Can you use chase nipples with a rigid coupling to join an electrical panel to a raceway?
I would say it may be possible as long as all the fittings are listed, and the voltage is not over 250 volts to ground. Part V of 250 covers bonding.
If the panel has a NEMA 4, 6 or 12 rating, I would use a 2-piece 'Hub' with a seal (typically an O-ring) to maintain the panel's resistance against entry of liquids.
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