What Electrical Interference Occurs And How Is It Handled - Siemens SENTRON Manual
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- Manual (224 pages) ,
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Notes on installation and use
Fire protection with a rated residual current of I
In installations
• at particular risk of fire (premises exposed to fire hazards),
• that are primarily made of flammable construction materials,
• containing irreplaceable goods of great value
the installation of RCCBs 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 mineral-insulated cables and
busbar systems are used.
Type B+ residual current protective devices must be used in the above-mentioned
systems to increase the preventative fire protection of electrical equipment with
input circuits 8 through 13 (see Table 1).
5.2.3
What electrical interference occurs and how is it handled?
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.
For problem-free use of RCCBs in practical applications, the stationary leakage
current should be ≤ 0.3 * I
50
.
∆n
≤ 300 mA
∆n
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