I, Zone 2 Hazardous (Classified) Locations: Type of Protection "n."
Unclassified Locations. Locations determined to be neither Class I, Division 1; Class I, Division 2; Class I, Zone 0; Class I, Zone 1; Class I, Zone 2; Class II, Division
1; Class II, Division 2; Class III, Division 1; Class III, Division 2; or any combination thereof.
505.3 Other Articles. All other applicable rules contained in this Code shall apply to electrical equipment and wiring installed in hazardous (classified) locations.
Exception: As modified by Article 504 and this article.
505.4 General.
(A) Documentation for Industrial Occupancies. All ar eas in industrial occupancies designated as hazardous (clas
sified) locations shall be properly documented. This docu
mentation shall be available to those authorized to design,
install, inspect, maintain, or operate electrical equipment at the location.
FPN: For examples of area classification drawings, see ANSI/API RP 505-1997, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone I, or Zone 2; ANSI/ISA-TR (12.24.01)-1998 (IEC 60079-10 Mod), Recommended Practice for Classification of Locations for Electrical Installations Classified as Class I, Zone 0, Zone I, or Zone 2; EC 60079-10-1995, Electrical Apparatus for Explosive Gas Atmospheres, Classification of Hazardous Areas; and Model Code of Safe Practice in the Petroleum Industry, Part 15: Area Classification Code for Petroleum Installations, IP 15, The Institute of Petroleum, London.
(B) Reference Standards. Important information relating to topics covered in Chapter 5 may be found in other publications.
FPN No. 1: It is important that the authority having jurisdiction be familiar with recorded industrial experience as well as with standards of the National Fire Protection Association (NFPA), the American Petroleum Institute (API), the Instrumentation, Systems, and Automation Society (ISA), and the International Electrotechnical Commission (IEC) that may be of use in the classification of various locations, the determination of adequate ventilation, and the protection against static electricity and lightning hazards.
FPN No. 2: For further information on the classification of locations, see ANSI/API RP 505-
1997, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone I, or Zone 2; ANSI/ISA-TR (12.24.01)-1998 (IEC 60079-10
Mod), Recommended Practice for Classification of Locations for Electrical Installations Classified as Class I, Zone 0, Zone I, or Zone 2; IEC 60079-10-
1995, Electrical Apparatus for Explosive Gas
Atmospheres, Classification of Hazardous Areas;
and Model Code of Safe Practice in the Petroleum
Industry, Part 15: Area Classification Code for
Petroleum Installations, IP 15, The Institute of
Petroleum, London.
FPN No. 3: For further information on protection against static electricity and lightning hazards in hazardous (classified) locations, see NFPA 77-2007, Recommended Practice on Static Electricity; NFPA
780-2004, Standard for the Installation of Lightning
Protection Systems; and API RP 2003-1998,
Protection Against Ignitions Arising Out of Static
Lightning and Stray Currents.
FPN No. 4: For further information on ventilation, see NFPA 30-2007, Flammable and Combustible Liquids Code, and ANSI/API RP 505-1997, Recommended Practice for Classification of Locations for Electrical Installations at Petroleum Facilities Classified as Class I, Zone 0, Zone I,