What Electrical Interference Occurs And How Is It Handled; Leakage Currents - Siemens SENTRON Instructions Manual

Notes on installation and use
At frequencies higher than 100 Hz, protection in the event of indirect touching
must be provided and account must be taken of the frequency response of the
residual current operated circuit breaker, the maximum permissible touch voltage
(e.g. 50 V), the critical frequency components in the residual current and the
maximum permissible grounding resistance determined from these components
(see also Section 4.4.3).
• Fire protection with a rated residual current I
In installations
• at particular risk of fire (premises exposed to fire hazards),
• primarily made of flammable construction materials,
• containing irreplaceable goods of great value the installation
of residual current protection devices with rated residual currents of no more
than 300 mA is required in accordance with DIN VDE 0100-482 in connection with
DIN VDE 0100-530. Exceptions are only permitted if mineralized lines and busbar
systems are used.
Type B+ residual current protection devices must be used in the above-mentioned
systems to increase the preventative fire protection of electrical equipment with
input current circuits no. 8 through no. 13 (see table 1).
5.2.3

What electrical interference occurs and how is it handled?

5.2.3.1 Leakage currents

Leakage currents are currents that are leaked to ground although the insulation
is not faulty. They can be either static or dynamic, and they trip the RCCB if the
tripping value is exceeded.
These currents must therefore be taken into account when the rated residual
current I of an RCCB is selected and, if necessary, minimized, in order to ensure
Δn
that the specified protection requirements are met.
• Static leakage currents
Static leakage currents are continuously leaked to ground or the PE conductor
during normal operation of the load, even though the insulation is not faulty.
These currents are mainly leaked from line and filter capacitors.
44
≤ 300 mA:
Δn