74
4 Operations on switch disconnector
4.4
Use of NL operating mechanisms
This operating mechanism has three positions:
CLOSED (1), OPEN (0), EARTH ( ).
Operation
Procedure
First position
Final position
PUT
TING INT
O SER
VICE
1
Earth
Open
• Close the door. (See the instruc-
tions concerning the module)
• Unlock the keylock “earthing switch
closed” E (in case it is present)
• Insert the operating lever in B and
turn it clockwise
2
Open
Closed
• Unlock the keylock “switch open” C
(in case it is present)
• Insert the operating lever in A and
turn it clockwise
PUT
TING OUT OF SER
VICE
3
Closed
Open
• Unlock the keylock “switch closed”
H (in case it is present)
• Insert the operating lever in A and
turn it anti-clockwise
4
Open
Closed
• Unlock the keylock “earthing switch
open” D (in case it is present)
• Insert the operating lever in B and
turn it anti-clockwise
• Open the door (See the instruc-
tions concerning the module
NL operating mechanism must be used in the
absence of load and therefore in order to open
the line (operation 3), it is necessary to insert
the key in H. H key is usually interlocked with
the key of circuit-breaker.
Fig. 51
A
B
D
C
H
E
Summary of Contents for QMT Series
Page 1: ...Y4419D 01GF 18W12 QMT Manuale installatore Installation manual ...
Page 2: ...2 IT UK ITALIANO 3 ENGLISH 45 QMT ...
Page 15: ...Quadri Media Tensione QMT Manuale installatore 15 Tipo 2 Tipo 3 Tipo 4 ...
Page 44: ......
Page 57: ...Medium voltage switchgear QMT 57 Installation manual Type 2 Type 3 Type 4 ...
Page 86: ...86 Notes ...
Page 87: ...87 ...