Rigid Metal (PVC)
The outside tube is galvanized for corrosion protection and the inside has corrosion-resistant coating.
According to National Electric Code (US NEC or NFPA 70) Article 344 for Rigid Metal Conduit and Article 358 Electrical Metallic Tubing.
Electrical units, amps and electrical wiring, wire gauge and AWG, electrical formulas and motors.
American Wire Gauge (AWG) vs. cross sectional area converter.
Amp ratings vs. US AWG wire gauges.
Lighter and lower cost metal conduits.
Rigid Aluminum Conduit dimensions.
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