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7
Grounding
In design of modules, the anodized corrosion resistant aluminum alloy frame is applied for rigidity support. For safety
consideration and to protect modules from lightning and electrostatic damage, the module frame must be grounded.
The grounding device must be in full contact with inner side of the aluminum alloy and penetrate surface oxide film of the
frame.
Do not drill additional grounding holes on module frame.
The grounding conductor or wire may be copper, copper alloy, or any other material acceptable for application as an
electrical conductor per respective National Electrical Codes. The grounding conductor must then make a connection to
ground with a suitable ground electrode.
Holes marked with a grounding mark on the frame can only be used for grounding but not for mounting.
Frameless double glass modules have no exposed conductor, and therefore according to regulations it did not need to
be grounded.
Grounding methods below are permissible
1 Grounding by grounding clamp
There have grounding holes with the diameter of Ø4.2 mm at the edge location of module's back-side frame. And the
grounding holes are identified with typical grounding symbol according to IEC61730-1 standard.
Grounding between modules shall be confirmed by qualified electricians and grounding devices shall be manufactured
by qualified electric manufacturer. The torque of copper core wire used for the grounding clamp is recommended to be
2.3 N•m. 12 AWG. And copper wires cannot be pressed during installation in case of damaging.
2 Grounding by unoccupied mounting holes
Mounting holes on modules that are not occupied can be used for installing grounding components.
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Align grounding clamp to the frame mounting hole. Use grounding bolt to go through the grounding clamp and frame.
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Put the tooth side of the washer on the other side and fasten the nuts.
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Put grounding wires through the grounding clamp and grounding wire material and dimension shall meet
requirements in local national and regional law and regulations.
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Fasten bolts of grounding wires and then installation is completed.
