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.
4. Make sure the terminal clamps ③, ④ are arranged correctly for the size of the conductor.
Insert the cable into the terminal clamps. Tighten the clamping nuts ⑤ to a tightening torque
of 8 Nm.
5. If you have loosened the terminal body clamping bolts ②, then retighten them to a torque
of 40 Nm.
For terminal box GT640, the fixing of the terminal element ① is done using a terminal nut
M12 on the threaded stud of the terminal support with a torque of 20 Nm.
Figure 6-8 Connection using terminal clamps (schematic diagram)
Electrical connection
6.4 Introducing and routing the cables
SIMOTICS TN Series N-compact 1LA8
80 Operating Instructions 08/2017
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