Line Operated Three Phase a.c. Motors ( IE CODE ) “Efficiency Classes and Performance Specification"

This Indian Standard (Third Revision) was adopted by the Bureau of Indian Standards, after the draft finalized by the Rotating Machinery Sectional Committee had been approved by the Electrotechnical Division Council.

This standard specifies the performance requirements and efficiency classes (IE Code) of line operated three phase a.c. motors.

This standard was originally published in 1989 and subsequently revised in 2004 and 2011. First revision was brought to include eff2 and eff1 classes, and the second revision was brought to include IE1, IE2 and IE3 efficiency classes. The third revision of this standard has been undertaken to align it with the latest version of IEC 60034-30-1 : 2014 ‘Rotating electrical machines — Part 30-1: Efficiency classes of line operated a.c. motors (IE Code), to the extent possible, for efficiency classes.

The references for methods of testing have been referred from IS 15999 (Part 2/Sec 1) : 2011 ‘Rotating electrical machines — Part 2-1: Standard methods for determining losses and efficiency from tests (excluding machines for traction vehicles)’. This standard replaces IS 12615 : 2011 including all of its amendments.

Electric motors are the most important type of electric load in every industry. The motor driven systems account for about seventy percent of the energy consumed by the industry. There is a large potential for cost effective solution in the use of energy efficient motor systems by about twenty to thirty percent. Electric motor systems include a number of energy using products, such as motors, drives, pumps or fans, compressors, blowers and other machines. Energy efficient motors form a major component in contributing to the energy saving by way of increased efficiency of the product itself. Further, with the different test methods specified in different standards, one to one comparison becomes difficult for the buyer or the end user. Therefore, a need was felt globally to harmonize the motor standards with the international standards so as to have uniform test procedures to facilitate the end user to compare the performance and energy efficiency requirements.