The Active 1D ® excitation advance is obtained by a device named « impulse device ». Its principle consists in storing electrostatic energy present in the atmosphere at a stormy cloud approach to release the ascending discharge excitation in a goodtime. This device operates with an integrated sensor which measures the surrounding electrical field value. It generates then a polarity inversion of the lightning rod head, creating a sudden amplification of the electrical field on its point.

Enhanced Protection Zone

The Active 1D® radii of protection here below mentioned, are defined for the four "Np" levels of protection (from I to IV) regarding to "h" real height between the lightning rod point and the highest point of the structure to protect.

∆T: Excitation advance, for Active 1D®, ∆T=12, 25, 45 and 60µs

• Np: level of protection with more or less severity (I to IV) determined by the lightning risk assessment with the Lightning Risk software according to NFC 17-102 standard,

• H (m): height between the lightning rod point and the highest point of the structure to protect.