RCDD · Question #78
Which of the following types of conduit uses set screw couplings and connectors?
The correct answer is B. EMT. EMT (Electrical Metallic Tubing) is distinguished from other conduit types by its use of set screw or compression-type couplings and connectors rather than threaded fittings.
Question
Which of the following types of conduit uses set screw couplings and connectors?
Options
- ARMC
- BEMT
- CIMC
- DSchedule 80 PVC
How the community answered
(26 responses)- A12% (3)
- B81% (21)
- C4% (1)
- D4% (1)
Why each option
EMT (Electrical Metallic Tubing) is distinguished from other conduit types by its use of set screw or compression-type couplings and connectors rather than threaded fittings.
RMC (Rigid Metal Conduit) has thick enough walls to be threaded and uses threaded couplings and connectors, not set screw fittings.
EMT has thin walls that cannot be threaded, so it relies on set screw or compression fittings to mechanically clamp onto the outside of the tubing to join sections and connect to enclosures. This is a defining characteristic that differentiates EMT from heavier conduit types. NEC Article 358 governs EMT installation and specifies the use of these unthreaded fitting types.
IMC (Intermediate Metal Conduit) is also threaded and uses threaded couplings, similar to RMC, rather than set screw connections.
Schedule 80 PVC conduit sections are joined using solvent cement (primer and glue), not mechanical set screw fittings.
Concept tested: EMT conduit coupling and connector type
Source: https://www.nfpa.org/codes-and-standards/nfpa-70-standard-development/70
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