Furse Earthing & lightning protection

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Vydal: ABB s.r.o.

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Lightning equipotential bonding Equipotential bonding simply the electrical interconnection all appropriate metallic installations/parts, such that the event of lightning currents flowing, metallic part at a different voltage potential with respect one another. The gas, water and central heating system are all bonded directly the equipotential bonding bar located inside but close outer wall near ground level.Internal LPS design considerations The fundamental role the internal LPS to ensure the avoidance dangerous sparking occurring within the structure protected. The power cable bonded via suitable SPD, upstream from the electric meter, the equipotential bonding bar.43) shows typical example an equipotential bonding arrangement. larger extended structures several bonding bars may required but they should all interconnected with each other. This electrical interconnection can achieved by natural/fortuitous bonding using specific bonding conductors that are sized according to Tables and IEC/BS 62305-3. Bonding can also accomplished the use of surge protective devices (SPDs) where the direct connection with bonding conductors is not suitable. The Figure below (which based IEC/BS EN 62305-3 fig E. — 01 Example main equipotential bonding. The screen any antenna cable along with any shielded power supply electronic appliances being routed into the structure should also be bonded the equipotential bar. This bonding bar should located close the main distribution board (MDB) and also closely connected the earth termination system with short length conductors. the metallic parts are essentially at the same potential then the risk sparking or flashover nullified. Carrying out appropriate equipotential bonding measures ensuring there sufficient electrical insulation distance between the metallic parts can avoid dangerous sparking between different metallic parts. This could due, following lightning discharge, to lightning current flowing the external LPS or indeed other conductive parts the structure and attempting flash spark over internal metallic installations. — 01 Equipotential bonding bar Structural lightning protection system Central heating system Screen antenna cable Electronic appliances Power from utility Meter Meter Gas Water Electricity meter Consumer unit/ fuseboard ON OFF Neutral bar Live bar 115 TECHNICAL REFERENCE IEC/BS 62305-3 PHYSICAL DAMAGE STRUCTURES LIFE HAZARD