Practice Quiz 1 - Nec Exam

1. The minimum height of working spaces about electrical equipment, switchboards, panelboards, or motor control centers operating at 600V, nominal, or less and likely to require examination, adjustment, servicing, or maintenance while energized shall be 6 1/2 ft or the height of the equipment, whichever is greater, except for service equipment or panelboards in existing dwelling units that do not exceed 200A.

True

False

The statement is true because according to the given information, the minimum height of working spaces for electrical equipment is 6 1/2 ft or the height of the equipment, whichever is greater. This requirement applies to equipment operating at 600V or less and is likely to require examination, adjustment, servicing, or maintenance while energized. However, there is an exception for service equipment or panelboards in existing dwelling units that do not exceed 200A.

Explanation

The statement is true because according to the given information, the minimum height of working spaces for electrical equipment is 6 1/2 ft or the height of the equipment, whichever is greater. This requirement applies to equipment operating at 600V or less and is likely to require examination, adjustment, servicing, or maintenance while energized. However, there is an exception for service equipment or panelboards in existing dwelling units that do not exceed 200A.

2. "Bonded" can be described as _____ to establish electrical continuity and conductivity.

Isolated

Guarded

Connected

Separated

Definition 100

Explanation

Definition 100

3. The NEC is_______.

Intended to be a design manual

Meant to be used as an instruction guide for untrained persons

For the practical safeguarding of persons and property

Published by the Bureau of Standards

Section 90.1 A

Explanation

Section 90.1 A

4. In other than dwelling locations, GFCI protection is required in _____ .

Indoor wet locations

Locker rooms adjacent to showering facilities

Garages, service bays, and similar areas

All of these

section 210.8(B)(6),(7), and (8)

Explanation

section 210.8(B)(6),(7), and (8)

5. If the NEC requires new products that are not yet available at the time a new edition is adopted, the ______ may permit the use of the products that comply with the previous edition of the Code adopted by that jurisdiction.

Electrical engineer

Master electrician

Authority having jurisdiction

Permit holder

Section 90.4

Explanation

Section 90.4

6. A circuit breaker is a device designed to _____ the circuit automatically on a predetermine overcurrent without damage to itself when properly applied within its rating.

Energize

Reset

Connect

Open

Definition 100

Explanation

Definition 100

7. If used for single-pole, 3-way or 4-way switch loops, the reidentified conductor with white or gray insulation or three continuous white stripes can be used for the supply to the switch, but not as a return conductor from the switch to the outlet.

True

False

Section 200.7(C)(1)

Explanation

Section 200.7(C)(1)

8. If neutral conductors of different voltage systems are installed in the same raceway, cable, or enclosure, the means of idenification of the different neutrals shall be documented in a manner that's _____ or be permanently posted where the conductors or fiffernet systems originate.

Available to the AHJ

Available through the engineer

Readily available

Included in the as-built drawings

Section 200.6 D (3)Ex

Explanation

Section 200.6 D (3)Ex

9. A minimum working space depth of _____ to live parts operating at 277 volts-to-ground is required where there are exposed live parts on one side and no live or grounded parts on the other side.

2 ft

3 ft

4 ft

6 ft

110.26 (A)(1) and Table 110.26 (A)(1) Condition 1

Explanation

110.26 (A)(1) and Table 110.26 (A)(1) Condition 1

10. For equipment rated 1,200A or more that contains overcurrent devices, switching devices, or control devices; and where the entrance to the working space has a personnel door less than 25 ft from the working space, the door shall _____ .

Open either in or out with simple pressure and shall not have any lock

Be equipped with a locking means

Be equipped with an electronic opener

Section 110.26(C)(3)

Explanation

Section 110.26(C)(3)

11. Concrete, brick, or tile walls are considered _____, as applied to working space requirements.

Inconsequential

In the way

Grounded

None of these

Section 110.26(A)(1) Table 110.26(A)(1) Condition 2

Explanation

Section 110.26(A)(1) Table 110.26(A)(1) Condition 2

12. Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect all _____ conductors at the point where the branch circuit originates.

Circuit

Grounded

Grounding

Ungrounded

section 210.4(B)

Explanation

section 210.4(B)

13. When normally enclosed live parts are exposed for inspection or servicing, the working space, if in a passageway or general open space, shall be suitably_____ .

Accessible

Guarded

Open

Enclosed

Section 110.26(B)

Explanation

Section 110.26(B)

14. Multiwire branch circuits shall

Supply only line-to-neutral loads

Not be permitted in dwelling units

Have their conductors originate from different panelboards

None of these

Section 210.4(C)

Explanation

Section 210.4(C)

15. The NEC defines a "_____" as all circuit conductors between the service equipment, the source of a separately derived system, or other power-supply source and the final branch-circuit overcurrent device.

Service

Feeder

Branch circuit

All of these

Definitions 100

Explanation

Definitions 100

16. Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so _______.

That it can be locked out and tagged

It is not readily accessible

The purpose is evident

That it operates at less than 300 volts-to-ground

Each disconnecting means must be clearly labeled to indicate its purpose, unless it is located and arranged in a way that makes the purpose obvious. This means that if the disconnecting means is easily identifiable without any additional labeling, it does not need to be marked.

Explanation

Each disconnecting means must be clearly labeled to indicate its purpose, unless it is located and arranged in a way that makes the purpose obvious. This means that if the disconnecting means is easily identifiable without any additional labeling, it does not need to be marked.

17. The connection between the grounded conductor and the equipment grounding conductor at the service is accomplished by installing a(n) _____ bonding jumber.

Main

System

Equipment

Circuit

Definitions 100

Explanation

Definitions 100

18. The rating of a branch circuit shall be determined by the rating of the _____ .

Ampacity of the largest device connected to the circuit

Average of the ampacity of all devices

Branch-circuit overcurent device

Ampacity of the branch-circuit conductors according to Table 310.15(B)(16)

Section 210.3

Explanation

Section 210.3

19. If dwelling units, the voltage between conductors that supply the terminals of _____ shall not exceed 120V, nominal.

Luminairs

Cord-and-plug-connected loads of 1,440 VA or less

Cord-and-plug-connected loads of more than 1/4 hp

A and b

Section 210.6 (A)(1) and (2)

Explanation

Section 210.6 (A)(1) and (2)

20. The required working space for access to live parts operating at 300 volts-to-ground, where there are exposed live parts on both sides of the workspace is _____ .

3 ft

3 1/2 ft

4 ft

4 1/2 ft

The required working space for access to live parts operating at 300 volts-to-ground, where there are exposed live parts on both sides of the workspace, is 4 ft. This distance is necessary to ensure the safety of workers and prevent accidental contact with live parts. It allows for enough space to maneuver and work safely without the risk of electrical shock or injury.

Explanation

The required working space for access to live parts operating at 300 volts-to-ground, where there are exposed live parts on both sides of the workspace, is 4 ft. This distance is necessary to ensure the safety of workers and prevent accidental contact with live parts. It allows for enough space to maneuver and work safely without the risk of electrical shock or injury.

21. Grounded conductors _____ and larger can be identified by distinctive white and gray markings at their terminations.

10 AWG

8 AWG

6 AWG

4 AWG

Section 200.6(B)(4)

Explanation

Section 200.6(B)(4)

22. The NEC requires that electrical work be _______ .

Installed in a neat and workmanlike manner

Installed under the supervision of a licensed person

Completed before being inspected

All of these

Section 110.12

Explanation

Section 110.12

23. Receptacles shall have the terminal intended for connection to the grounded conductor identified by a metal or metal coating that is substantially _____ in color.

Green

White

Gray

B or c

Section 200.10 B1

Explanation

Section 200.10 B1