ABB hd4 Installation And Service Instructions Manual page 15

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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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