41
If a residual current protective device for other protection tasks (fault protection,
re protection) is connected upstream of an RCD for additional protection (rated
residual current ≤ 30 mA), this second RCD should always have a selective tripping
characteristic (e.g. Type
S
).
As shown in table 5, selective and standard residual current protective devices
achieve the maximum permissible tripping times in both power supply systems.
The following points must be noted when residual current protective devices are
used in Germany for fault protection, re protection and (in accordance with
DIN VDE 0100-530) additional protection:
• All poles of all active conductors – i.e. including the neutral conductor – must
always be disconnected.
• Only voltage-independent residual current protective devices (Type A) are
allowed.
• Purely AC-sensitive residual current protective devices (Type AC) are not
allowed.
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