eep April 7, 2025 NEC 200-285 NEC Quizzes Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% Article 200-285 Part02 This comprehensive quiz contains 50 questions carefully selected from the National Electrical Code (NEC) Articles spanning 200 through 285. These articles cover a broad spectrum of vital topics related to electrical installations within this section of the code. The questions in this quiz are chosen randomly to provide a thorough assessment of your knowledge across these essential NEC articles. While we strive for a diverse set of questions, some fundamental principles may be revisited in different contexts due to their relevance to multiple sections within this range. This approach ensures a robust evaluation of your understanding. We encourage you to actively participate and provide feedback. If you identify any issues or have suggestions for improving the quiz questions, please report them. Your contributions are invaluable in helping us maintain the accuracy and effectiveness of these learning resources. Surge protection is crucial for sensitive equipment in dwellings. 1 / 50 What does Article 215.18 require for feeders supplying dwelling units? a. Voltage drop limited to 1%. b. Installation of surge-protective devices (SPDs). c. Separate branch circuit breakers. d. Dedicated grounding electrodes. Incorrect. SPDs are required for feeders supplying dwelling units. Correct! SPDs ensure protection against surges in residential systems. SPDs protect electrical systems from voltage surges caused by lightning or utility events. Every ungrounded conductor needs specific protection. 2 / 50 What type of overcurrent protection is required for each ungrounded service conductor per 230.90(A)? a. Overcurrent protection based on utility specifications. b. Overcurrent protection is not required for service conductors. c. An overcurrent device rated at or below the conductor ampacity. d. Overcurrent devices only for grounded conductors. Incorrect. NEC requires specific overcurrent protection for ungrounded conductors. Correct! Overcurrent devices are mandatory and must match conductor ampacity. Each ungrounded service conductor must have overload protection to prevent overheating and damage. Think about pedestrian safety under overhead conductors. 3 / 50 . What minimum clearance is required for overhead service conductors above sidewalks accessible to pedestrians per 230.24(B)? a. 10 feet. b. No clearance required. c. 12 feet. d. 8 feet. Incorrect. The clearance for pedestrian areas is 10 feet. Correct! The clearance is 10 feet for sidewalks accessible to pedestrians. Overhead conductors must be at least 10 feet above sidewalks to prevent accidental contact Emergency disconnects are optional for dwellings. 4 / 50 What is the purpose of emergency disconnects for one- and two-family dwellings per 230.85? a. Emergency disconnects are optional for dwellings. b. To disconnect all feeders in a building. c. To provide first responders with a safe way to remove power. d. To serve as the main disconnect for service conductors. Incorrect. Emergency disconnects are specifically for first responders. Correct! Emergency disconnects ensure safety for emergency personnel. Emergency disconnects allow first responders to safely cut power to a dwelling in urgent situations. Specific wiring methods are required for outdoor circuits. 5 / 50 How must outdoor wiring be attached to buildings per 225.10? a. Only with metal clamps. b. Using approved methods such as EMT, RMC, or LFMC. c. Conduit is not required for outdoor wiring. d. With any non-metallic fasteners. Incorrect. Outdoor wiring must comply with approved methods like EMT or LFMC. Correct! Approved methods ensure safety and durability. Approved wiring methods ensure outdoor wiring is safely attached to buildings or structures. Marking identifies compliance for service equipment. 6 / 50 How must service equipment be marked per 230.66(A)? a. “Suitable for Use as Service Equipment” (SUSE). b. "Rated for voltages above 1000 volts." c. "For residential use only." d. No marking is required if approved by the utility. Incorrect. NEC requires the SUSE marking for compliance. Correct! The SUSE marking ensures suitability for service use. The SUSE marking indicates that equipment meets NEC standards for service applications. Protection from damage or contact defines “outside the building.” 7 / 50 What is required for conductors considered “outside the building” per 230.6? a. Protected by GFCI devices. b. Encased in 2 inches of concrete, buried 18 inches underground, or installed in vaults. c. Always insulated for the highest system voltage. d. Installed with 2 feet of clearance from all structures. Incorrect. Only certain methods qualify conductors as “outside the building.” Correct! Encasing or burying the conductors meets NEC requirements. Specific installations, such as burial or encasement, ensure conductors are considered outside the building. Exterior raceways are exposed to weather and temperature changes. 8 / 50 How must raceways on exterior surfaces of buildings be arranged (225.22)? a. Installed with sealed ends only. b. Arranged to allow for proper drainage. c. No special arrangement is required. d. Horizontal runs only. Incorrect. Proper drainage is essential for exterior raceways. Correct! Raceways must allow moisture to drain effectively. Raceways must drain to prevent water accumulation, which could lead to equipment damage or failure. Track lighting has a specific calculation method. 9 / 50 How are track lighting loads calculated per 220.46(B)? a. Using the wattage of installed luminaires. b. Based on the total length of the track. c. 200 VA per track section. d. 150 VA per 2 feet of track. Incorrect. Track lighting is calculated by length. Correct! 150 VA per 2 feet of track is the standard calculation. Track lighting is calculated at 150 VA for every 2 feet of installed track or fraction thereof. Accessibility to openings influences clearance requirements. 10 / 50 What clearance is required for service entrance cables attached to buildings per 230.9? a. 2 feet from all openings. b. At least 1 foot from windows. c. No specific clearance requirements. d. 3 feet from doors, balconies, or windows that can be opened. Incorrect. The required clearance is 3 feet from specific openings. Correct! The clearance ensures safety near openings. A 3-foot clearance prevents accidental contact with service entrance cables. Small-appliance circuits have a standardized load value. 11 / 50 What is the minimum load for small-appliance circuits in dwelling units (220.52(A))? a. 1200 VA per circuit. b. 1500 VA per 2-wire circuit. c. Calculated at 50% of the connected load. d. Based on the appliance nameplate rating. Incorrect. The NEC specifies a minimum of 1500 VA per circuit. Correct! Small-appliance circuits are calculated at 1500 VA each. Each small-appliance circuit is calculated at 1500 VA regardless of actual usage. Splicing requires specific, listed methods. 12 / 50 What method is allowed for splicing service entrance conductors per 230.46? a. Only welded connections. b. Any method approved by the installer. c. Listed pressure connectors, splices, or taps. d. Service entrance conductors cannot be spliced. Incorrect. Only listed methods are approved for splicing. Correct! Approved splicing methods maintain safety and compliance. NEC permits splicing using listed devices like pressure connectors to ensure safety and reliability. Demand factors vary with the number of units. 13 / 50 What load factor applies to kitchen equipment other than in dwellings (220.56)? a. Based on the nameplate rating. b. 100% for all loads. c. 65% for six or more units. d. 80% for all kitchen loads. Incorrect. Refer to Table 220.56 for demand factors. Correct! 65% is applied for six or more units. Demand factors reduce kitchen equipment loads, with 65% applied for six or more units. Service conductors must not share space with conductors serving different functions. 14 / 50 What type of conductors are prohibited in the same raceway as service conductors per 230.7? a. None, all conductors are allowed in the same raceway. b. Grounding electrode conductors. c. Load management conductors. d. Branch circuit and feeder conductors. Incorrect. Only specific conductors are allowed in service raceways. Correct! Branch circuit and feeder conductors are prohibited in the same raceway as service conductors. Service conductors must not share a raceway with branch circuits or feeders to prevent interference or hazards. Ranges exceeding 12 kW require adjustments. 15 / 50 What adjustment is made for electric ranges over 12 kW (220.55 Note 1)? a. Calculated separately as an individual load. b. Subtracted from the total demand. c. Ignored for calculation purposes. d. Increase demand by 5% for each kW over 12. Incorrect. Ranges over 12 kW require a 5% demand increase. Correct! Add 5% per kW over 12 for range loads. For ranges over 12 kW, the demand is increased by 5% per additional kW. Focus on identification for clarity and safety. 16 / 50 What labeling is required for services supplying multiple disconnects per 230.2(E)? a. Labels are optional for outdoor services. b. No labeling required for grouped disconnects. c. Only label main disconnects. d. A permanent plaque identifying each service, feeder, and branch circuit. Incorrect. Labeling is required to identify Correct! A permanent plaque is mandatory for multiple services. Clear labeling identifies service sources for maintenance and emergency responders. Check the table for varying factors based on quantity. 17 / 50 What demand factor applies to household electric dryers per Table 220.54? a. 100% for all dryers. b. Variable based on the number of dryers, starting at 100% for 1-4 units. c. Demand factors are not applicable. d. 75% for four or more dryers. Incorrect. Review Table 220.54 for the correct demand factor. Correct! The demand factor changes based on the number of dryers. Demand factors decrease as the number of dryers increases to reflect diversified usage. Think about the smallest common circuit capacity. 18 / 50 What is the minimum ampacity for a single branch-circuit disconnecting means (225.39(A))? a. 15 amperes. b. 20 amperes. c. No minimum specified. d. 30 amperes. Incorrect. The minimum ampacity is 15 amperes. Correct! 15 amperes is the minimum requirement. A branch-circuit disconnecting means must have a minimum ampacity of 15 amperes to ensure proper load handling. Focus on the scope of services in electrical systems. 19 / 50 What does Article 230 primarily cover? a. Grounding methods for electrical equipment. b. Branch circuits for residential units. c. Service conductors and their control and protection requirements. d. Overhead feeder line clearances. Incorrect. This article addresses service conductors, not branch circuits or feeders. Correct! Article 230 focuses on service conductors and their control and protection. Article 230 provides guidelines for installing and maintaining service conductors and equipment for services. Cooking appliances in instructional settings have specific demand factors. 20 / 50 How are electric cooking appliance loads determined in instructional programs (220.55)? a. Not required unless over 12 kW. b. At 1500 VA per appliance. c. Based on Table 220.55 demand factors. d. Using the nameplate rating of each appliance. Incorrect. Demand factors from Table 220.55 must be applied. Correct! Table 220.55 is used for these calculations. Cooking appliance loads in instructional programs use Table 220.55 to account for diversified use. Consider exterior measurements. 21 / 50 Correct! Nominal system voltages are the standard for NEC calculations. a. Based on livable square footage. b. Excluding all rooms without power outlets. c. From the inside wall dimensions. d. Using the outside dimensions of the building. Incorrect. Interior measurements are not used. Correct! Floor area is calculated using the outside dimensions. NEC requires calculations based on exterior dimensions, excluding porches or unfinished spaces. Noncoincident loads are mutually exclusive. 22 / 50 What load is used for calculating noncoincident loads (220.60)? a. Both loads combined at 50%. b. The sum of all loads. c. Only the largest load likely to operate at one time. d. 125% of the smaller load. Incorrect. Use only the largest load for noncoincident calculations. Correct! Only the largest load is used for noncoincident calculations. Noncoincident loads are calculated using the larger load expected to operate at a given time. New restaurant calculations involve specific demand factors. 23 / 50 How is a feeder load for new restaurants calculated (220.88)? a. Based on demand factors from Table 220.88. b. By the connected load without adjustments. c. 1500 VA per appliance. d. Using the larger of heating or cooling loads. Incorrect. Table 220.88 specifies demand factors for restaurants. Correct! Demand factors reduce total connected loads in restaurant settings. Restaurant feeder loads are calculated using demand factors to account for diversified equipment usage. Minimum size ensures both capacity and mechanical strength. 24 / 50 What is the minimum size for underground service conductors per 230.31(B)? a. 12 AWG copper or 10 AWG aluminum for all installations. b. 6 AWG copper or 4 AWG aluminum. c. Size is determined solely by voltage drop. d. 8 AWG copper or 6 AWG aluminum. Incorrect. Refer to NEC guidelines for minimum conductor size. Correct! 8 AWG copper or 6 AWG aluminum is the minimum size. The NEC specifies a minimum size for underground service conductors to handle loads safely and withstand physical stresses. Surge protection is mandatory for specific occupancy types 25 / 50 When is a surge-protective device (SPD) required on a feeder (225.42)? a. Only for industrial buildings. b. SPDs are optional for all feeders. c. For feeders supplying dwelling units, dormitories, or similar areas. d. Only in areas prone to lightning strikes. Incorrect. SPDs are required for certain feeder types and occupancies. Correct! SPDs are essential for protection in these settings. SPDs protect sensitive equipment in areas like dwelling units and dormitories from power surges. Focus on calculations for power distribution 26 / 50 1. What does Article 220 primarily address? a. Grounding and bonding requirements. b. Electrical equipment marking requirements. c. Load calculations for branch circuits, feeders, and services. d. Circuit breaker sizing. Incorrect. This article focuses on calculating electrical loads. Correct! Article 220 covers load calculations for electrical installations. Article 220 provides methods for determining the loads of branch circuits, feeders, and services. Ground-fault protection applies to high-current disconnects. 27 / 50 What does 215.10 require for feeders on solidly grounded wye systems over 150 volts to ground? a. Grounding of all ungrounded conductors. b. Insulation rated for at least 600 volts. c. Ground-fault protection of equipment for disconnects rated 1000 amps or more. d. No additional protection is required. Incorrect. Ground-fault protection is mandatory for these systems. Correct! Disconnects rated 1000 amps or more require ground-fault protection. Ground-fault protection ensures safety in systems with high disconnect ratings and specific voltage thresholds. The ampacity must match the calculated electrical load. 28 / 50 What is the minimum ampacity for service entrance conductors as per 230.42? a. Always rated at 100 amperes. b. Based on the branch circuit ampacity. c. Sufficient to carry the calculated load. d. 125% of the noncontinuous load only. Incorrect. Ampacity must match the load, not just a fixed value. Correct! Ampacity is determined by the calculated load. Service entrance conductors must be rated to handle the calculated load for the building or structure. Conductors near buildings must meet specific insulation standards. 29 / 50 What type of conductor insulation is required within 10 feet of a building (225.4)? a. Insulation is not required for aerial conductors. b. Thermoset or thermoplastic rated for the nominal voltage. c. Aluminum only. d. Bare or uninsulated for all voltages. Incorrect. Bare or uninsulated conductors are not permitted near buildings. Correct! Conductors must have thermoset or thermoplastic insulation. Insulation ensures safety for conductors near buildings or structures. Thermoset or thermoplastic materials are required. Pedestrian safety requires minimum clearance. 30 / 50 What clearance is required for overhead conductors above sidewalks with voltages not exceeding 150V to ground (225.18)? a. 12 feet. b. 8 feet. c. No specific clearance required. d. 10 feet. Incorrect. The clearance is specified as 10 feet for safety. Correct! 10 feet ensures pedestrian safety below conductors. Overhead conductors must maintain 10 feet of clearance to prevent accidental contact by pedestrians. Think about standardized calculation values. 31 / 50 What voltage is used for load calculations unless otherwise specified (220.5(A))? a. Nominal system voltages, such as 120 or 240 volts. b. Voltage drop across the longest circuit. c. Measured voltage during testing. d. Nominal system voltages. Incorrect. Use nominal system voltage for calculations. Correct! Nominal system voltages are the standard for NEC calculations. Nominal voltages like 120V, 240V, and 208Y/120 are standard for load calculations. This article addresses circuits run between buildings or structures. 32 / 50 What is the scope of Article 225? a. Requirements for outside branch circuits and feeders not exceeding 1000 volts AC or 1500 volts DC. b. Installation of outdoor lighting systems. c. Grounding and bonding for outdoor equipment. d. Installation of outdoor lighting systems. Incorrect. This article does not focus on grounding or lighting systems alone. Correct! Article 225 governs outside branch circuits and feeders. Article 225 sets standards for outside branch circuits and feeders, covering both overhead and underground installations. Neutral loads depend on imbalance. 33 / 50 How is the neutral load for feeders calculated per 220.61(A)? a. The unbalanced load plus 20%. b. The total connected load. c. Based on the total feeder ampacity. d. The maximum unbalanced load between the neutral and ungrounded conductors. Incorrect. Neutral loads are calculated based on imbalance. Correct! The calculation uses the maximum unbalanced load. The neutral load is determined by the maximum load difference between the neutral and any ungrounded conductor. Natural supports lack reliability and durability. 34 / 50 What is prohibited as a support for overhead service conductors per 230.10? a. Metal brackets. b. Insulated strain insulators. c. Vegetation, such as trees. d. Concrete poles. Incorrect. Vegetation cannot be used as a conductor support. Correct! Trees and vegetation are prohibited as supports for service conductors. Trees and other vegetation are not reliable or durable supports for overhead conductors. Demand factors adjust for diversified loads in multifamily settings. 35 / 50 How are feeder loads for multifamily dwellings calculated (220.84)? a. Using demand factors for the total connected load. b. Calculated without any demand factors. c. Only the largest unit load is considered. d. Based on individual unit loads. Incorrect. Use demand factors for the total load. Correct! Multifamily dwelling loads use demand factors for efficiency. Demand factors reduce the total connected load for multifamily dwellings to reflect expected usage. Exceptions allow additional services for certain needs. 36 / 50 How many services are generally allowed for a building per 230.2? a. Unlimited for multi-occupancy buildings. b. One unless additional services are permitted under specific conditions. c. Two for residential buildings. d. One per electrical meter. Incorrect. The standard is one service, with some exceptions. Correct! Only one service is generally permitted unless exceptions are met. A building typically has one service unless specific exceptions apply, such as capacity or emergency systems. Load values vary by occupancy type. 37 / 50 What is the minimum lighting load for non-dwelling occupancies per Table 220.42(A)? a. Specified per occupancy type, such as 1.5 VA/ft² for offices. b. 1 VA/ft² for all spaces. c. Not required if no permanent lighting is installed. d. 3 VA/ft² for all spaces. Lighting loads depend on the occupancy type as outlined in Table 220.42(A). Correct! The load calculation is based on the occupancy type. Lighting loads depend on the occupancy type as outlined in Table 220.42(A). Check the allowed percentage reduction. 38 / 50 What reduction is permitted for unbalanced loads over 200 amps per 220.61(B)? a. 70% of the portion exceeding 200 amps. b. 50% of the total unbalanced load. c. 80% of the total connected load. d. No reduction is allowed. Incorrect. The allowed reduction is 70% for unbalanced loads over 200 amps. Correct! Loads over 200 amps are reduced by 70%. Unbalanced loads above 200 amps can have a 70% reduction applied. Natural supports are not considered reliable. 39 / 50 What is prohibited as a support for overhead conductors (225.26)? a. Vegetation, such as trees. b. Metal brackets. c. Insulated strain insulators. d. Concrete poles. Incorrect. Natural supports like trees are not permitted. Correct! Vegetation is prohibited as a conductor support. Trees or vegetation can grow or degrade over time, compromising conductor safety. Compatibility with materials is crucial for long-term safety. 40 / 50 Correct! The clearance ensures safety near openings. 230.8? a. Concrete grout for all installations. b. Sealant compatible with conductor insulation. c. No sealant is necessary. d. Weather-resistant tape. Incorrect. The sealant must work with the conductor’s insulation. Correct! Compatible sealants ensure safe and effective sealing. Sealants must be compatible with conductor insulation to prevent damage and ensure effectiveness. Accessibility is critical for safety. 41 / 50 Where must service disconnecting means be located per 230.70(A)? a. Adjacent to the utility transformer. b. Inside a building near the electrical meter. c. In any convenient location within the building. d. At a readily accessible location, either outside or inside nearest the point of service conductor entrance. Incorrect. The disconnecting means must be readily accessible and near the point of entry. Correct! The location ensures accessibility and safety. The service disconnect must be easily accessible and near the conductor entrance to ensure safety. Think about the standard load assigned to laundry circuits. 42 / 50 How must laundry circuits be calculated for dwelling units (220.52(B))? a. At 1500 VA per laundry circuit. b. Based on square footage. c. Using the actual nameplate rating of equipment. d. Included in general lighting loads. Incorrect. Laundry circuits are assigned a specific VA value. Correct! Laundry circuits are calculated at 1500 VA each. Each 2-wire laundry branch circuit in a dwelling is calculated at 1500 VA. Clearance varies based on location and voltage. 43 / 50 What is the vertical clearance for service conductors passing above residential driveways per 230.24(B)(2)? a. 15 feet for all areas. b. 10 feet. c. 18 feet for residential driveways. d. 12 feet. Incorrect. The clearance for residential driveways is 12 feet. Correct! 12 feet is the required clearance for residential driveways. A 12-foot clearance ensures safety for conductors above residential driveways with restricted vehicle access. Show window calculations are based on horizontal measurement. 44 / 50 How are show window lighting loads calculated (220.46(A))? a. 200 VA per linear foot of show window. b. 180 VA per lighting outlet. c. Based on the wattage of installed luminaires. d. A fixed load of 1200 VA for all show windows. Incorrect. Show window lighting is not based on outlet or luminaire wattage. Correct! Show window lighting loads use a per-foot calculation. The NEC requires show window lighting to be calculated at 200 VA per linear foot along its base. Think about the limit for separating service disconnects 45 / 50 What is the maximum number of service disconnects allowed per service under 230.71(A)? a. Three disconnects in a single enclosure. b. One per branch circuit. c. One per branch circuit. d. Unlimited if located in separate compartments. Incorrect. The maximum number of service disconnects is six. Correct! The limit is six service disconnects per service. The NEC permits up to six service disconnects per service to simplify and organize electrical systems. Focus on the connection method for outdoor pendants. 46 / 50 What is required for outdoor luminaires attached as pendants (225.24)? a. They must hang at least 20 feet above ground. b. They must only use single-strand wires. c. They must be within 5 feet of the power source. d. Connections to circuit wires must be staggered. Incorrect. Staggered connections are required for safety. Correct! Staggered connections ensure safer and more reliable installations. Staggered connections reduce the risk of electrical shorts and improve reliability in outdoor luminaires. Minimum loads are set based on unit area. 47 / 50 What is the minimum demand load for dwelling unit general lighting per 220.41? a. 33 VA per square meter. b. Based on installed luminaires. c. Calculated from room dimensions. d. 3 VA per square foot. Incorrect. The load is calculated at 3 VA per square foot. Correct! General lighting load is set at 3 VA per square foot. Dwelling unit general lighting loads are calculated at 3 VA per square foot of floor area. Demand factors reduce calculated loads based on diversity. 48 / 50 What is the demand factor for non-dwelling receptacle loads over 10 kVA (220.47)? a. 100% for all receptacles. b. 50% for loads exceeding 10 kVA. c. 75% for loads exceeding 5 kVA. d. Demand factors do not apply to non-dwelling receptacles. Incorrect. Non-dwelling receptacle loads have specific demand factors. Correct! Loads above 10 kVA are calculated at 50%. Receptacle loads exceeding 10 kVA are calculated at 50% to account for diversified usage. EMS loads are treated as continuous for safety and reliability. 49 / 50 What is required for energy management systems (EMS) under 220.70? a. Setpoint values must be included as continuous loads. b. Load calculations must exclude the EMS. c. EMS setpoints are ignored in calculations. d. EMS values are considered only for optional calculations. Incorrect. EMS setpoints must be included as continuous loads. Correct! EMS setpoints are treated as continuous loads for calculations. EMS setpoint values are added as continuous loads to feeder or service calculations. Overhead spans require sufficient mechanical strength. 50 / 50 What is the minimum size for overhead span conductors up to 50 feet in length (225.6(A))? a. 10 AWG copper or 8 AWG aluminum. b. No minimum size specified. c. 12 AWG copper or 10 AWG aluminum. d. 14 AWG copper or 12 AWG aluminum. Incorrect. The minimum size for overhead spans is larger than specified. Correct! The minimum size ensures adequate mechanical strength. Conductor sizes are determined by the need to support weight and withstand environmental forces. 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