SV800/SV800A User Manual 4 Electrical wiring and precautions
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4.3 EMC
4.3.1 Definitions of related terms
EMC
：
EMC (Electromagnetic Compatibility) is the ability of electrical and electronic equipment to
work properly in an electromagnetic interference environment, also the ability not to release
electromagnetic interference to other devices or systems and make influence on the stabilize
working of other equipment.
Therefore, EMC includes two aspects:
Aspect 1: The electromagnetic interference caused by the device during normal operation
cannot exceed certain limits;
Aspect 2: The device must have sufficient immunity to the electromagnetic interference in the
environment, i.e. electromagnetic sensitivity.
First class environment:
The first environment includes civilian facilities. It also includes low-voltage power grids
facilities that are not directly connected through intermediate transformers and provide power to
civil buildings.
Second class environment:
The second environment includes all facilities other than those low-voltage supply networks
that directly connected to civil buildings.
C1 level Equipment:
The rated voltage of the electric drive system is less than 1000 V and used in the first
environment.
C2 level Equipment:
The rated voltage of the electric drive system is less than 1000 V and cannot be plug-in or
movable equipment. It can only be installed and commissioned by a professional when used in
the first environment.
C3 level Equipment:
The rated voltage of the electric drive system is less than 1000 V and is suitable for the second
environment and not for the first environment.
C4 level Equipment:
The rated voltage of the electric drive system is equal to or above 1000 V or the rated current is
equal to or above 400A, or use in a complex system of the second environment.
