- #Plaster rings to increase number of conductors how to
- #Plaster rings to increase number of conductors crack
All terminal connections on precast pieces must have an electrically conductive connection.įacade elements, mounting channels, and metal substructures of facades can also be employed as a natural down-conductor system if:ġ) The dimensions are within the range of down-conductor systems’ minimum requirements. Parts for Precast: The terminal connectors for the reinforcement must be in the precast sections. External down conductors must be separate. Safe Interconnected Reinforcement: Existing structure reinforcement cannot be employed as a natural component of the down-conductor system unless the reinforcement can be safely coupled. Metal Skeleton: Ring conductors are not necessary if the metal frame of structures (with a steel skeleton or the interconnected reinforced steel) is employed as a down-conductor system, since additional ring conductors would not increase the current splitting. It is not electrically conductive since they are not connected. The insulating material may also wrap these metal constructions.ī) If the seals or connected pipes in the flanges/couplings are non-metallic, conduits containing flammable or explosive materials as down conductors are prohibited. As “natural components” of the down-conductor system, the following aspects of a structure can be used:Ī) Metal installations, as long as the safe connection between the various parts is permanent and the size of the down conductors meet the minimal standards. The number of down conductors placed individually can reduce when natural components of the structure are used. The downpipe collects a portion of the lightning current since it is attached to the eaves gutter, through which it passes current that needs to pass via the earth termination system. H) Even if the pipe is non-utilised as a down conductor, the base of metal downpipes must connect to the equipotential bonding or earth-termination system.
G) They must be linked such that the metal gutters intersect with the down conductor.
#Plaster rings to increase number of conductors crack
If it has a PVC sheath, it can be put in mortar, plaster or concrete (if the sheath is not physically damaged and the insulation does not crack at low temperatures).į) Conductors maintain the required separation distances between all doors and windows.
The length of the down-conductor system between these points must meet the separation distance’s requirement.ĭ) The total length l = l1 + l2 + l3 computes the separation distance measured in s.Į) For aluminium, it must not be laid immediately (without a gap) under plaster, cement, or concrete, nor in the ground. Installation of Down Conductor for Lightning Protection System (LPS):Ī) The down conductors must connect the air-termination conductors in a direct line.ī) They must be straight and vertical to provide the quickest direct connection to the earth possible.Ĭ) Loops must be avoided, such as projecting eaves or structures or the distance between two down-conductor system points. If the calculated separation distance cannot be maintained for the intended number of down conductors in a building, increasing the number of down conductors is one technique to achieve this requirement. A precise number of down conductors can be established by determining the separation distances. For each class of lightning protection system, the IEC 62305-3 (EN 62305-3) standard specifies typical distances between down conductors and ring conductors.įor each class of lightning protection system, the maximum temperature rise should be ΔT.
#Plaster rings to increase number of conductors how to
How to select a Down Conductor for Lightning Protection System?Ī) You can decide by considering the perimeter and external edges of the roof (the projection on the ground surface).ī) They must be positioned such that they can disperse around the perimeter of the structure commencing at the corners.Ĭ) The lengths between the various down conductors can vary depending on structural elements (e.g gates, precast components).ĭ) The corresponding lightning protection system class requires the total number of down conductors in every scenario. These currents can be straight, vertical and with no loops. Multiple parallel currents run to create connections for conductive components of the structure. It must be mounted to ensure that the system is unharmed during the lightning current discharge. The purpose of down-conductor systems is to safely transport intercepted lightning current to the earth-termination system without causing excessive temperature spikes that could harm the structure.
The electrically conductive connection between the air-termination system and the earth-termination system is the down conductor system.
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