earthing ring/loop beneath the foundations

earthing ring/loop at the bottom of the foundation excavations

etc.
bare copper cable or braid.

<<In new homes, a special earthing loop is built into the foundation. In older, existing homes this earthing loop is not present>>

<<An additional advantage is that the unit is stored underground and direct lightning damage is an impossibility due to the earthing loop (which is thoroughly grounded), situated underneath the unit. This earthing loop is also connected to the concrete steel structure via a clearly marked 8mm bolt.>>

<<The earth bar at each item of high voltage switchgear shall be; either,
„F connected directly to the substation earth bar, or control point earth bar, as applicable, with a 70 mm2
cable, or
„F connected into an earthing loop formed by interconnecting all high voltage switchgear earth bars with 70 mm2 cables>>

>>The turbine earthing system consists of one earthing ring arranged around the foundation and connected to the tower base frame. One earthing ring is placed around the transformer and connected to the turbine earthing system and the turbine foundation armouring. The earthing system is made according to DIN 18014. The complete earthing system ensures that a lightning stroke is led into the ground, without damaging any of the turbine components!>>

<<By foundation earth, is meant a conductor which is embedded in the foundation level of a building, and therefore makes a large-area contact with the ground it is incorporated as a closed ring in the external foundations and consists of galvanized steel strip. In general, foundation earths provide sufficiently low earth resistances. ...
The most effective form of earthing main conductor is represented by the earthing ring main conductor, which is installed in the basement or the ground floor of buildings containing extensive telecommunications sytems>>