4.7. Earthing the switchgear
When connecting the general earth collector, follow the
gure below.
Figure 4.21. Equipment earthing
1. Bolt the earth strip between every 2 medium voltage
cubicles, in the rear of the cable compartment, using 2
hexagonal M8 x 20 bolts. Apply a torque of 15 Nm.
Tools:
- 13 mm open-ended wrench.
- Torque wrench with 13 mm adapter.
2. Connect the end earthing bar, marked with the symbol
, to the general earth connection of the installation.
Earthing the equipment is an essential condition for
safety.
IG-296-EN version 01; 12/03/2020
28
Installation General instructions
cgmcosmos: Medium voltage cubicles with full insulation
in SF
6
gas up to 24 kV in accordance with IEC Standard