11:3 11 Structure and operation of the system Elpress systems consist of the following 5 parts: • hardened steel tip • leading rod • extension rod • driving sleeve/impact sleeve • earth line (not supplied by Elpress) This feature is simple • the earth line is inserted into the hardened steel tip and clamped by the leading rod. • the extension rods are fitted with a guide pin, which during work is pushed into the preceding rod. • earthing resistance can be measured continuously. When the appropriate value is reached, driving is interrupted and the last extension tube is withdrawn (and can therefore be reused). Practical advice: 1. Plan the earth connection. What are the soil conditions? Normal and loose soil - steel pipe Ø 17 mm is sufficient. Hard and rocky soil- steel rod Ø 21 mm (type HD) should be used. Is a parallel earth connection possible? 2. Determine the soil resistivity. Based on that and the maximum earthing resistance it can be estimated how much line is needed. 3. Start the driving by locking the line into the hardened tip with the leading rod. 16 mm² line should be folded double before the tip is attached. In loose soil, a sledgehammer and impact stud is sufficient. In heavier soil/at greater depth, a power hammer should be used. NOTE: Do not rotate the driving sleeve during the work. 4. Make sure that the line maintains the same speed down into the soil as the rod. If it does not, there are the following possibilities: - more rods than line required; the rod may have been bent and then runs parallel to the surface of the soil and the line does not follow the pipe through the ground. - the rod continues and the line stops; the line has come loose and can be pulled up or the tip has folded. - both stop; stone or rock has been found. If the stone does not shatter after about 10 seconds, you must start over. In the event of interrupted driving, start again at a distance at least 1.5 times the line length already driven down. 5. Preferably measure the earthing resistance continuously while driving down the earth line. Arrange a parallel earth connection if necessary. Splicing and branching of the earth line is contact crimped by means of Elpress through connectors or branching sleeves and tools. 2. Measurement of ground resistance. 3. The earth line is locked to the hardened steel tip with the leading rod. Driving starts. 1. Resistivity in different soil conditions.
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