Lenze MDxMA Three-phase AC motors ATEX 3D category - Manual (Page 8)

Electrical installation 3

8 BA 12.0031 EN 2.1
PE conductor connection
At the PE conductor connection in the terminal box and on the housing of the motor, the
PE conductor must be connected by placing a plain washer between cable lug and housing
of the motor. A serrated lock washer between cable lug and screw head / hexagon nut
ensures an electrically well-conductive connection. The following illustrations show the
correct connection for the different designs of the PE conductor connections:
1
2
3
4
Fig. 2 Earth connection at housing and in terminal box
1
Washer
2 Earth connection cable lug
3 Serrated lock washer
4 Screw
1
2
3
4
5 6
Fig. 3 Earth connection via terminal stud in terminal box
1
Terminal stud
2 Earth symbol
3 Washer
4 Earth connection cable lug
5 Serrated lock washer
6 Hexagon nut
Selection of cable gland
The threadedholesofthe terminal box are closedusinghigh-qualityscrewplugswithseal.
To insert the supply conductor in the terminal box, the corresponding screw plug is
replaced by a cable gland with strain relief. For this purpose, it is necessary to select a cable
gland that is certified for explosion protection and features at least enclosure IP54.
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