Water-Pressure-Tight Wall Bushings for White Tank
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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. When developing the waterproof wall bushing, DEHN also applied the requirements placed on "white tanks" onto the product. As a result, during the development process, special emphasis was placed on incorporating component requirements as realistically as possible. Accordingly, the specimens were embedded in concrete (Figure 1) and then subjected to a pressure water test. In normal structural engineering practice, installation stations down to a depth of 10 m are common (e.g. underground car parks). This installation situation was applied to the test specimens, and they were charged with a water pressure of 1 bar (Figure 2). After the curing process of the concrete used, the test specimens were tested with water pressure and checked for watertightness by means of a long-time test (65 hours).
The capillary effect represents an increased level of difficulty for bushings. This means that liquids (e.g. water) disperse in narrow gaps or pipes to different extents and are literally drawn or sucked into the interior of the building. These narrow gaps or ducts can occur during the curing process and the resulting shrinkage of concrete.
It is therefore also important during 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.: 30x4 mm) with square hole for connection with clamping piece for round conductors or cross unit with flat strips
Art. 478530 WD M10 12 V4A DWD L200 300 STTZN
GTIN (EAN) 4013364120341, Codice doganale (EU): 85359000, Peso lordo: 697.00 g, UM: 1.00 pc(s)
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Caratteristiche tecniche
| Material of plate | StSt (V4A) |
| Material No. | 1.4571 / 1.4404 / 1.4401 |
| Material of axis | St/tZn |
| Wall thickness (l1) | 200-300 mm |
| Connection thread | M10 / 12 |
| Connection plate Ø | 80 mm |
| Short-circuit current (a.c. 50 Hz / d.c.) (1 s; ≤ 300 °C) | 2.6 kA |
| Standard | EN 62561-(1+5) |
Art. 478540 WD M10 12 V4A DWD L300 400 STTZN
GTIN (EAN) 4013364120358, Codice doganale (EU): 85359000, Peso lordo: 750.00 g, UM: 4.00 pc(s)
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Caratteristiche tecniche
| Material of plate | StSt (V4A) |
| Material No. | 1.4571 / 1.4404 / 1.4401 |
| Material of axis | St/tZn |
| Wall thickness (l1) | 300-400 mm |
| Connection thread | M10 / 12 |
| Connection plate Ø | 80 mm |
| Short-circuit current (a.c. 50 Hz / d.c.) (1 s; ≤ 300 °C) | 2.4 kA |
| Standard | EN 62561-(1+5) |
Art. 478550 WD M10 12 V4A DWD L400 500 STTZN
GTIN (EAN) 4013364120365, Codice doganale (EU): 85359000, Peso lordo: 838.50 g, UM: 1.00 pc(s)
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Caratteristiche tecniche
| Material of plate | StSt (V4A) |
| Material No. | 1.4571 / 1.4404 / 1.4401 |
| Material of axis | St/tZn |
| Wall thickness (l1) | 400-500 mm |
| Connection thread | M10 / 12 |
| Connection plate Ø | 80 mm |
| Short-circuit current (a.c. 50 Hz / d.c.) (1 s; ≤ 300 °C) | 2 kA |
| Standard | EN 62561-(1+5) |