ABB POLIM-D Manuale di istruzioni per l'uso - Pagina 8
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Operating instructions for POLIM
3.3.2.
Application guidelines
The following guidelines apply for the use of POLIM
•
Additionally for surge arresters equipped with disconnecing devices applies:
3.3.3.
Recommended torques and screw-in depths
The specified values in the table below apply for steel bolts of strength class 8.8 in
aluminum nut threads.
Thread
M12
M12
M12
M12
The specified values in the table below apply for POLIM
ped with a disconnecting device
Thread
M12
M10
3.3.4.
Behaviour in fire
The silicone housing of the surge arrester is self-extinguishing.
8
©
-D surge arrester
"Application guidelines Overvoltage protection"
Dimensioning, testing and application of metal oxide surge arresters in me-
dium voltage systems, pamphlet 1HC0075561
®
Use POLIM
-D surge arrester equipped with a disconnecting device in out-
door installations, only.
Use the disconnecting device with POLIM
Position
top connection
top connection
without socket
bottom
connection
bottom connection
without socket
bolt between disconnecting device and bottom con-
bolt of the disconnecting device
Torque
[Nm]
48
48
48
48
Position
nection of surge arrester
EN
®
-D surge arresters:
®
-D surge arrester, only.
Minimum
screw-in depth
screw-in depth
[mm]
18
18
18
12
®
-D surge arrester equip-
Doc. 1HC0010173 AB
ABB
Maximum
[mm]
25
20.5
20.5
12.5
Torque
[Nm]
20
20