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Conduit wiring is synonymous to wires in a pipe.
For underground conduit runs, PVC is by far the better of the two conduit systems.
The Conduit happened in 2009.
No, the conduit has to be supported individually from a supportive structure. The spacing of the strapping is related to the size of the conduit.
Steel conduit weighs more, provides more protection, and costs more than plastic conduit.
Plastic conduit weighs less, is easier to work with, and costs less than steel conduit.