Existing codes and standards contain cautionary notes for open or nonexplosionproof or nonflameproof enclosed motors in Class I, Division 2 and Class I, Zone 2 locations as covered in NFPA 70 (National Electrical Code). The IEEE 1349 Working Group developed and updates a Guide that documents industry experience and established practices and provides guidance for applying motors in these locations. The scope includes three-phase and single-phase AC synchronous and induction electric motors in fractional ratings 0.18 kW (1/4 hp) and larger are covered in this Guide. Primary emphasis is on the use of open or nonexplosionproof or nonflameproof enclosed motors in Class I, Division 2 and Class I, Zone 2 locations as covered in NFPA 70. Precautions against excessive surface temperatures and sparking of rotor bars and enclosure joints are also covered. This document also provides guidance for maintaining the life-cycle integrity of motors in Class I, Division 2 and Class I, Zone 2 locations as covered in NFPA 70. This Guide does not cover AC wound rotor motors and DC electric motors. Motors installed in locations other than Class I, Division 2 and Class I, Zone 2 as covered in NFPA 70 are not covered in this Guide. This document is not a specification and is not intended to be used as a specification for purchasing motors. The voltage breaks in this document are 1000 V and less, and over 1000 V.
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