Siemens 3TM Manuale di istruzioni per l'uso - Pagina 28
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Installation
Fig. 23
Mounting points
Connecting to earthing on
the customer's premises
28
Due to the special shape of the mounting holes on the 3TM vacuum contactor , it is
possible to position it safely on loose, pre-assembled screws.
Mount the 3TM vacuum contactor tension-free and torsion-free at the four specified
mounting points (*) on a frame, wall, or on a withdrawable part.
Mounting screws M10, strength 8.8, tightening torque 48 Nm
*
Mounting points
**
Contact washer (SN 70093)
Earthing
Connect the earthing conductor on the earthing terminal (22) to the high-voltage pro-
tective earth as specified (DIN EN 50341).
Note
The base plate is provided with a protective layer. The earthing conductor must
be connected on the customer's premises with the use of a contact washer:
•
with spring steel serrations and
•
mechanically galvanized.
Only in this way is the protective layer reliably penetrated to the metal and contact
established.
Mount the contact washer (SN 70093), ring cable lug of the earthing conductor and
washer with the hexagonal bolt M12 (see Fig. 24) on the earthing terminal (22) and
tighten to 105 Nm.
Note
If the vacuum contactor is installed into an earthed metal frame and is connected
so it is permanently electrically conductive, no separate earthing is required.
In this case, place contact washers (SN 70093) under the screw heads when fas-
tening the vacuum contactor.
Fig. 24
Connecting the earthing conductor
2
Base plate
22
Earthing connection
9229 0098 176 0-
2019-01-09