Multi-level Protection Requirements Of Surge Protectors
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Power cables should implement multi-level protection. This multi-level approach uses each lightning protection zone as a tier, progressively attenuating lightning energy (energy distribution) to ensure coordinated voltage limits at each level. Ultimately, this restricts overvoltage values within the equipment's insulation strength (voltage coordination).
Multi-level protection is essential: failure at any level surge protective device or failure of any branch in level surge protector.
When the residual voltage of the surge protection device system does not match the equipment's insulation strength, or when cables are excessively long within the building.
