Comparison of IEC and NEMA Requirements to Ensure Proper Specification and Design of Induction Motors & Generators for Global use-part 2: Copyright Material IEEE, Paper No. PCIC-2017-04

In recent years, there has been considerable alignment between the National Electrical Manufacturers Association (NEMA),[1] Institute of Electrical and Electronics Engineers (IEEE), and International Electrotechnical Commission (IEC) Although these standards have largely converged, many differences remain, and, in today's global market, it is important to understand these differences. Our first paper, entitled “Comparison of IEC and NEMA Requirements to Ensure Proper Specification and Design of Induction Motors and Generators for Global Use”,[4] was presented at the Petroleum and Chemical Industry Committee (PCIC) 2017 in Calgary, and focused on the basic performance requirements, mostly covering IEC 60034-1,[2] but also included additional appropriate requirements of critical performance components of 60034-2 [3] through 60034-31. The remainder of the standards are so wide and extensive it was impossible to properly cover them in one paper. Those topics were not covered to their fullest extent and, therefore, will be addressed here, including factory testing, vibration, starting performance, winding impulse and surge capability, efficiency, mounting dimensions, and hazardous area classification. As hazardous area classification comes closer to the division and zone classifications, it is important to understand the remaining differences between the National Electrical Code (NEC) and IEC 60079-7.