This part of IEC 61000 describes the electromagnetic environment with respect to the
voltages in excess of normal that are found on electricity supply networks operating at low
and medium nominal voltages and that can be impressed on equipment connected to those
networks, without considering further effects (e.g. amplification or attenuation) within an
installation. Since these overvoltages have the potential to hinder the functioning of electrical
and electronic equipment, they fall within the definition of electromagnetic disturbance in the
field of EMC. Various categories of overvoltage are described, based on relative magnitude,
duration and energy content.
This Technical Report describes the phenomena of overvoltages, it does not specify
compatibility levels and does not directly specify emission and immunity levels.
The report describes the various phenomena and processes that cause overvoltages,
including the transfer into the networks concerned of overvoltages that originate in or traverse
other networks and installations, including higher voltage networks and the installations of
electricity users. The effects of overvoltages on equipment are outlined. Some case studies of
overvoltage events are presented.
Recommendations are made regarding the general technical approach to mitigating the risk of
equipment being hindered from operating as intended by the effects of overvoltages. (It is not
the function of IEC publications to assign responsibility for mitigating measures to any of the
parties involved.)
The purpose of this report is to ensure that this important category of electromagnetic
disturbance is included in the description of the environment in Part 2 of IEC 61000. For that
purpose, only a brief description is provided of the various overvoltages and their causes and
effects. A much more detailed treatment can be found in IEC 62066. A UIE publication –
Guide to quality of electrical supply for industrial installations, Part VI: Transient and
temporary overvoltages and currents – has a similar content. Measurement methods are
specified in IEC 61000-4-30.
NOTE This Technical Report does not include detailed measurement results for overvoltages, therefore it is not
possible to provide an assessment of the probability of occurrence.