Hi,
Is it a requirement that raceways entering metal enclosed switchgear over 600 VAC be in rigid conduit or can I come from a transformer to a 4160 switch with duct bank comprised of PVC and bell end reducers?

Here is an article on this:
http://books.google.com/books?id=h2...ge&q=NEC%20Article%20490&f=false

Thanks

Greg

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