This system divide into 3 type classes T1, T2 and T3. These standards contains regulations, requirements and tests for surge protection devices used in AC networks, Voltage upto 1000 V AC and upto 60Hz. This product is T1 Lighting Current Arrestor are used at the entry at the building. The connection parallel to external lines of energy networks. The direct lighting strike is simulated with test impulse of up top 100 kA with pulse shape 10/350 microsecond. The protection level is below 4000 V.