What are the threshold levels of the motor efficiency
classes?
Table 1 above shows the threshold levels of the motor
efficiency classes for 2, 4, 6 and 8 pole motors between
0.12 and 1000 kW at 50 Hz.
How is the IE class marked?
The lowest efficiency value and the associated IE-code of the
motor are shown on the rating plate.
How is IEC/EN 60034-30-1 compatible with other
efficiency standards?
Differences still exist between the various standards. The IEC
standard harmonizes the currently different requirements for
induction motor efficiency levels around the world, however,
making the comparison easier. Work to harmonize standards
continues.
Table 2 below shows a rough comparison between
IEC/EN 60034-30-1 and main national MEPS schemes world
wide.
The IEC/EN 60034-30-1 defines only the requirements
for the efficiency classes and aims to create a basis for
International consistency. It does not specify which motors
must be supplied with which efficiency level. This is left to
the respective regional legislation and EU Directive. Each
country will be advised to adopt the minimum efficiency
levels compatible with the EU Directive as a way to assure
availability of the most efficient motors for users.