National Electric Code
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647-Sensitive Electronic Equipment
647.1 Scope. This article covers the installation and wiring of separately derived systems operating at 120 volts line-to-line and 60 volts to ground for sensitive electronic equipment.
647.3 General. Use of a separately derived 120-volt single-phase 3-wire system with 60 volts on each of two ungrounded conductors to a grounded neutral conductor shall be permitted for the purpose of reducing objectionable noise in sensitive electronic equipment locations, provided the following conditions apply:
510-Hazardous _Classified_ Locations-Specific
510.1 Scope. Articles 511 through 517 cover occupancies or parts of occupancies that are or may be hazardous because of atmospheric concentrations of flammable liquids, gases, or vapors, or because of deposits or accumulations of materials that may be readily ignitible.
551-Recreational Vehicles and Recreational Vehicle Parks
ARTICLE 551
Recreational Vehicles and Recreational
Vehicle Parks
I. General
551.1 Scope. The provisions of this article cover the electrical conductors and equipment other than low- voltage and automotive vehicle circuits or extensions thereof, installed within or on recreational vehicles, the conductors that connect recreational vehicles to a supply of electricity, and the installation of equipment and devices related to electrical installations within a recreational vehicle park.
650-Pipe Organs
650.1 Scope. This article covers those electrical circuits and parts of electrically operated pipe organs that are employed for the control of the sounding apparatus and keyboards.
650.3 Other Articles. Electronic organs shall comply with the appropriate provisions of Article 640.
511-Commercial Garages, Repair and Storage
FPN: Rules that are followed by a reference in brackets contain text that has been extracted from NFPA 30A-
2008, Code for Motor Fuel Dispensing Facilities and Repair Garages. Only editorial changes were made to the extracted text to make it consistent with this Code.
552-Park Trailers
I. General
(3) Marking. All insulated low-voltage conductors shall be surface marked at intervals not greater than 1.2 m (4 ft) as follows:
(1) Listed conductors shall be marked as required by the listing agency.
(2) SAE conductors shall be marked with the name or logo of the manufacturer, specification designation, and wire gauge.
(3) Other conductors shall be marked with the name or
660-X-Ray Equipment
660.4 Connection to Supply Circuit.
I. General
(A) Fixed and Stationary Equipment. Fixed and stationary X-ray equipment shall be connected to the power supply by means of a wiring method meeting the general requirements of this Code. Equipment properly supplied by a branch circuit rated at not over
30 amperes shall be permitted to be supplied through a
suitable attachment plug cap and hard-service cable or
cord.
445-Generators
445.1 Scope. This article covers the installation of gen- erators.
445.10 Location. Generators shall be of a type suitable for the locations in which they are installed. They shall also meet the requirements for motors in 430.14.