The standard provides strict formulas to calculate the earth resistance requirements, typically aiming for a value below 10 Ohms, though specific calculations may adjust this based on soil resistivity.
IEC 62305 is the international standard for lightning protection, published by the International Electrotechnical Commission (IEC). It consists of four parts: iec 62305-3 pdf
| Approach | Pros | Cons | | :--- | :--- | :--- | | | Legal, complete, always up-to-date, includes amendments | Expensive for individuals | | National copy (e.g., BS EN 62305-3) | Often cheaper, includes national forewords | Slight variations possible | | Free online scan (illegal) | No cost | Outdated, missing annexes, blurred tables, legal risk in audits | The standard provides strict formulas to calculate the
: Conductive paths that lead the lightning current safely from the air-termination to the earth. The standard provides technical requirements for two primary
The standard provides technical requirements for two primary areas:
The standard mandates how to safely conduct lightning current from the roof to the ground. Key requirements include:
Professionals cannot rely solely on summaries because the standard contains specific formulas and tables required for calculation, including:
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