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Useful Information from Everyday Practice
3.11
Questions on EMC
ElectroMagnetic
Compatibility
The major EMC standards ((ElectroMagnetic Compatibility) for EU conformity of compact
power supply units are listed in the following table.
In general, power supply units, which are provided with the CE conformity mark, must not
interfere with other devices in an unauthorized manner and must not be interfered with in
their function in an unauthorized manner by other devices. Noise emission is described in
the European standard EN 61000-6-3, noise immunity is defined in EN 61000-6-2.
Noise emission is divided into two classes: domestic sector (Part 1) and industrial sector
(Part 2). The domestic sector comprises all loads, which are connected to the public
medium voltage transformer. The industrial sector comprises all loads, which are
connected to the non-public medium voltage transformer.
Table 3-12
Major standards
Part 1: Domestic, Office and
Part 2: Industrial Sector
Commercial Sector
Noise Emission According to EN 61000-6-3
Housing
AC line supply current
Limit values for harmonic currents
Limit values for voltage
EN 60715, Class B
EN 60715, Class B
EN 55011, Class A
EN 55011, Class A
EN 61000-3-2
EN 61000-3-3
fluctuations (flicker)
Noise Immunity According to EN 61000-6-2
Electrostatic discharge (ESD)
Electromagnetic HF field
Fast transients (burst)
Surge current load
Conducted interference
Voltage fluctuations
EN 61000-4-2
EN 61000-4-3
EN 61000-4-4
EN 61000-4-5
EN 61000-4-6
EN 61000-4-11
EN 61000-6-2
Burst
Surge
For complying with the basic EMC standard EN 6100-6-2 a power supply unit must for
example have effective protective equipment against noise, e.g, lightning, burst, surge or
electrostatic discharge in the range of more than one kV.
Low-energy but quickly recurring (transient) interferences are known as "burst". These
interferences occur in welding systems but they are also caused by lightning strikes close
to electrical lines. The lightning bolt must not even directly strike the line. Inducing
electromagnetic fields in the lines will already lead to a voltage discharge.
High-energy and transient interferences are known as "surge". They occur in the form of
surge current loads, e.g., in the event of high load changes in the primary network. A short
circuit in the supply lines through the following fuse blowing causes a short and high current
load.
5598_en_03
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