Assembly Procedures For The Connection Busbars; Wiring Of The Auxiliary Circuits Of The Circuit-Breaker - ABB Tmax T8 L5757 Instructions For Installation And Service

Positioning the fi rst anchor plate of the busbars
Anchoring to the switchboard
Fig. 11
5.2.3

Assembly procedures for the connection busbars

Check the state of the contact surfaces of the connections very carefully: they must be very clean and free from burrs, dents and traces of rust
- which must be removed with a fi ne fi le or emery cloth to prevent localized increases in temperature. On completion of the operation, remove
any traces of grease or dust with a cloth soaked in a suitable solvent.
When aluminium connections are used, the contact surfaces must be tin-plated.
Make sure that the connections are unable to exert any strain on the terminals in any direction.
Always insert a fl at washer with a large diameter (to distribute the tightening pressure over the widest possible area) and a spring washer.
Establish contact between the connection and terminal and fully tighten the fi xing screws.
Always use two wrenches (to prevent the insulating parts from being unduly stressed) and apply the tightening torque of the main terminals = 70
Nm/615 lb in for M12 high-strength screws. Check tightness after 24 hours.
5.2

Wiring of the auxiliary circuits of the circuit-breaker

There is a special terminal board fi tted with screw terminals for connecting the auxiliary circuits.
The terminals are marked with alphanumerical identifi cation codes as indicated in the electrical circuit diagram.
The terminal board is identifi ed by the letters XV on the electrical circuit diagram.
The terminal board is accessed immediately when the compartment door is opened.
Fig. 12
Mod. L3692
L3885
190
7.48"
190
7.48"
190
190
7.48"
7.48"
190
7.48"
XV
L5757
190
7.48"
Apparatus
Doc N°
190
7.48"
Tmax T8
1SDH000682R0002
Scale
Page N°
8/39