Waterproof wall bushing:

Introduction:

In current structural engineering practice, a building with a basement is often designed in the form of a “white tank”. No additional sealing layer is required for the white tank, because the floor slab and outer walls are formed as an enclosed tank made of concrete with high resistance to water penetration as per DIN EN 206-1 and DIN 1045-2. This concrete is referred to as waterproof concrete.

Since the earth electrode material will be covered with a concrete layer of at least 5 cm (corrosion protection measure), humidity is no longer anticipated in the routing area, meaning the concrete acts as insulation. For this reason, an earth electrode must be routed outside for buildings with a white tank. In new constructions, this earth electrode is usually set up in the blinding layer below the foundation slab.

The effects of the modified recipe for waterproof concrete are described in the current standard DIN 18014:2007-09 “Foundation earth electrode – General planning criteria”.

The ring earth electrode meshes under the foundation plates installed according to DIN 18014 have to be connected with the main Earthing busbar (MEB) of the interior of the building for equipotential bonding.

The electrical connection to the ring earth electrode must also be waterproof. The installation of the wall bushing in the formwork to work correctly and competently, as described in detail in the corresponding installation instructions.

• Design for the formwork installation with water barrier and M10 / M12 double thread for connection; e.g. to the equipotential bonding bar
• Adjustable according to wall thickness with M10 thread and lock nut
• Bushing thread may be cut to length if necessary
• Including connector (St/tZn dim.: 30×4 mm) with square hole for connection with clamping piece for round conductors or cross unit with flat strips

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