Siemens SIMOTICS TN 1LL8, Operating & Installation Instructions Manual

Page: 78 / 148

6.4.10 Minimum air clearances
After proper installation, verify that the minimum air clearances between non-insulated parts
are maintained. Be aware of any protruding wire ends.
Table 6-6 Minimum air clearance dependent on rms value of the alternating voltage U
rms
Rms value of the alternating voltage V
rms
Minimum air clearance
≤ 500 V 8 mm
≤ 630 V 10 mm
≤ 800 V 12 mm
≤ 1000 V 14 mm
≤ 1250 V 18 mm
Values apply at an installation altitude of up to 2000 m.
When determining the required minimum air clearance, the voltage value in the table may be increased
by a factor of 1.1, so that the rated input voltage range is taken into account during general use.
6.4.11 Finishing connection work
1. Before closing the terminal box, please check that:
– The electrical connections in the terminal box have been made in accordance with the
specifications above and tightened with the correct tightening torque.
Remove the used bolts and fastening elements.
– The machine is connected in such a way that it rotates in the direction specified.
– The inside of the terminal box is clean and free of any cable debris, dirt and foreign
bodies.
– All of the seals and sealing surfaces of the terminal box are intact and in a good condition.
– Unused cable entries are closed and their plugs are tightly screwed in place, i.e. they
can only be released using a tool.
– The connecting cables are freely routed. The cable insulation cannot be damaged in
operation.
2. Close the terminal box using the cover fixing screws, see Chapter Tightening torques for
screw connections. (Page 139)
Electrical connection
6.4 Introducing and routing the cables
SIMOTICS TN Series N-compact 1LL8
78
Operating Instructions 11/2018