40 Electrical installation
Routing the cables
When you route the cables:
• Install the DC power, MV and control cables on separate routes.
• Use separate lcable entries for different cable types.
• Make sure that the cable trays are electrically bonded to each other and to the ground.
• Make sure that there is at least 500 mm (20 in.) of separation between the power
cables and the control cables.
• If you need to put extra cables through the megawatt station, speak to your ABB
representative.
Earthing
Always construct an earthing electrode for the megawatt station. Follow the local
regulations. At the minimum, the electrode must meet these requirements:
• Minimum cross-sectional area: 95 mm
2
• Installation depth: 500...800 mm from the surface of the soil
• Installation route: Around the megawatt station, 1 m from the outer wall
Connect the earthing electrode to the terminal located at the base of the megawatt station
(refer to drawing 3AES-SH_4600-02-DW02). Use joint lubricant to protect the connection
point against corrosion. Tightening torque (M12 bolt-InoxA2/3) is 70 N·m.
Item Description
1 Medium-voltage cabling
2 Control cabling
3 DC cabling
4 Low-voltage cabling
5 Enclosure grounding terminal
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