Septic Drain Pipe for Conduit

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lj said:
I just saw an unusual pipe material used as conduit on a feeder to a 400A safety switch. The 4" corrugated plastic pipe was a septic drain pipe, and the fitting at the switch enclosure was a 4" PVC plumbing elbow. This sure seems to be an NEC violating, but I cannot point to a reference other than 110.3(A)(1) on "suitable for installation." Is there a better NEC reference that prohibits installations like this, or is it actually acceptable to protect conductors in this manner? Thanks and Happy Thanksgiving.
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Are the conductors within suitable for direct burial?

If so that would not be a raceway .... just a sleeve.
 
"Are the conductors within suitable for direct burial?"

This is an interesting point. I don't know if the conductors are suitable for direct burial. However, even if they are USE or UF, it seems they should still be subject to NEC 305.5(D), which requires a proper raceway where they emerge.
 
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