1 Scope and object
This section of IEC 870‑2 applies to telecontrol equipment and systems with coded bit serial data transmission
for monitoring and control of geographically widespread processes.
It is also a reference document for teleprotection equipment and systems and for equipment
included in a distribution line carrier (DLC) system supporting a distribution automation
system (DAS).
This standard specifies, with reference to the various components of the systems defined
above:
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1) the characteristics of the power supply to which these components are connected during the normal operation;
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2) the EMC minimum requirements, expressed in terms of immunity and emission test levels.
With reference to EMC, the test levels have been selected among the classes established
by the IEC basic publications on EMC, taking into account the particular environmental
conditions under which the various types of equipment considered by this section operate;
test procedures, test circuits and acceptance criteria are briefly indicated, making
reference for detailed information to the IEC basic publications on the various subjects;
reference is also made to basic publications on protection techniques and installation
practices.