: This grounding network disperses the massive energy into the earth, with a typical target resistance of less than . Key Design Methods
Designing an External Lightning Protection System (LPS) to intercept direct strikes.
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They must be spaced evenly around the perimeter of the structure. The spacing distance ( ) depends directly on the designated LPL.
Systems deployed in explosive environments or highly corrosive areas should undergo complete inspections every year. Sourcing the Official IEC 62305-3 PDF iec 62305-3 pdf
Note: Because international standards are copyrighted documents, official, legally compliant copies of the IEC 62305-3 PDF must be purchased through the International Electrotechnical Commission (IEC) webstore or national standards bodies (such as BSI, DIN, or ANSI).
National standards bodies (such as BSI in the UK, DIN in Germany, or ANSI in the United States).
Measures taken to prevent dangerous sparking within the structure, primarily through equipotential bonding (connecting metal parts) and maintaining separation distances between the LPS and other conductive elements. 3. Lightning Protection Levels (LPL)
Unlike Part 2, which focuses on Risk Management (calculating whether you need protection), Part 3 assumes you need it and tells you how to do it. It provides the design principles for: : This grounding network disperses the massive energy
s=ki⋅kckm⋅ls equals k sub i center dot the fraction with numerator k sub c and denominator k sub m end-fraction center dot l depends on the chosen LPL Class.
Intercepts the lightning strike using rods, catenary wires, or meshed conductors. Down-conductor system:
: The path that leads the current from the roof to the ground. Earth-termination system : Electrodes that dissipate the current into the soil. Internal Lightning Protection System : Prevents dangerous sparking within the structure. Equipotential bonding : Connecting metal parts to prevent voltage differences. Electrical insulation
Individual horizontal or vertical electrodes connected to each down-conductor (common for low-risk or existing structures). This link or copies made by others cannot be deleted
: Guidelines for periodic inspections to ensure the system hasn't degraded over time.
The external LPS is your building's primary shield. It consists of three integrated sub-systems: the air-termination system, the down-conductor system, and the earth-termination system. A. Air-Termination System
A complete lightning protection system compliant with this standard is typically divided into two categories: External Lightning Protection System
Designing an Internal Lightning Protection System to prevent dangerous sparking inside the structure.