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 applies specifically to conductors used in overhead service installations. 1 / 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 Equipment b. Service Entrance Conductors (Underground) c. Service Entrance Conductors (Overhead) 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. Safety is a primary concern here. 2 / 20 What does "Dead-Front" mean in electrical equipment? a. Accessible only by qualified personnel. b. Enclosed with a protective barrier. c. Without live parts exposed to a person on the operating side. d. Insulated to prevent electrical shocks. Not quite. Dead-front relates to exposure to live parts. Correct! Dead-front protects operators from live components. Dead-front equipment ensures live parts are not exposed to individuals during operation. Approval requires jurisdictional consent. 3 / 20 What is the meaning of "Approved" in NEC terminology? a. Verified by any professional inspector. b. Listed in an NFPA standard. c. Certified by the manufacturer. d. Acceptable to the authority having jurisdiction. 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. This definition includes multiple fixture types. 4 / 20 What is a "Bathroom" as defined in Article 100? a. A room with plumbing fixtures. b. An area including a sink with one or more of the following: a toilet, a urinal, a tub, a shower, or similar plumbing fixtures. c. A room containing only a toilet. d. Any room with a sink. 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. The interrupting rating must be sufficient to handle the maximum current the equipment may encounter without failure. 5 / 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 greater than b. Matching c. At least equal to d. At most, less 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. It ensures electrical continuity. 6 / 20 What does "Bonded" mean? a. Connected to establish electrical continuity and conductivity. b. Shielded from electrical interferences. c. Grounded through a grounding electrode. d. Insulated to prevent 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. The clearance requirement increases when grounded parts are present opposite exposed live parts in the working space. 7 / 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. 2 feet 6 inches c. 4 feet d. 3 feet 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. Think about processes that don’t need human action. 8 / 20 How is "Automatic" defined in Article 100? a. Performing a function without the necessity of human intervention. b. A function requiring minimal human intervention. c. A process triggered by external signals. d. A process triggered by external signals. 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. 9 / 20 What does "Branch Circuit" refer to? a. Conductors feeding a transformer. b. A circuit running between panels. c. The circuit conductors between the final overcurrent device and the outlets. 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. The interrupting rating must be sufficient to handle the maximum current the equipment may encounter without failure. 10 / 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. Matching b. At least equal to c. At least greater than d. At most, less 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. The minimum working distance is determined by the voltage and whether live or grounded parts are present on the opposite side of the workspace. 11 / 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 6 inches c. 4 feet d. 3 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. 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 third-party testing agency. c. A licensed inspector hired for code compliance. d. A federal agency responsible for all code enforcement. 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. Think about photovoltaic systems. 13 / 20 What is an "Array" as defined in Article 100? a. A series of batteries connected in series. b. A mechanically and electrically integrated grouping of modules with support structure, including attached system components. c. A configuration of transformers used for backup. d. A combination of power and control devices. 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. The key is the device's capacity to handle overcurrent within its operational range, which starts from its specified rating. 14 / 20 A branch-circuit OCPD is a device capable of providing protection for service, feeder, and branch circuits and equipment over the full range of over-currents between its _______________ and its interrupting rating. a. Rated over-current rating b. Rated voltage c. Rated current d. Short-circuit The selected option does not describe the operational range of an OCPD as specified by NEC. Correct! A branch-circuit OCPD provides protection over the full range of overcurrents between its rated current and its interrupting rating, as defined in NEC Article 100. According to NEC Article 100, a branch-circuit overcurrent protective device (OCPD) provides protection over the range of overcurrents between its rated current (the maximum current it is designed to handle continuously) and its interrupting rating (the maximum current it can safely interrupt during a fault). This relates to ease of physical access for maintenance. 15 / 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 for operation, renewal, and inspection. c. Capable of being reached quickly without using tools. d. Capable of being reached only by trained professionals. 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. Backup power is a key concept here. 16 / 20 What is an "Alternate Power Source"? a. A combination of multiple energy sources for efficiency. b. A public utility service always running in parallel. c. A set of transformers used for backup power. d. One or more generator sets or battery systems intended to provide power during interruption of the normal electrical service. 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 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. Utilization b. Cord-and-plug connected c. Signaling d. Heating 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. Duration is key here. 18 / 20 How is "Continuous Load" defined? a. A load that operates for less than 1 hour. b. A load that operates continuously but below maximum capacity. c. A load where the maximum current is expected to continue for 3 hours or more. 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. For wide switchgear and control panels, the NEC mandates adequate access to ensure safety and compliance with clearance requirements. 19 / 20 On switchgear and control panels exceeding _______________ in width, there shall be one entrance at each end of the equipment. a. 6 feet b. 5 feet c. 4 1/2 feet d. 4 feet The selected width does not meet NEC requirements. Switchgear or control panels wider than 6 feet must have entrances at both ends, as per NEC Article 110.26(C)(2). Correct! For switchgear and control panels exceeding 6 feet in width, the NEC requires an entrance at each end of the equipment, as stated in NEC Article 110.26(C)(2). Requirement: For switchgear or control panels wider than 6 feet, entrances must be provided at each end to allow safe access for maintenance and emergency egress. This ensures compliance with workspace and accessibility standards. Panels less than 6 feet wide: Only one entrance is required. This device protects against overcurrent. 20 / 20 What is a "Circuit Breaker"? a. A device that controls voltage variations in a circuit. b. A fuse used to protect electrical circuits. c. emergency d. A device designed to open and close a circuit automatically or manually and to open the circuit automatically on overcurrent. 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. 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