Chapter 7 Luminaires, Ballasts, and Lamps Flashcards
Is it permissible to install a recessed luminaire directly against wood ceiling joists when the label on the luminaire does not indicate that the luminaire is suitable for insulation to be in direct contact with the luminaire? This is a Type Non-IC fixture.
No, NEC 410.116(A)(1)
If a recessed luminaire without an integral junction box is installed, what extra wiring must be provided?
tap conductor shall be permitted to run from the luminaire terminal connection to an outlet box placed at least 1 ft from the luminaire [NEC 410.117(C)]
Thermal insulation is not permitted to be installed within - - - in. (mm) of the top or - - - in. (mm) of the side of a recessed luminaire unless the luminaire is identified for use in direct contact with thermal insulation. This is a Type Non-IC fixture.
3 in. , 3 in.
Recessed luminaires are available for installation in direct contact with thermal insulation. These luminaires are required to be marked “Type — .”
Type IC
Unless specifically designed, all recessed incandescent luminaires must be provided with factory-install —
Thermal Protection
Plans require the installation of surface-mounted fluorescent luminaires on the ceiling of a recreation room that is finished with low-density ceiling fiberboard. What sort of mark would you look for on the label of the luminaire?
“Suitable for surface Mounting on low density Cellulose Fiberboard” [NEC 410.136(B)]
A recessed luminaire bears no marking indicating that it is “Identified for Through-Wiring.” Is it permitted to run branch-circuit conductors other than the conductors that supply the luminaire through the integral junction box on the luminaire?
No, [NEC 410.21]
Fluorescent ballasts for all indoor applications must be - - - type. These ballasts contain internal - - - protection to protect against overheating.
Class P Ballast / Thermal
Additional backup protection for ballasts can be provided by connecting a(n) - - - with the proper size fuse as recommended by the ballast manufacturer.
a capacitor
You are called upon to install a number of luminaires in a suspended ceiling. The ceiling will be dropped approximately 8 in. (200 mm) from the ceiling joists. Briefly explain how you might go about wiring these luminaires.
- complete all of the wiring above the ceiling using conventional wiring method
- then, a flexible connection (AC, MC, MN, FMC, LFMC, LFNC, ENT…) not more than 6 ft long is made between the outlet box and the luminaires
The Code places a maximum open-circuit voltage on lighting equipment in or on
homes. This maximum voltage is (600) (750) (1000). (Circle the correct answer.)
Where in the NEC is this voltage maximum referenced?
1000
NEC 410.140(B)
The letter “E” in a circle on a ballast nameplate indicates that the ballast
Ballasts that meet or exceed the federal standards for energy savings are marked with a letter “E” in a circle.
A 120-volt lamp fluorescent ballast for two 40-watt lamps is marked 85 volt-amperes.
What is the power factor of the ballast?
Lamp watt = 40 watts x 2 =80
power factor = 80/85 = .94
Can an incandescent lamp dimmer be used to control a fluorescent lamp load?
An incandescent lamp dimmer can not be used to control a fluorescent lamp load.
A good “rule-of-thumb” to estimate the expected life of a motor, a ballast, or other electrical equipment is that for every - - - °C above rated temperature, the expected life will be cut in - - -.
10 / half
