2008
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503-Class DDE Locations
I. General
control drawing^). Simple apparatus, not shown on the control drawing, shall be permitted in a nonincendive field wiring circuit, provided the simple apparatus does not interconnect the nonincendive field wiring circuit to any other circuit.
FPN: Simple apparatus is defined in 504.2.
540-Motion Picture Projection Rooms
I. General
540.1 Scope. The provisions of this article apply to motion picture projection rooms, motion picture projectors, and associated equipment of the professional and nonprofessional types using incandescent, carbon arc, xenon, or other light
source equipment that develops hazardous gases, dust, or radiation.
FPN: For further information, see NFPA 40-2007, Standard for the Storage and Handling of Cellulose Nitrate Film.
630-Electric Welders
I. General
considers both the magnitude and the duration of the load while the welder is in use.
504-Intrinsically Safe Systems
504.1 Scope. This article covers the installation of intrinsically safe (I.S.) apparatus, wiring, and systems for Class I, II, and III locations.
FPN: For further information, see ANSWSA-RP 12.06.01-
2003, Wiring Methods for Hazardous (Classified)
Locations Instrumentation — Part I: Intrinsic Safety.
545-Manufactured Buildings
disconnecting means conductors.
545.1 Scope. This article covers requirements for a manufactured building and building components as herein defined.
545.2 Definitions.
640-Audio Signal Processing, Amplification,and Reproduction Equipment
I. General
640.1 Scope. This article covers equipment and wiring for audio signal generation, recording, processing, amplification and reproduction; distribution of sound; public address; speech input systems; temporary audio system installations; and electronic organs or other electronic musical instruments. This also includes audio systems subject to Article 517, Part VI, and Articles 518,
520, 525, and 530.
505-Class I,Zone 0,1, and 2 Locations
FPN: Rules that are followed by a reference in brackets contain text that has been extracted from NFPA 497-
2004, Recommended Practice for the Classification of
Flammable Liquids, Gases, or Vapors and of Hazardous
(Classified) Locations for Electrical Installations in
Chemical Process Areas. Only editorial changes were
made to the extracted text to make it consistent
with this Code.
547-Agricultural Buildings
547.1 Scope. The provisions of this article shall apply to the following agricultural buildings or that part of a building or adjacent areas of similar or like nature as specified in 547.1(A) and (B).
(A) Excessive Dust and Dust with Water. Agricultural buildings where excessive dust and dust with water may accumulate, including all areas of poultry, livestock, and fish confinement systems, where litter dust or feed dust, including mineral feed particles, may accumulate.
645-Information Technology Equipment
645.1 Scope. This article covers equipment, power- supply wiring, equipment interconnecting wiring, and grounding of information technology equipment and systems, including terminal units, in an information technology equipment room.
FPN: For further information, see NFPA 75-2003, Stan- dard for the Protection of Information Technology Equipment.