EARTHING Bentonite Compound

If underground power cables are required torun at maximum direct burial rating when installed in cable duct, then thecable duct should be filled with Bentonite mixture (100 parts of 10:1 Bentonite/ water mix to 20 parts sand and 8 parts cement).

The Bentonite mixture should be pumped into thecable duct so totally excluding the air and on completion of the filling besealed to prevent any escape of Bentonite mixture