Type 1 (or EN61643 Class I) protection devices are designed for point of entry protection where there is a high risk of a direct strike. Buildings in areas with a lightning strike density (Ng) greater than 15 strikes per km2 per year are also more likely to receive a direct strike.
Find Type 1 Surgeprotection by Novaris here.
The waveform that simulates a direct strike is the 10/350µs current impulse. 10µs is the length of time required to reach 90% of the maximum current and 350µs is the length of time for the current flow to fall back to 50% of maximum. The 10/350µs waveform is intended to represent the worst case direct lightning strike and contains approximately 17 times the energy of an equivalent peak 8/20µs waveform.
Due to the long duration and level of energy contained in a 10/350µs direct strike waveform, the protection components used to redirect the surge energy have to be very robust. The Novaris Type 1 protection products utilise spark gap technology to provide a very low resistance path for the surge current. The disadvantage of spark gap technology is that the arc takes time to establish, resulting in a higher residual voltage (Up). It is recommended to install secondary MOV based surge protection (Type 2) at the distribution level to reduce the voltage exposure of sensitive equipment.