IEEE 1349 Guide for the application of motors in hazardous (classified) locations; What'S new

This paper presents an overview of IEEE 1349-2011 [1], 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 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 [2] 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 (non-destructive), and includes documented events since 2001. Manufacturers, users, and other industry experts worked about 6 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.