Question 1

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

Accepted Answer

The NEC (National Electrical Code) requires that all work spaces be provided with illumination in order to ensure safety and productivity. This requirement is outlined in Section 410.16(A), which specifies the minimum illumination levels required for different types of work spaces.

Question 2

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 perpendicular to the long dimension of the space in residential applications, provided that it is at least 1.5 meters (5 feet) above the floor and is protected by a 1-hour fire-resistant rated enclosure.

Question 3

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 4

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 5

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 due to a break in the current path, preventing useful current from flowing. A grounded circuit occurs when an unintended connection to ground is present, which can result in a shock hazard. A short circuit occurs when a low-resistance path is created between two points in a circuit, causing excessive current flow and potentially damaging equipment. A ground fault occurs when the current flows from a circuit into the ground due to an unintentional current path.

Question 6

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

Accepted Answer

GFCI protection is required for 125 volt, 15- or 20 amp receptacles located in bathrooms and outdoors, but not required in finished basements and garages.

Question 7

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

Accepted Answer

According to NEC 230.79, the minimum size of service for a single-family dwelling unit is 100 amperes.

Question 8

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 NEC (National Electric Code) section 210.52 (a), 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.

Question 9

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 10

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, a residential electrical system must have a supplemental grounding electrode in addition to the metal water pipe system. This ensures a reliable and safe pathway for excess electrical current to flow to the earth in the event of a fault or surge. The supplemental grounding electrode can be a grounding rod or plate, or any other approved grounding electrode.

Question 11

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 is a situation where the current flows through a path with low resistance (usually due to a fault or defect in the circuit) instead of following the intended current path. This can cause damage to components or even start a fire. A grounded circuit is a circuit that has a direct connection to the ground, used for safety reasons. An open circuit is when there is a break in the intended current path, causing a lack of continuity and preventing the flow of current. A grounding circuit is a specific type of circuit used to provide a safe path to ground for electrical equipment.

Question 12

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 13

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

Accepted Answer

The National Electrical Code (NEC) requires at least two 20-amp small appliance branch circuits to serve kitchen countertop surfaces to ensure adequate power supply for kitchen appliances.

Question 14

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 15

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

Accepted Answer

The fuse or circuit breaker is the protective device that determines the rating of a branch or feeder circuit. It is designed to trip or blow if the current exceeds its rated value, which helps to prevent overheating and fire hazards. Conductors, receptacles, and main panels are all important components of an electrical system, but they do not directly determine the rating of a circuit.

Question 16

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 be used to test for continuity in a circuit, which can help identify short circuits, ground faults, and open circuits in de-energized circuits.

Question 17

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, the circuit resistance becomes very low, resulting in a large amount of current flowing on the circuit.

Question 18

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 19

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 20

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

Accepted Answer

The answer of The minimum length of free conductor at...

Quiz 20: Checking Out and Troubleshooting Electrical Wiring Systems