Furse Earthing & lightning protection

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Vydal: ABB s.r.o.

Strana 113 z 132

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the connection from the bonding conductor the rebar to be encased concrete then the standard recommends that two clamps are used, one connected one length rebar and the other different length rebar.— Table Typical values the distance between down conductors according the Class LPS (IEC/BS 62305-3 Table 4). — 01 Typical methods of bonding steel reinforcement within concrete. — 01 If the reinforcing bars (or structural steel frames) are used down conductors then electrical continuity should ascertained from the air termination system the earthing system. Class LPS Typical distances I m II m III m IV m Natural components IEC/BS 62305 encourages the use of fortuitous metal parts within the structure to incorporated into the LPS. Stranded copper cable (70 mm² PVC insulated) Cast in non-ferrous bonding point Bonding conductor Clamped cable rebar connection Steel reinforcement within concrete (rebar) Stranded copper cable (70 mm² PVC insulated) Cast in non-ferrous bonding point Bonding conductor Clamped cable rebar connection Steel reinforcement within concrete (rebar) 113 TECHNICAL REFERENCE IEC/BS 62305-3 PHYSICAL DAMAGE STRUCTURES LIFE HAZARD . This ensure that those reinforcing bars likely carry lightning currents have secure connections from one length to the next. That these are welded, clamped with suitable connection components overlapped minimum 20 times the rebar diameter. The joints should then encased moisture inhibiting compound. If there doubt the route and continuity of the reinforcing bars within existing structures then external down conductor system should be installed. When internal reinforcing bars are required to be connected external down conductors or earthing network either the arrangements shown above suitable. For new build structures this can decided at the early construction stage using dedicated reinforcing bars alternatively run a dedicated copper conductor from the top the structure the foundation prior the pouring of the concrete. These should ideally bonded into the reinforcing network the structures at the top and bottom the structure. This dedicated copper conductor should bonded the adjoining/adjacent reinforcing bars periodically