eep March 18, 2025 NEC 100-110 NEC Quizzes Report a question What's wrong with this question? You cannot submit an empty report. Please add some details. 0% Article 100-110 Quiz02 This quiz includes 20 questions selected from NEC Articles 100 to 110. The questions are chosen randomly, with no repeats from other quizzes—unless a particular question is used again on purpose because it relates to more than one topic, such as both cable ampacity and cable application. If you spot any issues or have suggestions, you’re welcome to report questions or review the quiz. Your feedback matters, and contributions to help improve and refine the questions and quizzes are always appreciated. This definition includes multiple fixture types. 1 / 20 What is a "Bathroom" as defined in Article 100? a. Any room with a sink. b. A room containing only a toilet. c. A room with plumbing fixtures. d. An area including a sink with one or more of the following: a toilet, a urinal, a tub, a shower, or similar plumbing fixtures. Not quite. A bathroom must have a sink and additional fixtures. Correct! Bathrooms involve more than just a single fixture type. The NEC defines a bathroom as a space that combines a sink with additional plumbing fixtures. This device protects against overcurrent. 2 / 20 What is a "Circuit Breaker"? a. A device that controls voltage variations in a circuit. b. A device designed to open and close a circuit automatically or manually and to open the circuit automatically on overcurrent. c. A fuse used to protect electrical circuits. d. emergency Incorrect. Fuses are different from circuit breakers. Correct! Circuit breakers are both manual and automatic switches. Circuit breakers are essential for protecting electrical systems by interrupting overcurrent events. The interrupting rating must be sufficient to handle the maximum current the equipment may encounter without failure. 3 / 20 Equipment intended to interrupt current at other than fault levels shall have an interrupting rating at nominal circuit voltage _______________ the current that must be interrupted. a. At least equal to b. Matching c. At most, less than d. At least greater than The selected option does not comply with NEC requirements for interrupting ratings of current-interrupting equipment. Correct! The interrupting rating of equipment must be at least equal to the current that must be interrupted, as specified in NEC Article 110.9. According to NEC Article 110.9, equipment intended to interrupt current (such as switches and circuit breakers) must have an interrupting rating at least equal to the current it is required to interrupt. This ensures the equipment can safely handle the expected current without damage or failure. Focus on detecting and mitigating electrical arcs. 4 / 20 What is the primary function of an "Arc-Fault Circuit Interrupter (AFCI)"? a. To serve as a backup overcurrent device. b. To disconnect circuits during overcurrent conditions. c. To provide protection from the effects of arc faults by de-energizing the circuit when detected. d. To monitor voltage stability in high-power circuits. Incorrect. AFCIs address arcing, not overcurrent or voltage issues. Correct! AFCIs are crucial for reducing fire risks from electrical arcs. AFCIs are designed to protect against fire hazards caused by electrical arcs. Think about processes that don’t need human action. 5 / 20 How is "Automatic" defined in Article 100? a. A process triggered by external signals. b. A process triggered by external signals. c. A function requiring minimal human intervention. d. Performing a function without the necessity of human intervention. Incorrect. Automation excludes dependence on human input. Well done! Automation operates autonomously. Automatic systems function independently, responding to preset conditions without manual control. This involves the final section of a circuit. 6 / 20 What does "Branch Circuit" refer to? a. Conductors feeding a transformer. b. The circuit conductors between the final overcurrent device and the outlets. c. A circuit running between panels. d. The connection between a main panel and subpanel. Not quite. Remember, it's downstream of the overcurrent device. Correct! A branch circuit connects the final protection to outlets. A branch circuit supplies power from the last overcurrent protection device to connected outlets or equipment. This definition applies specifically to conductors used in overhead service installations. 7 / 20 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, is defined as what? a. Service Entrance Conductors (Overhead) b. Service Equipment c. Service Entrance Conductors (Underground) d. Service Drop The selected option does not match the NEC definition for service entrance conductors in overhead installations. Correct! These are defined as Service Entrance Conductors (Overhead), as specified in NEC Article 100. According to NEC Article 100, Service Entrance Conductors (Overhead) are the conductors that connect the terminals of the service equipment to a point usually outside the building, where they are joined by tap or splice to the service drop or overhead service conductors. This definition excludes underground installations. The minimum working distance is determined by the voltage and whether live or grounded parts are present on the opposite side of the workspace. 8 / 20 A 120-208V 3-phase panel with exposed live parts on one side, and no live or grounded parts on the other side of the working space, must have a minimum clear working distance of _______________ in front of the panel. a. 3 feet b. 4 feet c. 3 feet 6 inches d. 4 feet 6 inches The selected working distance does not meet NEC requirements for the specified conditions. Correct! The minimum clear working distance in front of a 120-208V 3-phase panel under these conditions is 3 feet, as specified in NEC Table 110.26(A)(1). According to NEC Table 110.26(A)(1), for electrical equipment operating at 120-208V with exposed live parts on one side and no live or grounded parts on the opposite side, the minimum working clearance is 3 feet. This ensures safe access for maintenance and operation. An attachment plug is commonly used to connect a flexible cord to a power source. 9 / 20 An attachment plug is a(n): a. A fitting intended to terminate a cord to a box or similar device and reduce the strain points of termination b. Device that, by insertion in a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle c. Device that controls AC/DC voltage or AC/DC current, or both, and is used to charge a battery or other energy storage device d. Device designed to open and close a circuit by nonautomatic means The selected option does not align with the NEC definition of an attachment plug. Correct! An attachment plug is a device that, by insertion in a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors connected permanently to the receptacle, as defined in NEC Article 100. According to NEC Article 100, an attachment plug is a device that, by insertion into a receptacle, establishes a connection between the conductors of the attached flexible cord and the conductors permanently connected to the receptacle. This is commonly used in cord-connected appliances and devices. Backup power is a key concept here. 10 / 20 What is an "Alternate Power Source"? a. A public utility service always running in parallel. b. One or more generator sets or battery systems intended to provide power during interruption of the normal electrical service. c. A combination of multiple energy sources for efficiency. d. A set of transformers used for backup power. Not quite. It’s about backup, not parallel systems. Absolutely! These systems are critical for maintaining operations during outages. Alternate Power Sources ensure continuity during power outages by providing energy from generators or batteries. This type of enclosure is designed for ease of access to the electrical components it houses. 11 / 20 A _______________ is an enclosure designed for surface mounting that has swinging doors or covers secured directly to and telescoping with the walls of the enclosure. a. Switchgear b. Panelboard c. Cabinet d. Cutout box The selected option does not match the NEC definition of a cutout box. Correct! A cutout box is an enclosure designed for surface mounting with swinging doors or covers, as specified in NEC Article 100. According to NEC Article 100, a cutout box is an enclosure designed for surface mounting that includes swinging doors or covers that are directly secured to and telescope with the walls of the enclosure. This design allows easy access to internal components. The AHJ oversees code compliance. 12 / 20 What is an "Authority Having Jurisdiction (AHJ)"? a. A federal agency responsible for all code enforcement. b. A federal agency responsible for all code enforcement. c. A licensed inspector hired for code compliance. d. A third-party testing agency. Incorrect. AHJs are not limited to federal agencies or specific roles. Correct! AHJs ensure adherence to codes and standards. The AHJ is typically a governing body or inspector tasked with ensuring installations meet safety standards. Duration is key here. 13 / 20 How is "Continuous Load" defined? a. A load that operates continuously but below maximum capacity. b. A load where the maximum current is expected to continue for 3 hours or more. c. A load that operates for less than 1 hour. d. A load with varying current requirements. Not quite. The NEC defines continuous loads as operating for 3 hours or more. Correct! Continuous load durations are crucial for proper system design. Continuous loads are characterized by sustained operation at maximum current for extended periods. It ensures electrical continuity. 14 / 20 What does "Bonded" mean? a. Shielded from electrical interferences. b. Grounded through a grounding electrode. c. Insulated to prevent conductivity. d. Connected to establish electrical continuity and conductivity. Incorrect. Bonding focuses on electrical connections, not grounding alone. Correct! Bonding ensures electrical continuity. Bonding ensures that all metal parts are at the same electrical potential to reduce shock hazards. Think about photovoltaic systems. 15 / 20 What is an "Array" as defined in Article 100? a. A configuration of transformers used for backup. b. A combination of power and control devices. c. A series of batteries connected in series. d. A mechanically and electrically integrated grouping of modules with support structure, including attached system components. Nope! This term does not apply to batteries or transformers. Right! Arrays combine modules into a functional unit. Arrays typically refer to configurations like those in solar power systems where modules and their supporting structures are integrated. This relates to ease of physical access for maintenance. 16 / 20 What does the term "Accessible" as applied to equipment mean? a. Capable of being reached for operation, renewal, and inspection without removing any part of the equipment. b. Capable of being reached only by trained professionals. c. Capable of being reached for operation, renewal, and inspection. d. Capable of being reached quickly without using tools. Incorrect. Remember, the definition does not specify speed or professional training requirements. Correct! Accessibility ensures that equipment can be maintained without significant effort. "Accessible" as applied to equipment refers to the capability to reach the equipment for tasks such as operation and inspection without significant barriers or specialized tools. This type of equipment directly consumes electric energy to perform its function. 17 / 20 _______________ equipment utilizes electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes. a. Cord-and-plug connected b. Signaling c. Heating d. Utilization The selected option does not align with the NEC definition of equipment that directly uses electrical energy. Correct! Utilization equipment is equipment that uses electric energy for electronic, electromechanical, chemical, heating, lighting, or similar purposes, as defined in NEC Article 100. According to NEC Article 100, utilization equipment is defined as equipment that uses electric energy for purposes such as electronic, electromechanical, chemical, heating, lighting, or similar functions. Examples include appliances, lighting fixtures, and heating systems. Approval requires jurisdictional consent. 18 / 20 What is the meaning of "Approved" in NEC terminology? a. Acceptable to the authority having jurisdiction. b. Listed in an NFPA standard. c. Verified by any professional inspector. d. Certified by the manufacturer. No, approval isn't about general certifications or standards. Correct! Approval must come from the AHJ. Approval in the NEC depends on the authority having jurisdiction (AHJ), which ensures compliance with safety standards. The clearance requirement increases when grounded parts are present opposite exposed live parts in the working space. 19 / 20 Exposed live parts on one side of the working space and grounded parts on the other side of the working space must have _______________ clearance in a 277-volt to ground. a. 3 feet 6 inches b. 3 feet c. 4 feet d. 2 feet 6 inches The selected clearance does not meet NEC requirements for this voltage and working space condition. Correct! The required working clearance for this scenario is 3 feet 6 inches, as specified in NEC Table 110.26(A)(1). According to NEC Table 110.26(A)(1), for electrical equipment with 277 volts to ground, and where exposed live parts are on one side and grounded parts (e.g., walls, panels) are on the other, the required minimum working clearance is 3 feet 6 inches. This ensures safe access and maintenance of the equipment. Ampacity involves continuous current limits. 20 / 20 What does "Ampacity" refer to? a. The maximum current, in amperes, that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. b. The minimum voltage a conductor can handle continuously. c. The resistance offered by a conductor at rated temperature. d. The short-circuit current a conductor can sustain. Incorrect. Ampacity focuses on current, not voltage or resistance. Correct! Ampacity defines a conductor's safe operating current. Ampacity is a critical value for ensuring conductors operate safely without overheating under specified conditions. 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