eep April 10, 2025 NEC 500-590 NEC Quizzes Report a question What’s wrong with this question? You cannot submit an empty report. Please add some details. 0% Article 500-590 Part01 This quiz consists of 50 carefully selected questions covering NEC Articles 500 through 590, which provide essential guidelines for hazardous locations (Article 500), special occupancies (Article 525), and temporary installations (Article 590). These sections of the National Electrical Code focus on safety, classification of hazardous areas, material requirements, and proper installation practices for environments with heightened risks. The randomly generated questions ensure a thorough assessment of your understanding, reinforcing key principles related to explosive atmospheres, grounding requirements, temporary wiring regulations, and specific occupancy considerations. Some topics may reappear in different contexts to strengthen comprehension and application. Your feedback is invaluable! If you notice any discrepancies or have suggestions for improvement, please report them. Your insights help maintain the accuracy and effectiveness of this learning tool. Expandable units require durable and safe wiring connections. 1 / 50 How must expandable unit circuits in park trailers be connected (552.48(O))? a. Using flexible cords listed for hard usage and wet locations or other approved methods. b. Using a single-wire conductor. c. Connected without any protective devices. d. Wiring methods are not specified for expandable units. Incorrect. The wiring must comply with approved methods for safety. Correct! Flexible cords or approved methods are required for expandable unit circuits. Expandable unit circuits must use flexible cords listed for hard usage and wet locations, or other approved methods, to ensure safe connections. Park trailers are not intended as permanent residences or for commercial purposes. 2 / 50 What is the primary scope of NEC Article 552 (552.1)? a. Covers electrical installations in park trailers for seasonal use. b. Includes commercial units like banks and clinics. c. Covers recreational vehicles with no specific size limits. d. Applies only to permanent dwellings in trailer parks. Incorrect. Article 552 applies to seasonal park trailers. Correct! The article focuses on seasonal park trailers. Article 552 applies to park trailers used seasonally, with specific size and use restrictions. Temporary receptacles, especially on construction sites, pose a higher risk of shock. 3 / 50 hat GFCI protection is required for 15-, 20-, and 30-ampere temporary receptacle outlets (590.6(A)(1))? a. Required only on circuits with more than two receptacles. b. GFCI protection is not required. c. GFCI protection is required for all such outlets. d. Required only for outdoor use. Incorrect. GFCI protection is mandatory for safety. Correct! GFCI protection is required for all such outlets. GFCI protection is mandatory for 15-, 20-, and 30-ampere receptacle outlets in temporary installations to protect personnel. This article addresses small craft and associated facilities. 4 / 50 What is the scope of NEC Article 555 (555.1)? a. Covers only residential docks. b. Applies only to large ships over 300 gross tons. c. Covers electrical installations for marinas, boatyards, floating buildings, and docking facilities for small craft. d. Includes all facilities with electrical systems near water. Incorrect. The scope excludes large ships and residential-only docks. Correct! The article focuses on facilities for small craft and floating buildings. Article 555 applies to marinas, boatyards, floating buildings, and docking facilities for small craft under 300 gross tons, focusing on electrical safety in these environments. The mounting height ensures accessibility while meeting safety standards. 5 / 50 What is required for the mounting height of site supply equipment (551.77(D))? a. Between 2 feet and 6 feet 6 inches above the electrical datum plane. b. Must be installed exactly 4 feet above ground. c. No specific mounting height is required. d. Cannot exceed 5 feet above ground. Incorrect. The mounting height must fall within the specified range. Correct! The height must be between 2 feet and 6 feet 6 inches above the datum plane. The mounting height must be between 2 feet and 6 feet 6 inches above the electrical datum plane to ensure safety and usability. Protection requirements apply to all buried conductors. 6 / 50 How must conductors in RV park underground service be installed (551.80(B))? a. Protected only where exposed above ground. b. Must be protected by listed raceways or enclosures. c. May be direct-buried without protection. d. Must use rigid metallic conduit only. Incorrect. Direct burial without protection is not permitted. Correct! Approved raceways or enclosures must protect buried conductors. Conductors must be protected by approved raceways or enclosures, ensuring safety and durability underground. Outdoor equipment must meet environmental standards. 7 / 50 How must outdoor luminaires in park trailers be rated (552.54(C))? a. Suitable for damp locations only. b. Rated for indoor and outdoor use. c. No rating is required for outdoor luminaires. d. Listed for outdoor or wet locations. Incorrect. Outdoor luminaires must be rated for wet locations. Correct! Outdoor luminaires must be listed for outdoor or wet locations. Outdoor luminaires and equipment must be listed for use in wet or outdoor locations to ensure durability and safety. Safety standards mandate protection for accessible outdoor receptacles. 8 / 50 What are the GFCI protection requirements for outdoor receptacles in mobile homes (550.13(B))? a. GFCI protection is required only in areas with wet conditions. b. Only 240-volt outdoor receptacles require GFCI protection. c. All outdoor receptacles accessible at grade level must have GFCI protection. d. Outdoor receptacles do not require GFCI protection. Incorrect. GFCI protection is required for all grade-level outdoor receptacles. Correct! All grade-level outdoor receptacles need GFCI protection. All outdoor receptacles accessible at grade level in mobile homes must have GFCI protection to prevent shock hazards. The majority of RV sites require 30-amp service. 9 / 50 What is the minimum rating for service equipment in RV site supply (551.71)? a. 20 amperes. b. 50 amperes for all sites. c. 30 amperes for 70% of sites. d. 15 amperes. Incorrect. The majority of sites require 30-ampere service. Correct! 30-ampere service is required for most RV sites. A minimum of 70% of RV sites must have 30-ampere service. Other requirements vary for 20-amp and 50-amp supplies. GFCI settings prevent electrical shock incidents in marine environments. 10 / 50 What GFCI protection is required for branch circuits supplying shore power (555.35(B))? a. Rated at no more than 100 milliamperes. b. Rated at no more than 30 milliamperes. c. Required only for circuits exceeding 50 amperes. d. No GFCI protection is required for shore power circuits. Incorrect. GFCI protection is required and must not exceed 30 milliamperes. Correct! GFCI protection for shore power must not exceed 30 milliamperes. GFCI devices for shore power must be rated at no more than 30 milliamperes, balancing safety with reliability. Protection ensures circuit integrity and prevents hazards. 11 / 50 How must low-voltage circuits in park trailers be protected against physical damage (552.10(C)(1))? a. Conductors must be routed away from sharp edges, moving parts, or heat sources. b. Physical protection is required only for circuits exceeding 20 volts. c. Protection applies only to outdoor circuits. d. No protection is required for low-voltage circuits. Incorrect. Low-voltage circuits must be protected as specified. Correct! Routing and securing conductors prevent physical damage. Low-voltage circuits must be routed and secured to avoid sharp edges, moving parts, or heat sources, ensuring safety and functionality. Secure installation prevents damage during movement. 12 / 50 What is required for appliances in park trailers during transit (552.58)? a. Appliances must be disconnected. b. No specific requirements exist for appliance transit. c. Appliances must be installed using flexible cords. d. Appliances must be securely fastened to prevent movement. Incorrect. Secure fastening is required to prevent movement. Correct! Appliances must be fastened to ensure safety during transit. Appliances must be securely fastened in place to prevent damage or hazards during transit. Stability during transit is essential for mobile home safety 13 / 50 How must appliances in mobile homes be installed to prevent movement during transit (550.14(A))? a. Using removable fasteners for temporary attachment. b. By securing them with ropes or straps. c. No specific installation requirements are mandated. d. With permanent fasteners to ensure stability. Incorrect. Permanent fasteners are required to secure appliances. Correct! Permanent fasteners ensure appliances remain stable during transit. Appliances in mobile homes must be secured with permanent fasteners to prevent movement during transit. Secure installation prevents damage and ensures stability. 14 / 50 How must electrical enclosures on piers be supported (555.31(A))? a. Attached using flexible cables and mounting clips. b. Mounted directly to conduits for support. c. Securely supported by structural members, independent of conduits. d. Positioned above the deck with no additional support. Incorrect. Electrical enclosures cannot rely on conduits for support. Correct! Enclosures must be securely supported independently of conduits Electrical enclosures must be securely supported by structural members, independent of conduits, to prevent movement and damage. The datum plane accounts for water levels and pier height. 15 / 50 What is the electrical datum plane for floating piers (555.3(A))? a. 1 foot above the pier deck. b. 2 feet above the waterline. c. At the highest water level for the region. d. 30 inches above the water level and at least 12 inches above the deck. Incorrect. The datum plane requires specific height above water and the deck. Correct! The electrical datum plane is 30 inches above water and 12 inches above the deck. For floating piers, the electrical datum plane must be 30 inches above the water level and at least 12 inches above the pier deck to prevent electrical hazards. Clearance requirements ensure safe access to panelboards. 16 / 50 How must panelboards in park trailers be installed (552.45(B))? a. In a readily accessible location with a working clearance of at least 24 inches wide and 30 inches deep. b. Mounted anywhere without clearance requirements. c. Installed outside the trailer for easy access. d. Clearance is required only if the panelboard has more than six circuits. Incorrect. Panelboards require clearances for accessibility and safety. Correct! Clearance ensures safe and easy access to panelboards. Panelboards must be installed in accessible locations with specified clearances for safe operation and maintenance. Faceplates must meet specific requirements for outdoor use. 17 / 50 What type of faceplates are allowed for outdoor receptacles in park trailers (552.48(K))? a. Faceplates are not required for outdoor receptacles. b. Any type of faceplate can be used. c. Plastic or metal faceplates without grounding requirements. d. Metal faceplates must be grounded, and nonmetallic faceplates must comply with NEC 406.6(C). Incorrect. Metal faceplates must be grounded, and nonmetallic faceplates must comply with NEC standards. Correct! These faceplate requirements ensure compliance and safety. Outdoor receptacle faceplates must comply with specific grounding and material requirements, ensuring safety and durability. Emergency disconnects improve response time in critical situations. 18 / 50 What is required for emergency electrical disconnects at marina power outlets (555.36(C))? a. They are optional if disconnects are located nearby. b. Must be clearly marked but not necessarily accessible. c. They are only required for circuits exceeding 240 volts. d. They must be marked "Emergency Shutoff," readily accessible, manually resettable, and located within sight. Incorrect. Emergency disconnects are required to be clearly marked and accessible. Correct! Emergency disconnects must meet these specifications. Emergency shutoff devices must be accessible, clearly marked, and capable of disconnecting power immediately to improve safety in emergencies. Low ceilings in park trailers necessitate specific luminaire safety standards. 19 / 50 What requirements apply to luminaires above tubs or showers in park trailers (552.54(B))? a. They must be enclosed, gasketed, and listed for wet locations with GFCI protection. b. They can be open luminaires rated for damp locations. c. Any residential-grade luminaire can be installed. d. No luminaires are allowed above tubs or showers. Incorrect. Specific safety standards apply to luminaires in wet locations. Correct! These safety measures are required for luminaires in these areas. Luminaires above tubs or showers must be enclosed, gasketed, listed for wet locations, and equipped with GFCI protection for safety. Submersion and low voltage are critical safety considerations. 20 / 50 What type of luminaires is permitted below the electrical datum plane (555.38(B))? a. Any luminaire rated for wet locations. b. Luminaires identified as submersible and operating below the low-voltage contact limit. c. Only luminaires with a gasketed enclosure. d. No luminaires are allowed below the electrical datum plane. Incorrect. Only submersible luminaires with lowvoltage operation are permitted. Correct! Submersible, low-voltage luminaires are required below the datum plane. Below the electrical datum plane, luminaires must be submersible, operate below the low-voltage contact limit, and comply with isolating transformer requirements to minimize hazards. The spacing rule ensures convenient access to outlets. 21 / 50 What is the spacing requirement for receptacle outlets inside recreational vehicles (551.41(A))? a. At least every 5 feet along the wall. b. No point on the floor line can be more than 6 feet from an outlet. c. Only required near appliances. d. Receptacles are optional for small vehicles. Incorrect. The spacing requirement is based on a 6- foot rule. Correct! The rule ensures every area is within 6 feet of an outlet. Outlets must be placed so that no point along the floor line is more than 6 feet from a receptacle, ensuring coverage throughout the RV. Luminaires in wet areas must meet specific safety standards. 22 / 50 What type of luminaires can be installed over bathtubs in mobile homes (550.14(D))? a. Fluorescent luminaires only. b. Pendant-type luminaires are allowed. c. Only enclosed and gasketed luminaires listed for wet locations. d. Any luminaire rated for residential use. Incorrect. Luminaires must be listed for wet locations and properly enclosed. Correct! Only enclosed and gasketed luminaires listed for wet locations are allowed. Luminaires installed over bathtubs or in shower stalls must be enclosed, gasketed, and listed for wet locations to ensure safety Temporary wiring is subject to frequent movement and risks of damage. 23 / 50 How must temporary wiring be protected from physical damage (590.4(H))? a. Protected from sharp edges, doorways, and pinch points. b. Secured only at the connection points. c. Placed directly on floors without protection. d. No special protection is required. Incorrect. Protection from damage is essential for temporary wiring. Correct! Temporary wiring must be safeguarded against damage. Temporary wiring must be protected from sharp edges, pinch points, and doorways to prevent damag The number of circuits depends on specific conditions. 24 / 50 What is the maximum number of 15- or 20-ampere branch circuits allowed in park trailers without an energy management system (552.46(A))? a. Four circuits. b. Three circuits. c. Unlimited circuits if loads are balanced. d. Five circuits, with a possible sixth for the power converter. Incorrect. Five circuits are standard, with a sixth allowed for the power converter under specific conditions. Correct! Five circuits are standard, with a sixth for the power converter. Park trailers can have up to five circuits for general use, with a sixth circuit permitted for the power converter if loads are managed appropriately. The article focuses on vehicles and their connection to electrical supplies. 25 / 50 What does NEC Article 551 cover (551.1)? a. Low-voltage automotive circuits only. b. Electrical installations for recreational vehicles and parks. c. Permanent wiring in residential areas. d. Only mobile homes. Incorrect. The scope includes recreational vehicles and parks. Correct! The article addresses installations for RVs and parks Article 551 covers electrical systems in recreational vehicles, connections to electrical supplies, and installations in parks. Safety standards for splices in temporary wiring closely mirror those for permanent installations. 26 / 50 What is required for splices in temporary wiring (590.4(G))? a. Splices must be enclosed in boxes unless specific exceptions apply. b. Must be enclosed in boxes only for permanent installations. c. Splices are not permitted in temporary installations. d. Splices do not need to be enclosed if they are insulated. Incorrect. Splices typically need to be enclosed unless specific exceptions are met. Correct! Splices require enclosures unless exceptions apply. Splices in temporary wiring must be enclosed unless specific exceptions, such as use on construction sites with listed cords, apply. All sites must have at least one standard outlet. 27 / 50 What type of receptacle must every RV site include (551.71(A))? a. A 30-ampere receptacle only. b. At least one 20-ampere, 125-volt weather-resistant receptacle. c. No receptacle is required. d. A 50-ampere receptacle only. Incorrect. A 20-ampere receptacle is required at every site. Correct! Every site must have a 20-ampere, 125-volt receptacle. Each site must include at least one 20-ampere, 125-volt weatherresistant receptacle. Vertical and horizontal clearances prevent accidental contact. 28 / 50 What is the minimum clearance for overhead conductors in areas subject to RV movement (551.79)? a. 15 feet vertically and 5 feet horizontally. b. Overhead clearance is not specified. c. 12 feet vertically and no horizontal clearance is required. d. 18 feet vertically and 3 feet horizontally. Incorrect. The required vertical clearance is 18 feet. Correct! Overhead conductors require 18 feet vertically and 3 feet horizontally. Open conductors over areas subject to RV movement must maintain a vertical clearance of 18 feet and horizontal clearance of 3 feet. The datum plane accounts for water levels and pier height. 29 / 50 What is the electrical datum plane for floating piers (555.3(A))? a. 1 foot above the pier deck. b. 30 inches above the water level and at least 12 inches above the deck. c. 2 feet above the waterline. d. At the highest water level for the region. Incorrect. The datum plane requires specific height above water and the deck. Correct! The electrical datum plane is 30 inches above water and 12 inches above the deck. For floating piers, the electrical datum plane must be 30 inches above the water level and at least 12 inches above the pier deck to prevent electrical hazards. Feeder conductors must handle sufficient load capacity. 30 / 50 What is the minimum ampacity for feeder conductors in RV parks (551.72(A))? a. 20 amperes. b. 30 amperes. c. 15 amperes. d. 50 amperes. Incorrect. The minimum required ampacity is 30 amperes Correct! Feeder conductors must be at least 30 amperes. Feeder conductors in RV parks must have an ampacity of at least 30 amperes to meet standard load requirements. Protection must align with the circuit’s conductor capacity 31 / 50 What overcurrent protection is required for branch circuits in park trailers (552.42(A))? a. Branch circuits do not require overcurrent protection. b. Overcurrent devices must not exceed the ampacity of the circuit conductors. c. Protection must match the total load of the park trailer. d. A single 50-amp device protects all branch circuits. Incorrect. Overcurrent protection must match conductor ampacity. Correct! Protection devices must align with circuit conductor ratings. Branch circuits require overcurrent protection rated no higher than the ampacity of their conductors, ensuring safe operation. Cord length depends on the location of the entry point. 32 / 50 What is the minimum required length for a power-supply cord with a side entry on a park trailer (552.44(B))? a. 23 feet. b. 21 feet. c. 25 feet. d. 28 feet. Incorrect. The minimum length for side entry is 23 feet. Correct! 23 feet is the minimum for side entry cords. For park trailers with a side entry, the power-supply cord must have a minimum length of 23 feet to ensure proper reach. Specific grounding standards ensure safety in corrosive environments. 33 / 50 What grounding conductor is required for docking facilities (555.37(B))? a. An insulated copper conductor, sized per 250.122, and not smaller than 12 AWG. b. Any conductor approved for outdoor use. c. Grounding conductors are not required. d. A bare copper wire. Incorrect. An insulated copper conductor, at least 12 AWG, is required. Correct! Insulated copper conductors meet safety and environmental standards. An insulated copper conductor, at least 12 AWG, must be used to connect equipment to the grounding system, ensuring safety and corrosion resistance. Overcurrent protection matches the circuit’s conductor size. 34 / 50 What overcurrent protection is required for branch circuits in RVs (551.43(A))? a. No overcurrent protection is required. b. Must not exceed 150% of the connected load. c. Rated not more than the circuit conductors. d. Only required for circuits over 20 amperes. Incorrect. Overcurrent protection must not exceed the conductor rating. Correct! Overcurrent protection must match the conductor size. Overcurrent protection devices must be rated no higher than the capacity of the conductors they protect, ensuring safe operation. Kitchens require specific branch circuit configurations for safety and functionality, 35 / 50 How should branch circuits for kitchen countertop receptacles be designed (550.12(B))? a. Supplied by general-purpose circuits. b. Supplied by at least two 20-ampere small-appliance branch circuits. c. Supplied by one 15-ampere branch circuit. d. Shared with circuits supplying dining room lighting. Incorrect. At least two 20-ampere circuits are required for countertop receptacles. Correct! Two 20-ampere small-appliance branch circuits are mandatory. Kitchen countertop receptacles must be supplied by at least two 20- ampere small-appliance branch circuits, which may also serve receptacles in specified areas. Voltage limitations reduce risks in dock environments. 36 / 50 What is the maximum voltage allowed for pier power distribution systems under normal conditions (555.5)? a. 600 volts phase to phase. b. 480 volts phase to phase. c. Voltage is unrestricted for marinas. d. 250 volts phase to phase. Incorrect. The standard voltage limit is 250 volts phase to phase. Correct! 250 volts phase to phase is the standard limit for pier power distribution systems. Pier power distribution systems must not exceed 250 volts phase to phase under normal conditions unless managed by qualified personnel under engineering supervision. Receptacle height prevents submersion during normal operation. 37 / 50 How must shore power receptacles be installed on fixed piers (555.33)? a. Receptacles are optional on fixed piers. b. They must be at least 12 inches above the deck and not below the electrical datum plane. c. No specific requirements exist for receptacle height. d. They can be installed at any height if weather-protected. Incorrect. Specific height and datum plane requirements apply to shore power receptacles. Correct! Receptacles must meet height and datum plane criteria. Shore power receptacles must be at least 12 inches above the pier deck and not below the electrical datum plane to reduce the risk of water damage. Grounding must integrate with the service system. 38 / 50 What grounding requirement applies to RV site equipment (551.76(A))? a. Grounding must follow the service equipment's setup. b. Grounding is not required. c. Must use a separate grounding electrode for each site. d. All sites require a supplementary grounding rod. Incorrect. The grounding system must follow service equipment guidelines. Correct! Equipment grounding integrates with the service system. Equipment grounding must connect with the service equipment’s grounding system for continuity and safety. Spacing rules ensure accessibility throughout the trailer. 39 / 50 What is required for receptacle spacing inside park trailers (552.41(A))? a. There is no specified spacing for receptacles. b. Receptacles are required only in kitchens. c. Receptacles must be placed every 4 feet. d. No point on the floor line can be more than 6 feet from a receptacle. Incorrect. The maximum spacing is 6 feet along the floor line. Correct! Spacing ensures no point is more than 6 feet from a receptacle. Receptacles must be spaced so that no point along the floor line is more than 6 feet away from an outlet. Proper support minimizes physical damage to wiring. 40 / 50 How must branch circuits in temporary installations be supported (590.4(J))? a. Must be supported by trees or vegetation. b. No support is required for temporary wiring. c. Must be secured using staples, straps, or similar supports. d. Can be installed on the floor if well-secured. Incorrect. Proper support is mandatory to minimize damage risks. Correct! Staples or straps provide necessary support for branch circuits. Temporary branch circuits must be supported using staples, straps, or similar means to protect them from damage. Vegetation cannot be used for support except for holiday lighting with proper strain relief. Interconnection methods must facilitate relocation and reassembly. 41 / 50 What is required for the interconnection of multiplesection mobile homes (550.19(A))? a. Listed fixed-type wiring methods that allow disassembly. b. Interconnections are optional and can use temporary wiring. c. No specific methods are required for interconnection. d. Connections must be hardwired with no disassembly provisions. Incorrect. The wiring methods must support disassembly for relocation. Correct! Fixed-type wiring that allows disassembly is required. Multiple-section mobile homes must use listed fixed-type wiring methods that allow disassembly when the home is relocated. Holiday lighting has a specific maximum period for safety reasons. 42 / 50 What is the time limit for holiday lighting under temporary installations (590.3(B))? a. 6 months. b. 90 days. c. No time limit. d. 30 days. Incorrect. The limit for holiday lighting is 90 days. Correct! Temporary installations for holiday lighting must not exceed 90 days. Holiday lighting installations are limited to 90 days to ensure they are removed after the event, minimizing risks. Specific conductor materials ensure safety in low-voltage circuits. 43 / 50 What materials are required for low-voltage conductors in park trailers (552.10(B)(1))? a. Copper conductors only. b. Any type of conductor with insulation. c. Aluminum or copper conductors. d. Conductor type is not specified. Incorrect. Only copper conductors are permitted for low-voltage circuits. Correct! Copper conductors are mandatory for lowvoltage circuits. Low-voltage circuits in park trailers must use copper conductors for reliability and safety. Overcurrent protection must match the circuit capacity. 44 / 50 What overcurrent protection is required for branch circuits in mobile homes (550.11(B))? a. No overcurrent protection is needed for branch circuits. b. Each branch circuit must include overcurrent protection rated for the circuit conductor size. c. Overcurrent protection applies only to circuits over 50 amps. d. Each branch circuit must have overcurrent protection of at least 20 amps. Incorrect. The overcurrent protection must match the conductor size. Correct! The devices must match the circuit conductor size. Each branch circuit must include overcurrent protection devices rated to the size of the circuit conductors to ensure safe operation. Batteries produce gases that require safe handling and installation. 45 / 50 How must storage batteries in park trailers be installed (552.10(D))? a. Inside cabinets without ventilation. b. Installation methods are not specified. c. Near spark-producing equipment for easy access. d. In vapor-tight compartments ventilated directly to the exterior. Incorrect. Batteries must be installed in ventilated compartments for safety. Correct! Ventilated, vapor-tight compartments are required for battery installation. Storage batteries must be securely attached in vapor-tight compartments ventilated directly to the exterior to prevent the accumulation of gases. Grounding is critical for safety and must use specific conductors. 46 / 50 What grounding conductor must be used in mobile homes (550.16(B))? a. A green-colored insulated grounding wire in the supply cord or feeder wiring. b. A bare copper conductor only. c. Grounding is optional for mobile homes. d. Only the frame of the mobile home needs to be grounded. Incorrect. A green-colored insulated conductor is required. Correct! A green-colored insulated grounding wire is mandatory. Mobile homes must use a green-colored insulated grounding conductor in the supply cord or permanent feeder wiring for grounding. Equipotential planes mitigate touch and step voltage hazards. 47 / 50 How must equipotential planes be installed near water (555.14(A))? a. Installed within 10 feet of water, bonding metallic parts and extending 36 inches horizontally. b. Required only for indoor marina facilities. c. Optional if all equipment is grounded. d. Required only for voltages below 250 volts. Incorrect. Equipotential planes are required for specified conditions near water. Correct! Equipotential planes are mandatory for safety within 10 feet of water. Equipotential planes must bond metallic parts and extend horizontally from equipment to ensure safety within 10 feet of water. Protection minimizes accidental contact or breakage of lamps. 48 / 50 What is required for lamps used in temporary lighting installations (590.4(F))? a. Lamps must be enclosed or protected by guards. b. Lamps must be rated for damp locations. c. Lamps can be bare as long as they are not touched. d. Lamps need no protection if used indoors. Incorrect. Lamps must be protected to ensure safety. Correct! Lamps need enclosures or guards for protection. Lamps in temporary lighting installations must be enclosed or protected by guards to prevent contact or breakag Temporary installations include various scenarios like construction, fairs, and emergency setups. 49 / 50 What is the scope of NEC Article 590 (590.1)? a. Includes permanent installations with modifications. b. Applies only to temporary outdoor lighting. c. Covers temporary electrical power and lighting installations. d. Limited to construction sites only. Incorrect. The article addresses temporary installations, not permanent ones. Correct! It covers all temporary electrical installations. Article 590 applies to all temporary electrical power and lighting installations, including construction sites, fairs, and emergencies. Cord length differs for rear and side entry points. 50 / 50 What is the maximum cord length for park trailers with a rear entry (552.44(B))? a. 23 feet. b. 28 feet. c. 30 feet. d. 25 feet. Incorrect. The maximum cord length for rear entry is 28 feet. Correct! Rear entry cords must not exceed 28 feet. The maximum cord length for park trailers with a rear entry is 28 feet, ensuring proper reach without excess slack. 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