BS EN 50522. Earthing of power installations exceeding 1 kV a.c.|Inspection, Industrial, Railway electric traction equipment, Electric power systems, Electrical resistivity, Domestic electrical installations, Alternating current, Metals, Lighting systems, Caravans, Explosive atmospheres, Tramway systems, Mobile, Mathematical calculations, Direct current, Corrosion protection, Electric discharges, Mining, Railway equipment, Equations, Cathodic protection, Earthing, Selection, Electric generators, Electric power stations, Street furniture, Designations, Classification systems, Electrical impedance, High-voltage equipment, Maritime structures, Electric cables, Electric power networks, Scaffolds, Electrical measurement, Lightning protection, Performance testing, Electrical properties of materials, Performance, Low voltage, Fences, Electrical protection equipment, Electrical safety, Electrical resistance, Electric conductors, Circuit diagrams, Grades (quality), Overhead power lines, Corrosi