23
Connection
Wiring
The connection to the supply voltage shall be fi tted with short-circuit protective
devices in accordance with IEC 60364-4-473 (a 6 A fuse is recommended).
Devices for protection against short-circuit according to IEC 60364-4-473 for the
system coupling can be omitted if the wiring is carried out in such a manner
as to reduce the risk of a short-circuit to a minimum (a short-circuit-proof and
earth-fault-proof wiring is recommended).
The terminals are protected with the enclosed terminal covers.
The test and reset button of several devices must not be connected in parallel
(collective testing of several insulation monitoring devices).
External coupling devices connected via the terminal AK, cannot be disconnec-
ted via the internal coupling relays.
System disconnection
The system can be disconnected from the IT system using a hardware function
which can be activated via the function input F1/F2 or via the interface. The
coupling circuits L1 and L2 are opened via high voltage relays (2.5 kV AC) and
in this way the conductive connection to the IT system will be disconnected. If
this function has been activated, the message „STANDBY“ is indicated on the
display. This function is required for interconnected IT systems in insulation
fault location systems.
B
B
B
B
B
B
B
B
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