Operating instructions for POLIM
©
R surge arrester
ABB
8
EN
Doc. 1HC0075743 AA
3.3.2.
Application guidelines
The following guidelines apply for the use of POLIM
®
-R surge arresters:
"Application guidelines - Overvoltage potection"
Dimensioning, testing and application of metal-oxide surge arrresters in
medium voltage systems, pamphlet 1HC0075561
"Application guidelines - Overvoltage potection"
Dimensioning, testing and application of metal-oxide surge arrresters in
railway facilities, pamphlet 1HC0075573
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 Position Torque
[Nm]
Minimum
screw-in depth
[mm]
Maximum
screw-in depth
[mm]
M10
Head end
terminal
30 12 16
3.3.4.
Behaviour in fire
The silicone housing of the surge arrester is self-extinguishing.