Deck 3: Boxes and Enclosures

Question 1

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

A) 10
B) 20
C) 25
D) 30

Answer 1

B

Question 2

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 back of the box

Answer 2

D

Question 3

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

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

Answer 3

B

Question 4

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

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

Question 5

____ 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 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

Supporting screws for nonmetallic boxes must be mounted ____.

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

Question 9

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 10

Box calculations for 4 AWG and larger conductors (under 600 volts) 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 11

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

A) 50
B) 75
C) 90
D) 100

Question 12

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 13

A luminaire that weighs more than ____ pounds shall be supported independently of the outlet box, unless the outlet box is listed and marked on the interior of the box to indicate the maximum weight the box shall be permitted to support.

A) 20
B) 30
C) 40
D) 50

Question 14

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 15

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 16

Equipment grounding conductor(s) or equipment bonding jumpers entering a box count as ____.

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

Question 17

A 3 x 2-in. device box, 2.5 in. deep, has a volume of ____ cubic inches.

A) 6.5
B) 9.5
C) 12.5
D) 24

Question 18

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

A) 2
B) 6
C) 8
D) 10

Question 19

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

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

Question 20

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 21

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 22

Where multiple rows of raceways enter a box, 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 23

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

A) 20 inches
B) 29 inches
C) 45 inches
D) 47 inches

Question 24

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

A) 20 inches
B) 22 inches
C) 29 inches
D) 47 inches

Question 25

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

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