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Always use two wrenches (so not strain the insulating parts excessively), applying the tightening torque indicated Fig.
Fig.2 arthing
The fixed circuit-breaker and the fixed part the withdrawable circuit-breaker have one two terminals the rear, marked with the special
symbol, for connection earth (Fig. s
fo l
E3 3
E6 6
Fig.
Before assembling the connection, clean and degrease the area around the screw.
When aluminium connections are used, advisable apply thin layer Vaseline over the contact surfaces.
11/108
. 18
5. conductor with cross-section conforming current standards must used
for the connection.1.Check the state the contact surfaces the connections very carefully: they must very clean with burrs, dents traces rust which must
be eliminated using fine file emery cloth prevent localized increases temperature. and Fig.
Always insert large-diameter flat washer and spring washer between them (to spread the tightening pressure over greater area).
Each terminal complete with bolt for fixing the connection.
After the assembly, tighten the bolt with torque Nm.
Make the contact between connection and terminal and tighten the fixing screws completely.
The terminal box immediately accessible when the compartment door open.
The connections must not exert any strain the terminals any direction.
The terminal box identified code the electrical circuit diagram. completion the operation, remove all traces
of grease dust with cloth soaked suitable solvent.
5. Check tightness
after hours.1 Interfacing elements for fixed circuit-breakers
A special terminal box provided, fitted with screw terminals for connecting the auxiliary circuits.
The terminals are marked with alphanumerical identification codes for the electrical circuit diagram. scre s
fo l
E2 2
E4 4
No. 12).3.3 iring circu it-b xilia circu its
5.
5. 19
Model 3447
A pparatus Emax DC
S cale
D 1SDH000635R0002
Page No.2 Assembly procedure for the connection busbars
M12 high strength screws
Tightening torque the main terminals: Nm
No. When copper connections are used, advisable tin-plate the contact surfaces. 18
