Designing to the IEC 62305 Series of Lightning Protection Standards Introduction This handbook is written to assist in the understanding of the IEC 62305 series of lightning protection standards. This guide simplifies and summarizes the key points of the standards for typical structures, and as such, the full standards should be referred to for final verification. This handbook does not document all IEC requirements, especially those applicable to less common or high risk structures such as those with thatched roofs or containing explosive materials. In many situations there are multiple methods available to achieve the same end result; this document offers ERICO’s interpretation of the standards and our recommended approach. In order to provide practical advice, information is included on industry accepted practices and from other standards.