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BS EN 50122-1. Railway applications. Fixed installations. Electrical safety, earthing and the return circuit. Part 1. Protective provisions against electric shock|Electric shocks, Rail safety, Earthing, Alternating current, Ground-level contact systems, Electrical safety, Earth conductors, Electric substations, Railway fixed equipment, Electric power transmission, Protective relays, Electrical faults, Switching substations, Earth-leakage circuit-breakers, Direct current, Voltage, Railway electric traction equipment, Overhead power lines, Safety measures, Railway equipment, Clearances, Overhead contact systems, Electrical protection equipment

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