Installation of Bentonite Into Trench
For the installation of an earth rod or electrode into a trench the following procedure is recommended.
1 Dig a trench at the required earth strip or electrode location of 200-300mm (8-12 inches) wide. The depth of the trench (typically 600mm) should be determined by the earthing system designer.
2 Cover the bottom of the trench with a stiff mix of Bentonite compound 25-50mm (1-2 inches) thick. Lay the earth strip into the trench. Ensure that the copper strip electrode is not depressed too far into the Bentonite.
3 Apply another layer of Bentonite 25-50mm (1-2 inches) thick. Ensure that the strip electrode is fully covered.
4 Carefully backfill and compact the remainder of the trench.
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