4A Midterm

A hybrid system is comprised of multiple power sources, such as _____, but not the utility power system.

photovoltaic wind micro-hydro generators

Some cleaning and lubricating compounds can cause severe deterioration of many plastic materials used for insulating and structural applications in equipment.

true

A series circuit has a total resistance of 180 Ω and an applied voltage of 120 V. What is the current flow?

1.5 A

A minimum working space depth of _____ ft to live parts of equipment 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.

3ft

A series circuit has a total resistance of 240 Ω and a current flow of 4 A. What is the applied voltage?

60 V

A two-resistor series circuit has an applied voltage of 100 V. The voltage across one of the resistors is 40 V. What is the voltage across the other resistor?

60 V

In the NEC, the word(s) "_____" indicate a mandatory requirement.

Shall or shall not

Compliance with the provisions of the NEC will result in _____.

an electrical system essentially free from hazard

Conductor sizes are expressed in American Wire Gage (AWG) or in _____.

circular mils

A device that provides a means to connect intersystem bonding conductors for _____ systems to the grounding electrode system is an "intersystem bonding termination."

communications

Wires are considered _____ if rendered inaccessible by the structure or finish of the building.

concealed

Conductor terminal and splicing devices shall be _____ for the conductor material and they shall be properly installed and used.

identified

Factory-installed _____ wiring of listed equipment need not be inspected at the time of installation of the equipment, except to detect alterations or damage.

internal

An outlet intended for the direct connection of a lampholder or a luminaire is a(an) "_____."

lighting outlet

A building that contains three or more dwelling units is called a "_____."

multifamily dwelling

An "optical fiber cable" is a factory assembly or field assembly of one or more optical fibers having a(an) _____ covering.

overall

Explanatory material, such as references to other standards, references to related sections of the NEC, or information related to a Code rule, are included in the form of Informational Notes.

true

The NEC does not cover electrical installations in ships, watercraft, railway rolling stock, aircraft, or automotive vehicles.

true

A duplex receptacle is an example of a multiple receptacle that has two receptacles on the same _____.

yoke or strap

All switchboards, switchgear, panelboards, and motor control centers shall be located in dedicated spaces and protected from damage and, for outdoor installations, the space equal to the width and depth of the equipment and extending from grade to a height of _____ ft above the equipment, shall be dedicated to the electrical installation.

6ft

What is the applied voltage in a series circuit with two resistors (25 V and 60 V, respectively)?

85 V

A device that, by insertion into a locking support and mounting receptacle, establishes a connection between the conductors of the attached utilization equipment and the branch-circuit conductors connected to the locking support and mounting receptacle is otherwise known as a(an) "_____."

attachment fitting

When a circuit has only one path, the _____ is the same at any point.

current

The Code contains provisions considered necessary for safety, which will not necessarily result in _____.

efficient use convenience good service or future expansion of electrical use

Working space is required for equipment operating at 1,000V, nominal, or less to ground and likely to require _____ while energized.

examination adjustment servicing or maintenance

Examples of approved means of achieving terminal connection torque values include torque tools or an experienced qualified person that can demonstrate that the proper torque has been applied.

false

It is the intent of the NEC that factory-installed _____ wiring of listed equipment need not be inspected at the time of installation of the equipment, except to detect alterations or damage.

internal

Any current in excess of the rated current of equipment or the ampacity of a conductor is called "_____."

overcurrent

Internal parts of electrical equipment, including busbars, wiring terminals, insulators, and other surfaces, shall not be damaged or contaminated by foreign materials such as _____, or corrosive residues.

paint and plaster cleaners abrasives

A(An) "_____ system" is an electrical source, other than a service, having no direct connection(s) to circuit conductors of any other electrical source other than those established by grounding and bonding connections.

separately derived

The Code does not cover installations under the exclusive control of an electrical utility such as _____.

service drops and laterls

_____ at other than dwelling units shall be legibly field marked with the available fault current, include the date the fault-current calculation was performed, and be of sufficient durability to withstand the environment involved.

service equipment

Chapters 5, 6, and 7 of the NEC apply to _____.

special occupancies special equipment special conditions

Communications wiring such as telephone, antenna, and CATV wiring within a building shall not be required to comply with the installation requirements of Chapters 1 through 7, except where specifically referenced in Chapter 8.

true

The minimum height of working spaces about electrical equipment, switchboards, panelboards, or motor control centers operating at 1,000V, 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