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Questions and Answers
What is the maximum permitted load for a receptacle rated 30 amperes on a 30 ampere branch circuit supplying two or more receptacles?
What is the maximum permitted load for a receptacle rated 30 amperes on a 30 ampere branch circuit supplying two or more receptacles?
24 amperes
What is the maximum receptacle rating permitted to be used on a 15 ampere branch circuit that supplies two or more receptacles?
What is the maximum receptacle rating permitted to be used on a 15 ampere branch circuit that supplies two or more receptacles?
15
What is the maximum receptacle rating permitted to be used on a 30 ampere branch circuit that supplies two or more receptacles?
What is the maximum receptacle rating permitted to be used on a 30 ampere branch circuit that supplies two or more receptacles?
30
A 30-ampere branch circuit shall be permitted to supply fixed lighting units with heavy-duty lampholders as long it is not ____.
A 30-ampere branch circuit shall be permitted to supply fixed lighting units with heavy-duty lampholders as long it is not ____.
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An appliance receptacle for a dwelling shall be installed within ____ feet of the intended location of the appliance.
An appliance receptacle for a dwelling shall be installed within ____ feet of the intended location of the appliance.
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Section 210.52 provides requirements for which types of receptacle outlets?
Section 210.52 provides requirements for which types of receptacle outlets?
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When determining receptacle outlet requirements, if a sink is installed in an island, with a maximum ____ inch depth of countertop behind the sink, the countertop space is considered to be two separate countertop spaces.
When determining receptacle outlet requirements, if a sink is installed in an island, with a maximum ____ inch depth of countertop behind the sink, the countertop space is considered to be two separate countertop spaces.
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Receptacle outlets shall be located on or a maximum of ____ inches above a countertop.
Receptacle outlets shall be located on or a maximum of ____ inches above a countertop.
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Where a receptacle in a guest room is installed behind a bed, the receptacle shall be ____.
Where a receptacle in a guest room is installed behind a bed, the receptacle shall be ____.
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There shall be one 125-volt single phase 15- or 20-ampere receptacle outlet within 18 inches of the top of a show window for each ____ linear feet of the show window.
There shall be one 125-volt single phase 15- or 20-ampere receptacle outlet within 18 inches of the top of a show window for each ____ linear feet of the show window.
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A 125-volt, single-phase, 15- or 20-ampere-rated receptacle outlet shall be installed at an accessible location for the servicing of ____ equipment.
A 125-volt, single-phase, 15- or 20-ampere-rated receptacle outlet shall be installed at an accessible location for the servicing of ____ equipment.
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An indoor electrical service area shall be located in an accessible location within ____ feet of the electrical service equipment.
An indoor electrical service area shall be located in an accessible location within ____ feet of the electrical service equipment.
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At least one wall switch-controlled lighting outlet shall be installed in every ____.
At least one wall switch-controlled lighting outlet shall be installed in every ____.
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If an interior stairway with ____ or more risers has one or more lighting outlets, there shall be a wall switch at each floor level and landing level that includes an entryway.
If an interior stairway with ____ or more risers has one or more lighting outlets, there shall be a wall switch at each floor level and landing level that includes an entryway.
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Where equipment requiring servicing is located in an attic, underfloor space, utility room, or basement there shall be at least ____ lighting outlet located near that equipment.
Where equipment requiring servicing is located in an attic, underfloor space, utility room, or basement there shall be at least ____ lighting outlet located near that equipment.
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The minimum feeder-circuit conductor size shall have an allowable ampacity not less than the noncontinuous load plus ____ percent of the continuous load.
The minimum feeder-circuit conductor size shall have an allowable ampacity not less than the noncontinuous load plus ____ percent of the continuous load.
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Grounded conductors that are not connected to an overcurrent device shall be permitted to be sized at ____ percent of the continuous and noncontinuous loads.
Grounded conductors that are not connected to an overcurrent device shall be permitted to be sized at ____ percent of the continuous and noncontinuous loads.
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The minimum feeder conductor size shall have an allowable ampacity ____ the maximum load to be served after the application of any adjustment or correction factors.
The minimum feeder conductor size shall have an allowable ampacity ____ the maximum load to be served after the application of any adjustment or correction factors.
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The National Electrical Code is not intended as ______.
The National Electrical Code is not intended as ______.
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The provisions of the National Electrical Code are considered necessary for ______.
The provisions of the National Electrical Code are considered necessary for ______.
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What is not covered within the scope of the National Electrical Code?
What is not covered within the scope of the National Electrical Code?
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Which chapter of the National Electrical Code covers communications systems?
Which chapter of the National Electrical Code covers communications systems?
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The informational annexes of the National Electrical Code are for ______.
The informational annexes of the National Electrical Code are for ______.
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If the current edition of the National Electrical Code requires the use of a new product but that product is not yet available, then the _____ may permit the use of a product from the most recent previous edition.
If the current edition of the National Electrical Code requires the use of a new product but that product is not yet available, then the _____ may permit the use of a product from the most recent previous edition.
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A rule that identifies actions that are allowed but not required is ______.
A rule that identifies actions that are allowed but not required is ______.
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It is not necessary to inspect a piece of equipment that has not been altered or damaged and has been listed by a qualified electrical testing laboratory to be installed in a structure.
It is not necessary to inspect a piece of equipment that has not been altered or damaged and has been listed by a qualified electrical testing laboratory to be installed in a structure.
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Distribution centers located in readily accessible locations provide _______.
Distribution centers located in readily accessible locations provide _______.
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Limits on the number of circuits in a single enclosure minimize the effects from a _______.
Limits on the number of circuits in a single enclosure minimize the effects from a _______.
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Where units of measurement are used in the National Electrical Code they are given in _______ units.
Where units of measurement are used in the National Electrical Code they are given in _______ units.
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When a hard conversion is made the ________ may change.
When a hard conversion is made the ________ may change.
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Accessible as applied to equipment means admitting close approach and not guarded by ____.
Accessible as applied to equipment means admitting close approach and not guarded by ____.
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The ampacity is the maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its ______ rating.
The ampacity is the maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its ______ rating.
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An arc-fault circuit interrupter, or AFCI, is a device which provides protection from the effects of arc faults by _______.
An arc-fault circuit interrupter, or AFCI, is a device which provides protection from the effects of arc faults by _______.
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Askarel is a ______ term for a group of non-flammable synthetic chlorinated hydrocarbons used as electrical insulating media.
Askarel is a ______ term for a group of non-flammable synthetic chlorinated hydrocarbons used as electrical insulating media.
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Bonding means connecting to establish electrical ______.
Bonding means connecting to establish electrical ______.
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A bonding jumper is a connection between a grounded circuit conductor and ______, at a separately derived system.
A bonding jumper is a connection between a grounded circuit conductor and ______, at a separately derived system.
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A _____ is the circuit conductors between the final overcurrent device protecting the circuit and the outlets.
A _____ is the circuit conductors between the final overcurrent device protecting the circuit and the outlets.
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Finely divided solid material that is a maximum of ______ microns and presents a fire or explosion hazard dispersed and ignited in air is combustible dust.
Finely divided solid material that is a maximum of ______ microns and presents a fire or explosion hazard dispersed and ignited in air is combustible dust.
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A pressure connector is a device that establishes a connection between ________ by means of mechanical pressure and without the use of solder.
A pressure connector is a device that establishes a connection between ________ by means of mechanical pressure and without the use of solder.
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A composite optical fiber cable contains ______.
A composite optical fiber cable contains ______.
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A continuous load is a load where the maximum current is expected to continue for ______ hours or more.
A continuous load is a load where the maximum current is expected to continue for ______ hours or more.
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A ________ is a device by which the conductors of a circuit can be disconnected from their source of supply.
A ________ is a device by which the conductors of a circuit can be disconnected from their source of supply.
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Intermittent duty is described as the operation for alternate intervals of _______.
Intermittent duty is described as the operation for alternate intervals of _______.
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Any circuit conductor between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device is a _______.
Any circuit conductor between the service equipment, the source of a separately derived system, or other power supply source and the final branch-circuit overcurrent device is a _______.
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According to the National Electrical Code, an electric sign is _____ self-contained, electrically illuminated utilization equipment with words or symbols designed to convey information or attract attention.
According to the National Electrical Code, an electric sign is _____ self-contained, electrically illuminated utilization equipment with words or symbols designed to convey information or attract attention.
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Electric-discharge lighting is defined as systems of illumination which use ______.
Electric-discharge lighting is defined as systems of illumination which use ______.
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A ground fault is an unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally non-current-carrying conductors, metallic enclosures, or ______.
A ground fault is an unintentional, electrically conducting connection between an ungrounded conductor of an electrical circuit and the normally non-current-carrying conductors, metallic enclosures, or ______.
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An electrically conductive path from the point of a ground fault on a wiring system through normally non-current-carrying conductors to the electrical supply source is ________.
An electrically conductive path from the point of a ground fault on a wiring system through normally non-current-carrying conductors to the electrical supply source is ________.
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A combination of a compressor and motor enclosed in the same housing, with no external shaft or shaft seals, and the motor operating in the refrigerant is _________.
A combination of a compressor and motor enclosed in the same housing, with no external shaft or shaft seals, and the motor operating in the refrigerant is _________.
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Equipment sealed against the entrance of an external atmosphere where the seal is made by _____.
Equipment sealed against the entrance of an external atmosphere where the seal is made by _____.
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When one equipment must be within sight of another equipment it must be visible and not more than ______ feet from the other equipment.
When one equipment must be within sight of another equipment it must be visible and not more than ______ feet from the other equipment.
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An intersystem bonding termination is a device that provides a means for connecting a communication system bonding conductor to a _________.
An intersystem bonding termination is a device that provides a means for connecting a communication system bonding conductor to a _________.
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A luminaire may be a lamp holder.
A luminaire may be a lamp holder.
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According to the definition in the National Electrical Code, performing a function which requires human intervention is considered to be ________.
According to the definition in the National Electrical Code, performing a function which requires human intervention is considered to be ________.
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A device intended to provide limited overcurrent protection for specific applications and utilization equipment such as luminaires and appliances is ______.
A device intended to provide limited overcurrent protection for specific applications and utilization equipment such as luminaires and appliances is ______.
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A raceway is an enclosed channel designed expressly for holding ______.
A raceway is an enclosed channel designed expressly for holding ______.
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What is an electrical source that has no direct connection to circuit conductors of any other electrical source?
What is an electrical source that has no direct connection to circuit conductors of any other electrical source?
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The conductors between the service point and the first point of connection to the service-entrance conductors at the building or other structure are the ______.
The conductors between the service point and the first point of connection to the service-entrance conductors at the building or other structure are the ______.
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The underground conductors between the utility electric supply system and the service point are the service ________.
The underground conductors between the utility electric supply system and the service point are the service ________.
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Which of the following is an example of a simple apparatus?
Which of the following is an example of a simple apparatus?
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A power supply, which provides alternating current power to a load for some period of time in the event of a power failure is ____.
A power supply, which provides alternating current power to a load for some period of time in the event of a power failure is ____.
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Suitability of equipment may be evidenced by ______.
Suitability of equipment may be evidenced by ______.
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Equipment intended to interrupt current at fault levels shall have an interrupting rating _____ the nominal circuit voltage.
Equipment intended to interrupt current at fault levels shall have an interrupting rating _____ the nominal circuit voltage.
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For the mechanical execution of work, electrical equipment shall be installed in a ____.
For the mechanical execution of work, electrical equipment shall be installed in a ____.
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Where a metallic plug or plate is used to cover an unused opening in a nonmetallic enclosure, the plug or plate must be recessed at least ____ inch(es).
Where a metallic plug or plate is used to cover an unused opening in a nonmetallic enclosure, the plug or plate must be recessed at least ____ inch(es).
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Connectors and terminals for conductors more finely stranded than ____ stranding shall be identified for the specific conductor class or classes.
Connectors and terminals for conductors more finely stranded than ____ stranding shall be identified for the specific conductor class or classes.
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Parts of electrical equipment that in ordinary operation produce arcs, sparks, flames, or molten metal shall be ____.
Parts of electrical equipment that in ordinary operation produce arcs, sparks, flames, or molten metal shall be ____.
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A disconnecting means shall always be legibly marked to indicate its purpose.
A disconnecting means shall always be legibly marked to indicate its purpose.
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If a disconnecting means is required to be lockable, it shall be capable of being locked in the ____ position.
If a disconnecting means is required to be lockable, it shall be capable of being locked in the ____ position.
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The work space for electrical installations shall be clear and extend from the grade, floor, or platform to a height of ____.
The work space for electrical installations shall be clear and extend from the grade, floor, or platform to a height of ____.
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Live parts of electrical equipment operating at 50 to 300 volts shall be guarded against accidental contact by a minimum elevation of ____ above the floor or other working surface.
Live parts of electrical equipment operating at 50 to 300 volts shall be guarded against accidental contact by a minimum elevation of ____ above the floor or other working surface.
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A minimum clear cabling workspace ____ feet wide shall be provided in a manhole or other electrical enclosure intended for personnel entry where cables are located on both sides, and a minimum of 2 1⁄2 feet where cables are only on one side.
A minimum clear cabling workspace ____ feet wide shall be provided in a manhole or other electrical enclosure intended for personnel entry where cables are located on both sides, and a minimum of 2 1⁄2 feet where cables are only on one side.
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The workspace for electrical equipment in a manhole, vault or other enclosure designed for personnel entry with live parts operating at 1000 volts or less that require examination, adjustment, servicing or maintenance while energized shall comply with article ____.
The workspace for electrical equipment in a manhole, vault or other enclosure designed for personnel entry with live parts operating at 1000 volts or less that require examination, adjustment, servicing or maintenance while energized shall comply with article ____.
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Round access openings in a manhole shall be a minimum of ________- inches in diameter.
Round access openings in a manhole shall be a minimum of ________- inches in diameter.
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An insulated grounded conductor of 6 AWG or smaller shall be identified as ______.
An insulated grounded conductor of 6 AWG or smaller shall be identified as ______.
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The identification of terminals to which a grounded conductor is to be connected shall be substantially ______ in color.
The identification of terminals to which a grounded conductor is to be connected shall be substantially ______ in color.
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All conductors of a multiwire branch circuit shall originate from the same ______.
All conductors of a multiwire branch circuit shall originate from the same ______.
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At the point where a branch circuit originates, there shall be a means to simultaneously disconnect all _____ conductors.
At the point where a branch circuit originates, there shall be a means to simultaneously disconnect all _____ conductors.
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Each multiwire branch circuit must be provided with a disconnecting means that simultaneously disconnects all ____ conductors at the point of origin for the branch circuit.
Each multiwire branch circuit must be provided with a disconnecting means that simultaneously disconnects all ____ conductors at the point of origin for the branch circuit.
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A multiwire branch circuit shall supply only one line-to-neutral load.
A multiwire branch circuit shall supply only one line-to-neutral load.
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When a premises wiring system has ______ supplied from more than one nominal voltage system, a permanent label shall document the method utilized for identifying conductors by the phase or line and system.
When a premises wiring system has ______ supplied from more than one nominal voltage system, a permanent label shall document the method utilized for identifying conductors by the phase or line and system.
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When adding a different voltage system to an already existing installation, it shall not be necessary to document the existing unidentified system connections.
When adding a different voltage system to an already existing installation, it shall not be necessary to document the existing unidentified system connections.
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What color is usually used to identify the positive polarity conductor for a DC branch circuit of more than 60 volts when using 6 AWG or smaller conductors?
What color is usually used to identify the positive polarity conductor for a DC branch circuit of more than 60 volts when using 6 AWG or smaller conductors?
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For a dwelling unit or guest suite of a hotel, or similar occupancy, the voltage shall not be more than _____ volts between conductors that supply the terminals of luminaires.
For a dwelling unit or guest suite of a hotel, or similar occupancy, the voltage shall not be more than _____ volts between conductors that supply the terminals of luminaires.
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Branch circuits exceeding 120 volts but not exceeding 277 volts are permitted to supply all of the following except ______.
Branch circuits exceeding 120 volts but not exceeding 277 volts are permitted to supply all of the following except ______.
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If two or more branch circuits supply a device or piece of equipment on the same yoke, a means to simultaneously disconnect the ungrounded conductor supplying that device shall be provided where the branch circuit ______.
If two or more branch circuits supply a device or piece of equipment on the same yoke, a means to simultaneously disconnect the ungrounded conductor supplying that device shall be provided where the branch circuit ______.
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Ground-fault circuit protection is required in ____ for all 125-volt single-phase 13- and 20-ampere receptacles.
Ground-fault circuit protection is required in ____ for all 125-volt single-phase 13- and 20-ampere receptacles.
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Receptacles within ____ feet from the top inside edge of the bowl of a sink are required to be ground-fault circuit protected when not installed in a dwelling.
Receptacles within ____ feet from the top inside edge of the bowl of a sink are required to be ground-fault circuit protected when not installed in a dwelling.
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GFCI protection shall be provided for outlets not exceeding ____ volts that supply boat hoists installed in dwelling unit locations.
GFCI protection shall be provided for outlets not exceeding ____ volts that supply boat hoists installed in dwelling unit locations.
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A branch circuit supplied by an autotransformer shall be ____.
A branch circuit supplied by an autotransformer shall be ____.
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When a multiple switching device is used as a disconnecting means it shall ____.
When a multiple switching device is used as a disconnecting means it shall ____.
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The minimum number of branch circuits shall be determined from the _______.
The minimum number of branch circuits shall be determined from the _______.
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A branch circuit for a garage is permitted to supply all of the following except?
A branch circuit for a garage is permitted to supply all of the following except?
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All 120 volt, single phase, 15 and 20 ampere branch circuits supplying outlets installed in dwelling unit rooms or hallways shall be protected by ______ installed to provide protection of the branch circuit.
All 120 volt, single phase, 15 and 20 ampere branch circuits supplying outlets installed in dwelling unit rooms or hallways shall be protected by ______ installed to provide protection of the branch circuit.
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Which of the following is NOT a standard rating for an individual branch circuit?
Which of the following is NOT a standard rating for an individual branch circuit?
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The ____ branch circuit conductor size shall have an allowable ampacity not less than the maximum load to be served after the application of any adjustment or correction factors.
The ____ branch circuit conductor size shall have an allowable ampacity not less than the maximum load to be served after the application of any adjustment or correction factors.
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Branch-circuit conductors that supply loads other than those specified in 210.3 and other than cooking appliances as covered in 210.19(A)(3) shall have an ampacity sufficient for the loads served and shall not be smaller than ____ AWG.
Branch-circuit conductors that supply loads other than those specified in 210.3 and other than cooking appliances as covered in 210.19(A)(3) shall have an ampacity sufficient for the loads served and shall not be smaller than ____ AWG.
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If a branch circuit supplies continuous loads, the rating of the overcurrent device shall be a minimum of the non-continuous load plus ____ percent of the continuous load.
If a branch circuit supplies continuous loads, the rating of the overcurrent device shall be a minimum of the non-continuous load plus ____ percent of the continuous load.
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If connected to a branch circuit which has a rating in excess of ____ amperes, lampholders shall be the heavy-duty type.
If connected to a branch circuit which has a rating in excess of ____ amperes, lampholders shall be the heavy-duty type.
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What is the maximum permitted load for a receptacle rated 20 amperes on a 15 ampere branch circuit supplying two or more receptacles?
What is the maximum permitted load for a receptacle rated 20 amperes on a 15 ampere branch circuit supplying two or more receptacles?
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Study Notes
National Electrical Code Overview
- Not intended as a design specification or instruction manual, primarily aimed at ensuring safety.
- Excludes installation in underground mines from its scope.
- Chapter 8 specifically covers communications systems.
- Informational annexes are for informational purposes only.
Authority and Product Use
- If a new product required by the current code is unavailable, the authority having jurisdiction may allow the use of a product from the previous edition.
Electrical Safety and Inspection
- Permissive rules indicate actions allowed but not mandatory.
- Equipment listed by a qualified testing lab does not require inspection if unaltered and undamaged.
- Distribution centers should be located for convenience and safety.
Circuit and Wiring Standards
- Limits on circuits in enclosures help minimize ground faults or short circuits.
- Measurement units in the code use both inch-pound and SI units.
- Bonding establishes electrical conductivity and continuity.
Equipment and Devices
- An arc-fault circuit interrupter (AFCI) protects against arc faults by recognizing unique characteristics and de-energizing circuits.
- Askarel refers to a group of non-flammable synthetic chlorinated hydrocarbons used as electrical insulating materials.
- A hermetic refrigerant motor-compressor combines both compressor and motor in a single sealed housing.
Wiring Installations
- Accessible equipment means it is not guarded by elevation or locked doors.
- Equipment sealed against external atmosphere must be fused.
- A disconnecting means must be clearly marked for its purpose.
Installation Standards
- Workspaces for electrical installations must extend 6.5 feet high and be clear for access.
- Live parts operating at 50 to 300 volts require guarding against accidental contact, ideally elevated above 8 feet.
- Multiwire branch circuits must originate from the same panel board.
Ground Fault and Circuit Protection
- Ground-fault circuit protection is required for specific receptacles in bathrooms, garages, and outdoor areas.
- GFCI protection is also needed for outlets near sinks exceeding 6 feet in height.
Circuit Ratings and Load Management
- Circuit conductors must accommodate maximum load after adjustment factors.
- Minimum conductor size for general use cannot be smaller than 14 AWG.
- Maximum receptacle loads must align with branch circuit ratings to avoid overloading.
Receptacle Requirements
- Appliance receptacles must be installed within 6 feet of appliance locations.
- Receptacle outlet requirements detail spacing and installation heights, especially concerning islands and countertops.
Compliance and Documentation
- Equipment's suitability can be demonstrated through listing or labeling.
- Identification and documentation of circuit connections are required when different voltage systems coexist.
Important Definitions
- A feeder serves as the circuit conductors between the overcurrent device and outlets.
- A supplementary overcurrent protective device provides limited protection for specific applications.
- A raceway is designed to hold busbars, cables, or wires for protection and organization.### Electrical Outlet Guidelines
- Bed installations must avoid contact with any attachment plug using suitable guards.
- There is a requirement for one 125-volt receptacle outlet within 18 inches of the top of show windows for every 12 linear feet.
Servicing Equipment Requirements
- A 125-volt, single-phase receptacle outlet (15- or 20-ampere) must be accessible for servicing heating, air conditioning, and refrigeration equipment.
Electrical Service Area Specifications
- An indoor electrical service area must be accessible within 25 feet of the electrical service equipment.
Lighting Outlet Mandates
- At least one wall switch-controlled lighting outlet is necessary in every bathroom, habitual room, and kitchen.
- For interior stairways with six or more risers, each floor and landing level with entryways must have a wall switch for lighting outlets.
Lighting Requirements Near Equipment
- At least one lighting outlet must be installed near equipment requiring servicing located in attics, underfloors, utility rooms, or basements.
Feeder Circuit Specifications
- Minimum feeder-circuit conductor size must have an allowable ampacity of at least the noncontinuous load plus 125% of the continuous load.
- Grounded conductors, not connected to an overcurrent device, may be sized at 100% of the continuous and noncontinuous loads.
- Minimum feeder conductor size must have an allowable ampacity that is not less than the maximum load after applying any adjustment or correction factors.
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Test your knowledge with these flashcards based on the National Electrical Code for residential wireman. Each card covers key concepts and provisions essential for safety and construction standards. Perfect for preparation for the wireman test.
