CSLB C-10 Electrical ContractorWiring Methods and MaterialsEasy
According to NEC 362.10, in which of the following locations may Electrical Nonmetallic Tubing (ENT) be installed without additional protective measures?
- AExposed on the exterior wall of a building where subject to physical damage
- BDirect buried in earth without concrete encasement
- CInside a spray booth classified as a hazardous location
- DConcealed within a masonry wall of a building three stories or less in height
Show answer & explanationAnswer & explanation
Correct answer: D. Concealed within a masonry wall of a building three stories or less in height
ENT is a flexible, corrugated nonmetallic raceway intended for concealed use in walls, floors, and ceilings of buildings not exceeding three floors above grade. It is not permitted in exposed locations subject to physical damage, direct burial without concrete encasement, or in hazardous locations.
Why the other options are wrong
- A. Exposed locations subject to damage require rigid protection, not ENT alone.
- B. Direct burial requires concrete encasement or a listed raceway rated for burial.
- C. ENT is prohibited in hazardous (classified) locations.
Electrical Nonmetallic Tubing (ENT)
A pliable corrugated raceway used for concealed wiring in buildings of limited height, not for exposed or hazardous applications.
- Limited to buildings 3 floors or less unless concrete-encased
- Not permitted exposed to physical damage
- Prohibited in hazardous locations
Memory trick: ENT hides inside walls, never shows its face outside