When should metal or plastic conduit be used?

Question

When should metal or plastic conduit be used?

Answer 1

Just look to see what hazzards are around and choose which would be best for the use.  If in ground then plastic.  If in a building and exposed use rigid and if in the cieling of a building you can use emt.

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Answer 2

The use of metallic conduit is for use were every box is to be grounded to the electrical panel. It would serve as a bare ground and remove the need for a second ground. The PVC conduit (Grey only) is best where it is to be in the weather and makes a cheaper more waterproof shielding. Metal will rust over time. PVC will not.