Master Electrician Exam (NEC)Special Occupancies, Equipment, and ConditionsEasy
A master electrician is installing a new elevator in a commercial building. The elevator machine room requires specific lighting. According to NEC Article 620, what is the minimum illumination level required at the floor level in the elevator machine room?
- A15 foot-candles (162 lux)
- B10 foot-candles (108 lux)
- C5 foot-candles (54 lux)
- D20 foot-candles (216 lux)
Show answer & explanationAnswer & explanation
Correct answer: B. 10 foot-candles (108 lux)
NEC 620.24(A) specifies that the minimum illumination level at the floor line for elevator machine rooms, control rooms, and control spaces shall be not less than 10 foot-candles (108 lux). This ensures adequate visibility for maintenance and emergency operations.
Why the other options are wrong
- A. This exceeds the minimum required, but 10 foot-candles is the minimum.
- C. This is below the minimum required illumination level.
- D. This exceeds the minimum required, but 10 foot-candles is the minimum.
Elevator Machine Room Illumination
Minimum lighting levels required in elevator machine rooms, control rooms, and control spaces to ensure safe operation and maintenance.
- Required by NEC 620.24(A)
- Minimum 10 foot-candles (108 lux)
- Measured at the floor level
Memory trick: Elevator rooms need enough light to see '10' fingers, not '5'.