Deck 3: Boxes and Enclosures

Question 1

A luminaire that weighs more than ____ shall be supported independently of the outlet box, unless the outlet box is listed for not less than the weight to be supported.

A) 20 pounds (9 kg)
B) 30 pounds (14 kg)
C) 40 pounds (18 kg)
D) 50 pounds (23 kg)

Answer 1

D

Question 2

Equipment grounding conductor(s) or equipment bonding jumpers entering a box count as ____ unless there are more than four equipment grounding conductors. ​

A) one branch
B) one ground
C) one device
D) one conductor

Answer 2

D

Question 3

No requirement specifies the depth of a box, unless a ____.

A) branch circuit is attached
B) raceway enters the side of the box
C) locknut is present
D) raceway enters the rear of the box

Answer 3

D

Question 4

Snap switches (including dimmer switches) must be connected to a(n) ____ and must also provide a means to connect metal faceplates to the equipment grounding conductor, even if a metal faceplate is not installed.

A) equipment grounding conductor
B) bonding jumper
C) switch mounting strap
D) non-metallic yoke

Question 5

Box calculations for 4 AWG and larger conductors (1000 volts or less) are performed based on the ____.

A) volume of the box
B) size and number of raceways
C) number of rings and the volume of the box
D) branch circuit load

Question 6

Conduit body support must be ____.

A) grounded
B) non-metallic
C) connected to a raceway
D) rigid and secure

Question 7

The maximum number of conductors applies only if the box does not contain any ____.

A) markings
B) fittings or devices
C) splices or fittings
D) branches

Question 8

The weight supported by any single conduit shall not exceed ____.

A) 10 pounds (5 kg)
B) 20 pounds (9 kg)
C) 25 pounds (11 kg)
D) 30 pounds (14 kg)

Question 9

Volume in boxes can be increased by using ____ rings, domed covers, extension rings, or similar items.

A) plaster (mud)
B) polymer
C) hybrid
D) drilled

Question 10

Nonmetallic-sheathed cable not fastened to the box must be secured within ____ of the box.

A) 2 in.(51 mm)
B) 6 in.(152 mm)
C) 8 in.(204 mm)
D) 10 in.(254 mm)

Question 11

Volume shall be marked on all nonmetallic boxes and boxes with a volume of ____ or less.

A) 50 in.³ (819 cm³)
B) 75 in.³ (1229 cm³)
C) 90 in.³ (1475 cm³)
D) 100 in.³ (1650 cm³)

Question 12

Inspection of the connections between luminaire conductors and circuit conductors must be possible without ____.

A) having to disconnect any part of the wiring
B) the use of hand tools
C) personnel having to utilize a ladder
D) opening attachment plugs

Question 13

Wire connectors, pigtails, locknuts, bushings, raceway connectors, and grounding screws are not factors when calculating ____.

A) box fill
B) branches
C) total load
D) connections

Question 14

Supporting screws for nonmetallic boxes must be mounted ____ unless the box is constructed in a manner that prevents contact between the conductors in the box and the supporting screws.

A) with non-metallic sheaths
B) inside the box with bushings
C) outside of the box
D) with polymer braces

Question 15

A 3- x 2-in.(75- x 50-mm) device box, 2.5 in.(65 mm) deep, has a volume of ____.

A) 6.5 in.³ (107 cm³)
B) 9.5 in.³ (156 cm³)
C) 12.5 in.³ (205 cm³)
D) 24 in.³ (393 cm³)

Question 16

Where a box contains both straight and angle (or U) pulls, or straight pulls and splices, you should calculate each type of pull ____ to find the dimension.

A) and multiply by 6
B) and multiply by 2
C) individually
D) sequentially

Question 17

Cable connector(s) with a ____ outside the box are not counted when determining the number of conductors.

A) bonding jumper
B) connection
C) clamping mechanism
D) branch

Question 18

____ are permitted inside conduit bodies, if the manufacturer durably and legibly marked the cubic inch capacity on the conduit body.

A) Branches or taps
B) Cables, cable sheaths or metallic sheathing
C) Raceway openings
D) Splices, taps, or devices

Question 19

____ or fewer luminaire wires (smaller than 14 AWG) and an equipment grounding conductor can be omitted from box fill calculations if they enter a box from a domed luminaire (or similar canopy) and terminate within that box.

A) Two
B) Four
C) Six
D) Eight

Question 20

Multiconductor cord or cable used to support a box must be protected in an approved manner so that the conductors are not subjected to ____.

A) strain
B) transient current
C) tensile force
D) compression

Question 21

The length of a straight pull for multiple raceways must be at least ____ times the trade size (metric designator) of the largest single raceway.

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

Question 22

What is the angle pull for a raceway in the vertical dimension where the trade size of the largest raceway is 4 in.and the sum of the other raceways in the same row on the same wall is 5 in.?

A) 20 in.
B) 29 in.
C) 45 in.
D) 47 in.

Question 23

The minimum box width for U pulls must include ____.

A) 6 in.between raceways
B) the thickness of the two raceways
C) 12 in.between raceways plus the thickness of the two raceways
D) the average pull length plus the thickness of the two raceways

Question 24

Where multiple rows of raceways enter a box, you should calculate each row separately and use the ____.

A) single row that provides the maximum distance
B) average of the rows
C) median of the rows
D) single row that provides the minimal distance

Question 25

What is the angle pull for a raceway in the horizontal dimension where the trade size of the largest raceway is 3 in.and the sum of the other raceways in the same row on the same wall is 4 in.?

A) 20 in.
B) 22 in.
C) 29 in.
D) 47 in.