The International Electrotechnical Commission (the IEC) developed the IE energy efficiency standard in order to confront the problem of nations having different standards for energy efficiency.
IE codes are a measurement tool for the efficiency class of motors. The new EN 60034-30:2009 gives the world a definition of the following efficiency classes of low-voltage three phase asynchronous motors in the power range from 0.75 kW to 375 kW.
• IE1 = Standard Efficiency (comparable to EFF2)
• IE2 = High Efficiency (comparable to EFF1)
• IE3 = Premium Efficiency
The old European designations EFF3, EFF2 and EFF1 will not become invalid, but will gradually disappear from the market.