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The connections must not exert any strain the terminals any direction.
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.3 irin circu it-b xiliary circu its
5.1 interfacing elem ents for fixed circuit-breakers
A special terminal box provided, fitted with screw terminals for connecting the auxiliary circuits. 12).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.3 Assem bly procedure for the connection busbars
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. completion the operation, remove all traces
of grease dust with cloth soaked suitable solvent. screw s
fo phase
|o olL
|o l
|0 |
3
S
No.
The terminals are marked with alphanumerical identification codes for the electrical circuit diagram. 18. screw s
fo phase
3
3
No. Check tightness
after hours.
After the assembly, tighten the bolt with torque Nm. and Fig. screw s
fo neutral
Fig.
M12 high strength screws
Tightening torque the main terminals: Nm
Fixed part terminals No. When copper connections are used, advisable tin-plate the contact surfaces.
Always use two wrenches (so not strain the insulating parts excessively), applying the tightening torque indicated Fig.3.5.
Make the contact between connection and terminal and tighten the fixing screws completely.
Fig.
Before assembling the connection, clean and degrease the area around the screw. conductor with cross-section conforming current standards must used
for the connection.
Each terminal complete with bolt for fixing the connection.
The terminal box immediately accessible when the compartment door open.
5.
Always insert large-diameter flat washer and spring washer between them (to spread the tightening pressure over greater area). screw s
fo neutral
Fixed circuit-breaker terminals
i° °ij-
i° °ij-
|Q OOOO°ljL
No.
When aluminium connections are used, advisable apply thin layer Vaseline over the contact surfaces.
The terminal box identified code the electrical circuit diagram.1. 19
Model L2234 Apparatus Scale
L 2778
Doc-Na 1SDH000460R0002
Page No. 18
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