rack. There are four 20A twistlok receptacles per box, which are each fed with 10g stranded wire (hot, neutral) and all share a common ground wire. The individual wires are fed into conduit and back to the rack.

We would like to add another identical box in another location about 30 feet away. The new circuits would daisy off the current receptacles and the new cables will be run under a permanent raised floor. Running conduit is not practical, so we would like to use some kind of armor or metal-clad cable. Any suggestions on what specifically to use, as there seems to be special requirements for theatrical applications? AC, MC etc?

Thanks in advance
 
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