Switching On/Off The Earthing Switch; Earthing Busbar/Cable Using Withdrawable Earthing Unit - Eaton Power Xpert UX 12 User Manual

System operation
Door Interlock Defeat Mechanism: To open the cable
door in an emergency, remove two screws.
4.3.3

Switching on/off the earthing switch

Switching on the earthing switch
1. Put the unit in the 'Insert/Removed' or 'Test' position;
2. Remove the padlock if fitted to the earth switch
operation mechanism and open the cover (1).
3. Press the interlock driver (2) down to reveal the
mechanism opening.
4. Insert the operating handle (3) through the opening
to engage the operating shaft of the earthing switch.
5. Turn the handle clockwise;
 The earthing switch switches On.
The position indicator indicates "I" (ON).

It is not possible to put a withdrawable unit

into the Service position with the earth
switch On.
6. Remove the operating handle (3).
7. The cover can now be closed, and if required a
padlock can fitted on the locking catch. The earth
switch is now padlocked in the "ON" position.
Switching off the earthing switch
1. Release all interlocks; if a padlock has been fitted,
remove it.
2. Place the operating handle (3) on the operating shaft
of the earthing switch.
3. Turn the handle anti-clockwise; release the interlock
driver.
The earthing switches are switched Off.

The position indicator indicates "O" (Off).

4. Remove the operating handle (3).
5. The interlock driver will return to its original position
and the cover can be closed and if required a
padlock can fitted on the locking catch. The earthing
switch is now padlocked in the "OFF" position
4.3.4 Earthing busbar/cable using
withdrawable earthing unit
Withdrawable busbar earthing unit only has the upper
movable contact fitted.
Withdrawable cable earthing unit only has the bottom
movable contact
Procedure for inserting the withdrawable earthing units is
as the same as for inserting withdrawable circuit breaker
unit to the Service position. For details, refer to 4.2.3
Procedure of unearthing busbar/cable is as the same to
withdrawing withdrawable circuit breaker unit to the
Insert/Removed position. For details, refer to 4.2.4
46
Power Xpert
NOTE
®
UX with W-VACi circuit breaker 6063308 G01 01 14 July 2011 www.eaton.com
Fig. 4-12 Interlock defeat mechanism screws
Fig. 4-13 Location of the operating shaft on a standard
built-in earthing switch
Fig. 4-14 Operating earth switch
1. Earth switch operating mechanism cover
2. Interlock Driver
3. Operating handle
1
2
3