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BS 7430 EARTHING CALCULATION CODE
raising standards worldwide NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BSI Standards Publication BS 7430:2011 Code of practice for protective earthing of electrical installations LicensedCopy:SurreyM5642ATHENS,UniversityofSurrey,21:49,UncontrolledCopy,(c)TheBritishStandardsInstitution2012