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In Part 1, we said if your secondary-circuit wiring is under 1kV, you can use any Chapter 3 wiring method suitable for the conditions. And there were a few catches.
But what if your secondary-circuit wiring is 1kV or over? If that’s the case, you must install the conductors in one of the raceways listed in 600.32(A)(1) or in metal enclosures. And you can run them in equipment listed for use with neon secondary circuits over 1kV.
As to be expected, there are some catches:
Though not expressly prohibited for systems 1kV or less, you cannot use the metal parts of a building as a secondary return conductor or equipment grounding conductor for systems greater than 1kV [600.32(A)(5)].