Depending on the design of the concrete foundations, either a foundation earthing rod or a ring earthing rod with a functional equipotential bonding conductor is required for earthing. Below are two standard details for foundation earthing rods:
Foundation earthing in reinforced foundation without insulation
Foundation earthing in reinforced foundation with perimeter insulation
on one side
Legend:
1 Reinforced foundation
2a Foundation earthing (connection to reinforcement ≤ 2 m)
3 Connection terminal
4 Connection lug
5 Functional potential connection conductor (connection to reinforcement ≤ 2 m)
6 Cleanliness layer
7 Design water level
8 Perimeter insulation
Source: bauwion
