UL 2237 industrial wiring

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andrew45

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La Jolla, CA
I have an application where I would like to use some UL 2237 type wiring. This is typically used in industrial locations for sending around 480/277. The listing states that this wiring must be protected by an overload device and refers you to NFPA-79, and table 7.2.10.6, which lists 100A as the required maximum for 10AWG and 60A for 14AWG type cable. Eventually this gets connected to the building. In many cases the wiring is wholly within the control of "industrial stuff" and hence not subject to the NEC, but sometimes its easier to use fixed panels to supply it. The question is what to point to in the NEC when the electrical inspector shows up and doesn't like it, and moreover which sections to point to to allow a 40A breaker to supply the 30A continuous load that is on the 10AWG wiring.

I believe that the correct response is that:
a) The connectorized parts of the UL2237 wiring are not in the inspectors control.
b) The initial outlet is a UL 2237 device, and its "wires" are fixture wires, so those 10AWG tails are OK.
c) Any building wiring needed to supply that initial outlet can be 10AWG because:
-- 210.20 (b) referrs you to 240.4
-- 240.4 referrs you to 310.15 (d) which says you have to use 8AWG, except:
-- 310.15 (e) allows a tap which supplies "other loads" (but not regular outlets) to be sized under 210.19(4) to the actual load.

Anyone have an any experience with this can comment?
 
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