Siemens 3TM Manual de Instruções - Página 28

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1. Circuit Diagrams

Installation

Fig. 23

Mounting points

Connecting to earthing on

the customer's premises

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

Base plate

Earthing connection

9229 0098 176 0-

2019-01-09