Guide for the application of electric motors in Class I Division 2 hazardous (classified) locations

Abstract

This paper presents an overview of IEEE 1349-2001, a Guide that assists individuals, organizations, and suppliers with the application of motors in Class 1, Division 2 locations, where flammable gases and vapors may occasionally be present. Three-phase and single-phase AC synchronous and induction electric motors in sizes from fractional horsepower and larger are covered in the Guide. Primary emphasis is on the use of general-purpose enclosures and precautions against excessive surface temperatures and sparking of rotor bars and enclosure joints. The Guide also provides guidance for maintaining the life-cycle integrity of motors in Division 2 locations. Existing codes and standards, such as the National Electrical Code (NEC), contain cautionary notes for general-purpose motor applications in Division 2 areas. This Guide documents industry experience and established practices for the application of general-purpose motors in Division 2 locations and provides guidance for applying motors in these locations. It is not a specification and is not intended to be used as a specification for purchasing motors installed in Division 2 locations. This paper does not replace the Guide, but should be used to supplement and understand the Guide. Significant motor temperature information is contained in the Guide including maximum recommended Division 2 exposed surface temperatures at full load. Manufacturers, users, and other industry experts worked about 8 years to develop this consensus standard. It was approved by the IEEE-SA Standards Board in December of 2001 and published in June of 2002.