ABB hd4 Installation And Service Instructions Manual page 15

7.7. Earthing
For fixed version circuit-breakers, use the screw marked with
the relative symbol to effect the earthing.
Clean and degrease the surrounding area for a diameter of
about 30 mm. After completion of the assembly, cover the
entire joint with vaseline.
Use a conductor (busbar or braid) with a cross-section as
indicated in the Standards in force.
7.8. Auxiliary circuit connection
Notes
– The minimum cross-section of the wires used for the
auxiliary circuits must not be less than that used for
internal wirings.
– Before carrying out the connection of the auxiliary
circuits, it is advisable to check the selected type of
automatism provided for operation of the pressure
switch (if provided) referring to the latest technical
documentation supplied by ABB.
7.8.1. Fixed circuit-breaker
The connection of the circuit-breaker auxiliary circuits must
be made via the terminal box mounted on the circuit-breaker
structure.
Outside the circuit-breaker the wires must run inside
appropriately earthed metal tubes or ducts.
Before removing the operating mechanism cover
to access the terminal box, make sure that the
circuit-breaker is open and the closing springs
discharged.
7.8.2. Withdrawable circuit-breaker
The auxiliary circuits of the withdrawable circuit-breaker are
fully cabled in the factory as far as the connector. For the
external connections, please refer to the electric diagram of
the enclosure or of the switchgear.
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