Practice Quiz 1
Connection by means of wire-binding screws, studs, or nuts having upturned lugs or the equivalent shall be permitted for _____or smaller conductors.
1 0 AWG 110.14(A)
Capable of being removed or exposed without damaging the building structure or finish, or not permanently closed in by the structure or finish of the building is known as
100 accessible (as applied to wiring methods)
A minimum working space depth of _ to live parts aperating 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.
3 ft 110.26(A)(1)and Table 1 0.26(A)(1 ) , Condition 1
The term "rainproof" is typically used in conjunction with Enclosure-Type Number _ .
3R, 3RX, Table 110.28 Note 1
Grounded conductors _ and larger can be identified by distinctive white or gray markings at their terminations.
4 AWG, 200.6(B)(4)
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 110.26(A)(1)and Table 1 0.26(A)(1 ) , Condition 3
Within sight means visible and not more than from the equipment.
50 100 In Sight from (Within Sight)
A Class A GFCI protection device is designed to trip when the ground-fault current to ground is __ or higher
6 mA 100 Note, Ground-Fault Circuit Interrupter
For circuits rated 1 ODA or less, when the equipment terminals are listed for use with 75°C conductors, the _ column of Table 31 0.1 5(8)(16) shall be used to determine the ampacity of THHN conductors.
75°C 110.14(C)(1)(a)(4)
The Code contains provisions considered necessary for safety, which will not necessarily result in
90.1 (B) Adequacy. This Code contains provisions that are considered necessary for safety. Compliance therewith and proper maintenance results in an installation that is essentially free from hazard but not necessarily efficient, convenient, or adequate for good service or future expansion of electrical use.
The NEC is
90.1(A) for the practical safeguarding of persons and property
The Code isn't a design specification standard or instruction manual for the untrained and unqualified
90.1(C) Intention. This Code is not intended as a design specification or an instruction manual for untrained persons.
The NEC applies to the installation of
90.2(A) Covered. This Code covers the installation of electrical conductors, equipment, and raceways; signaling and communications conductors, equipment, and raceways; and optical fiber cables and raceways for the following: (1) Public and private premises, including buildings, structures, mobile homes, recreational vehicles, and floating buildings (2) Yards, lots, parking lots, carnivals, and industrial substations (3) Installations of conductors and equipment that connect to the supply of electricity (4) Installations used by the electric utility, such as office buildings, warehouses, garages, machine shops, and recreational buildings, that are not an integral part of a generating plant, substation, or control center.
Installations of communications equipment that are under the exclusive control of communications utilities, and located outdoors or in building spaces used exclusively for such installations __ covered by the NEC.
90.2(B)(4) Installations of communications equipment under the exclusive control of communications utilities located outdoors or in building spaces used exclusively for such installations
Utilities may be subject to compliance with codes and standards covering their regulated activities as adopted under governmental law or regulation
90.2(B)(5) note Informational Note to (4) and (5): Examples of utilities may include those entities that are typically designated or recognized by governmental law or regulation by public service/utility commissions and that install, operate, and maintain electric supply (such as generation, transmission, or distribution systems) or communications systems (such as telephone, CATV, Internet, satellite, or data services). Utilities may be subject to compliance with codes and standards covering their regulated activities as adopted under governmental law or regulation. Additional information can be found through consultation with the appropriate governmental bodies, such as state regulatory commissions, the Federal Energy Regulatory Commission, and the Federal Communications Commission.
The NEC does not apply to electric utility-owned wiring and equipment __ .
90.2(B)(5)a Consist of service drops or service laterals, and associated metering, or
___________.are designed for surface mounting with a swinging door
Cutout boxes 100 Cutout Box
An overload is the same as a short circuit or ground fault.
False 100 Oberload
The dedicated space above a panelboard extends to a dropped or suspended ceiling, which is considered a structural ceiling.
False 110.26(E)(1)(d)
__ is a term indicating that there is an intentional delay in the tripping action of the circuit breaker, which decreases as the magnitude of the current increases.
Inverse time 100 Circuit Breaker, Inverse Time
Where no statutory requirement exists, the authority having jurisdiction can be a property owner or his/her agent, such as an architect or engineer.
True 100 Note, Authority Having Jurisdiction
A raceway is an enclosure designed for the installation of wires, cables, or busbars.
True 100 Raceway
A raintight enclosure is constructed or protected so that exposure to a beating rain will not result in the entrance of water under specified test conditions.
True 100 Raintight
Service conductors originate at the service point and terminate at the service disconnecting means.
True 100 Service Conductors
A signaling circuit is any electrical circuit that energizes signaling equipment.
True 100 Signaling Circuit
Field markings of maximum available fault current at a service are not required for industrial installations where conditions of maintenance and supervision ensure that only qualified persons service the equipment.
True 110.24(B)Ex
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 6Y2 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 110.26(A)(3) and 110.26(A)(3) Ex 1
Equipment intended to interrupt current at fault levels shall have an interrupting rating not less than the nominal circuit voltage and the current that is available at the line terminals of the equipment.
True 110.9
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 90.3 Code Arrangement. This Code is divided into the introduction and nine chapters, as shown in Figure 90.3. Chapters 1, 2, 3, and 4 apply generally; Chapters 5, 6, and 7 apply to special occupancies, special equipment, or other special conditions. These latter chapters supplement or modify the general rules. Chapters 1 through 4 apply except as amended by Chapters 5, 6, and 7 for the particular conditions. Chapter 8 covers communications systems and is not subject to the requirements of Chapters 1 through 7 except where the requirements are specifically referenced in Chapter 8.
By special permission, the authority having jurisdiction may waive specific requirements in this Code where it is assured that equivalent objectives can be achieved by establishing and maintaining effective safety.
True 90.4 100 special permission Enforcement. This Code is intended to be suitable for mandatory application by governmental bodies that exercise legal jurisdiction over electrical installations, including signaling and communications systems, and for use by insurance inspectors. The authority having jurisdiction for enforcement of the Code has the responsibility for making interpretations of the rules, for deciding on the approval of equipment and materials, and for granting the special permission contemplated in a number of the rules. By special permission, the authority having jurisdiction may waive specific requirements in this Code or permit alternative methods where it is assured that equivalent objectives can be achieved by establishing and maintaining effective safety. This Code may require new products, constructions, or materials that may not yet be available at the time the Code is adopted. In such event, the authority having jurisdiction may permit the use of the products, constructions, or materials that comply with the most recent previous edition of this Code adopted by the jurisdiction
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, 200.7(C)(1)
All 1 5A and 20A, 1 25V receptacles installed in crawl spaces at or below grade level of dwelling units shall have GFCI protection.
True, 210.8(A)(4)
In industrial laboratories, 1 5A and 20A, 1 25V receptacles used to supply equipment where removal of power would introduce a greater hazard aren't required to be GFCI protected
True, 210.8(B)(5) Ex 1
A surge protective device (SPD) intended for installation on the load side of the service disconnect overcurrent device, including SPDs located at the branch panel, is a __ SPD.
Type 2 100 Surge Protective Devices (SPDs)
An accessory, such as a locknut, intended to perform a mechanical function best describes______.
a fitting 100 Fitting
Separately installed pressure connectors shall be used with conductors at the _ not exceeding the ampacity at the listed and identified temperature rating of the connector.
ampacities 110.14(C)(2)
The maximum current in amperes a conductor can carry continuously, where the temperature will not be raised in excess of the conductor's insulation temperature rating is called its
an electrical system essentially free from hazard 100 ampacity
A(n) __ branch circuit supplies energy to one or more outlets to which appliances are to be connected.
appliance 100 Branch Circuit, Appliance
An arc-fault circuit interrupter is a device intended to de-energize the circuit when it recognizes characteristics unique to _____.
arcing 100 Arc-Fault Circuit Interrupter (AFCI)
Nonmandatory Informative Annexes contained in the back of the Code book
are for information only and aren't enforceable as a requirement of the Code 90.5 (D) Informative Annexes. Nonmandatory information relative to the use of the NEC is provided in informative annexes. Informative annexes are not part of the enforceable requirements of the NEC, but are included for information purposes only.
Where two or more branch circuits supply devices or equipment on the same yoke, a means to disconnect simultaneously all ungrounded conductors that supply those devices or equipment shall be provided _
at the point where the branch circuit originates, 210.7
Special permission is the written consent from the __ .
authority having jurisdiction 100 Special Permission
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.
authority having jurisdiction 90.4 Enforcement. This Code is intended to be suitable for mandatory application by governmental bodies that exercise legal jurisdiction over electrical installations, including signaling and communications systems, and for use by insurance inspectors. The authority having jurisdiction for enforcement of the Code has the responsibility for making interpretations of the rules, for deciding on the approval of equipment and materials, and for granting the special permission contemplated in a number of the rules. By special permission, the authority having jurisdiction may waive specific requirements in this Code or permit alternative methods where it is assured that equivalent objectives can be achieved by establishing and maintaining effective safety. This Code may require new products, constructions, or materials that may not yet be available at the time the Code is adopted. In such event, the authority having jurisdiction may permit the use of the products, constructions, or materials that comply with the most recent previous edition of this Code adopted by the jurisdiction
A reliable conductor that ensures electrical conductivity between metal parts of the electrical installation that are required to be electrically connected is called a" __ . "
bonding conductor or jumper 100 Bonding Conductor or Jumper
A device that provides a means to connect bonding conductors for __ systems to the building grounding electrode system is an intersystem bonding termination.
communications 100 Intersystem Bonding Termination
A conductor encased within material of composition or thickness that is not recognized by the NEC as electrical insulation is considered ______.
covered 100 Conductor, Covered
A __ location will be protected from weather and not subject to saturation with water or other liquids; such locations include partially protected locations under canopies, marquees, and roofed open porches.
damp 100 Location Damp
A unit of an electrical system that carries or controls electric energy as its principal function is a(n) " __ ."
device 100 Devise
An enclosure or piece of equipment constructed so that dust will not enter the enclosure under specified test conditions is known as " ______"
dusttight 100 Dusttight
Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts is called "_________"
enclosed 100 Enclosed
The installed conductive path(s) that connects normally noncurrent-carrying metal parts of equipment together and to the system grounded conductor or to the grounding electrode conductor, or both, is known as a(n) __ .
equipment grounding conductor 100 Grounding Conductor, Equipment (EGC)
A solderless pressure connector is a device that______ between conductors or between conductors and a terminal by means of mechanical pressure.
establishes a connection 100 Connector, Pressure (Solderless)
Electrical equipment such as switchboards, panelboards, industrial control panels, meter socket enclosures, and motor control centers that are in other than dwelling units, and are likely to require _ while energized shall be field-marked to warn qualified persons of potential electric arc flash hazards.
examination, adjustment, servicing or maintenance 110.16
Equipment enclosed in a case that is capable of withstanding an explosion of a specified gas or vapor that may occur within it, and of preventing the ignition of a specified gas or vapor surrounding the enclosure by sparks, flashes, or explosion of the gas or vapor within, and that operates at such an external temperature that a surrounding flammable atmosphere will not be ignited thereby defines the phrase " __ . "
explosionproof equipment 100 Explosionproof Equipment
For wiring methods, "on or attached to the surface, or behind access panels designed to allow access" is known as ______.
exposed 100 Exposed (as applied to wiring methods)
The voltage of a circuit is defined by the Code as the __ root-mean-square (effective) difference of potential between any two conductors of the circuit concerned.
greatest 100 Voltage (of a circuit)
Connected to ground or to a conductive body that extends the ground connection is called " __ . "
grounded 100 Grounded
Concrete, brick, or tile walls are considered _ , as applied to working space requirements.
grounded 110.26(A)(1)and Table 1 0.26(A)(1 ) , Condition 2
All 1 5A and 20A, 1 25V receptacles installed in garages, service bays, and similar areas where _ are to be used must be GFCI protected.
grounded, ungrounded, grounding, 210.8(B)(8)
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 _ .
guarded 110.26(B)
A" __ " is an accommodation with two or more contiguous rooms comprising a compartment that provides living, sleeping, sanitary, and storage facilities.
guest suite 100 Guest Suite
GFCI protection shall be provided for all 1 5A and 20A, 1 25V receptacles in dwelling unit accessory buildings that have a floor located at or below grade level not intended as ___ and limited to storage areas, work areas, or similar use.
habitable rooms, 210.8(A)(2)
A hoistway is any __ in which an elevator or dumbwaiter is designed to operate.
hatchway or well hole, vertical opening or space, shaftway 100 Hoistway
Outline lighting may include an arrangement of __ to outline or call attention to the shape of a building.
incandescent lamps, electric-discharge lighting, electrically powered light sources 100 Outline Lighting
Underground service conductors are the underground conductors between the service point and the first point of connection to the service-entrance conductors in a terminal box, meter, or other enclosure, __ the building wall.
inside, outside 100 Service Conductors, Underground
The NEC requires that electrical work be _ .
installed in a neat and workmanlike manner 110.12
An isolating switch is one that is __ .
intended for isolating an electrical circuit from the source of power 100 Switch, Isolating
An outlet intended for the direct connection of a lampholder or a luminaire is a(n) " __ ."
lighting outlet 100 Lighting Outlet
Conductor terminal and splicing devices must be _ for the conductor material and they must be properly installed and used.
listed, approved, identified 1'10.14
To guard live parts over 50V but less than 600V, equipment is permitted to be _ .
located in a room accessible only to qualified persons ,located on a balcony accessible only to qualified persons, elevated 8 ft or more above the floor or other working surface 110.27(A)(1),(2), and(4)
Unless identified for use in the operating environment, no conductors or equipment shall be _ having a deteriorating effect on the conductors or equipment.
located in damp or wet locations, exposed to fumes, vapors, liquids or gases, exposed to excessive temperatures 110.1 ì
All switchboards, panelboards, and motor control centers shall be ____
located in dedicated spaces protected from damage 110.26(E)
Wooden plugs driven into holes in _ or similar materials shall not be used for securing electrical equipment.
masonry, concrete, plaster 110, 13(A)
In judging equipment for approval, considerations such as the following shall be evaluated:
mechanical strength, wire-bending space, arcing effects 110.3(A)(2),(3), and (6)
A neutral conductor is the conductor connected to the of a system, which is intended to carry neutral current under normal conditions.
neutral point 100 Neutral Conductor
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 in the direction of egress and be equipped with panic hardware or other devices so the door can open under simple pressure 110.26(C)(3)
"Varying duty" is defined as __ .
operation at loads, and for intervals of time, both of which may be subject to wide variations 100 Duty, Varying
In locations where electrical equipment is likely to be exposed to _ , enclosures or guards shall be so arranged and of such strength as to prevent such damage.
physical damage 110.27(B)
A is a chamber to which one or more ducts are connected and form part of the air distribution system.
plenum 100 Plenum
If neutral conductors of different voltage systems are installed in the same raceway, cable, or enclosure, the means of identification of the different neutrals shall be documented in a manner that's _ or be permanently posted where the conductors of different systems originate.
readily available, 200.6(D)
When one electrical circuit controls another circuit through a relay, the first circuit is called a" __ ."
remote-control circuit 100 Remote-Control Circuit
The connection between the grounded conductor and the supply-side bonding jumper or equipment grounding conductor, or both, at a __ is called a "system bonding jumper."
separately derived system Bonding Jumper, System
A branch-circuit overcurrent device is capable of providing protection for __ .
service conductors, feeders, branch circuits, 100 Overcurrent Protective Device, Brach-Circuit
The __ is the necessary equipment, usually consisting of a circuit breaker(s) or switch(es) and fuse(s) and their accessories, connected to the load end of service conductors, and intended to constitute the main control and cutoff of the supply.
service equipment 100 Service Equipment
The overhead system service-entrance conductors are the service conductors between the terminals of and a point where they are joined by a tap or splice to the service drop or overhead service conductors.
service equipment 100 Service-Entrance Conductors, Overhead System
When the Code uses " __ ," it means the identified actions are allowed but not required, and they may be options or alternative methods
shall be permitted 90.5 (B) Mandatory Rules, Permissive Rules, and Explanatory Material. (B) Permissive Rules. Permissive rules of this Code are those that identify actions that are allowed but not required, are normally used to describe options or alternative methods, and are characterized by the use of the terms shall be permitted or shall not be required
Wiring shall be installed so that the completed system will be free from __ , other than as required or permitted elsewhere in the Code.
short circuits, ground faults, connections to the earth, 110.7
Connected to ground without the insertion of any resistor or impedance device is referred to as " __ . "
solidly grounded 100 Grounded Solidly
Multiwire branch circuits shall_____
supply only line-to-neutral loads, 210.4(C)
Many terminations and equipment are marked with _ .
the manufacturer's initials 110.14 Note
Each disconnecting means shall be legibly marked to indicate its purpose unless located and arranged so _ .
the purpose is evident 110.22(A)
For a circuit to be considered a multiwire branch circuit, it shall have _____.
two or more ungrounded conductors with a voltage potential between them, a grounded conductor having equal voltage potential between it and each ungrounded conductor of the circuit, a grounded conductor connected to the neutral or grounded terminal of the system 100 Branch Circuit, Multiwire
Where more than one nominal voltage system supplies branch circuits in a building, each _ conductor of a branch circuit shall be identified by phase and system at all termination, connection, and splice points.
ungrounded, 210.5(C)(1)
A power supply used to provide alternating-current power to a load for some period of time in the event of a power failure is known as a(n) " __ ."
uninterruptible power supply 100 Uninterruptible Power Supply
Communications equipment includes equipment used for the transmission of ______.
video 100 Communications Equipment
An enclosure constructed so that moisture will not enter the enclosure under specific test conditions is called " __ . "
watertight 100 Watertight
Conduit instal led underground or encased in concrete slabs that are in direct contact with the earth is considered a __ location.
wet 100 Location, Wet
Receptacles shall have the terminal intended for connection to the grounded conductor identified by a metal or metal coating that is substantially _ in color.
white, 200.10(B)(1)
A three-phase, 4-wire, _ power system used to supply power to nonlinear loads may necessitate that the power system design allow for the possibility of high harmonic current on the neutral conductor.
wye-connected, 210.4(A) Note
A single receptacle is a single contact device with no other contact device on the same______.
yoke 100 Receptacle