Question 1

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 or has a break in the current path, so no current can flow and the circuit remains inactive.

Question 2

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 3

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

Accepted Answer

Type NM cable is permitted to pass through environmental air handling spaces perpendicular to the long dimension of the space if it is secured and protected from damage. However, it is not permitted to be installed in ducts used for environmental air.

Question 4

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, 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 6 feet from a receptacle outlet.

Question 5

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 a low-resistance path is created between two points in a circuit, causing current to flow through the unintended path instead of the intended circuit path. This can result in damage to the circuit or electrical components, as well as potential safety hazards such as fire or electric shock. Grounded circuits and grounding circuits involve intentionally connecting a circuit to ground for safety or functionality purposes, while an open circuit refers to a break in the circuit path that prevents current from flowing at all.

Question 6

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

The answer of At kitchen countertops, receptacle outlets must be...

Question 7

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 8

Outdoor receptacles must be installed __________.

Accepted Answer

The answer of Outdoor receptacles must be installed __________.
...

Question 9

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

Accepted Answer

According to the National Electrical Code (NEC), residential electrical systems must have a supplemental grounding electrode in addition to using the metal water pipe system. This is to ensure that there is a reliable path for current to flow to the earth in the event of a fault or lightning strike. The supplemental grounding electrode can be a grounding rod or plate, or a concrete-encased electrode.

Question 10

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

Accepted Answer

According to NEC 314.17(C), the minimum length of free conductor at all boxes must be at least 6 inches.

Question 11

At least __________ 20 amp small appliance branch circuits are required to serve kitchen countertop surfaces.

Accepted Answer

The answer of At least __________ 20 amp small appliance...

Question 12

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 13

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

Accepted Answer

According to NEC 210.70(A)(1), all work spaces must be provided with illumination.

Question 14

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

Accepted Answer

GFCI protection is required for all 125 volt, 15- or 20 amp receptacles located in bathrooms, outdoors, and in garages, with the exception of those located in a finished basement, which do not require GFCI protection.

Question 15

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

Accepted Answer

The branch circuits in these rooms must be protected by AFCI devices (Arc-Fault Circuit Interrupters) according to the National Electrical Code (NEC). AFCI devices are designed to detect and interrupt arcing faults, which can be a common source of electrical fires. Fuses and circuit breakers can provide overcurrent protection but do not provide arc-fault protection. GFCI devices (Ground-Fault Circuit Interrupters) are required for circuits in bathrooms, kitchens, and outdoor areas but are not required in the rooms listed in the question.

Question 16

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

Accepted Answer

When there is a short in a branch circuit, it results in a low circuit resistance, causing an excessive flow of current on the circuit.

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

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

Accepted Answer

A continuity tester can determine whether there is a complete path for electricity to flow in a circuit, which can help identify short circuits, ground faults, and open circuits.

Question 19

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

Accepted Answer

According to the NEC, the minimum size of service for a single-family dwelling is 100 amperes.

Question 20

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

Accepted Answer

The fuse or circuit breaker is responsible for protecting the branch or feeder circuit from overloading and short circuits. The rating of the fuse or circuit breaker determines the maximum amount of current allowed to flow through the circuit, and this rating must match the rating of the conductor in order to ensure proper protection. The receptacle and main panel do not determine the rating of the branch or feeder circuit.

Quiz 20: Checking Out and Troubleshooting Electrical Wiring Systems