Siemens SIMOTICS TN 1LL8, Operating & Installation Instructions Manual

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5. Place the cable lug on the terminal support. If you are using a disconnecting link, check its
positioning.
For terminal boxes 1XB7740 and 1XB7750, place the cable lug on the busbar.
6. Tighten the fixing element
②
with the corresponding tightening torque:
Fixing element Tightening torque
Fastening screw M12 20 Nm
Fixing screws M16 40 Nm
Fixing nuts M12 20 Nm
6.4.5 Connection without cable lugs
Lug terminal connections - which are suitable for connecting flexible and stranded conductors
without the use of wire end ferrules - may be installed if ordered accordingly. If you wish to
use wire end ferrules, then before connecting the cable, attach these so as to form a technically
correct, current-carrying crimped joint at the end of the conductor.
NOTICE
Overheating of the conductor ends
If the end of the conductor is not correctly enclosed by the wire end ferrule, but is trapped by
it, this can lead to overheating.
● Insert only one conductor end into each wire end ferrule, and attach the wire end ferrule
correctly.
● Insert only one conductor end into each terminal.
Procedure
Ensure that the minimum air clearances of 10 mm and the creepage distance of 20 mm are
maintained for the connection.
1. Open the terminal box and cut the cable to the correct length.
2. Prepare the end of the cable depending on the cable and its use. Make sure that no external
forces are acting on the cable connection.
3. Insulate the conductor ends in such a way that the remaining insulation reaches almost up
to the cable lug.
Electrical connection
6.4 Introducing and routing the cables
SIMOTICS TN Series N-compact 1LL8
Operating Instructions 11/2018
75