MV cable raceway question.

[WCEI]

I was having a discussion with a friend in the trade today and he told me about a dilemma one of his customers was having. I’m only giving the Readers Digest version of the scenario.

Electrician ran 4”rigid and transitioned to Sealtite to the gear. Voltage is 4160 nominal. The question was is sealtite legal for this application.
300.37 appears to permit other raceways if “identified.” Of course, the same criteria would have to be applied to all fittings. Or so it seems to me.

Am I off base here? Are there other code articles that provide a clearer guidance?

Thanks gang.

WC

 

[infinity]

In the NEC are there voltage limitations on other types of raceways like RMC, EMT, or IMC? I don't believe that there are so the same would apply to LFMC which also has no voltage NEC limit. But there may be a listing limitation as to the highest voltage permitted for LFMC. For some reason I thought that the maximum voltage was 600 volts unless used for signs or some other exceptions. 311.32 allow MV cables in raceway up to 35Kv.

311.32 Uses Permitted. Type MV cable shall be permitted for use on power systems rated up to and including 35,000 volts, nominal, as follows:
(1) In wet or dry locations.
(2) In raceways

 

[don_resqcapt19]

In the proposed Table 305.12(A) for the 2026 code, it shows LFMC as suitable for installations over 1000 volts. The scope of Article 305 is the general wiring methods for systems over 1000 volts ac or 1500 volts dc.
This was a second draft change and the panel statement in accepting PC-1720 said:
"

Table 305.12(A) has been updated to reflect the addition of liquidtight flexible metal conduit and flexible metal conduit which are common wiring methods used within this voltage range.