Questions and Answers
A luminaire, lighting outlets, and a ceiling-suspended (paddle) fan are installed 14 feet directly above the maximum water level of a new permanently-installed outdoor swimming pool. Is this acceptable?
True
Which Chapter 6 article applies to the installation of a fire pump?
Article 695
Where a Chapter 6 article applies for special equipment, do Chapters 1 through 4 still apply to the special equipment?
True
Is a submersible luminaire installed in a fountain with 20 feet of exposed cord in the fountain a violation?
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Is it acceptable to connect individual office furnishings to the building electrical system by a single flexible cord and plug?
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What is the maximum voltage above which underwater luminaires shall not be installed in a permanently-installed swimming pool?
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What is the minimum size of copper conductors required for the branch-circuit conductors in a traveling elevator cable supplying the elevator cab lighting?
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At what interval shall the main-line contact conductors carried along the runway for an overhead rolling crane be supported on insulators?
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Is a solar photovoltaic system permitted to supply power to a building or structure in addition to any other electrical supply system(s)?
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Is a disconnecting means required to be provided in the supply circuit for each arc welder that is not equipped with a disconnect mounted as an integral part of the welder?
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Is overcurrent protection of electrolytic cell DC process power circuits required to comply with the requirements of Article 240?
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Is a grounding electrode system in accordance with Article 250 permitted to be connected to an irrigation machine at the stationary point for lightning protection?
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What is the term for heating of a nominally insulating material due to its own dielectric losses when the material is placed in a varying electric field?
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Are manufactured wiring system types permitted where limited by the applicable article in Chapter 3 for the wiring method used in its construction?
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Where are overcurrent devices that are critical to integrated electrical systems permitted to be located?
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What is the special requirement for large-scale PV electric supply stations?
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What is the maximum combined voltage drop of feeder and branch-circuit conductors supplying sensitive electronic equipment?
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What type of surge protective device (SPD) is permitted to be installed between a wind electric system and any loads served by the premises electrical system?
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What is true with respect to the installation of conductors for control of the keyboards and of the pipe organ sounding apparatus?
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Where is the required ground-fault circuit-interrupter of a mobile electric sign located?
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What type of branch circuit is required to supply each outlet installed for the purpose of charging electric vehicles?
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Is all electrified truck parking space supply equipment required to be accessible by an unobstructed entrance or passageway not less than 30 inches wide?
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What is not a requirement of a cable tag used to identify audio distribution cables identified for future use?
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What is the approval requirement for a fuel cell system?
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What type of installations do the requirements of Article 682 apply to?
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What is the minimum size fixture wire permitted for the control and operating circuits of industrial X-ray equipment where protected by a 15-ampere overcurrent device?
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What type of protection is required for direct-current conductors used in the electroplating process?
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What is the definition of industrial machinery?
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Is flexible power cords and cable permitted for the connection of a modular data center to an external source of power?
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What wiring methods are permitted for use as branch-circuit supply conductors installed under a raised floor in an information technology room?
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Study Notes
Special Equipment of the NEC
Permanently-Installed Swimming Pools
- A luminaire, lighting outlets, and a ceiling-suspended fan installed 14 feet directly above the maximum water level of a permanently-installed outdoor swimming pool is acceptable according to 680.22(B)(1)
- No underwater luminaires shall be installed in a permanently-installed swimming pool that operates on supply circuits over 150V according to 680.23(A)(4)
Fire Pumps
- A fire pump is considered "Special Equipment" and falls under Article 695
General Requirements
- Where a Chapter 6 article applies for special equipment, Chapters 1 through 4 still apply to the special equipment according to 90.3
Flexible Power Cords and Cables
- Individual office furnishings of the free-standing type that do not exceed 9.0 meters (30 ft.) when assembled can be connected to the building electrical system by a single flexible cord and plug according to 605.9(C)
- A submersible luminaire installed in a fountain with 20 feet of exposed cord in the fountain is a violation according to 680.51(E)
Elevators
- The branch-circuit conductors in a traveling elevator cable supplying the elevator cab lighting shall not be smaller than 14 AWG copper, unless parallel conductors are used according to 620.12(A)(1)
Overhead Rolling Cranes
- The main-line contact conductors carried along the runway for an overhead rolling crane shall be supported on insulators at intervals not exceeding 20' according to 610.21(C)
Solar Photovoltaic Systems
- A solar photovoltaic system shall be permitted to supply power to a building or structure in addition to any other electrical supply system(s) according to 690.4(A)
Arc Welders
- A disconnecting means shall be provided in the supply circuit for each arc welder that is not equipped with a disconnect mounted as an integral part of the welder according to 630.13
Electrolytic Cell DC Process Power Circuits
- Overcurrent protection of electrolytic cell DC process power circuits shall not be required to comply with the requirements of Article 240 according to 668.3(C)(2)
Irrigation Machines
- If an irrigation machine has a stationary point, a grounding electrode system in accordance with Article 250, Part III, shall not be permitted to be connected to the machine at the stationary point for lightning protection according to 675.15
Dielectric Heating
- Heating of a nominally insulating material due to its own dielectric losses when the material is placed in a varying electric field is known as dielectric heating according to 665.2
Manufactured Wiring Systems
- Manufactured wiring system types shall not be permitted where limited by the applicable article in Chapter 3 for the wiring method used in its construction according to 604.12
Integrated Electrical Systems
- Location of overcurrent devices that are critical to integrated electrical systems shall be permitted to be accessible with mounting heights permitted to ensure security from operation by unqualified personnel according to 685.10
Large-Scale PV Electric Supply Stations
- Large-scale PV electric supply stations shall be accessible only to authorized personnel according to 691.4
Sensitive Electronic Equipment
- The combined voltage drop of feeder and branch-circuit conductors supplying sensitive electronic equipment shall not exceed 2.5% according to 647.4(D)
Wind Electric Systems
- The surge protective device (SPD) installed between a wind electric system and any loads served by the premises electrical system shall be permitted to be a Type 3 SPD on the circuit serving a wind electric system or a Type 2 SPD located anywhere on the load side of the service disconnect according to 694.7(D)
Pipe Organs
- All of the above is true with respect to the installation of conductors for control of the keyboards and of the pipe organ sounding apparatus according to 650.7
Mobile Electric Signs
- The required ground-fault circuit-interrupter of a mobile electric sign shall be an integral part of the attachment plug or shall be located in the power supply cord within 12" of the attachment plug according to 600.10(C)(2)
Electric Vehicle Charging
- Each outlet installed for the purpose of charging electric vehicles shall be supplied by an individual branch circuit according to 625.40
Electrified Truck Parking Spaces
- All electrified truck parking space supply equipment shall not be accessible by an unobstructed entrance or passageway not less than 30 inches wide according to 626.22(C)
Audio Distribution Cables
- System voltage requirements is not a requirement of a cable tag used to identify audio distribution cables identified for future use according to 640.6(C)(2)
Fuel Cells
- A fuel cell system shall be approved for the application in accordance with either (a) or (b) according to 692.6
Hydromassage Bathtubs
- The requirements of Article 682 apply to I., III., and V. installations according to 682.1
Industrial X-ray Equipment
- The minimum size fixture wire permitted for the control and operating circuits of industrial X-ray equipment where protected by a 15-ampere overcurrent device is 18 AWG according to 660.9
Electroplating
- Direct-current conductors used in the electroplating process shall be protected by any of the above according to 669.9
Industrial Machinery
- A power-driven machine (or group of machines working together in a coordinated manner) not portable by hand while working that is used to process material by cutting; forming; pressure; electrical, thermal, or optical techniques; lamination; or a combination of these processes is the definition of industrial machinery according to 670.2
Modular Data Centers
- Flexible power cords and cable shall not be permitted for the connection of a modular data center to an external source of power according to 646.9(B)
Information Technology Rooms
- I., III., and VI. wiring methods are permitted for use as branch-circuit supply conductors installed under a raised floor in an information technology room according to 645.5(E)(1)
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Description
Test your knowledge on the National Electrical Code (NEC) regulations regarding special equipment, including permanently-installed swimming pools and fire pumps. This quiz covers essential rules and requirements from various NEC articles, ensuring safety in electrical installations. See how well you understand the guidelines!
