4 Installation
4.6 Earthing and Connecting the Leads
4.6.1 Earthing
Connect the breaker base to the high-voltage station earth by means of earth terminals provided.
a) Earthing bolts
Fig. 52 Earthing bolts in base (viewed from outside/inside)
4.6.2 Work on High-Voltage Terminals
WARNING
For safety reasons, work on high-voltage terminals should be carried out before the circuit-
breaker is filled with SF
6
-gas up to nominal pressure.
The connection of the high-voltage conductors is allowed at nominal SF
6
pressure provided that the warnings are
followed.
WARNING
High gas pressure - Danger of bursting!
The porcelain insulators should not be exposed to any stress (e.g. from vibration, etc.). Great
care should be taken to avoid damaging the porcelain body and fins with tools or handling aids.
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