The earth-termination system safely disperses the lightning current into the ground. The standard prefers a low earth resistance (typically or less). It defines two types of arrangements:
: Before designing an LPS, it's essential to assess the risk of a lightning strike. This involves evaluating factors like the location of the structure, the type of structure, and the potential consequences of a lightning strike.
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IEC 62305-3 is the international benchmark that provides requirements for protecting structures against physical damage and injury to living beings due to lightning strikes. It replaces the older IEC 61024-1 standard and works in harmony with its companion parts:
: These provide several parallel paths to lead the current safely down the side of the structure, minimizing the risk of dangerous sparking (side flashes).
Official copies of the standard can be purchased through recognized international and national standards bodies: International Electrotechnical Commission (IEC) : Purchase directly from the IEC Webstore IEC Products & Services Portal BSI Knowledge (UK) : Access the British version (BS EN IEC 62305-3:2024) via BSI Knowledge Standards iTeh : Provides a preview of the IEC 62305-3:2024 PDF and various purchase options for engineers and architects. iTeh Standards testing facility specializing in IEC 62305 compliance in a specific region? IEC 62305-3:2024
The earth-termination system safely disperses the lightning current into the ground. IEC 62305-3 recommends a low earthing resistance (ideally less than 10 ohms) and outlines two types of arrangements:
Some key aspects of IEC 62305-3 include:
Restricting access to the ground area near down-conductors or using asphalt/gravel layers to increase surface resistance. 6. Inspection and Maintenance
Disperses the lightning current into the ground. IEC 62305-3 details two arrangements:
: Clarified calculation methods (general and simplified) to prevent "side-flashing" between conductors and internal metal parts. Modern Structures : Updated guidance for protecting complex designs, such as green roofs and tall building facades. Component Compliance : Mandates that all components meet the IEC 62561 series standards for reliability. How to Access the Official PDF
