Siemens SIMOTICS FD 1MQ1, Operating And Installation Instructions

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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
Note
You can find more information in Chapter 2 of catalog D81.8.
WARNING
Explosion hazard if cable lugs without side guards are used
For cable cross-sections under 70 mm
2
, cable lugs without side guard may twist. The
minimum air clearances may be underrun and cause an explosion.
This can result in death, serious injury, or material damage.
● For cable cross-sections under 70 mm
2
, use only cable lugs with side guard.
● Make sure that the minimum air clearances (Page 88) are observed.
6.5.6 Connecting cables 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
conductor end sleeves, then correctly crimp these onto the end of the conductor before
connecting up.
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.
Electrical connection
6.5 Inserting and routing the cables
SIMOTICS FD 1MQ1
84
Operating Instructions 01/2019