Journeyman Electrician’s Exam Journeyman Electrician's Lighting and Luminaires 2 — Questions and Answers
Question 1: An outlet box used to support a luminaire weighing more than 50 pounds must be:
- A metal box secured with a minimum of four mounting screws
- Supported independently of the branch circuit wiring
- Listed and marked for the weight to be supported (Correct answer)
- Bolted directly to a structural framing member
Correct answer: Listed and marked for the weight to be supported
NEC 314.27(A)(2) requires that outlet boxes used to support luminaires weighing more than 50 pounds be listed and marked for the specific weight to be supported, ensuring structural adequacy.
Question 2: Non-IC rated recessed luminaire housings must maintain a minimum clearance of _____ from combustible material on all sides.
- 1/4 inch
- 1/2 inch (Correct answer)
- 1 inch
- 2 inches
Correct answer: 1/2 inch
NEC 410.116(A)(1) requires non-IC rated recessed luminaire housings to be spaced so that there is not less than 1/2-inch clearance on all sides from combustible material.
Question 3: Emergency lighting systems required by the NEC must provide illumination for a minimum of:
- 30 minutes
- 60 minutes
- 90 minutes (Correct answer)
- 120 minutes
Correct answer: 90 minutes
NEC 700.12 requires emergency lighting systems to provide at least 1-1/2 hours (90 minutes) of illumination upon loss of normal power to allow safe egress from the building.
Question 4: Conductors at the outlet box that supply a luminaire must have an insulation temperature rating of not less than:
- 60 degrees C (140 degrees F)
- 75 degrees C (167 degrees F) (Correct answer)
- 90 degrees C (194 degrees F)
- The same rating as all other branch circuit conductors in the raceway
Correct answer: 75 degrees C (167 degrees F)
NEC 410.117(C) requires that conductors at the point of connection to luminaire wiring have an insulation temperature rating of not less than 75 degrees C due to the elevated temperatures present in luminaire outlet boxes.
Question 5: A luminaire listed for wet locations and installed outdoors must be constructed and installed so that:
- It is GFCI protected on a 20-ampere circuit
- Water cannot enter or accumulate in wiring compartments or lamp sockets (Correct answer)
- The lamp can be accessed without tools for field replacement
- It faces downward to prevent water pooling on the fixture
Correct answer: Water cannot enter or accumulate in wiring compartments or lamp sockets
NEC 410.10(A) requires that wet location luminaires be constructed and installed so that water cannot enter or accumulate within electrical parts such as wiring compartments, lampholders, or other components.
Question 6: Lighting track (NEC Article 410, Part XIV) is prohibited from installation in all of the following EXCEPT:
- In wet or damp locations without a wet/damp location listing
- Where subject to severe physical damage
- Within the zone of a bathtub or shower
- In a dry commercial office ceiling (Correct answer)
Correct answer: In a dry commercial office ceiling
NEC 410.151(A) prohibits track lighting in wet/damp locations, where subject to physical damage, and within bathtub/shower zones, but does not restrict installation in dry interior commercial areas.
Question 7: According to NEC 410.130(G), the disconnecting means for fluorescent luminaires must disconnect:
- Only the ungrounded (hot) conductors supplying the ballast
- The ballast independently of the lampholders
- All conductors simultaneously, including the grounded conductor (Correct answer)
- The branch circuit only at the panelboard
Correct answer: All conductors simultaneously, including the grounded conductor
NEC 410.130(G) requires that the disconnecting means for fluorescent luminaires simultaneously disconnect all conductors, including the grounded conductor, to fully de-energize the luminaire during maintenance.
Journeyman Electrician’s Exam Journeyman Electrician's Lighting and Luminaires 2
An outlet box used to support a luminaire weighing more than 50 pounds must be: