eep March 19, 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 Quiz03 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. Consider the importance of matching interrupting ratings to fault current levels for safety and equipment protection. 1 / 25 Equipment intended to interrupt current at fault levels shall have an interrupting rating at nominal circuit voltage at least equal to the current that is available at the line terminals of the equipment. a. False b. True Incorrect. The correct answer is True. Equipment designed to interrupt fault currents must have an interrupting rating equal to or greater than the available fault current at its line terminals. Correct! It is True that equipment intended to interrupt current at fault levels must have an interrupting rating at nominal circuit voltage that is at least equal to the available fault current at the line terminals, as stated in NEC Article 110.9. According to NEC Article 110.9, it is True that equipment intended to interrupt current at fault levels must have an interrupting rating at nominal circuit voltage that is at least equal to the fault current available at the line terminals of the equipment. Think about how receptacles are mounted and what distinguishes a single receptacle from other types. 2 / 25 A single receptacle is a single contact device with no other contact device on the same _____. a. circuit b. equipment c. yoke d. run Incorrect. The correct answer is yoke. A single receptacle is defined as a contact device mounted independently on a yoke without any other devices. Correct! A single receptacle is a single contact device with no other contact devices on the same yoke, as defined in NEC Article 100. According to NEC Article 100, a single receptacle is defined as a single contact device that has no other contact devices mounted on the same yoke. Consider the different types of equipment that are subject to labeling requirements for fault current. 3 / 25 ____ at other than dwelling units shall be legibly field marked with the maximum available fault current, include the date the fault current calculation was performed, and be of sufficient durability to withstand the environment involved. a. Service equipment b. Motor control centers c. Sub panels d. All of these Incorrect. The correct answer is Service equipment. This type of equipment has specific labeling requirements regarding fault current. Correct! Service equipment at locations other than dwelling units must be legibly marked with the maximum available fault current, as specified in NEC Article 110.24. According to NEC Article 110.24, service equipment at locations other than dwelling units must be legibly marked with the maximum available fault current, include the date of the calculation, and be durable enough to withstand the environmental conditions. Think about the necessary access required for safely servicing and maintaining electrical equipment. 4 / 25 Where equipment operating at 1,000 volts, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized is required by installation instructions or function to be located in a space with limited access, all enclosure doors or hinged panels shall be capable of opening a minimum of _____ degrees. a. 180 b. 60 c. 120 d. 90 Incorrect. The correct answer is 90 degrees. This requirement ensures that there is adequate access to the equipment for safe operation and maintenance. Correct! All enclosure doors or hinged panels must be capable of opening a minimum of 90 degrees, as specified in NEC Article 110.26(C)(2). According to NEC Article 110.26(C)(2), enclosure doors or hinged panels on equipment operating at 1,000 volts or less must be capable of opening a minimum of 90 degrees to facilitate safe access for maintenance and servicing. Think about the component in a grounding system that physically connects to the earth. 5 / 25 A _______________ is a conducting object through which a direct connection to earth is established. a. Grounded conductor b. Ground bus bar c. Grounding electrode d. Equipment grounding electrode conductor The selected option does not align with the NEC definition of a component that establishes a direct connection to the earth. Correct! A grounding electrode is a conducting object that establishes a direct connection to the earth, as defined in NEC Article 100. According to NEC Article 100, a grounding electrode is a conducting object, such as a ground rod or a metal water pipe, that establishes a direct connection to the earth. This provides a path for fault currents and helps stabilize voltage levels in the electrical system. Consider the different types of protection needed for electrical equipment installed outdoors. 6 / 25 All switchboards, switchgear, panelboards, and motor control centers shall be located in dedicated spaces and protected from damage, and outdoor installations shall be _____. a. installed in identified enclosure b. protected from accidental spillage or leakage from piping systems c. protected from accidental contact by unauthorized personnel or vehicular traffic d. all of these Incorrect. The correct answer is all of these. Outdoor installations must be protected from various hazards to ensure safety and compliance. Correct! All switchboards, switchgear, panelboards, and motor control centers installed outdoors must be protected from damage, and they should be protected from accidental contact, installed in identified enclosures, and shielded from spillage or leakage, as specified in NEC Article 110.31. According to NEC Article 110.31, outdoor installations of switchboards, switchgear, panelboards, and motor control centers must be protected from various hazards, which includes being installed in identified enclosures, protected from accidental contact by unauthorized personnel or vehicular traffic, and protected from accidental spillage or leakage from piping systems—thus, the correct answer is all of these. Think about the environments where electrical equipment is commonly found and the need for adequate lighting for safety. 7 / 25 Illumination shall be provided for all working spaces about service equipment, switchboards, switchgear, panelboards, or motor control centers _____. a. using automatic means of control b. rated 1,200A or more c. over 600V d. installed indoors Incorrect. The correct answer is installed indoors. This specifies that indoor working spaces require adequate illumination for safety and accessibility. Correct! Illumination shall be provided for all working spaces about service equipment, switchboards, switchgear, panelboards, or motor control centers installed indoors, as specified in NEC Article 110.26. According to NEC Article 110.26, illumination must be provided for all working spaces about service equipment, switchboards, switchgear, panelboards, or motor control centers that are installed indoors. Consider the standards that define what is considered acceptable in terms of labeling and safety practices. 8 / 25 Service equipment labeling other than in dwelling units shall not be required if an arc-flash label is applied in accordance with _____ industry practice. a. routine b. documented c. none of these d. acceptable Incorrect. The correct answer is acceptable. Service equipment labeling is exempt if an arc-flash label meets acceptable industry practices. Correct! Service equipment labeling other than in dwelling units is not required if an arc-flash label is applied in accordance with acceptable industry practice, as stated in NEC Article 110.16. According to NEC Article 110.16, service equipment labeling is not required for installations other than dwelling units if an arc-flash label is applied in accordance with acceptable industry practice. Consider the importance of clearly identifying all electrical systems to ensure safety and avoid confusion. 9 / 25 In existing installations where a voltage system already exists and a different voltage system is being added, it shall be permissible to mark only the old system voltage. a. False b. True Incorrect. The correct answer is False. All voltage systems should be clearly marked to prevent any safety hazards. Correct! It is False that only the old system voltage can be marked when a different voltage system is added; all systems must be properly identified as required by NEC Article 110.21. According to NEC Article 110.21, it is False that it is permissible to mark only the old system voltage when a different voltage system is added. All voltage systems in a facility must be properly marked to ensure safety and compliance. Think about the purpose and design of raceways in electrical installations. 10 / 25 A “raceway” is an enclosed channel designed expressly for the hold of wires, cables, or busbars, with additional functions as permitted in the code. a. False b. True Incorrect. The correct answer is True. A raceway is indeed defined as an enclosed channel designed for holding electrical conductors and may serve additional functions. Correct! It is True that a “raceway” is an enclosed channel designed expressly for holding wires, cables, or busbars, with additional functions as permitted in the NEC. According to NEC Article 100, it is True that a “raceway” is defined as an enclosed channel designed expressly for holding wires, cables, or busbars, with additional functions as permitted in the code. Consider the minimum voltage threshold established by the NEC for appliances to ensure they are compliant and safe for use. 11 / 25 All appliances operating at ______ or more shall be listed. a. 60V b. 30V c. 50V d. 20V That’s not correct. Remember, the NEC specifies a minimum voltage for appliances that must be listed for safety and compliance. Correct! All appliances operating at 50V or more must be listed to meet NEC requirements. Great job! According to NEC Article 110.3(B), all appliances operating at 50V or more must be listed. This requirement ensures that appliances have been tested and meet safety and performance standards, providing confidence in their use. The NEC mandates a specific color for identifying the high-leg conductor to ensure safety and standardization. 12 / 25 High-Leg marking shall be durably and permanently marked by an outer finish that is _______________ in color. a. Orange b. White c. Yellow d. Purple According to NEC Article 110.15, the high-leg of a 4-wire, delta-connected system must be durably and permanently marked with an outer finish that is orange in color. This marking ensures proper identification and prevents misconnection. Correct! High-leg marking must be orange, as specified in NEC Article 110.15. According to NEC Article 110.15, the high-leg of a 4-wire, delta-connected system must be durably and permanently marked with an outer finish that is orange in color. This marking ensures proper identification and prevents misconnection. Consider the standard sizes for access openings that allow for safe maintenance of electrical equipment. 13 / 25 Where equipment operating at 1,000 volts, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized is required by installation instructions or function to be located in a space with limited access, and where equipment is installed above a lay-in ceiling, there shall be an opening not smaller than _____. a. 22 in. x 30 in. b. 6 in. x 6 in. c. 22 in. x 22 in d. 12 in. x 12 in. Incorrect. The correct answer is 22 in. x 22 in. This size is required for access openings in spaces with limited access for maintenance of electrical equipment. Correct! There must be an access opening not smaller than 22 in. x 22 in. for equipment operating at 1,000 volts or less, as specified in NEC Article 110.26(C)(3). According to NEC Article 110.26(C)(3), for equipment operating at 1,000 volts or less that requires maintenance while energized and is located above a lay-in ceiling, there must be an access opening not smaller than 22 in. x 22 in. Consider the minimum requirement to ensure that the equipment can safely interrupt fault currents without damage. 14 / 25 Equipment intended to interrupt current at fault levels must have an interrupting rating at nominal circuit voltage that is ______________ the current available at the line terminals of the equipment. a. Less than b. Ten times c. More than d. At least equal to The selected option does not meet the NEC standard for interrupting ratings, which must be at least equal to the available fault current. Correct! The interrupting rating of the equipment must be at least equal to the available fault current at its line terminals, as per NEC Article 110.9. According to NEC Article 110.9, equipment designed to interrupt fault current must have an interrupting rating that is at least equal to the fault current available at the line terminals. This ensures the equipment can handle the fault conditions without failing. Think about the specific environmental conditions that can impact construction sites and equipment. 15 / 25 When protecting equipment against damage from the weather during construction, minimum _____ provisions provided in NFPA 5000 Building Construction and Safety Code, the International Building Code (IBC), and the International Residential Code for One and Two Family Dwellings (IRC) can be referenced for additional information. a. weather b. flood c. safety d. none of these Incorrect. The correct answer is weather. This term refers to provisions related to environmental protection that are relevant during construction. Correct! When protecting equipment against damage from the weather during construction, minimum weather provisions from NFPA 5000, the IBC, and the IRC can be referenced for additional information. According to NEC Article 110.11, when protecting equipment from weather-related damage during construction, minimum weather provisions from codes like NFPA 5000, IBC, and IRC can be referenced for further guidance. Consider which section addresses the requirements for working clearances specifically for equipment located outdoors. 16 / 25 All switchboards, switchgear, panelboards, and motor control centers shall be located in dedicated spaces and protected from damage, and the working clearance space for outdoor installations shall include the zone described in _____. a. 110.26(B) b. 110.26(A) c. 110.26(C) d. 110.26(D) Incorrect. The correct answer is 110.26(D). This section specifically addresses the working clearance space requirements for outdoor installations. Correct! The working clearance space for outdoor installations shall include the zone described in 110.26(D), as specified in the NEC. According to NEC Article 110.26(D), the working clearance space for outdoor installations must include the zones as described in this section, ensuring adequate access and safety around electrical equipment. The NEC specifies minimum dimensions to ensure adequate working space for safety and maintenance. 17 / 25 The width of working space in front of electrical equipment shall be the width of the equipment or _______________ inches, whichever is greater. a. 48 b. 30 c. 42 d. 36 The selected width does not meet NEC requirements for the minimum working space in front of electrical equipment. Correct! The width of the working space in front of electrical equipment must be at least 30 inches or the width of the equipment, whichever is greater, as specified in NEC Article 110.26(A)(2). According to NEC Article 110.26(A)(2), the width of the working space in front of electrical equipment must be at least 30 inches or the width of the equipment, whichever is greater. This provides sufficient room for safe operation and maintenance. Consider the common terminology used for devices that facilitate connections to electrical systems. 18 / 25 A contact device installed at an outlet for the connection of an attachment plug, or for the direct connection of electrical utilization equipment designed to mate with the corresponding contact device, is known as a(n) “_____.” a. tap b. attachment point c. receptacle d. wall plug Incorrect. The correct answer is receptacle. This term refers to the contact device used for connecting attachment plugs or electrical equipment at an outlet. Correct! A contact device for connecting an attachment plug or directly connecting electrical utilization equipment is referred to as a “receptacle,” as defined in NEC Article 100. According to NEC Article 100, a contact device installed at an outlet for connecting an attachment plug or for the direct connection of electrical equipment is known as a “receptacle.” Focus on enclosure types specifically designed to provide protection against wind-blown dust. 19 / 25 Which outdoor enclosure types are all approved for wind-blown dust applications? a. 3R, 3S, 3RX b. 3, 3S, 3RX c. 3SX, 3R d. 3S, 3X, 3SX The selected combination does not include all enclosure types specifically approved for wind-blown dust applications. The outdoor enclosure types 3S, 3X, and 3SX are all approved for wind-blown dust applications. According to NEMA Enclosure Type Definitions, the following enclosure types are approved for wind-blown dust applications: Type 3S: Protects against falling rain, sleet, snow, and wind-blown dust, with operable parts remaining functional. Type 3X: Adds corrosion resistance to the Type 3 protection for wind-blown dust and other conditions. Type 3SX: Combines the features of 3S and 3X for both functionality in dust-prone environments and corrosion resistance. Consider the importance of maintaining safe working conditions around electrical equipment. 20 / 25 Where equipment operating at 1,000 volts, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized is required by installation instructions or function to be located in a space with limited access, the space in front of the enclosure shall comply with the depth requirements of Table 110.26(A)(1). a. True b. False Incorrect. The correct answer is True. The space in front of the enclosure must meet the depth requirements outlined in the NEC. Correct! It is True that the space in front of the enclosure must comply with the depth requirements of Table 110.26(A)(1), as specified in NEC Article 110.26(A). According to NEC Article 110.26(A), it is True that the space in front of an enclosure for equipment operating at 1,000 volts or less must comply with the depth requirements specified in Table 110.26(A)(1). Think about the precision required in electrical installations and the tools that are necessary to meet those specifications. 21 / 25 Where a tightening torque is indicated as a numeric value on equipment or in installation instructions provided by the manufacturer, a(n) _____ torque tool shall be used to achieve the indicated torque value, unless the equipment manufacturer has provided installation instructions for an alternative method of achieving the required torque. a. identified b. listed c. calibrated d. adjustable Incorrect. The correct answer is calibrated. A calibrated torque tool ensures the specified torque values are achieved accurately during installation. Correct! Where a tightening torque is indicated, a calibrated torque tool must be used to achieve the specified torque value, as per NEC Article 110.3(B). According to NEC Article 110.3(B), when a tightening torque is specified, a calibrated torque tool should be used to achieve the indicated torque value unless alternative instructions are provided by the manufacturer. Consider how the NEC differentiates between various terms related to construction and equipment. 22 / 25 A “structure” is that which is built or constructed, other than equipment. a. True b. False Incorrect. The correct answer is True. A “structure” is defined as anything built or constructed, apart from equipment. Correct! It is True that a “structure” is defined as that which is built or constructed, other than equipment, according to NEC Article 100. According to NEC Article 100, it is True that a “structure” refers to anything that is built or constructed, excluding equipment. Consider the safety requirements for access to electrical equipment and how they relate to working space dimensions. 23 / 25 Where equipment operating at 1,000 volts, nominal, or less to ground and likely to require examination, adjustment, servicing, or maintenance while energized is required by installation instructions or function to be located in a space with limited access, the width of the working space shall be the width of the equipment enclosure or a minimum of _____ in., whichever is greater. a. 26 b. 12 c. 22 d. 30 Incorrect. The correct answer is 30. This width is required to ensure sufficient working space around electrical equipment. Correct! The minimum width of the working space shall be 30 inches or the width of the equipment enclosure, as specified in NEC Article 110.26(A)(1). According to NEC Article 110.26(A)(1), for equipment operating at 1,000 volts or less, the width of the working space must be at least 30 inches or the width of the equipment enclosure, whichever is greater, to ensure safe access for maintenance. Think about how warnings are typically conveyed for clarity and effectiveness. 24 / 25 Where caution, warning, or danger signs or labels are required by this code, the label marking shall warn of the hazards using effective _____. a. colors b. symbols c. any combination of words, colors, or symbols d. words Incorrect. The correct answer is any combination of words, colors, or symbols. This ensures that hazards are communicated effectively. Correct! Labels required for caution, warning, or danger must use any combination of words, colors, or symbols to effectively warn of hazards, as specified in NEC Article 110.21. According to NEC Article 110.21, where caution, warning, or danger signs or labels are required, the marking must warn of hazards using effective any combination of words, colors, or symbols. Consider the significance of labeling for safety in high-current installations. 25 / 25 In other than dwelling units, in addition to requirements for field or factory marking of equipment to warn qualified persons of potential electric arc-flash hazards, a permanent label shall be field or factory applied to service equipment rated _____ or more. a. 1,200A b. 1,600A c. 1,000A d. 600A Incorrect. The correct answer is 1,200A. A permanent label for arc-flash hazards is required for service equipment with a rating of this amperage or higher. Correct! A permanent label indicating potential electric arc-flash hazards must be applied to service equipment rated 1,200A or more, as specified in NEC Article 110.16. According to NEC Article 110.16, in installations other than dwelling units, a permanent label indicating electric arc-flash hazards must be applied to service equipment rated 1,200A or more. Your score is LinkedIn Facebook Twitter 0% Restart quiz Exit Rate & Review Thank you for taking the time to leave us a review! Your feedback is greatly appreciated and helps us improve our services. Send feedback Leave a Reply Cancel replyYour email address will not be published. Required fields are marked * Comment* Name* Email* Website Save my name, email, and website in this browser for the next time I comment. Post Comment
