Foundation earthing

Foundation earthing

Earthing material at a glance

The foundation earthing concept is the preferred method in new buildings with electrical installations. The earth conductor is embedded in the concrete foundation on the outside of the building and connected to form a closed ring.


Use of reinforcing steel in the concrete foundation

Reinforcing steel in the concrete foundation with a diameter of at least 10 mm can be used as an earth electrode. A highly conductive iron is connected to form a closed ring around the building using a clamp, crimp or other equivalent connection. Connection with binding wire is not permitted. It is important to mark the reinforcing bars before concreting to avoid confusion with normal reinforcement.


Earthing the foundation: Minimum requirements

A reinforcing steel with a diameter of 10 mm, which is connected around the building to form a ring, is sufficient for effective foundation earthing. This concept not only offers protection against corrosion, but also serves as an equipotential bonding conductor for all connections in the building.


Foundation earthing for buildings with a foundation trough

In the case of buildings with a foundation trough, it must be ensured that the foundation earth electrode is arranged in the floor of the outer trough. In the absence of a second tank, such as in Minergie houses, an additional spare earth electrode must be installed in the ground and connected to the foundation earthing every 15 m or at a distance from the down conductors (lightning protection).


Lightning protection concept and connection points

The connection points of the earthing can be used to discharge the lightning current if a corresponding lightning protection concept is in place and sufficient connection points are available. This ensures safe discharge of dangerous voltages and currents in the event of lightning strikes or atmospheric discharges.


These earthing methods not only provide safety, but also enable the efficient discharge of electrical currents to protect people, animals and property.

  • Branch flag
  • Bridging
  • Clamping plate
  • Connection
  • Connection flag
  • Connection set
  • Cross connector
  • Separator
Connection lug M10, length 2 m
Consisting of a 2 m long, easily bendable, stainless steel strip 30 × 3 mm incl. fixing material to the formwork. The upper end with M10 press-in nut is fixed to the formwork. The nut is used to attach a support rail for the terminals of the earth conductors, protective conductors etc. or as a connection for a disconnecting device for lightning protection systems. For connecting foundation earth electrodes (strip or reinforcing steel) to the connection points on the wall surfaces inside or outside the building.
Article number 48008N
Eldas number 156940207
Base Unit Piece
availability Delivery according to agreement
Price on demand
T-junction piece and crossing piece
for reinforcing steel Ø 8-10mm
Article number 48027
Eldas number 156940127
Base Unit Piece
availability available from stock
Dimensions length x width x height (mm) 40×41×40mm
Weight (g) 115
Price on demand
Branching tag M10 with clamping plate
Fitted with an M10 press-in nut and a clamping plate at the lower end. The branch lug enables branches to be made on the insulated conductor of the connection set inside the formwork or the installation of connection points for lightning protection, equipotential bonding, etc. of conductive vertical reinforcements. Connection points on the wall surfaces, inside or outside the building.
Article number 48029N
Eldas number 156940227
Base Unit Piece
availability Delivery according to agreement
Weight (g) 347,4
Price on demand
Clamping plate
Ensures a reliable connection of steel strip (25 x 3 mm) and (30 x 3 mm) as well as reinforcing steel (8 to 12 mm Ø) with a sturdy M10x40 screw.
Article number 48050
Eldas number 156980427
Base Unit Piece
availability Delivery according to agreement
Dimensions length x width x height (mm) M10×20mm
Weight (g) 184
Price on demand
Connection set w. copper conductor 50mm2
The connection set enables a smooth connection from the foundation earth electrode to wall surfaces. 3 meters long, 2 pressed-on clamping plates - simple and efficient.
Article number 48053
Eldas number 156940237
Base Unit Piece
availability Delivery according to agreement
Weight (g) 1880
Price on demand
Connection set with copper conductor 50 mm²
The connection set, consisting of a 3 m long, insulated conductor (cable 50 mm² Cu) and 4 pressed-on clamping plates for connection to 4 longitudinal steels, serves as a connection from the foundation earth electrode to the connection points on the wall surfaces inside or outside the building.
Article number 48028
Eldas number 156940217
Base Unit Piece
availability Delivery in 4 weeks
Weight (g) 2350
Price on demand
Dilatation joint bridging countersunk
Made of galvanized strip steel 30 × 3 mm for setting in concrete, complete with mounted universal clamping plates, embedded in foamed plastic, which creates the recess. Total length: 44 cm
Article number 48025
Eldas number 156940307
Base Unit Piece
availability Delivery according to agreement
Weight (g) 980
Price on demand
Disconnecting unit for grounding
For connecting the end of a banding conductor (20×3mm to 40×3mm ) protruding from the ground. Serves as a disconnection point between earth conductor, lightning protection system, etc. Bolt clamp M8 for cable lugs and round copper Ø 6mm .For installation of the disconnecting device we recommend the boxes No. 48010 or 48031
Article number 48023
Eldas number 156980407
Base Unit Piece
availability Delivery according to agreement
Weight (g) 353
Price on demand
Universal clamping plate
Used to connect steel strips 25 × 3 mm to 40 × 3 mm and reinforcing steel 8 to 25 mm Ø with 2 M8×25 screws and 2 washers.
Article number 48012
Eldas number 156940117
Base Unit Piece
availability Delivery according to agreement
Dimensions length x width x height (mm) 75×55×5mm
Weight (g) 282
Price on demand
This system can be found in the following categories and applications: