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5.1.3.
Assembly procedure for the connection busbars
Check the state of the contact surfaces of the connections very carefully: they must be very clean with no burrs, dents or traces
of rust which must be eliminated using a fi ne fi le or an emery cloth to prevent localized increases in temperature. On completion
of the operation, remove all traces of grease or dust with a cloth soaked in a suitable solvent. When alluminium connections the
contact surfaces must be tinned.
The connections must not exert any strain on the terminals in any direction.
Always insert a large-diameter fl at washer and a spring washer between them (to spread the tightening pressure over a greater area).
Make the contact between connection and terminal and tighten the fi xing screws completely.
Always use two wrenches (so as not to strain the insulating parts excessively), applying the tightening torque indicated in Fig.
18. Check tightness after 24 hours.
M12 high strength screws
Tightening torque of the main terminals: 70 Nm
Fixed part terminals
Fig. 18
5.2. Earthing
The fi xed circuit-breaker and the fi xed part of the withdrawable circuit-breaker have one or two terminals on the rear, marked with
the special symbol, for connection to earth (Fig. 9 and Fig. 12).
Each terminal is complete with a bolt for fi xing the connection. A conductor with a cross-section conforming to current standards
must be used for the connection.
Before assembling the connection, clean and degrease the area around the screw.
After the assembly, tighten the bolt with a torque of 70 Nm.
5.3. Wiring the circuit-breaker auxiliary circuits
5.3.1.
Interfacing elements for fi xed circuit-breakers
A special terminal box is provided, fi tted with screw terminals for connecting the auxiliary circuits.
The terminals are marked with alphanumerical identifi cation codes as for the electrical circuit diagram.
The terminal box is identifi ed by code XV on the electrical circuit diagram.
The terminal box is immediately accessible when the compartment door is open.
Fig. 19
Model
L6555
No. of screws
No. of screws
for neutral
for phase
2
2
3
3
4
2
4
4
6
3
6
6
XV
Fixed circuit-breaker terminals
Apparatus
Doc. No
1SDH000460R0002
No. of screws
No. of screws
for neutral
for phase
2
2
3
3
4
2
4
4
6
3
6
6
Scale
Emax
Page No
11/74
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