QuestionJuly 11, 2025

Rigid metal conduit shall NOT: 1. use threadless couplings. 2. use running threads at couplings. 3. be permitted as an equipment grounding conductor. 4. require a bushing when entering a box.

Rigid metal conduit shall NOT: 1. use threadless couplings. 2. use running threads at couplings. 3. be permitted as an equipment grounding conductor. 4. require a bushing when entering a box.
Rigid metal conduit shall NOT:
1.
use threadless couplings.
2.
use running threads at couplings.
3.
be permitted as an equipment grounding conductor.
4. require a bushing when entering a box.

Solution
4.7(338 votes)

Answer

3. be permitted as an equipment grounding conductor. Explanation Rigid metal conduit (RMC) must adhere to specific installation standards. Threadless couplings are not allowed, and RMC cannot serve as an equipment grounding conductor. However, it does require bushings when entering a box to protect the wire from damage.

Explanation

Rigid metal conduit (RMC) must adhere to specific installation standards. Threadless couplings are not allowed, and RMC cannot serve as an equipment grounding conductor. However, it does require bushings when entering a box to protect the wire from damage.
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