Document No. 1112M001 Revision 1.8 Date: June 2013
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5.2 Earthing (Grounding) (No responsibility is accepted)
Induced surges cannot be stopped; they can only be directed away
from equipment. The objective is to create the same zero potential and
minimum impedance to ground on all equipment.
The tower and all fitted equipment must be properly earthed. Note that
the positive and negative power lines from the turbine are isolated and
must not be connected to ground. Any grounding of the power circuit
would be done in accordance with the associated equipment being
installed. Do consult a professional engineer and your supplier for
guidance.
It is desirable to have only one ground point. Induced surges from an
electrical storm can create a potential difference across two ground
points, even in underground cable. It may not be practical to have one
single ground point if the turbine and tower is distant from the
installation. In that situation, the sheath of the supply cable should be
grounded at each end.
5.3 Cable Sizes and Installation
The tower power cable must be fitted inside the tower wherever
possible and should be buried underground. The cable must either be
armoured or run in underground electrical conduit.
Measure the distance from the tower top to the controller. Select a
suitable cable from the table.
The distance is one way and allows for +ve and –ve wires.
Distance is in metres and (feet).
Wire size is in square millimeters and American wire gauge (AWG)
Wiring must comply with local electrical standards. Consult a
professional in your area for compliance.
% power loss means that more power is lost as cable size
reduces.
