3.3.4.1 Probabilities of damage in case of direct lightning strikes

The values of the probability P_AT for electric shock to living beings due to touch and step voltages caused by direct lightning strikes to the structure (Equation 3.3.3.3.5) depend on the lightning protection system used and other protective measures:

[equation](3.3.4.1.1)

P_am describes the typical protective measures against touch and step voltages (Table 3.3.4.1.1). P_LPS depends on the protection class of the lightning protection system according to IEC 62305-3 (Table 3.3.4.1.2)

If more than one protection measure is taken, the value of P_am is the product of the corresponding values. It should also be noted that protective measures to reduce P_AT are only effective in structures that are protected by a lightning protection system (LPS) or that have a continuous building structure made of metal or reinforced concrete, which acts as an intrinsic LPS, provided that the requirements for equipotential bonding and earthing according to DIN EN IEC 62305-3 are met. Further details on protective measures are provided in chapter 3.3.5.