1. VCB Cassette Switchgear DESCRIPTION AND GUIDE TO OPERATIONS
Areva PIX
VCB Cassette Switchgear
DESCRIPTION AND GUIDE TO OPERATIONS

2. Actions and Information
Red arrow/text indicates an instruction
Blue arrow/text indicates additional information
Definitions

3. INDEX SCREEN Click on the link to move to the required section
General description of the switchgear
Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Procedure to Earth a Busbar
Procedure to remove a Busbar Earth
Procedure to earth a circuit through a test cassette

4. GENERAL DESCRIPTION OF THE SWITCHGEAR
Definitions

5. FRONT PANELS
This illustration shows a typical PIX Feeder Circuit Breaker, comprising three main panels. The upper panel contains the protection equipment, controls and lamp indications. The centre panel comprises a door over the VCB cassette housing together with mechanical OPEN and CLOSE buttons (the CLOSE button is permanently disabled), facilities for VCB cassette racking and emergency mechanism manual charging. The lower panel is a removable door which covers the VT compartment (not all units are fitted with a VT). Note that although local operating facilities are provided, it is company policy to open and close Circuit Breakers remotely

6. UPPER PANEL
The upper panel contains the local/remote and CB trip/close rotary controls, together with CB ON, CB OFF, Trip Circuit Healthy and CB Tripped indicator lamps. An Areva M231 display unit is located at the centre of the panel whilst the protection relays are located at the top (layout of controls and indications varies)

7. CENTRE PANEL
The centre panel door contains a viewing window, allowing observation of the mechanical ON/OFF semaphore, operations counter and the mechanism spring condition indicator, all of which are located on the VCB cassette. This panel also contains the VCB cassette racking socket and the socket cover control, together with mechanical CLOSE and TRIP buttons (LOCAL CLOSE BUTTONS ARE INOPERATIVE!)

8. CENTRE PANEL WINDOW
The spring condition semaphore for the operating mechanism is located on the right hand side of the window. When the arrow points to the right, the mechanism spring is charged. A charged mechanism has enough energy for one CLOSE and one OPEN operation

9. CENTRE PANEL WINDOW
The same window also allows viewing of the VCB cassette status semaphore. OPEN is indicated by a black horizontal line on a white background

10. CENTRE PANEL WINDOW
CLOSED is indicated by a black vertical line on a white background

11. HANDLE AND KEY
The upper handle is used to raise and open the centre panel door and is retained when the door is lifted off its latches. The lower D ring key is used to unlock the centre panel door and is retained when the door is unlocked. Both are stored in the substation

12. KEY CABINET
This key cabinet is one of three that are located adjacent to each other within the substation. They are used to store operational keys for the switchgear

13. CENTRE PANEL
Company policy is to trip and close Circuit Breakers remotely, however a local mechanical trip button is provided for emergency use (the close button is permanently inoperative). Both buttons are protected by hinged and lockable plastic covers, however locks are not applied in normal service. The lever on the left is held in the up position as shown by gravity acting on the heavier internal part of the mechanism; it must be pressed down for the trip button to be effective

14. BUTTON EXTENSION MECHANISM
This mechanism is located on the rear of the centre panel door, controlled by the lever identified on the previous screen. It is shown in the lowered (retracted) position. When raised (extended), it allows the mechanical trip button on the front panel door to connect to the equivalent button on the front of the VCB cassette

15. SHUTTER MECHANISM
Automatic shutter operating mechanisms are located within the centre housing. The circuit shutter mechanism is on the left hand side and the busbar shutter on the right hand side. Both mechanisms are provided with locking points (arrowed) – it is vital that locks are removed before inserting VCB cassettes

16. VCB CASSETTE
This illustration shows a VCB cassette fully removed from its housing. The socket for the secondary wiring (Harting) plug is located at the upper left. Always move the VCB cassette using the folded metal grips on either side of the blue panel, never by gripping the polymeric moulded cases or the bushings

17. HARTING PLUG AND SOCKET
Low voltage supply and control connections between the housings and the VCB cassettes are implemented by this plug and socket. The plug must be disconnected before a VCB cassette can be removed from its housing and reconnected when a VCB cassette is restored. Note the interlocked over clip

18. TEST CASSETTE
A special test cassette is required to make contact with the circuit isolating contacts. It is inserted and removed using the special trolley in a similar manner to a standard VCB cassette. The test cassette may be reconfigured for busbar testing by inverting the horizontal bars

19. CASSETTE TROLLEY
VCB and test cassettes must be inserted and removed from housings using this special trolley, which is normally stored in the substation. Note the braked wheels. The handle is used to raise and lower twin spigots at the front of the trolley, which lock into matching sockets at the edge of the housing. The button is used to release the cassette from the trolley when re-inserting

20. EARTHING PANEL
Between the centre and lower panels is an area containing an earth switch (on the left) and its associated semaphore (on the right). A circuit live indicator system to IEC is located at the centre

21. EARTHING PANEL
This enlarged view of a feeder earthing panel shows two keys – the Proof of Isolation key on the right is not released unless the VCB cassette is racked to the isolated position. The Proof of Earthing key on the left may be removed only when the earth switch is closed

22. EARTHING PANEL
Some Circuit Breaker earthing panels are fitted with an additional Permissive Earth lock at the location arrowed. When the key is present, it allows the earth shutter to open. The key is normally located at the remote end of the circuit but it is not interlocked. The remote end must be isolated and the key collected, before earth on the PIX Circuit Breaker may be applied and the key should be returned to the remote end when not in use

23. EARTH SWITCH HANDLE
Earthing operations are carried out using this handle, which is stored in the substation

24. LOWER PANEL
If a VT is fitted it will be located inside the lower compartment – note that units fitted with a VT do not have a window in the lower panel. Under safe operational circumstances the panel may be unfastened and lifted off to reveal the VT fuses, instruction labels, locks and withdrawal handles. The function of the handles and locks is explained in the operational sections of this presentation

25. REMOTE CONTROL PANEL
It is company policy to open and close Circuit Breakers remotely from control panels located in an adjacent room. Incomer and Interconnector Circuit Breaker remote control panels are additionally fitted with an emergency trip button, which trips both the specified local Circuit Breaker and an associated Circuit Breaker on another switchboard. These trip buttons must be rotated to release after use

26. KEY EXCHANGE BOX
Certain procedures require use of key exchange boxes, as described in the operational sections of this presentation. They are mounted on the substation wall

27. Operating Instructions
Areva PIX
Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker

28. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Ensure that you have identified the correct Panel by reference to the nameplate. The Circuit Breaker ON lamp indicator on the upper panel and the Neon indicators between the centre and lower panels should both be illuminated

29. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the VCB status semaphore through the viewing window and ensure that it indicates CLOSED

30. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Post HV Warning notices on the local/remote controls of adjacent Panels

31. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Ensure that the rotary LOCAL/REMOTE control of the Circuit Breaker to be opened is selected to REMOTE. This is the normal setting for the control. Post a HV Prohibition notice

32. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
In an adjacent room, identify the correct remote control panel for the Circuit Breaker to be opened. Apply a HV Prohibition notice over the trip/close control of the Circuit Breaker to be opened and HV Warning notices over the trip/close controls of the adjacent Circuit Breakers

33. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Trip the Circuit Breaker at the remote position

34. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Ensure that the green CB OPEN lamp indicator is illuminated

35. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
On the upper panel of the selected Circuit Breaker ensure that the green OPEN lamp indicator is illuminated. Note that the M231 display unit may still indicate voltage present

36. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Ensure that the Neon indicators between the centre and lower panels have extinguished

37. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
In the viewing window of the centre panel, ensure that the mechanical semaphore indicates OPEN

38. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the local/remote control on the upper panel and select it to local

39. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the racking handle socket on the centre panel

40. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Open the socket shutter by rotating the adjacent button

41. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Open the socket shutter by rotating the adjacent button

42. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Insert the racking handle and rotate it approximately 21 turns anticlockwise to move the VCB cassette to the ISOLATED position. The handle will automatically ratchet when the VCB cassette reaches the ISOLATED position. Remove the handle on completion and close the shutter

43. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Insert the racking handle and rotate it approximately 21 turns anticlockwise to move the VCB cassette to the ISOLATED position. The handle will automatically ratchet when the VCB cassette reaches the ISOLATED position. Remove the handle on completion and close the shutter

44. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Insert the racking handle and rotate it approximately 21 turns anticlockwise to move the VCB cassette to the ISOLATED position. The handle will automatically ratchet when the VCB cassette reaches the ISOLATED position. Remove the handle on completion and close the shutter

45. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Obtain the D ring key from storage and insert it into the keyway at the base of the centre panel door. Rotate the key anticlockwise to unlock the centre panel door

46. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Obtain the D ring key from storage and insert it into the keyway at the base of the centre panel door. Rotate the key anticlockwise to unlock the centre panel door

47. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Obtain the door handle from storage and insert it into the lock on the left hand side. Rotate the handle anticlockwise to lift the door from its latches

48. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Obtain the door handle from storage and insert it into the lock on the left hand side. Rotate the handle anticlockwise to lift the door from its latches

49. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Open the door and identify the VCB cassette locking point in the lower left hand corner

50. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Fit an isolock, lock and HV Prohibition notice to the locking point
The Point of Isolation is established. This lock prevents complete removal of the VCB cassette

51. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Latch the door and post a magnetic HV Prohibition notice. Remove the handle on completion

52. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Latch the door and post a magnetic HV Prohibition notice. Remove the handle on completion

53. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Latch the door and post a magnetic HV Prohibition notice. Remove the handle on completion

54. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate the D ring key clockwise to lock the panel door closed. Remove the key and return it to storage

55. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate the D ring key clockwise to lock the panel door closed. Remove the key and return it to storage

56. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate the D ring key clockwise to lock the panel door closed. Remove the key and return it to storage

57. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the Proof of Isolation key, rotate and remove it

58. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the Proof of Isolation key, rotate and remove it

59. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the Proof of Isolation key, rotate and remove it
The VCB cassette cannot now be racked into the service position

60. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
If the Circuit Breaker is fitted with a VT, identify the two threaded fasteners at the base of the panel and release them. Lift and remove the panel

61. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
If the Circuit Breaker is fitted with a VT, identify the two threaded fasteners at the base of the panel and release them. Lift and remove the panel

62. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the two keys at the top of the VT compartment (illustration shown cut away)

63. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate the left hand key clockwise and the right hand key anticlockwise. Press down and pull the bronze handle outward to the notch position to isolate the VT

64. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate the left hand key clockwise and the right hand key anticlockwise. Press down and pull the bronze handle outward to the notch position to isolate the VT

65. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate both keys to the vertical position and remove the right hand key

66. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate both keys to the vertical position and remove the right hand key

67. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate both keys to the vertical position and remove the right hand key
The VT Point of Isolation is established

68. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Apply a HV Prohibition notice to the bronze handle

69. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Ensure that the Proof of Earthing key is set to the horizontal position, if it is not already horizontal

70. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
If the Circuit Breaker requires a Permissive Earth key, obtain this from the associated remote end location, insert and rotate it to the horizontal position

71. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Lift the shutter control pin and insert the earth switch operating handle

72. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate the handle clockwise to CLOSE the earth switch

73. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Circuit Earth is now applied
Rotate the handle clockwise to CLOSE the earth switch

74. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Remove the handle, allowing the shutter control pin to drop

75. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Remove the handle, allowing the shutter control pin to drop

76. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Ensure that the earth switch semaphore indicates EARTH ON

77. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate and remove the Proof of Earthing key

78. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate and remove the Proof of Earthing key

79. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Rotate and remove the Proof of Earthing key

80. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Apply a lock and HV Prohibition notice to the earth switch socket

81. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the lock out box in the Substation, remove the LOB 500 lock and open it. Place the key to the isolock/lock retaining the VCB cassette, the Proof of Isolation key, the Proof of Earthing key, the key removed from the earth shutter lock and the key removed from the VT lock (if a VT is fitted) inside complete with their identity discs. Remove the LOB XX lock and key stored inside the box and use it and the LOB 500 lock to secure the door

82. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the lock out box in the Substation, remove the LOB 500 lock and open it. Place the key to the isolock/lock retaining the VCB cassette, the Proof of Isolation key, the Proof of Earthing key, the key removed from the earth shutter lock and the key removed from the VT lock (if a VT is fitted) inside complete with their identity discs. Remove the LOB XX lock and key stored inside the box and use it and the LOB 500 lock to secure the door

83. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the lock out box in the Substation, remove the LOB 500 lock and open it. Place the key to the isolock/lock retaining the VCB cassette, the Proof of Isolation key, the Proof of Earthing key, the key removed from the earth shutter lock and the key removed from the VT lock (if a VT is fitted) inside complete with their identity discs. Remove the LOB XX lock and key stored inside the box and use it and the LOB 500 lock to secure the door

84. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the lock out box in the Substation, remove the LOB 500 lock and open it. Place the key to the isolock/lock retaining the VCB cassette, the Proof of Isolation key, the Proof of Earthing key, the key removed from the earth shutter lock and the key removed from the VT lock (if a VT is fitted) inside complete with their identity discs. Remove the LOB XX lock and key stored inside the box and use it and the LOB 500 lock to secure the door

85. Procedure to OPEN, establish Points of Isolation and Earth a Feeder Circuit Breaker
Identify the lock out box in the Substation, remove the LOB 500 lock and open it. Place the key to the isolock/lock retaining the VCB cassette, the Proof of Isolation key, the Proof of Earthing key, the key removed from the earth shutter lock and the key removed from the VT lock (if a VT is fitted) inside complete with their identity discs. Remove the LOB XX lock and key stored inside the box and use it and the LOB 500 lock to secure the door

86. Operating Instructions
Areva PIX
To remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker

87. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Identify the lock out box in the Substation, remove the LOB 500 and LOB XX locks and open it. Remove the key to the isolock/lock retaining the VCB cassette, the Proof of Isolation key, the Proof of Earthing key, the key for the earth shutter lock and the key for the VT lock (if a VT is fitted) inside complete with their identity discs. Replace the LOB XX lock inside the box and secure the door with a LOB 500 lock

88. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Identify the lock out box in the Substation, remove the LOB 500 and LOB XX locks and open it. Remove the key to the isolock/lock retaining the VCB cassette, the Proof of Isolation key, the Proof of Earthing key, the key for the earth shutter lock and the key for the VT lock (if a VT is fitted) inside complete with their identity discs. Replace the LOB XX lock inside the box and secure the door with a LOB 500 lock

89. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Identify the lock out box in the Substation, remove the LOB 500 and LOB XX locks and open it. Remove the key to the isolock/lock retaining the VCB cassette, the Proof of Isolation key, the Proof of Earthing key, the key for the earth shutter lock and the key for the VT lock (if a VT is fitted) inside complete with their identity discs. Replace the LOB XX lock inside the box and secure the door with a LOB 500 lock

90. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Identify the lock out box in the Substation, remove the LOB 500 and LOB XX locks and open it. Remove the key to the isolock/lock retaining the VCB cassette, the Proof of Isolation key, the Proof of Earthing key, the key for the earth shutter lock and the key for the VT lock (if a VT is fitted) inside complete with their identity discs. Replace the LOB XX lock inside the box and secure the door with a LOB 500 lock

91. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Identify the lock out box in the Substation, remove the LOB 500 and LOB XX locks and open it. Remove the key to the isolock/lock retaining the VCB cassette, the Proof of Isolation key, the Proof of Earthing key, the key for the earth shutter lock and the key for the VT lock (if a VT is fitted) inside complete with their identity discs. Replace the LOB XX lock inside the box and secure the door with a LOB 500 lock

92. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the lock and HV Prohibition notice fitted to the earth switch socket, restore and turn the Proof of Earthing key

93. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the lock and HV Prohibition notice fitted to the earth switch socket, restore and turn the Proof of Earthing key

94. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the lock and HV Prohibition notice fitted to the earth switch socket, restore and turn the Proof of Earthing key

95. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Lift the shutter control pin and insert the earth switch operating handle

96. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the handle anticlockwise to open the earth switch

97. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the handle anticlockwise to open the earth switch
Circuit earth is now removed

98. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the handle and return it to storage. Allow the shutter control pin to drop

99. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the handle and return it to storage. Allow the shutter control pin to drop

100. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Ensure that the earth switch semaphore indicates EARTH OFF

101. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
If the Circuit Breaker is fitted with a Permissive Earth lock, the key may now be rotated, removed and returned to its original remote end location

102. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
If the Circuit Breaker is fitted with a Permissive Earth lock, the key may now be rotated, removed and returned to its original remote end location

103. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
If the Circuit Breaker is fitted with a Permissive Earth lock, the key may now be rotated, removed and returned to its original remote end location

104. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Insert and rotate the Proof of Isolation key

105. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Insert and rotate the Proof of Isolation key

106. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the HV Prohibition notice from the centre panel door

107. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the HV Prohibition notice from the centre panel door

108. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Obtain the D ring key from storage and insert it into the keyway at the base of the centre panel door. Rotate the key anticlockwise to unlock the centre panel door

109. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Obtain the D ring key from storage and insert it into the keyway at the base of the centre panel door. Rotate the key anticlockwise to unlock the centre panel door

110. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Obtain the door handle from storage and insert it into the lock on the left hand side. Rotate the handle anticlockwise to lift the door from its latches

111. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Obtain the door handle from storage and insert it into the lock on the left hand side. Rotate the handle anticlockwise to lift the door from its latches

112. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Open the centre panel door and identify the isolock, lock and HV Prohibition notice fitted to the VCB cassette locking point. Remove these items

113. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Open the centre panel door and identify the isolock, lock and HV Prohibition notice fitted to the VCB cassette locking point. Remove these items

114. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Close the door and rotate the handle clockwise to lower it onto its latches. Remove the handle on completion and return it to storage

115. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Close the door and rotate the handle clockwise to lower it onto its latches. Remove the handle on completion and return it to storage

116. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Close the door and rotate the handle clockwise to lower it onto its latches. Remove the handle on completion and return it to storage

117. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the D ring key clockwise to lock the centre panel door, remove it on completion and return it to storage

118. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the D ring key clockwise to lock the centre panel door, remove it on completion and return it to storage

119. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the D ring key clockwise to lock the centre panel door, remove it on completion and return it to storage

120. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
If the unit is fitted with a VT, identify the HV Prohibition notice fitted to the bronze handle. Remove this item

121. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
If the unit is fitted with a VT, identify the HV Prohibition notice fitted to the bronze handle. Remove this item

122. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Insert the right hand key into the empty lock at the top of the assembly

123. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the left hand key clockwise and the right hand key anticlockwise. Press down and push the bronze handle fully inward to restore the VT to service. Release the keys to return to the vertical position on completion

124. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the left hand key clockwise and the right hand key anticlockwise. Press down and push the bronze handle fully inward to restore the VT to service. Release the keys to return to the vertical position on completion

125. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the left hand key clockwise and the right hand key anticlockwise. Press down and push the bronze handle fully inward to restore the VT to service. Release the keys to return to the vertical position on completion

126. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the left hand key clockwise and the right hand key anticlockwise. Press down and push the bronze handle fully inward to restore the VT to service. Release the keys to return to the vertical position on completion

127. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Restore the front panel and tighten the two threaded fasteners

128. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Open the socket shutter by rotating the adjacent button and insert the racking handle

129. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the handle approximately 21 turns clockwise to move the VCB cassette to the SERVICE position. The handle will automatically ratchet when the VCB cassette reaches the SERVICE position. Remove the handle on completion and close the shutter

130. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the handle approximately 21 turns clockwise to move the VCB cassette to the SERVICE position. The handle will automatically ratchet when the VCB cassette reaches the SERVICE position. Remove the handle on completion and close the shutter

131. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Rotate the handle approximately 21 turns clockwise to move the VCB cassette to the SERVICE position. The handle will automatically ratchet when the VCB cassette reaches the SERVICE position. Remove the handle on completion and close the shutter

132. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
On the upper panel, select the local/remote control to remote

133. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Identify the correct unit on the remote control panel in an adjacent room by reference to the nameplate. Press the trip circuit healthy push button to ensure that the trip circuit is functioning

134. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the HV Prohibition notice from the rotary trip/close control and close the CB to ON

135. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the HV Prohibition notice from the rotary trip/close control and close the CB to ON

136. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the HV Prohibition notice from the rotary trip/close control and close the CB to ON
The circuit is now energised

137. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the Warning notices from the adjacent units

138. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the Warning notices from the adjacent units

139. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
On the upper panel of the selected Circuit Breaker, ensure that the red CLOSED lamp indicator is illuminated. Remove the HV Prohibition notice from the local/remote control

140. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
On the upper panel of the selected Circuit Breaker, ensure that the red CLOSED lamp indicator is illuminated. Remove the HV Prohibition notice from the local/remote control

141. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Ensure that the Neon indicators between the centre and lower panels have illuminated

142. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
In the viewing window of the centre panel, ensure that the mechanical semaphore indicates CLOSED

143. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the HV Warning notices from the local/remote controls of adjacent Circuit Breakers on completion

144. Procedure to remove Circuit Earth, restore Points of Isolation and CLOSE a Feeder Circuit Breaker
Remove the HV Warning notices from the local/remote controls of adjacent Circuit Breakers on completion