The lightning protection radius (m) of a DEFYSTORM® ESE terminal is evaluated based on the 2011 NF C 17-102 formula.

It is calculated according to the following criteria:

  • The trigerring time ΔT of the DEFYSTORM® ESE terminal.
  • The protection level (I, II, III or IV) required for the installation and determined according to the lightning exposure of the area.
  • The actual height of the rod (m) placed above the area requiring lightning protection.
  • The hazard assessment (fire or explosion hazards, attendance) and the type of facility.

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