IEEE 1349 Guide for the Application of Motors in Hazardous (Classified) Locations: What´s New

This paper presents an overview of IEEE 1349-2011, a guide that assists individuals, organizations, and suppliers with the application of motors in Class I, Division 2 and Class I, Zone 2 locations, where flammable gases and vapors may occasionally be present. AC synchronous and induction motors in ratings of 0.18 kW (1/4 hp) and larger are covered. 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 70-2011. Precautions against excessive surface temperatures and sparking are included. To mitigate hot surface temperatures and sparking, this document provides guidance for selecting, operating, and maintaining motors. IEEE 1349-2001 included Class I, Division 2 applications, and IEEE 1349-2011 was expanded to cover Class I, Zone 2 applications. The new release updates guidance, adds new motor temperature test data submitted by manufacturers and users, expands adjustable speed drive (ASD) application information including a Common ASD section and common-mode voltage calculation method, details additional test methods for determining motor rotor temperature (nondestructive), and includes documented events since 2001. Manufacturers, users, and other industry experts worked about six years to update this consensus standard. This paper does not replace the guide but should be used to supplement and understand the guide, providing examples and highlighting new information.