Lightning

Lightning is another weather phenomenon associated with thunderstorms. A lightning flash is a high-voltage, electrostatic discharge that can cause physical damage to property by the high-energy strike itself, ensuing fire or induced surge transmitted through an electrical system.

A surge can damage electrical insulations, affect data or cause unwanted process actions. Any region of the world can be affected by lightning; however, the highest flash frequencies occurs from the equator through the northern and southern mid-latitudes.

Negative Positive
 
Tall, isolated structures on elevated ground. Building surrounded by buildings or trees of similar or greater height.
Buildings with a history of lightning strikes, or high frequency. Buildings with low hazard occupancies.
Locations storing hazardous materials such as flammable or combustible liquids and gases. Buildings with electrical, control, data and communication equipment that has low value or adequate specialised protection.
Locations with high-valued or sensitive electrical, process control, data processing or telecommunication systems.  

  • Where recognised, apply IEC 62305 “Protection Against Lightning”. Conduct a risk assessment per Part 2 and as appropriate a compliant lightning protection system for the building per Part 3 and protection of electronic systems within the building per Part 4.
  • Where recognised, apply applicable national codes or NFPA 70 “National Electrical Code” and NFPA 780 “Standard for the Installation of Lightning Protection Systems”. Conduct a risk assessment per NFPA 780 Annex H. Where appropriate, provide a complete UL listed Master Label lightning protection system to protect the building. Provide surge protection in accordance with NFPA 70.

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