Is there any IFC class to classify an earthing rod?
I’m not an expert on this, but think the closest generalisation of earthing rod would be the IfcCableSegment and you can apply the predefined type: CONDUCTORSEGMENT. Alternatively IfcProtectiveDevice.
For IFC 4 (awaiting IFC 4.4) I would suggest IfcCableFittingType with PredefinedType EXIT (or USERDEFINED with attribute ObjectType GROUNDINGROD)
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