Connecting Cables Without Cable Lugs - Siemens SIMOTICS FD 1MH1 Operating Instructions & Installation Instructions

Electrical connection
6.5 Inserting and routing the cables
Explosion hazard if cable lugs without side guards are used
For cable cross-sections under 70 mm
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
● Make sure that the minimum air clearances (Page 100) 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 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
● Insert only one conductor end into each terminal.
Procedure
Ensure that the minimum air clearances and the creepage distance 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
3. Insulate the conductor ends in such a way that the remaining insulation reaches almost up
96
WARNING
correctly.
The clips of the 1XB7730/1XB7731 terminal boxes can accept cables with maximum
185 mm² cross-section.
forces are acting on the cable connection.
to the cable lug.
, cable lugs without side guard may twist. The
2
, use only cable lugs with side guard.
2
SIMOTICS FD 1MH1
Operating Instructions 08/2017