Deck 15: Luminaires

Question 1

Describe the rules governing the disconnecting means for fluorescent luminaires.

Answer 1

NEC 410.130(G)requires a means shall be provided for disconnecting fluorescent luminaires that have double-ended lamps and ballast(s). This requirement is for the safety of those having to work on the luminaire, such as changing out a ballast or socket. The disconnecting means is permitted to be inside or outside of the luminaire. If outside of the luminaire, it must be within sight of the luminaire.
Two-wire branch circuit: The disconnecting means is required to disconnect the ungrounded conductor supplying the ballast.
Multiwire branch circuit: The disconnecting means is required to simultaneously disconnect all conductors supplying the ballast, including the grounded conductor.

Question 2

Incandescent, open, or ____ lamps in lampholders; pendant luminaires; and pendant lampholders are not permitted in clothes closets.

A)recessed
B)surface-mounted
C)partially open
D)enclosed

Answer 2

C

Question 3

It is necessary that the illumination of a building comply with energy codes. These codes usually evaluate the illumination on the basis of the average ____ per square foot (meter)of illumination load.

A)watts
B)volt-amperes
C)lumens
D)candelas

Answer 3

A

Question 4

What are the requirements for multiwire branch circuits?

Question 5

What are the stipulations relevant to lamps in new energy conservation laws that have been enacted in some states?

Question 6

Type ____ luminaires are permitted to be installed in direct contact with thermal insulation.

A)IIC
B)IC
C)RC
D)XC

Question 7

Beginning with the 2008 edition of the National Electrical Code , the term luminaire is used exclusively. Previous editions of the NEC used the term luminaire followed by the term ____ in parentheses.

A)lamp
B)lighting source
C)fixture
D)lightbulb

Question 8

Most fluorescent lamps with energy savings ballasts, compact fluorescent lamps (CFLs), LEDs, and halogen lamps meet high-efficacy requirements. ____ do not.

A)Most fluorescent lamps with energy savings ballasts
B)Conventional incandescent lamps
C)Compact fluorescent lamps
D)Halogen lamps

Question 9

For surface-mounted and pendant-hung luminaires, support rods should be placed so that they extend about ____ in. below the finished ceiling.

A)one
B)two
C)three
D)four

Question 10

What are the guidelines for recessed incandescent luminaires not marked IC?

Question 11

A(n)____ branch circuit must supply only line-to-neutral loads if the luminaires are connected line-to-neutral.

A)multiwire
B)regular
C)irregular
D)dual-wire

Question 12

Recessed luminaires should be securely fastened to the ceiling framing members using bolts, screws, or ____.

A)tacks
B)rivets
C)grid elements
D)glue

Question 13

For fluorescent and HID luminaires, the volt-ampere allowance is based on the rating of the ____.

A)ballast
B)filament
C)tubing
D)phosphor

Question 14

Both incandescent and fluorescent recessed luminaires are marked with the temperature rating required for the ____ if more than 60 degrees C.

A)insulation
B)mounting box
C)supply conductors
D)ceiling

Question 15

Recessed incandescent luminaires not marked Type IC and those marked for installing directly in ____ must not have insulation over the top of the luminaire.

A)copper
B)aluminum
C)stainless steel
D)poured concrete

Question 16

The installation of luminaires, lighting outlets, and supports is covered in Article 410 of the NEC . Article 410 sets forth the basic requirements for the installation, commonly referred to as the "____."

A)light-up
B)grounding
C)pre-set
D)rough-in

Question 17

Why are there special requirements for clothes closets?

Question 18

Recessed luminaires are usually supported by ____ that are attached to the luminaires' rough-in box.

A)screws
B)nails
C)adjustable rails
D)outlet boxes

Question 19

Both Type THWN-2 and Type ____ conductors have an insulation temperature rating of 90 degrees Celsius and generally meet the temperature requirement for connecting luminaires.

A)THW
B)THHN
C)RHW
D)USE

Question 20

____ that have the light source completely enclosed are permitted in clothes closets.

A)Incandescent open lamps in lampholders
B)Pendant luminaires
C)Pendant lampholders
D)Surface-mounted or recessed fluorescent luminaires