ABB Vmax - Page 17

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4.5.5. Connection of the auxiliary circuits
Note: the minimum cross-section of the wires used for the
auxiliary circuits must not be less than the one used for the
internal cabling AWG16. Furthermore, they must be insulated
for 3 kV test.
Please note that auxiliary circuits must be energized with 2 kV
(maximum test voltage) as per standards indications.
Connection of the auxiliary circuit
for Vmax Fixed circuit-breaker
Connection of the circuit-breaker auxiliary circuits must be
made by means of the proper terminal box mounted inside
the circuit-breaker and the wires must pass through the
connector (1) (Fig. 8). Outside the connector, the cables must
pass through a suitable metal protective covering (pipe, wiring
duct, etc.) and be earthed.
To prevent the cabling wires outside the circuit-breaker
(provided by the customer) from accidentally coming into
contact with moving partsand therefore damaging the
insulation, the wires should be positioned and fixed as shown
in the figure 8.
Before removing the operating mechanism cover (1)
(Fig. 9) to access the terminal box, check that the circuit-
breaker is open and the closing springs discharged.
Fig. 8
4.5.6. Withdrawable circuit-breakers
The auxiliary circuits of withdrawable circuit-breakers are fully
cabled in the factory as far as the connector (2 - fig. 9).
For the external connections, refer to the electric wiring
diagram of the switchgear.
Fig. 9