National Electrical Code (NEC) Article 100 Practice Test

These questions are part of the practice quiz. Start practicing

• Which definition best fits "overcurrent protective devices"?
• Which of the following best describes a qualified person?
• What device is designed to provide limited overcurrent protection for specific equipment?
• In electrical terminology, what does the term "ground" refer to?
• A switchboard is primarily intended for which of the following?
• What does it mean if a conductor is described as concealed?
• Who is considered a qualified person in the context of electrical installations?
• What is the function of service conductors in an electrical system?
• What is the role of a thermal protector in a motor?
• Which term describes equipment designed to prevent moisture from entering its enclosure under certain conditions?
• What does "ampacity" refer to regarding a conductor?
• Which conductors extend from the service point to the service disconnecting means?
• How does a pressure connector operate?
• What does the term 'raceways' encompass?
• What is the main function of a raceway?
• What does "accessible equipment" refer to in terms of removal or exposure?
• What is an electric circuit that energizes signaling equipment called?
• What is the main characteristic of equipment classified as "appliances"?
• What is the purpose of a general-use switch in electrical installations?
• What do we call the overhead service conductors that connect to the service equipment terminals?
• What is a branch circuit that serves a single piece of utilization equipment called?
• What is the correct term for operation that alternates between load and no load conditions?
• Which of the following best defines an overhead service conductor?
• Which term describes an enclosure that prevents moisture from entering under specified test conditions?
• Which device provides limited overcurrent protection in addition to the branch circuit's overcurrent device?
• How is the voltage to ground measured in grounded circuits?
• What is the term for the service conductors from the service equipment to the underground service conductors?
• Which type of location includes installations in direct contact with the earth and is subject to saturation with water?
• What is the term for the conductors and equipment delivering electric energy from the utility to the premise's wiring system?
• What does Duty, Short-Time refer to?
• Which type of plug supplies a connection between flexible cords and receptacles?
• What term describes the conductors extending from the service point to the service disconnecting means?
• What type of enclosure is identified for use in underground systems that allows personnel to access equipment?
• What does it mean when an electrical enclosure is described as dusttight?
• What type of barriers can be utilized to guard electrical installations?
• What term describes the conductors and equipment for delivering electric energy from the serving utility to the premises wiring system?
• What type of branch circuit supplies two or more receptacles or outlets for lighting and appliances?
• What does 'raintight' mean in relation to electrical equipment?
• Which type of grounding method involves a direct connection to ground without resistance?
• What term applies to the act of disconnecting electrical circuits from their power sources?
• Which term refers to any equipment connected to a source of voltage?
• What is the primary purpose of weatherproof construction for electrical equipment?
• What is a key feature of a general-use snap switch?
• What term describes a device that establishes an electrical connection to the earth?
• What type of location is protected from weather but subject to moderate moisture?
• What is a building or portion of a building intended for keeping self-propelled vehicles?
• What is necessary to remove likelihood of approach or contact by persons to a point of danger?
• What encompasses the total components and subsystems converting solar energy into usable electrical energy?
• What term is used for locations that may be temporarily subject to moisture during construction?
• What type of switch is designed for installation in device boxes and is recognized by the Code?
• What type of circuit energizes signaling equipment?
• What is the significance of specifying test conditions for watertight enclosures?
• What defines "accessible wiring methods" concerning quick reachability?
• Which best describes a building according to electrical standards?
• What is a cooking appliance designed for mounting in or on a counter called?
• What does the term "Utilization Equipment" generally refer to?
• What is the effective difference of potential between any two conductors of a circuit called?
• What term is used for an accommodation that combines living, sleeping, and sanitary facilities within a compartment?
• What does "guarded" refer to in electrical installations?
• What distinguishes an isolating switch from other types of switches?
• What type of circuit controls another circuit through a relay?
• Which of the following describes a "feeder" in electrical distribution?
• Which of the following describes a circuit that has a voltage to ground?
• Which term describes the highest current at rated voltage that a device is intended to interrupt under standard test conditions?
• Which is a key characteristic of a branch circuit?
• What is the purpose of a plenum in an air distribution system?
• What type of equipment is designed to convey information or attract attention using electrically illuminated components?
• In ungrounded circuits, what is the voltage measurement taken between a given conductor and any other conductor called?
• What is the purpose of a supplementary overcurrent protective device?
• What does a covered conductor indicate in electrical operations?
• What is the definition of a branch circuit in electrical terminology?
• What happens when a motor experiences an overload condition?
• Which conductor is used to connect grounding electrodes to the grounding conductor in a wiring system?
• Which of the following describes 'Service Drop' accurately?
• Which term refers to electrical equipment that has a higher tolerance to moisture compared to standard enclosures?
• The total components that convert solar energy into electrical energy are classified as what?
• What does 'enclosed' imply in relation to electrical installations?
• What is required as written consent from the authority having jurisdiction?
• What type of device is used to connect load conductors to a power source in conjunction with a transfer switch?
• What is the purpose of 'Service Equipment' in electrical installations?
• What is the process that localizes an overcurrent condition to restrict outages to only the affected circuit or equipment?
• What is a switch rated in horsepower capable of interrupting?
• What term refers to something that is built or constructed?
• What is a premises wiring system whose power is derived from a source of electric energy or equipment other than a service?
• What does a GFCI device do when it detects current to ground exceeds acceptable values?
• What do you call the underground service conductors that connect the street main to the first point of connection in a building?
• What identifies the component necessary for disconnecting power to a building or designated area?
• What is a motor control center primarily designed for?
• What is the purpose of weatherproof construction in electrical equipment?
• Which location is defined as not normally subject to dampness or wetness?
• What is a distinguishing feature of askarel used in electrical applications?
• What type of device transfers load conductor connections from one power source to another?
• What type of switch is intended for use in general distribution and branch circuits?
• What is the purpose of a Ground Fault Circuit Interrupter (GFCI)?
• What defines a dwelling unit?
• Which type of outlet is intended for the direct connection of a lampholder or luminaire?
• What are 'Service-Entrance Conductors, Overhead System' primarily defined as?
• What encompasses all components that convert solar energy into electrical energy?
• What is the purpose of a multioutlet assembly?
• Which of the following best describes the purpose of bonding in electrical systems?
• Which of the following describes a circuit that is directly connected to the main service panel?
• What characteristic defines ventilated equipment?
• What is another term for a branch circuit that solely supplies an appliance?
• What is the significance of fencing or walls surrounding energized parts?
• Which type of equipment uses electric energy for various applications?
• What electrical component typically serves to connect power to multiple devices?
• What type of device is operated manually to connect load conductors to a power source?
• What distinguishes rainproof construction?
• What is the term for the point of connection between the utility's facilities and the premises wiring?
• What is a power outlet intended for?
• What is the main role of service conductors in electrical systems?
• Which term refers to the maximum amount of current a conductor can handle continuously?
• What does nonautomatic control imply in electrical terms?
• What does the term "identified" mean when applied to equipment?
• What is defined as the area including a tub, toilet, and shower?
• What type of conductor connects non-current-carrying parts of equipment to a grounding system?
• What term describes the effective difference of potential between conductors in a circuit?
• What characterizes "effectively grounded" according to electrical standards?
• Which condition must an enclosure meet to be classified as weatherproof?
• What term is used for spaces designed for the operation of elevators or dumbwaiters?
• What is a thermal protector's main function in a motor?
• What is the term for a load where the maximum current is expected to continue for 3 hours or more?
• What is the function of a grounded conductor in an electrical system?
• What does it mean if a device is described as "automatic"?
• What is the primary function of electrical equipment as defined in the NEC?
• Which device serves to govern the electric power delivered to the apparatus it is connected to?
• What is an overload in electrical equipment operation?
• What is referred to as the means by which the conductors of a circuit can be disconnected from their source of supply?
• Which of the following best describes a "load" in an electrical circuit?
• What do we call service conductors that are configured in the form of a cable?
• What is the purpose of a supplementary overcurrent protective device?
• What is the term for the permanent joining of metallic parts to form an electrically conductive path?
• In electrical systems, why is it crucial to understand the concept of voltage to ground?
• What is the definition of metal-enclosed power switchgear?
• How is a one-family dwelling described?
• What is a nominal voltage?
• What is the primary characteristic of Duty, Continuous?
• Which term describes operation at a substantially constant load for an indefinitely long period of time?
• Which term refers to the circuit conductors between the final overcurrent device protecting the circuit and the outlet(s)?
• What does ground-fault protection of equipment aim to do?
• What is the intent of providing ventilation for electrical equipment?
• What is the main purpose of a circuit breaker in an electrical system?
• Which term describes an accessory in a wiring system intended primarily for mechanical functions?
• What is the name of an enclosure designed for surface mounting with swinging doors or covers?
• What encompasses the definition of overcurrent in electrical terms?
• What should be understood about apparatus designed for environments with explosive gases or vapors?
• Which item is recognized as suitable for a specified purpose due to being periodically evaluated?
• What type of jumper ensures the required electrical conductivity between metal parts that need to be connected?
• A switch rated in horsepower capable of interrupting maximum overload current is referred to as what?
• Which type of branch circuit supplies energy to one or more outlets with no permanently connected luminaires?
• What term describes equipment that has been evaluated and marked by an organization with periodic inspections?
• How is a volatile flammable liquid classified?
• What device is typically installed at an outlet for connecting an attachment plug?
• What does 'voltage to ground' refer to in grounded circuits?
• What is the key characteristic of an insulated conductor?
• What is a panelboard primarily designed for?
• What is the term for energized conductive components?
• What does the term "watertight" imply regarding electrical enclosures?
• Which type of branch circuit supplies only one utilization equipment?
• What is the primary purpose of an enclosure in electrical installations?
• What term refers to conductors connecting from the service equipment to the first point of connection?
• What describes the service conductors in an underground system?
• Which characteristic is essential for an enclosure to be considered watertight?
• What characteristic is essential for labeling equipment as a sign in electrical terminology?
• What is defined as equipment enclosed with a means of sealing to prevent access to live parts?
• What is typically designated as the main control point and cutoff of the electrical supply?
• What defines a 'Service Point' in an electrical system?
• What is a manually operated device used for operating a transfer switch called?
• What defines explosion proof apparatus in electrical terms?
• Which term describes a conductor that has no electrical insulation?
• Which term is used to describe operation at loads that can vary widely over time?
• What term describes a structure that prevents accidental contact with energized parts?
• What is a conductor used to connect equipment to a grounding electrode known as?
• What kind of rated voltage do devices interrupt under standard test conditions defined by interrupting rating?
• What is the function of a switch that has no interrupting rating and is operated after a circuit has been opened?
• What is the connection between the grounded circuit conductor and the equipment grounding conductor at the service called?
• What type of location is characterized by moderate degrees of moisture but protected from weather?
• What term refers to the overhead service conductors from the last pole to the service entrance at a building?
• What is indicated by the term "outlet" in electrical wiring?
• What is defined as a unit of an electrical system that carries or controls electric energy?
• What type of building consists solely of two dwelling units?
• What would be a characteristic of enclosures designed for outdoor use?
• Which device specifically protects a motor against overheating?
• What is the term for a string of outdoor lights suspended between two points?
• Which term describes all circuit conductors between service equipment and the final branch-circuit overcurrent device?
• What describes a premises wiring system that does not have a direct electrical connection to other supply conductors?
• What is the main characteristic of a switch intended for use in general distribution?
• What characteristic is essential for ventilated equipment?
• What does power outlet installations primarily support?
• What term refers to a complete lighting unit that includes a light source mounted and connected to a power supply?
• What is an essential feature of all raceways according to the Code?
• What describes the connection between the grounded circuit conductor and the equipment grounding conductor at a separately derived system?
• In what context would you find the term 'service lateral' used?
• What is a written consent from the authority having jurisdiction known as?
• What is the term for a window designed for displaying goods or advertising material?
• Which term refers to a nominal value assigned to a circuit for designating its voltage class?
• What differentiates a remote-control circuit from other types of circuits?
• What defines a receptacle outlet?
• In electrical terminology, what does ‘exposed’ mean regarding wiring methods?
• Which term refers to an area where electrical equipment is not exposed to saturation with water?
• A guest accommodation with two or more interconnected rooms is referred to as what?
• What is the demand factor in an electrical system?
• What type of service conductors are made up in the form of a cable?
• In terms of electrical operation, what is the definition of Duty, Periodic?
• What does the term 'Service Drop' refer to?
• Which term indicates intermittent operation where load conditions are regularly recurrent?
• What term refers to equipment that is constructed or protected so that weather exposure does not affect its operation?
• What does premises wiring include?
• What term refers to something that has been built or constructed?
• Which term best describes operation involving both load and rest conditions in a set pattern?
• Which device is used to open and close a circuit automatically in response to overcurrent?
• When referring to ungrounded circuits, what does the highest voltage between two conductors indicate?
• What is meant by "isolated" in the context of electrical installations?
• Which term describes any vertical opening or space where an elevator or dumbwaiter operates?
• What does 'externally operable' mean in relation to electrical equipment?
• A building that allows for complete independent living facilities for one or more persons is known as what?
• Which type of bonding jumper connects different grounding conductors at the main service?
• What is the primary purpose of a cabinet in electrical installations?
• What type of building is specifically designed for vehicle storage and maintenance?
• What defines a nonlinear load in an electrical system?
• What is the primary purpose of a switchboard?
• What is an outlet that contains one or more receptacles called?
• In a wiring system, which component is used to connect multiple grounding electrodes?
• Which of the following best describes "readily accessible"?
• What role does an "authority having jurisdiction" (AHJ) fulfill?
• What does it mean if parts are described as ‘exposed’ in an electrical context?
• What does it mean if a piece of equipment has a "dead front"?
• In what way is a switchboard typically accessed?
• What type of window is used or designed for displaying goods or advertising material?
• What do you call the connection between two or more portions of the equipment grounding conductor?
• What does the term "Thermally Protected" indicate on a motor nameplate?
• What term describes a circuit that specifically energizes signaling equipment?
• What is a characteristic of a Class II combustible liquid?
• What type of conductors are drawn from a copper-clad aluminum rod with a copper-bonded core?
• What is a receptacle designed for?
• Which of the following describes a multifamily dwelling?
• Which electrical term refers to a structure with all openings equipped with fire doors?
• What is meant by 'Service Lateral' in electrical terminology?
• What is the purpose of a receptacle in electrical systems?
• What type of switch is specifically manufactured for general-use applications?
• What can be included in a panelboard?
• What type of switch allows safe operation of electrical equipment by isolating the power source?
• What is defined as the voltage between a given conductor and a grounded point in grounded circuits?
• What is a switch rated for use in general distribution and branch circuits called?
• What type of switch is intended for isolating an electric circuit from the power source?
• Which construction type ensures that exposure to beating rain will not allow water to enter?
• What defines a "locknut" in electrical components?
• What is a switchboard in electrical terms?
• What does raintight construction ensure?
• What is an "appliance" in the context of utilization equipment?
• What is the definition of equipment or materials marked by an organization acceptable to the authority having jurisdiction?
• What type of equipment is designed with a means of sealing or locking to prevent access to live parts?
• What does outline lighting primarily do?
• What consists of circuit breakers, switches, and fuses connected to the load end of service conductors?
• What is "askarel" used for in electrical applications?
• What does it mean for a conductor when it is referred to as covered?
• What does 'energized' specifically refer to in electrical terminology?
• Which of the following describes a volatile flammable liquid?
• Which of the following describes a characteristic of both watertight and weatherproof constructions?
• What is the term for an electrical circuit that controls another circuit through a relay or similar device?
• What describes the path for electrical energy from one point to another within a building?
• What does the term "grounded" refer to in electrical terms?
• What does it mean for equipment to be classified as "approved"?
• What type of connection is made for grounding equipment to prevent voltage buildup?
• What does "Thermally Protected" indicate on a motor nameplate?
• What defines a "circuit" in an electrical system?
• What is the function of a conduit body in an electrical system?
• What type of equipment is designed to prevent the entrance of moisture under specified conditions?
• What qualifies as utilization equipment in electrical terms?
• Which system involves the overhead delivery of electric energy?
• What is the function of a transfer switch?
• Which term refers to a conducting connection between an electrical circuit and earth?