- BuildingDesign News - Construction / Services News Archives

Article Date: 19th April 2021

Kingsmill Industries - Equipotential Bonding

Kingsmill equipotential bonding

Kingsmill provides a range of products for effective bonding of electrically conductive components to the Lightning Protection System.

An important aspect of a Lightning Protection System (LPS) is that electrically continuous parts of a structure must be bonded into the Lightning Protection network. The purpose of this bonding is to ensure that, in the event of a lightning discharge, any sparking or flashover of the lightning current to conductive parts of the structure, for example water pipes, cables, etc is avoided.

During a lightning strike the lightning conductor system could reach 1,500,000 volts with respect to earth, whilst the copper piping connected to the water tank is at 0 volts to earth.

The impedance of the lightning conductor system will determine the “potential difference” between the two systems with respect to earth, as well as the distance that the water tank is away from the lightning conductor. If the potential difference is large enough, it may cause breakdown of the insulation effects of the roof and air, leading to a spark flashing over to the water tank.

Equipotential bonding in this respect, is essentially the connection of conductive metallic parts of the structure such that in the event of a lightning discharge, no potential differences exist between the lightning conductor system and the “other conductive low impedance pathways”.

Materials that can provide a fortuitous low impedance pathway and may require bonding into the lightning protection system are such as:

  • Cable screens
  • Metallic pipework, handrails, stairways, screens
  • Structural steelwork
  • Ductwork, etc
  • Supporting structures for curtain wall systems
  • Metallic cladding systems for buildings

The risk of flashover can increase in the presence of incorrect routeing of conductors and high impedance lightning protection system – due to the installation of poorly designed components, or inferior/corrosion prone materials.

BuildingDesign Media © - BuildingDesign Portal | BuildingDesign Tenders