ABB Uniswitch Operation And Maintenance Manual page 22

References
ABB
Uniswitc h Operation and
Maintenanc e Manual
Figure 3.10
Operating and interlocking mechanism of earthing switch type EM.
The earthing switch (46.1) (Figure 3.2) can only be switched on if the
withdrawable part is in the test/disconnected position or outside of the
cubicle (mechanical interlock) (61.3 and 61.4).
If the earthing switch is on, the withdrawable part cannot be moved from
the test/disconnected position to the service position (mechanical
interlock).
Details of other possible interlocks, e.g. in connection with a locking
magnet on the withdrawable part and/or earthing switch drive, can be
obtained from the relevant order documents.
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UNI S14GB 05-02