Bonding and Grounding
Grounding electrode conductors smaller than _____ AWG shall be protected in rigid metal conduit, IMC, PVC conduit, electrical metallic tubing, or cable armor. A) 10 B) 8 C) 6 D) 4
C) 6
A main bonding jumper shall be a _____ or similar suitable conductor. A) wire B) bus C) screw D) any of these
D) any of these
A grounding electrode shall be required if a building or structure is supplied by a feeder. A) True B) False
A) True
Grounding electrode conductor taps from a separately derived system to a common grounding electrode conductor are permitted when a building or structure has multiple separately derived systems, provided that the taps terminate at the same point as the system bonding jumper. A) True B) False
A) True
Local metal underground systems or structures such as underground tanks are permitted to serve as grounding electrodes. A) True B) False
A) True
Mechanical elements used to terminate a grounding electrode conductor to a grounding electrode shall be accessible. A) True B) False
A) True
A fitting is defined as an accessory such as a locknut, bushing, or other part of a wiring system that is intended primarily to perform a(an) _____ rather than an electrical function. A) mechanical B) supplemental C) auxiliary D) physical
A) mechanical
A grounding electrode at a separate building or structure shall be required where one multiwire branch circuit serves the building or structure. A) True B) False
B) False
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. A) True B) False
B) False
Only wiring methods recognized as _____ are included in this Code. A) expensive B) efficient C) suitable D) cost effective
C) suitable
What size copper grounding electrode conductor is required for a service that has three sets of 600 kcmil copper conductors per phase? A) 1 AWG B) 1/0 AWG C) 2/0 AWG D) 3/0 AWG
D) 3/0 AWG
Product testing, evaluation, and listing (product certification) shall be performed by _____. A) recognized qualified electrical testing laboratories B) the manufacturer C) qualified person D) electrical engineer
A) recognized qualified electrical testing laboratories
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. A) separately derived B) classified C) direct D) emergency
A) separately derived
Lightning protection system ground terminals _____ bonded to the building or structure grounding electrode system. A) shall be B) shall not be C) shall be permitted to be D) must be effectively
A) shall be
A conductor installed on the supply side of a service or within a service equipment enclosure, or for a separately derived system, to ensure the required electrical conductivity between metal parts required to be electrically connected is known as the \"_____.\" A) supply-side bonding jumper B) ungrounded conductor C) electrical supply source D) grounding electrode conductor
A) supply-side bonding jumper
When a single equipment grounding conductor is used for multiple circuits in the same raceway, cable, or cable tray, the single equipment grounding conductor shall be sized according to the _____. A) combined rating of all the overcurrent devices B) largest overcurrent device protecting the circuit conductors C) combined rating of all the loads D) any of these
B) largest overcurrent device protecting the circuit conductors
The NEC is _____. A) intended to be a design manual B) meant to be used as an instruction guide for untrained persons C) for the practical safeguarding of persons and property D) published by the Bureau of Standards
C) for the practical safeguarding of persons and property
Where a building or structure contains more than one service disconnect in separate enclosures, grounding electrode conductor connections shall be permitted to be _____. A) multiple individual grounding electrode conductors B) one grounding electrode conductor at a common location C) a common grounding electrode conductor and taps D) any of these
D) any of these
_____ on equipment to be grounded shall be removed from contact surfaces to ensure good electrical continuity. A) Paint B) Lacquer C) Enamel D) any of these
D) any of these
Unused openings other than those intended for the operation of equipment, intended for mounting purposes, or permitted as part of the design for listed equipment shall be _____. A)filled with cable clamps or connectors only B) taped over with electrical tape C) repaired only by welding or brazing in a metal slug D) closed to afford protection substantially equivalent to the wall of the equipment
D) closed to afford protection substantially equivalent to the wall of the equipment
Coaxial cable is a cylindrical assembly composed of a conductor centered inside a metallic tube or shield, separated by a(an) _____ material and usually covered by an insulating jacket. A) insulating B) conductive C) isolating D) dielectric
D) dielectric
Nonmandatory Informative Annexes contained in the back of the Code book are _____. A) for information only B) not enforceable as a requirement of the Code C) enforceable as a requirement of the Code D) for information only and not enforceable as a requirement of the Code
D) for information only and not enforceable as a requirement of the Code
Some cleaning and lubricating compounds can cause severe deterioration of many plastic materials used for insulating and structural applications in equipment. A) True B) False
A) True
The common point on a wye-connection in a polyphase system is a \"neutral point.\" A) True B) False
A) True
Two or more grounding electrodes bonded together are considered a single grounding electrode system. A) True B) False
A) True
When an underground metal water piping system is used as a grounding electrode, bonding shall be provided around insulated joints and around any equipment that is likely to be disconnected for repairs or replacement. A) True B) False
A) True
"Communications equipment" is the electronic equipment that performs the telecommunications operations for the transmission of _____, and includes power equipment, technical support equipment, and conductors dedicated solely to the operation of the equipment. Question ID:52074 A) audio B) video C) data D) all of these
D) all of these
As used in the NEC, equipment includes _____. A) fittings B) appliances C) machinery D) all of these
D) all of these
Chapters 5, 6, and 7 of the NEC apply to _____. A) special occupancies B) special equipment C) special conditions D) all of these
D) all of these
Installations used to export electric power from vehicles to premises wiring or for _____ current flow are covered by the NEC. A) emergency B) primary C) bidirectional D) secondary
C) bidirectional
A \"raceway\" is an enclosed channel designed expressly for the holding of wires, cables, or busbars, with additional functions as permitted in the Code. A) True B) False
A) True
A duplex receptacle is an example of a multiple receptacle that has two receptacles on the same _____. A) yoke or strap B) strap C) device D) cover plate
A) yoke or strap
In an ac system, if the size of the grounding electrode conductor or bonding jumper connected to a concrete-encased electrode does not extend on to other types of electrodes that require a larger size of conductor, the grounding electrode conductor shall not be required to be larger than _____ AWG copper. Question ID:52780 A) 10 B) 8 C) 6 D) 4
D) 4
In judging equipment for approval, considerations such as _____ shall be evaluated. A) mechanical strength B) wire-bending space C) arcing effects D) all of these
D) all of these
Connected to ground without the insertion of any resistor or impedance device is referred to as \"_____.\" A) grounded B) solidly grounded C) effectively grounded D) a grounding conductor
B) solidly grounded
A(An) _____ AWG or larger copper or aluminum grounding electrode conductor exposed to physical damage shall be protected in rigid metal conduit, IMC, Schedule 80 PVC conduit, reinforced thermosetting resin conduit Type XW (RTRC-XW), EMT, or cable armor. A) 10 B) 8 C) 6 D) 4
C) 6
Receptacle yokes designed and _____ as self-grounding can, in conjunction with the supporting screws, establish the equipment bonding between the device yoke and a flush-type box. A) approved B) advertised C) listed D) installed
C) listed
The NEC does apply to installations in _____. A) floating buildings B) mobile homes C) recreational vehicles D) all of these
D) all of these
The intersystem bonding termination shall _____. A) be accessible for connection and inspection B) consist of a set of terminals with the capacity for connection of not less than three intersystem bonding conductors C) not interfere with opening the enclosure for a service, building/structure disconnecting means, or metering equipment D) all of these
D) all of these
In grounded systems, normally noncurrent-carrying electrically conductive materials that are likely to become energized shall be connected _____ in a manner that establishes an effective ground-fault current path. A) together B) to the electrical supply source C) to the closest grounded conductor D) together and to the electrical supply source
D) together and to the electrical supply source
Electrically conductive materials that are likely to _____ in ungrounded systems shall be connected together and to the supply system grounded equipment in a manner that creates a low-impedance path for ground-fault current that is capable of carrying the maximum fault current likely to be imposed on it. A) become energized B) require service C) be removed D) be coated with paint or nonconductive materials
A) become energized
Bare or covered aluminum or copper-clad aluminum grounding electrode conductors without an extruded polymeric covering shall not be installed where subject to corrosive conditions or be installed in direct contact with _____. A) concrete B) bare copper conductors C) wooden framing members D) all of these
A) concrete
Electrical equipment secured to and in _____ contact with a metal rack or structure provided for its support shall be permitted to be considered as being connected to an equipment grounding conductor if the metal rack or structure is connected to an equipment grounding conductor by one of the means indicated in 250.134. A) electrical B) direct C) metal to metal D) mechanical
A) electrical
Chapters 1 through 4 of the NEC apply _____. A) generally to all electrical installations B) only to special occupancies and conditions C) only to special equipment and material D) all of these
A) generally to all electrical installations
Type MC cable provides an effective ground-fault current path and is recognized by the NEC as an equipment grounding conductor _____. A) when it contains an insulated or uninsulated equipment grounding conductor in compliance with 250.118(1) B) when the cable assembly contains a bare copper conductor C) only when it is hospital grade Type MC cable D) when it is terminated with bonding bushings
A) when it contains an insulated or uninsulated equipment grounding conductor in compliance with 250.118(1)
\"Ungrounded\" means not connected to ground or to a conductive body that extends the ground connection. Question ID:52206 A)True B)False
A)True
\"Underground system service-entrance conductors\" are the service conductors between the terminals of the _____ and the point of connection to the service lateral or underground service conductors. A)service equipment B) service point C) grounding electrode D) equipment grounding conductor
A)service equipment
Installations shall comply with the material located in the NEC Annexes because they are part of the requirements of the Code. A) True B) False
B) False
The Code covers underground mine installations and self-propelled mobile surface mining machinery and its attendant electrical trailing cable. A) True B) False
B) False
The term \"Luminaire\" means a single individual lampholder by itself. A) True B) False
B) False
Conductor sizes are expressed in American Wire Gage (AWG) or in _____. A) inches B) circular mils C) square inches D) cubic inches
B) circular mils
Ferrous metal raceways and enclosures for grounding electrode conductors shall be bonded at each end of the raceway or enclosure to the grounding electrode or grounding electrode conductor to create a(an) _____ parallel path. A) mechanically B) electrically C) physically D) effective
B) electrically
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. A)service B) feeder C) branch circuit D) all of these
B) feeder
Article 100 contains definitions essential to the application of the Code. Definitions are also found in _____. A) the index B) the annex C) XXX.2 sections of other articles D) article scope(s)
C) XXX.2 sections of other articles
A rebar-type concrete-encased electrode installed in accordance with 250.52(A)(3) with an additional rebar section extended from its location within the concrete foundation or footing to an accessible location that is not subject to _____ shall be permitted for connection of grounding electrode conductors and bonding jumpers. A) physical damage B) moisture C) corrosion D): any of these
C) corrosion
An effective ground-fault current path is an intentionally constructed, low-impedance electrically conductive path designed and intended to carry current during a ground-fault condition from the point of a ground fault on a wiring system to _____. A) ground B) earth C) the electrical supply source D) the grounding electrode
C) the electrical supply source
For ungrounded systems, noncurrent-carrying conductive materials enclosing electrical conductors or equipment, or forming part of such equipment, shall be connected together and to the supply system grounded equipment in a manner that creates a low-impedance path for ground-fault current that is capable of carrying _____. A) the maximum branch-circuit current B) at least twice the maximum ground-fault current C) the maximum fault current likely to be imposed on it D) the equivalent of the main service rating
C) the maximum fault current likely to be imposed on it
A device that, when inserted in a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle is called a(an) "_____." A) attachment plug B) plug cap C) plug D) any of these
D) any of these
An equipment grounding conductor shall be identified by _____. A) a continuous outer finish that is green B) being bare C) a continuous outer finish that is green with one or more yellow stripes D) any of these
D) any of these
Reinforcing bars for use as a concrete-encased electrode can be bonded together by the usual steel tie wires or other effective means. A) True B) False
A) True
A \"service drop\" is defined as the overhead conductors between the utility electric supply system and the _____. A) service equipment B) service point C) grounding electrode D) equipment grounding conductor
B) service point
Equipment that is capable of being reached for operation, renewal, and inspection defines _____. A) accessible (as applied to equipment) B) accessible (as applied to wiring methods) C) accessible, readily D) all of these
A) accessible (as applied to equipment)
For a separate building or structure supplied by a separately derived system when overcurrent protection is provided where the conductors originate, the supply conductors shall contain _____. A) an equipment grounding conductor B) copper conductors only C) GFI protection for the feeder D) all of these
A) an equipment grounding conductor
Where the box is mounted on the surface, direct metal-to-metal contact between the device yoke and the box shall be permitted to ground the receptacle to the box if at least _____ of the insulating washers of the receptacle is (are) removed. A) one B) two C) three D) four
A) one
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) "_____." A) cord cap attachment B) attachment fitting C) end cap fitting D) attachment plug
B) attachment fitting
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. Question ID:52208 A) lowest B) greatest C) average D) nominal
B) greatest
A(An) _____ is an unintentional, electrically conductive connection between an ungrounded conductor of an electrical circuit, and the normally noncurrent-carrying conductors, metallic enclosures, metallic raceways, metallic equipment, or earth. A) grounded conductor B) ground fault C) equipment ground D) bonding jumper
B) ground fault
Service metal raceways and metal-clad cables are considered effectively bonded when using threadless couplings and connectors that are _____. A) nonmetallic B) made up tight C) sealed D) classified
B) made up tight
The common grounding electrode conductor installed for multiple separately derived systems shall be permitted to be a _____ pipe that complies with 250.68(C)(1). A) metal gas B) metal water C) PVC water D) any of these
B) metal water
If a building or structure is supplied by a feeder from an outdoor separately derived system, a system bonding jumper at both the source and the first disconnecting means shall be permitted if doing so does not establish a(an) _____ path for the grounded conductor. A) series B) parallel C) conductive D) effective
B) parallel
A handhole enclosure is an enclosure for use in underground systems, provided with an open or closed bottom, and sized to allow personnel to _____. A) enter and exit freely B) reach into but not enter C) have full working space D) visually examine the interior
B) reach into but not enter
The connection between the grounded circuit conductor and the supply-side bonding jumper or equipment grounding conductor, or both, at a _____ is called a \"system bonding jumper.\" A) service disconnect B) separately derived system C) motor control center D) separate building or structure disconnect
B) separately derived system
Where the resistance-to-ground of 25 ohms or less is not achieved for a single rod electrode, _____. A) other means besides electrodes shall be used in order to provide grounding B) the single rod electrode shall be supplemented by one additional electrode C) additional electrodes must be added until 25 ohms is achieved D) any of these
B) the single rod electrode shall be supplemented by one additional electrode
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. A) are B) are sometimes C) are not D) may be
C) are not
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 most recent previous edition of the Code adopted by that jurisdiction. A) electrical engineer B) master electrician C) authority having jurisdiction D) permit holder
C) authority having jurisdiction
An electrode encased by at least 2 in. of concrete, located horizontally near the bottom or vertically and within that portion of a concrete foundation or footing that is in direct contact with the earth, shall be permitted as a grounding electrode when it consists of _____. A) bare copper conductor not smaller than 8 AWG B) bare copper conductor not smaller than 6 AWG C) bare copper conductor not smaller than 4 AWG D) bare copper conductor not smaller than 1/0 AWG
C) bare copper conductor not smaller than 4 AWG
The NEC defines a(an) "_____" as a structure that stands alone or that is separated from adjoining structures by fire walls. A) unit B) apartment C) building D) utility
C) building
The structural metal frame of a _____ shall not be used as an equipment grounding conductor. A) roof or crawl space B) wall or ceiling C) building or structure D) floor or window
C) building or structure
A device that provides a means to connect intersystem bonding conductors for _____ systems to the grounding electrode system is an \"intersystem bonding termination.\" A) limited-energy B) low-voltage C) communications D) power and lighting
C) communications
Concrete-encased electrodes of _____ shall not be required to be part of the grounding electrode system where the steel reinforcing bars or rods aren't accessible for use without disturbing the concrete. A) hazardous (classified) locations B) health care facilities C) existing buildings or structures D) agricultural buildings with equipotential planes
C) existing buildings or structures
Connected (connecting) to ground or to a conductive body that extends the ground connection is called \"_____.\" A) equipment grounding B) bonded C) grounded D) all of these
C) grounded
A system or circuit conductor that is intentionally grounded is called a(an) "_____." Question ID:52112 A)grounding conductor B) unidentified conductor C) grounded conductor D) grounding electrode conductor
C) grounded conductor
Connectors and terminals for conductors more finely stranded than Class B and Class C, as shown in Table 10 of Chapter 9, shall be _____ for the specific conductor class or classes. A) listed B) approved C) identified D) all of these
C) identified
Where the supply conductors are larger than 1,100 kcmil copper or 1,750 kcmil aluminum, the main bonding jumper shall have an area that is _____ the area of the largest phase conductor when of the same material. A) at least equal to B) at least 50 percent of C) not less than 12 1/2 percent of D) not more than 12 1/2 percent of
C) not less than 12 1/2 percent of
A panel, including buses and automatic overcurrent devices, designed to be placed in a cabinet or cutout box and accessible only from the front is known as a \"_____.\" A) switchboard keyboard_backspace selected B) disconnect C) panelboard D) switch
C) panelboard
Tightening torque values for terminal connections shall be as indicated on equipment or in installation instructions provide by the manufacturer. An approved means shall be used to _____ the indicated torque value. A) maximize keyboard_backspace selected B) adjust C) optimize D) achieve
D) achieve
Compliance with the Code and proper maintenance result in an installation that is _____. A) essentially free from hazards B) not necessarily efficient or convenient C) not necessarily adequate for good service or future expansion D) all of these
D) all of these
For grounded systems, electrical equipment and other electrically conductive material likely to become energized shall be installed in a manner that creates a _____ from any point on the wiring system where a ground fault may occur to the electrical supply source. A) circuit facilitating the operation of the overcurrent device B) low-impedance circuit C) circuit capable of safely carrying the ground-fault current likely to be imposed on it D) all of these
D) all of these
A conductor used to connect the system grounded conductor, or the equipment to a grounding electrode or to a point on the grounding electrode system, is called the \"_____ conductor.\" A) main grounding B) common main C) equipment grounding D) grounding electrode
D) grounding electrode
Grounded electrical systems shall be connected to earth in a manner that will _____. A) limit voltages due to lightning, line surges, or unintentional contact with higher-voltage lines B) stabilize the voltage-to-ground during normal operation C) facilitate overcurrent device operation in case of ground faults D) limit voltages due to lightning, line surges, or unintentional contact with higher-voltage lines and stabilize the voltage-to-ground during normal operation
D) limit voltages due to lightning, line surges, or unintentional contact with higher-voltage lines and stabilize the voltage-to-ground during normal operation
