Standardised testing of lightning protection components
Metallic connection components such as connectors, connection and bridging components, expansion pieces and equipotential bonding rails in lightning protection systems must be tested according to EN 50164-1 "Lightning Protection Components (LPC) – Part 1: Requirements for connection components". The named testing standard prescribed fixed testing arrangements. (Figure 4)
Lightning protection components should be classified according to their lightning current carrying capacity: Class H for high loads/100 kA, 50 As, 2.5 MA²s lightning current and Class N for normal loads/50 kA, 25 As, 0.63 MA²s lightning current
Before being subjected to lightning currents, conditioning/ageing through treatment with salt spray and a damp, sulphurous atmosphere is required. In special cases with components made of copper alloys with a copper component of < 80%, additional treatment with an ammoniac atmosphere is required.
After conditioning/ageing, the lightning current test is carried out with three lightning current pulses according to testing class H with 100 kA or N with 50 kA.
After the lightning current test, the samples on test must not show any signs of damage. The electrical contact resistance of the connection point may not exceed 1 mΩ and, in the particular case of stainless steel, a value of 2.5 mΩ. In addition, the release torque of screw connections may not fall below 0.25x the tightening torque or exceed 1.5x the tightening torque.
After successful testing, the results are documented and presented in a test report. The lightning protection component receives the BET test mark according to its testing class. Standardised testing of lightning protection components