The earth-termination system disperses the lightning current into the ground. IEC 62305-3 recommends a low earthing resistance, ideally . The standard defines two types of earthing arrangements:
Rods or mesh that "catch" the lightning.
: Always refer to the latest version of the IEC 62305-3 PDF for design and installation guidelines.
(defined by the LPL) is rolled over the structure. Areas touched by the sphere require protection.
As the storm intensified, Emma's office building was hit by a powerful lightning strike. The blast was so strong that it knocked out the power and sent Emma stumbling backward. Luckily, she was wearing a hard hat and safety glasses, which protected her from the worst of the impact.
The standard now cross-references the IEC 62561 series , which deals specifically with lightning protection system components. Annex E has also been expanded to include detailed guidelines for the testing and maintenance of lightning protection systems.
A grid of conductors laid across flat roof surfaces. The standard mandates maximum mesh dimensions based on the LPL (e.g., for Class I; for Class IV).
Each LPL correlates directly with a fixed set of minimum and maximum lightning current parameters used to design the physical system: Lightning Protection Level (LPL) Class of Matching LPS Maximum Current Parameter Minimum Current Parameter Calculated System Efficiency LPL II LPL III LPL IV
The standard is a comprehensive framework for engineering effective physical lightning protection systems. By utilizing proper air-terminations, properly spaced down-conductors, robust grounding, and calculated equipotential bonding, designers can heavily reduce structural damage and life safety hazards.
A continuous closed ring electrode buried around the perimeter of the structure, or integrated foundational reinforcement steelwork. This is highly preferred for electronic safety. 4. Internal Lightning Protection and Equipotential Bonding
Dictates the structural design and installation parameters for internal and external lightning protection systems.
The risk components in IEC 62305-2 have been refined. R1 (loss of life), R2 (loss of service), and R3 (loss of cultural heritage) have been merged into a singular risk component "R," requiring equal consideration.
The air-termination system is the roof-level interception mechanism. IEC 62305-3 allows three methods to determine the placement and positioning of air rods, catenary wires, or mesh conductors: