Deck 15: Luminaires

Question 1

What are the requirements for multiwire branch circuits?

Answer 1

Per NEC 210.4, the requirements for multiwire branch circuits are:
1.All conductors of the multiwire branch circuit must originate in the same panelboard.
2.The disconnecting means must simultaneously disconnect all ungrounded conductors at the panelboard.In most cases, this is a circuit breaker(s).
3.The multiwire branch circuit must supply only line-to-neutral loads if the luminaires are connected line-to-neutral.
4.In the panelboard, the conductors that constitute a multiwire branch circuit is required to be grouped by tie wraps, tape, or similar means.This grouping of conductors does not have to be done when it is obvious where the conductors belong, such as a raceway that contains only one multiwire circuit with one grounded neutral conductor, or Type AC or Type MC cable.

Question 2

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

Answer 2

A

Question 3

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

Answer 3

The new laws in these states simply require that lamps in permanently installed luminaires:
∙ have high efficacy rating (high lumens per watt), or
∙ be controlled by occupancy sensors, or
∙ have a combination of lamp efficacy, occupancy sensor control, and/or dimmers.
Cord-connected floor or table lamps are not governed by current energy conservation laws.Most fluorescent lamps with energy savings ballasts, compact fluorescent lamps (CFLs), LEDs, and halogen lamps meet this high-efficacy requirement.Conventional incandescent lamps do not.

Question 4

Describe the rules governing the disconnecting means for fluorescent luminaires.

Question 5

Multiwire branch circuits are defined in NEC Article 100 as a branch circuit that consists of two or more conductors that have a voltage between them, and a grounded conductor that has equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system.

A)"hot"
B)grounded
C)ungrounded
D)semi-

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

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

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

Question 8

Recessed luminaires are usually supported by that are attached to the luminaires' rough­in box.

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

Question 9

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

Question 10

All recessed incandescent luminaires must be equipped with factory-installed thermal protection, unless the luminaire is identified for use and installed in .

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

Question 11

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

Question 12

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 13

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 14

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 15

Why are there special requirements for clothes closets?

Question 16

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

Question 17

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 18

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

A)tacks
B)rivets
C)grid elements
D)flexible cables

Question 19

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 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