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WARNING!
Do not enter the inverter station or start cabling before checking that the
installation is stable.
￭
Constructing earthing electrode and earthing
The main earthing busbar of the inverter station must be connected to the earthing busbar
of the MV station and to an earthing electrode. See section
￭
Adding the cables
Add cables and cabling protection. See section
layout (page 61)
and chapter
1
1
DC cables
2
AC cables
3
Earthing, IO and PSU cables to MV station
￭
Filling the pit and finalizing the surroundings
1. If required for local frost conditions, add insulation around the column foundations.
2. Fill the hole with fine gravel with a 5 cm/m tilting angle. Leave a 15 cm air gap underneath
the inverter station.
3. To minimise growth of grass, the use of fiber around the station is recommended. Put
the fiber 20 cm below the station and about 80 cm around the station.
4. Construct two rows of 500 x 500 mm concrete tiles around all four sides of the inverter
station. The tiles will provide a dry standing place for service personnel and will prevent
the removal of gravel. The inverter station should overlap the adjacent tiles by 10 cm
to guide surface water away properly.
WARNING!
Take care not to damage cables when filling the pit. If necessary, use wood or
metal shields to provide temporary additional protection.
Foundation and external cabling
Electrical installation (page
2
Mechanical installation 29
Earthing (page
33).
2
1
3
34).
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