The two main types of metallic conduit and raceway are rigid and flexible. Rigid conduit offers solid protection. Flexible metal conduit allows for bends and twists without using extra hardware.
Prewired conduit, or armored cable, offers an all-in-one solution with the wires already running through it. Metal electrical boxes must be used with metal conduit.
Rigid metallic conduit is most often used in commercial applications. It can also be a smart choice for straight runs of wire or cable through an attic, garage, basement or crawlspace. It protects against nicks, cuts and punctures to wiring from accidents or chewing animals.
Examples of rigid metallic raceways are:
Flexible metal conduit allows for bends and twists without the use of extra hardware. It allows for turns at corners without using elbow joints.
Tip: Running a green grounding wire is recommended when using conduit. However, electrical code may allow the metal conduit itself to serve as grounding conductor.
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