NEC Code Question and Answer with Explanation

Ques.1. The NEC applies to the installation of

  1. Electrical conductors and equipment within or on public and private buildings
  2. Optical fiber cables
  3. Outside conductors and equipment on the premises
  4. All of the above

Answer.4.

The scope of the NEC is given in Section Section 90.2(A) says what is covered, and Section 90.2(B) lists those things that are not covered.

NEC 90.2(A).

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.

Ques.2. 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.

  1. Electrical engineer
  2. Master electrician
  3. Authority having jurisdiction
  4. Permit holder

Answer.3. (90.4)

The Code is suitable for compulsory application by governmental bodies, including signaling and communications systems of legal jurisdiction over electrical installations, and for use by insurance inspectors. The authority having jurisdiction for the enforcement of the Code has the responsibility to interpret the rules, to decide on the approval of equipment and materials, and to grant special permissions contemplated in a number of rules.

By special permission, authorities with jurisdiction may waive specific requirements in this Code or allow alternative methods where it is assured that similar objectives can be achieved by establishing and maintaining effective protection.

Ques.3. The NEC does not apply to electric utility-owned wiring and equipment __ .

  1. Installed by an electrical contractor
  2. Installed on public property
  3. Consisting of service drops or service laterals
  4. In a utility office building

Answer.3. 90.2 (B)

The scope of the NEC is given in Section Section 90.2(A) says what is covered, and Section 90.2(B) lists those things that are not covered.

NEC 90.2(B).

This Code does not cover the following:

  1. Ships, buildings floating in water creeks, railway rolling stock, aircraft, or motor vehicles other than mobile homes and installations other than recreational vehicles.
  2. Underground and self-propelled mobile surface mining machinery and its attendant electrical trailing cables in mines.
  3. Installations of railways for the generation, transmission, or distribution of electricity used exclusively for the operation of rolling stock or installations used exclusively for signaling and communications purposes
  4. Installations of communication equipment under the control of communications utilities in exteriors or building spaces used exclusively for such installations.
    1. Establishment where such installation takes place under the exclusive control of an electric utility consisting of service drop or service lateral and related metering.
    2. Officially established easements for such establishments are located in the manner recognized by public service commissions, utility commissions, or other regulatory agencies.
    3. Are on property owned or leased by an electric utility for the purpose of communication, measurement, production, control, conversion, transmission, or distribution of electric energy.

Ques.4. The main purpose of NEC is

  1. Intended to be a design manual
  2. Published by the Bureau of Standards
  3. Meant to be used as an instruction guide for untrained persons
  4. For the practical safeguarding of persons and property

Answer.4. 90.1 (A)

Practical protection or safeguarding: – The purpose of this Code is the practical protection of persons and property from hazards arising from the use of electricity.

Adequacy: – This Code contains provisions that are considered necessary for protection & safety. Compliance with installation and proper maintenance results is essentially free from hazards, but not necessarily efficient, convenient, or adequate for good service or expanding future electricity usage.

Ques.5. 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.

  1. Are sometimes
  2. Are
  3. May be
  4. Are Not

Answer.4. (90.2 B)

According to NEC code 90.2 B, 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.

Ques.6. ______ 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.

  1. Time unit
  2. Inverse Time
  3. Time Delay
  4. Adverse Time

Answer.2.  (100 circuit Breaker)

Ques.7. When the Code uses ” __ ” it means the identified actions are allowed but not required, and they may be options or alternative methods.

  1. Shall
  2. Shall be permitted
  3. Shall not
  4. Option 3 & 4

Answer.2. 90.5 (b)

NEC code 90.5 described Mandatory Rules, Permissive Rules, and Explanatory Material

According to 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 that shall be permitted or shall not be required.

Ques.8. For a circuit to be considered a multiwire branch circuit, it shall have

  1. Two or more ungrounded conductors with a voltage potential between them.
  2. A grounded conductor having equal voltage potential between it and each ungrounded conductor of the circuit
  3. A grounded conductor connected to the neutral or grounded, the terminal of the system
  4. All of these

Answer.4. 100 branch circuit multiwire

Branch Circuit, Multiwire:- A branch circuit that consists of two or more ungrounded conductors that have a voltage potential between them and a grounded conductor that has an equal voltage between it and each ungrounded conductor of the circuit and that is connected to the neutral or grounded conductor of the system.

Ques.9. Nonmandatory Informative Annexes contained in the back of the Codebook

  1. Are for information only
  2. Aren’t enforceable as a requirement of the Code
  3. Are enforceable as a requirement of the Code
  4. A and B

Answer.4. 90.5 d

According to NEC code 90.5 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.

Ques.10. A branch circuit supplies energy to one or more outlets to which appliances are to be connected.

  1. General-purpose
  2. Multiwire
  3. Individual
  4. Appliance

Answer.4. 100 branch circuit appliance

Branch Circuit, Appliance:- A branch circuit that supplies energy to one or more outlets to which appliances are to be connected and that has no permanently connected luminaires that are not a part of an appliance.

Ques.11. A reliable conductor that ensures electrical conductivity between metal parts of the electrical installation that are required to be electrically connected is called a “

  1. Grounding electrode
  2. Auxiliary ground
  3. Bonding conductor or jumper
  4. Tap conductor

Answer.3. 100 bonding conductor or jumper

A bonding conductor or jumper is a reliable conductor to ensure the required electrical conductivity between metal parts required to be electrically connected.

The primary purpose of a bonding conductor or jumper is to ensure electrical conductivity between two conductive bodies, such as a box and a metal raceway. Bonding jumpers are particularly important where a box contains either concentric- or eccentric-type knockouts. These knockouts can spoil the electrical conductivity between the metal parts and actually introduce unnecessary impedance in the grounding path.

Ques.12. 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

  1. Accessible (as applied to equipment)
  2. Accessible (as applied to wiring methods)
  3. Accessible, readily
  4. All of these

Answer.2. 100 accessible

Accessible (as applied to wiring methods). 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.

Ques.13. 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

  1. Short-circuit rating
  2. Ground-fault rating
  3. Ampacity
  4. All of these

Answer.3. 100 ampacity

Ampacity. The maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating.

The definition of the term amplicity states that the maximum current carried by a conductor varies continuously with the conditions of use as well as the temperature rating of the conductor insulation. For example, ambient temperature is a condition of use. A conductor with insulation rated at 60 ° C and installed near a furnace where the ambient temperature is maintained constant at 60 ° C with no current-carrying capacity. Any current flowing through the conductor will raise its temperature above a 60 ° C insulation rating. Therefore, the mobility of this conductor, regardless of its size, is zero.

Ques.14. 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.”

  1. Service disconnect
  2. Separately derived system
  3. Motor control center
  4. Separate building or structure disconnect

Answer.2. 100 bonding jumper system

The connection between the grounded circuit conductor and the supply-side bonding jumper, or the equipment grounding conductor, or both, at a separately derived system.

The system bonding jumper can be installed in several ways. For example, if a multi-barrel lug is connected to the XO terminal of a transformer, the system bonding jumper, grounding electrode conductor, grounded conductor, and bonding jumper can be connected at that connector. If a multi-barrel lug is connected to the transformer or generator enclosure, it is common to connect the system bonding jumper, grounding electrode conductor and the bonding jumper or conductor to that connector. The grounded conductor must always directly connected to the XO terminal. A system bonding jumper is used to connect the equipment grounding conductor(s) or the supply-side bonding jumper to the grounded conductor of a separately derived system either at the source or at the first system disconnecting means. A system bonding jumper is used in a derivative system if the derivative system has a grounded conductor.

Like the main bonding jumper on the service equipment, the system bonding jumper provides the necessary link between the equipment grounding conductor and the system grounded conductor to establish an effective path for the ground-fault current to return to the source.

 

Ques.15. An accessory, such as a locknut, intended to perform a mechanical function best describes

  1. A part
  2. Equipment
  3. A device
  4. A fitting

Answer.4. A fitting

An accessory such as a locknut, bushing, or other parts of a wiring system that is intended primarily to perform a mechanical rather than an electrical function.

Items such as condulets, conduit couplings, EMT connectors and couplings, and threadless connectors are considered fittings.

Ques.16. An enclosure or piece of equipment constructed so that dust will not enter the enclosure under specified test conditions is known as ____

  1. Dust-tight
  2. Dustproof
  3. Dust rated
  4. All of these

Answer.1. Dust-tight

A  dust tight enclosure is constructed so that dust will not enter the enclosing case under specified test conditions.

Ques.17. For wiring methods, “on or attached to the surface, or behind access panels designed to allow access” is known as

  1. Open
  2. Uncovered
  3. Exposed
  4. Bare

Answer.c. 100 exposed as apply to the wiring method

For wiring methods, “on or attached to the surface, or behind access panels designed to allow access” is known as Exposed.

Wiring methods would be considered “exposed” because they are located above a suspended ceiling with lift-out panels.

Ques.18. A unit of an electrical system that carries or controls electric energy as its principal function is a(n) ” __ .”

  1. Raceway
  2. Fitting
  3. Device
  4. Enclosure

Answer.3. 100 devices

A unit of an electrical system that carries or controls electric energy as its principal function is known as a Device.

Components (such as switches, circuit breakers, fuse holders, receptacles, attachment plugs, and lamp holders) that distribute or control but do not consume electrical energy are considered devices. Devices that consume incidental amounts of electrical energy in the performance of carrying or controlling electricity are also considered devices. Some examples of these components include a switch with an internal pilot light, a GFCI receptacle, and even a magnetic contactor.

Components (such as switches, circuit breakers, fuse holders, receptacles, attachment plugs, and lamp holders) that distribute or control electrical energy but do not consume electricity. Devices that consume incidental amounts of electrical energy in the performance of carrying or controlling electricity are also considered devices. Some examples of these components include a switch with an internal pilot light, a GFCI receptacle and a magnetic contactor.

Ques.19. 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 ” __ . “

  1. Overcurrent device
  2. Thermal apparatus
  3. Explosion-proof equipment
  4. Bomb casing

Answer.3.

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 ” Explosion-proof equipment. “

Ques.20. ______ are designed for surface mounting with a swinging door.

  1. Outlet boxes
  2. Cabinets
  3. Cutout boxes
  4. None of these

Answer.3

Cutout Box:- An enclosure that is designed for surface mounting and has swinging doors or covers secured directly to and telescoping with the walls of the box. proper.

Ques.21. Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts is called

  1. Guarded
  2. Covered
  3. Protection
  4. Enclosed

Answer.4.

Surrounded by a case, housing, fence, or wall(s) that prevents persons from accidentally contacting energized parts is called Enclosed.

Ques.22. A solderless pressure connector is a device between conductors or between conductors and a terminal by means of mechanical pressure.

  1. Provides access
  2. Protects the wiring
  3. Is never needed
  4. Establishes a connection

Answer.4. 100 connector pressure solder

Connector, Pressure (Solderless). A device that establishes a terminal between two or more conductors or between one or more conductors and by means of mechanical pressure and without the use of solder.

 

Ques.23. “Varying duty” is defined as __ .

  1. Intermittent operation in which the load conditions are regularly recurrent
  2. Operation at a substantially constant load for an indefinite length of time
  3. An operation for alternate intervals of load and rest, or load, no load, and rest
  4. Operation at loads, and for intervals of time, both of which may be subject to wide variations

Answer.4. 100 duty varying

Varying duty is a requirement of service that demands operation at loads, and for an interval of time, both of which may be subjected to wide variation. 

Ques.24. A conductor encased within material of composition or thickness that is not recognized by the NEC as electrical insulation is considered

  1. Noninsulating
  2. Bare
  3. Covered
  4. Protected

Answer.C

Conductor, Covered:- A conductor encased within material of composition or thickness that is not recognized by this Code as electrical insulation.

Typically covered conductors are green-covered instrument grounding conductor, which is within a non-metal sheathed cable or a composite cable of a type SE cable within an unwired or uninsulated grounded conductor. Covered conductors should always be considered as bare conductors for the approval of work as they are really uninsulated conductors.

Ques.25. Communications equipment includes equipment used for the transmission of

  1. Audio
  2. Video
  3. Data
  4. Any of these

Answer.4. 100 communications equipment

Communications Equipment:- The electronic equipment that performs the telecommunications operations for the transmission of audio, video, and data, and includes power equipment (e.g., dc converters, inverters, and batteries) and technical support equipment (e.g., computers).

Power supplies and computers are considered part of communication equipment and are thus subject to the requirements that apply to that device. Telephone switches are considered a part of telecommunications equipment and are therefore subject to similar requirements.

Ques.26. A neutral conductor is a conductor connected to the of a system, which is intended to carry neutral current under normal conditions.

  1. Grounding electrode
  2. Neutral point
  3. Intersystem bonding termination
  4. None of these

Answer.2

Neutral Point:- The common point on a wye-connection in a polyphase system or midpoint on a single-phase, 3-wire system, or midpoint of a single-phase portion of a 3-phase delta system, or a midpoint of a 3-wire, direct-current system.

At the neutral point of the system, the vectorial sum of the nominal voltages from all other phases within the system that utilizes the neutral, with respect to the neutral point, is zero potential.

Ques.27. A hoistway is any __ in which an elevator or dumbwaiter is designed to operate.

  1. Hatchway or well hole
  2. Vertical opening or space
  3. Shaftway
  4. All of these

Answer.4.

Hoistway:– Any shaftway, hatchway, well hole, or other vertical opening or space in which an elevator or dumbwaiter is designed to operate.

Ques.28. Conduit install led underground or encased in concrete slabs that are in direct contact with the earth is considered a _____location.

  1. Dry
  2. Damp
  3. Wet
  4. Moist

Answer.3.

Location, Wet:– Installations underground or in concrete slabs or masonry in direct contact with the earth; in locations subject to saturation with water or other liquids, such as vehicle washing areas; and in unprotected locations exposed to the weather.

It is intended that the inside of a raceway in a wet location or a raceway installed underground be considered a wet location. Therefore, any conductors contained therein would be required to be suitable for wet locations. It is the responsibility of the authority having jurisdiction to assess the environmental, factors associated with a given installation in order to determine the type of location, either dry, damp, or wet.

Ques.29. A” __ ” is an accommodation with two or more contiguous rooms comprising a compartment that provides living, sleeping, sanitary, and storage facilities.

  1. Guest room
  2. Guest suite
  3. Dwelling unit
  4. Single-family dwelling

Answer.2.

Guest suite:- An accommodation with two or more contiguous rooms comprising a compartment, with or without doors between such rooms, that provides living, sleeping, sanitary, and storage facilities.

Ques.30. 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.

  1. Dry
  2. Damp
  3. Wet
  4. Moist

Answer.2.

Location, Damp: Locations protected from weather and not subject to saturation with water or other liquids but subject to moderate degrees of moisture. Examples of such locations include partially protected locations under canopies, marquees, roofed open porches, and like locations and interior locations subject to moderate degrees of moisture, such as some basements, some barns, and some cold-storage warehouses.

Ques.31. The installed conductive path(s) that connects normally non-current-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) __ .

  1. Grounding electrode conductor
  2. Grounding conductor
  3. Equipment grounding conductor
  4. None of these

Answer.3.

Grounding Conductor, Equipment (EGC):- The conductive path(s) installed to connect normally non-current-carrying metal parts of equipment together and to the system grounded conductor or to the grounding electrode conductor, or both.

Equipment grounding conductors (EGCs) are bonded to the system-grounded conductor to provide a low-impedance path for fault current that will facilitate the automatic operation of overcurrent devices under ground-fault conditions or facilitate the operation of ground detectors on ungrounded systems. When an energized (ungrounded) conductor makes electrical contact with the ground or a grounded part, the connection is called a ground fault. Low-impedance paths between a grounded part and the grounded service conductor are necessary to allow fault currents to rise to high enough values to cause circuit breakers or fuses to operate quickly. While the same consideration applies to short circuits, short circuits alone do not involve equipment grounding circuit pathways although they may involve grounded conductors.

EGCs may be individual conductors, metallic raceways, cable trays, metallic cable sheaths, or a combination of a raceway or cable tray and an individual conductor. Conductors must be sized on the basis of the circuit overcurrent device rating, but those sizing requirements do not apply to raceways.

Ques.32. An outlet intended for the direct connection of a lamp holder or a luminaire is a(n) ” __ .”

  1. Outlet
  2. Receptacle outlet
  3. Lighting outlet
  4. General-purpose outlet

Answer.3

Lighting Outlet:- An outlet intended for the direct connection of a lamp holder, a lighting fixture, or a pendant cord terminating in a lamp holder.

Ques.33. A Class A GFCI protection device is designed to trip when the ground-fault current to ground is __ or higher.

  1. 4 mA
  2. 5 mA
  3. 6 mA
  4. None of these

Answer.3. 100 note ground fault circuit interruption

A device intended for the protection of personnel that functions to de-energize a circuit or portion thereof within an established period of time when a current to ground exceeds the values established for a Class A device.

Class A ground-fault circuit interrupters trip when the current to ground is 6 mA or higher and do not trip when the current to ground is less than 4 mA.

Ques.34. A device that provides a means to connect bonding conductors for __ systems to the building grounding electrode system is an intersystem bonding termination.

  1. Limited energy
  2. Low-voltage
  3. Communications
  4. Power and lighting

Answer.3. intersystem bonding termination

Intersystem Bonding Termination:- A device that provides a means for connecting bonding conductors for communications systems to the grounding electrode system.

An intersystem bonding termination provides suitable means to comply with the requirements for intersystem bonding and grounding of communication systems. The termination would have sufficient capacity to handle multiple communication systems (telecom, satellite, CATV) on premises. The intersystem bonding termination device is intended to provide a means of connecting these grounding conductors to the service, building, or structure grounding electrode system. This is an important safety measure to prevent occurrences of voltages between the communication system and the power system. Frequently, in new construction, the grounding electrode, the raceway, and the grounding electrode conductor are hidden behind walls and are not accessible for bonding connection.

 

Ques.35. Connected to ground without the insertion of any resistor or impedance device is referred to as

  1. Grounded
  2. Solidly grounded
  3. Effectively grounded
  4. Grounding conductor

Answer.2. Grounded solidity

Solidly Grounded (Grounded, Solidly):- Connected to the ground without inserting any resistor or impedance device.

The term solidly grounded suggests that the resistance or impedance of the grounding electrode conductor is ignored. The system is considered solidly grounded when it is connected to the grounding electrode with a copper or aluminum grounding electrode conductor, so long as an impedance device such as a resistor or inductor is not located in the path from the service equipment or separately derived system to the grounding electrode. Another common type of system grounding is impedance or high-impedance grounding. A resistor or an inductor is inserted in the grounded conductor path from the grounding electrode to the service equipment or feeder equipment. This limits the fault current on the first ground fault. 

Ques.36. Within sight means visible and not more than from the equipment.

  1. 10
  2. 20
  3. 25
  4. 15

Answer.4. 100 in sight

In Sight From (Within Sight From, Within Sight):- This Code specifies that one equipment shall be “in sight from,” “within sight from,” or “within sight of,” and so forth, another equipment, the specified equipment is to be visible and not more than 15 m (50 ft) distant from the other.

This definition typically applies to utilization equipment and disconnecting means. Under many circumstances, a disconnect is required to be within sight of and not more than 15 m (50 ft) from its associated equipment. The intent is to make sure that a person maintaining or repairing that utilization equipment can verify that the disconnecting means is off and the equipment is de-energized.

Ques.37. Connected to the ground or to a conductive body that extends the ground connection is called

  1. Equipment grounding
  2. Bonded
  3. Grounded
  4. All of these

Answer.3.

Grounded (Grounding):- Connected (connecting) to the ground or to a conductive body that extends the ground connection.

Grounding is connecting an electrical system to the earth with a wire. Excess or stray current travels through this wire to a grounding device (commonly called a “ground”) deep in the earth. Grounding prevents unwanted voltage on electrical components.

Ques.38. 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.

  1. Service equipment
  2. Service
  3. Service disconnect
  4. Service overcurrent device

Answer.1.

Service Equipment:- 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 to a building or other structure, or an otherwise designated area, and intended to constitute the main control and cutoff of the supply.

Service equipment may include circuit breakers or fused switches that are provided to disconnect all ungrounded conductors in a building or other structure from the service- entrance conductors. It is important to understand that individual meter socket enclosures are not considered service equipment. A case can be made that the potential and current transformer cabinets associated with utility meter enclosures are also excluded from the definition of service equipment.

Ques.39. A single receptacle is a single contact device with no other contact device on the same

  1. Circuit
  2. Yoke
  3. Run
  4. Equipment

Answer.2.

Receptacle:- Receptacle means a contact device installed at the outlet for the connection of an attachment plug. A single receptacle is a single contact device with no other contact device on the same yoke. Multiple receptacles are two or more contact devices on the same yoke.

Ques.40. The overhead system service-entrance conductors are the service conductors between the terminals and the point where they are joined by a tap or splice to the service drop or overhead service conductors.

  1. Service entrance
  2. Service point
  3. Grounding electrode
  4. Equipment grounding conductor

Answer.1.

Service-Entrance Conductors, Overhead System:- The service conductors between the terminals of the service equipment and a point usually outside the building, clear of building walls, where joined by tap or splice to the service drop or overhead service conductors.

Ques.41. A is a chamber to which one or more ducts are connected and form part of the air distribution system.

  1. Riser
  2. Plenum
  3. 1 and 2
  4. None of the above

Answer.2

Plenum:- An air compartment or chamber to which one or more ducts are connected and which forms part of an Air distribution system. (In many buildings the space between the suspended ceiling and underside of floor above is used for the collection of return air.)

 

Ques.42. 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.

  1. Inside
  2. Outside
  3. Above
  4. 1 or 2

Answer.4. 100 service conductor underground

Service Conductors, Underground:- 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, inside or outside the building wall.

Where service equipment is located outside the building walls, there may be no service-entrance conductors or they may be entirely outside the building.

Where there is no terminal box, meter, or other enclosure, the point of connection is considered to be the point of entrance of the service conductors into the building.

Ques.43.A branch-circuit overcurrent device is capable of providing protection for __ .

  1. Service conductors
  2. Feeders
  3. Branch circuits
  4. All of these

Answer.4. 100 overcurrent protective device branch circuit

Branch-circuit overcurrent device:- A device capable of providing protection for service, feeder, and branch circuits and equipment over the full range of over-currents between its rated current and its interrupting rating. Branch-circuit overcurrent protective devices are provided with interrupting ratings appropriate for the intended use but no less than 5000 amperes.  The protection provided may be overload, short-circuit, or ground-fault, or a combination, depending on the application.

Ques.44. When one electrical circuit controls another circuit through a relay, the first circuit is called a” __ .”

  1. Primary circuit
  2. Remote-control circuit
  3. Signal circuit
  4. Controller

Answer.2

Remote-Control Circuit:- Any electrical circuit that controls any other circuit through a relay or an equivalent device.

Ques.45. Outline lighting may include an arrangement of __ to outline or call attention to the shape of a building.

  1. Incandescent lamps
  2. Electric-discharge lighting
  3. Electrically powered light sources
  4. Any of these

Answer.4. Outline lightning

Outline Lighting:- An arrangement of incandescent lamps, electric-discharge lighting, or other electrically powered light sources to outline or call attention to certain features such as the shape of a building or the decoration of a window. The outline lighting includes low-voltage, light-emitting diodes as well as other luminaires installed to form various shapes.

Ques.46. Wooden plugs driven into holes in __ or similar materials shall not be used for securing electrical equipment.

  1. Masonry
  2. Concrete
  3. Plaster
  4. All of these

Answer.4. 110.13(A)

Mounting:-  Electrical equipment shall be firmly secured to the surface on which it is mounted. Wooden plugs driven into holes in masonry, concrete, plaster, or similar materials shall not be used.

Ques.47. An enclosure constructed so that moisture will not enter the enclosure under specific test conditions is called _______

  1. Watertight
  2. Moistureproof
  3. Waterproof
  4. Rainproof

Answer.1.

Watertight:- Constructed so that moisture will not enter the enclosure under specified test conditions.

Ques.48. The NEC requires that electrical work be __ .

  1. Installed in a neat and workmanlike manner
  2. Installed under the supervision of a licensed person
  3. Completed before being inspected
  4. All of these

Answer.1. 110.12

Electrical equipment shall be installed in a neat and workmanlike manner. The code is basically giving authorization that empowers jurisdictions (AHJs) to reject work that does not meet industry standards.

Ques.49. 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.

  1. Lowest
  2. Greatest
  3. Average
  4. Nominal

Answer.2. 100 voltage (of circuit)

The voltage of a circuit is defined by the Code as the greatest root-mean-square (effective) difference of potential between any two conductors of the circuit concerned.

Ques.50. Unless identified for use in the operating environment, no conductors or equipment shall be __ having a deteriorating effect on the conductors or equipment.

  1. Located in damp or wet locations
  2. Exposed to fumes, vapors, liquids or gases
  3. Exposed to excessive temperatures
  4. All of these

Answer.4. 110.11

Deteriorating Agents:- Unless identified for use in the operating environment, no conductors or equipment shall be located in damp or wet locations; where exposed to gases, fumes, vapors, liquids, or other agents that have a deteriorating effect on the conductors or equipment; or where exposed to excessive temperatures.

Equipment not identified for outdoor use and equipment identified only for indoor use, such as “dry locations,” “in- door use only,” “damp locations,” or enclosure Types 1, 2, 5, 12, 12K, and/or 13, shall be protected against damage from the weather during construction.

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