Question 1

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.

Accepted Answer

Each type of pull should be calculated individually as they may have different dimensions. Multiplying by a specific number (i.e. 6 or 2) would only work if every pull had the same dimension, which is not guaranteed in this scenario.

Question 2

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

Accepted Answer

D

Question 3

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

Accepted Answer

C

Question 4

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

Accepted Answer

Equipment grounding conductor(s) or equipment bonding jumpers entering a box count as one conductor for the purpose of calculating box fill.

Question 5

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.

Accepted Answer

Snap switches, including dimmer switches, must be connected to an equipment grounding conductor to ensure that any electrical faults are carried safely to ground. Additionally, even if a metal faceplate is not installed, the switch must be able to connect to the equipment grounding conductor to prevent any potential electrical hazards. A bonding jumper or a switch mounting strap may provide this connection, but the equipment grounding conductor is the most important and necessary connection. Non-metallic yokes are used in switches to insulate them from the electrical circuit and do not provide a means of grounding.

Question 6

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

Accepted Answer

The inspection should be possible without having to disconnect any part of the wiring to avoid any potential hazards or damage that may occur.

Question 7

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

Accepted Answer

Multiconductor cords or cables used to support a box must be protected to prevent strain on the conductors. Strain can cause the conductors to break or become disconnected, leading to electrical hazards. Therefore, it is important to protect the cords and cables from strain using an approved method.

Question 8

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

Accepted Answer

Wire connectors, pigtails, locknuts, bushings, raceway connectors, grounding screws, and equipment bonding jumpers do not affect the number or size of conductors and devices that can be installed in a box, which is what box fill calculations determine. They can, however, be factors in other calculations, such as total load or connection requirements.

Question 9

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

Accepted Answer

The answer of Volume shall be marked on all nonmetallic...

Question 10

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

Accepted Answer

The answer of The weight supported by any single conduit...

Question 11

Conduit body support must be ____.

Accepted Answer

Conduit body support must be rigid and secure to ensure the conduit system and wiring remain stable and safe. Grounding, non-metallic materials, and connection to a raceway are not related to the support of a conduit body.

Question 12

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.

Accepted Answer

The answer of A luminaire that weighs more than ____...

Question 13

Supporting screws for nonmetallic boxes must be mounted ____.

Accepted Answer

Supporting screws for nonmetallic boxes must be mounted outside of the box to ensure proper installation and support.

Question 14

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

Accepted Answer

The answer of Nonmetallic-sheathed cable not fastened to the box...

Question 15

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

Accepted Answer

The maximum number of conductors allowed in a box applies only if the box does not contain any fittings or devices, as these would reduce the space available for conductors.

Question 16

____ 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.

Accepted Answer

The answer of ____ or fewer luminaire wires (smaller than...

Question 17

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

Accepted Answer

Splices, taps, or devices are permitted inside conduit bodies if the manufacturer has durably and legibly marked the cubic inch capacity on the conduit body. This allows for proper calculation of fill and ensures compliance with the National Electrical Code (NEC) requirements for conduit fill and box fill calculations.

Question 18

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

Accepted Answer

The formula to find the volume of a rectangular prism is V = l x w x h, where l is the length, w is the width, and h is the height. 
In this case, the length is 3 inches, the width is 2 inches, and the height is 2.5 inches. 
So, V = 3 x 2 x 2.5 = 15 cubic inches. 
Therefore, the answer is choice C, 12.5.

Question 19

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

Accepted Answer

Plaster (mud) rings are used to increase the volume in boxes, allowing for additional space for wiring or devices. These rings are added to the existing setup to extend the box without needing to replace it.

Question 20

Box calculations for 4 AWG and larger conductors (under 600 volts) are performed based on the ____.

Accepted Answer

Box calculations for 4 AWG and larger conductors (under 600 volts) are based on the size and number of raceways. This is because the raceways that contain the conductors determine the amount of space needed in the box. The volume of the box and branch circuit load are not the primary factors considered in these calculations. The number of rings and the volume of the box are also not factors in determining box size for these conductors.

Quiz 3: Boxes and Enclosures