Question 1

In a sub-panel, a green bonding screw provided by the panel manufacturer must be installed to electrically bond the grounded feeder conductor and the equipment-grounding conductors to the panel enclosure.

Accepted Answer

Only required in main panels.

Question 2

When holes are bored through wood framing members, they must be at least __________ inches from the nearest edge of the wood member.

Accepted Answer

According to International Residential Code (IRC), when holes are bored through wood framing members, they must be at least 1-1/4 inches from the nearest edge of the wood member.

Question 3

Residential electrical systems may be grounded using only the metal water pipe system and do not need a supplemental grounding electrode.

Accepted Answer

While a metal water pipe can be used as a grounding electrode, it is not considered a reliable enough source for grounding and a supplemental grounding electrode is required by the National Electrical Code. This can be a ground rod, concrete encased electrode, or other approved method.

Question 4

Which of the following is not a NEC requirement for minimum clearance of a lighting fixture from the storage space in clothes closets?

Accepted Answer

The NEC requires a minimum clearance of 12" for surface incandescent, LED, and fluorescent fixtures, as well as a minimum clearance of 6" for recessed incandescent, LED, and fluorescent fixtures. Therefore, the only option that is not a NEC requirement is C, which states a minimum clearance of 12" for surface fluorescent fixtures.

Question 5

Receptacle outlets in habitable rooms must be installed so that no point measured horizontally along the floor line in any wall space in more than __________ feet from a receptacle outlet.

Accepted Answer

According to the National Electrical Code (NEC), receptacle outlets in habitable rooms must be installed so that no point measured horizontally along the floor line in any wall space is more than 6 feet from a receptacle outlet. This ensures that there are enough outlets to provide power to electrical devices in a room without the need for long cords or dangerous extension cords.

Question 6

A(n) __________ is an unintended low-resistance path through which current flows around, rather than along, a circuit's intended current path.

Accepted Answer

A short circuit occurs when there is an unintended connection between two points in a circuit that have a low resistance, causing a large amount of current to flow outside of the intended path. This can cause damage to components and potentially start a fire. A grounded circuit involves intentionally connecting a circuit to the earth to protect against electrical shock. An open circuit occurs when there is a break in the circuit and no current can flow. A grounding circuit is similar to a grounded circuit but involves the intentional use of a grounding wire to divert excess current in the event of a fault.

Question 7

GFCI protection is not required for 125 volt, 15- or 20-ampere receptacles located __________.

Accepted Answer

GFCI (Ground Fault Circuit Interrupter) protection is required in areas where electrical outlets are in close proximity to water, such as bathrooms, garages, and outdoor locations, to prevent electrical shock. Finished basements are not specifically mentioned in the NEC (National Electrical Code) as requiring GFCI protection unless they have specific conditions that do.

Question 8

The rating of the __________ determines the rating of a branch or feeder circuit.

Accepted Answer

The fuse or circuit breaker is what determines the rating of a branch or feeder circuit. It is responsible for protecting the circuit from overloading or short-circuiting, and its rating should match the maximum current that the circuit can safely handle. The conductor, receptacle, and main panel are important components of an electrical system, but they do not determine the rating of a branch or feeder circuit.

Question 9

A continuity tester can be used to find short circuits, ground faults, and open circuits in de-energized circuits.

Accepted Answer

A continuity tester is designed to test for the continuity of an electrical circuit. It can detect if there is a break or interruption in the circuit, which can indicate an open circuit. It can also detect if there is a connection between two points that should not be connected, which can indicate a short circuit. Additionally, it can detect if a wire is touching a ground point unintentionally, which can indicate a ground fault. These tests can be performed on de-energized circuits to ensure safe working conditions.

Question 10

The minimum length of free conductor at all boxes must be at least __________ inches.

Accepted Answer

The National Electrical Code (NEC) requires a minimum of 6 inches of free conductor length at all boxes for making connections.

Question 11

Outdoor receptacles must be installed __________.

Accepted Answer

Outdoor receptacles must be installed no more than 6.5 feet above grade to ensure accessibility and compliance with electrical code requirements.

Question 12

According to the NEC, all work spaces must be provided with illumination.

Accepted Answer

The NEC requires all work spaces to be provided with adequate illumination to ensure safe and proper working conditions.

Question 13

At kitchen countertops, receptacle outlets must be installed so that no point along the wall line is more than __________ feet, measured horizontally, from a receptacle outlet in that space.

Accepted Answer

Receptacle outlets must be installed so that no point along the wall line is more than 2 feet, measured horizontally, from a receptacle outlet in that space.

Question 14

When there is a short in a branch circuit, a high circuit resistance develops that results in low amounts of current flowing on the circuit.

Accepted Answer

High amounts of current flowing is a result of a short circuit.

Question 15

The minimum size of service disconnect for a single-family dwelling unit permitted by the NEC is __________ amperes.

Accepted Answer

According to NEC 230.79, the minimum size of service disconnect for a single-family dwelling unit should be 100 amperes. Therefore, the correct choice is C.

Question 16

In residential applications, Type NM cable is permitted to pass through environmental air handling spaces perpendicular to the long dimension of the space.

Accepted Answer

According to NEC 300.22(C), Type NM cable is allowed to pass through environmental air handling spaces as long as it is perpendicular to the long dimension of the space and is not subject to mechanical damage.

Question 17

According to the NEC, lighting fixtures must be installed in clothes closets.

Accepted Answer

The NEC (National Electrical Code) specifies that lighting fixtures in clothes closets must adhere to strict guidelines due to fire safety concerns, but it does not mandate that lighting fixtures must be installed in all clothes closets.

Question 18

All branch circuits supplying 125-volt, 15- and 20-ampere outlets and devices in residential kitchens, family rooms, living rooms, dining rooms, parlors, libraries, dens, bedrooms, sunrooms, recreation rooms, closets, hallways, laundry areas, or similar rooms must be protected by a(n) __________

Accepted Answer

These areas require protection by an Arc Fault Circuit Interrupter (AFCI) device to prevent fires caused by electrical arcs.

Question 19

A(n) __________ is a circuit that is energized but does not allow useful current to flow on the circuit because of a break in the current path.

Accepted Answer

An open circuit is a circuit that is not complete because there is a break in the current path, which prevents useful current from flowing. A grounded circuit occurs when a live wire comes into contact with a grounded conductor or surface, creating a low-resistance path that allows excess current to flow to ground. A short circuit occurs when a live wire comes into contact with a neutral or ground wire, creating a low-resistance path that allows excessive current to flow. A ground fault occurs when a live wire comes into contact with a ground wire or conductive surface, creating a low-resistance path that allows excessive current to flow to ground.

Question 20

At least __________ 20-ampere small appliance branch circuits are (is) required to serve kitchen countertop surfaces.

Accepted Answer

The National Electrical Code (NEC) requires at least two 20-ampere small appliance branch circuits for kitchen countertop surfaces. This is to ensure that there is enough power to provide for multiple small appliances that may be used simultaneously, such as blenders, toasters, and coffee makers. The circuits must be dedicated solely to serving the kitchen countertop surfaces and must not supply any other areas or devices.

Quiz 20: Checking Out and Troubleshooting Electrical Wiring Systems