Thunderstorm days per year (T_D)

Main Structure (L)

Main Structure (W)

Main Structure (H)

Structure location factor (C_D)

Length of a line section (LL)

Line installation factor (C_I)

Line type factor (C_T)

Line environmental factor (C_E)

Adjacent Structure (L)

Adjacent Structure (W)

Adjacent Structure (H)

Adjacent Structure location factor (C_DJ)

Flash to a structure will cause shock to living beings due to dangerous touch and step voltages (P_TA)

Protection measures to reduce physical damage (P_B)

SPD protection (P_SPD)

Depending on shielding, grounding and isolation conditions of the line for flashes to a line (C_LD)

Depending on shielding, grounding and isolation conditions of the line for flashes near a line (C_LI)

Characteristics of internal wiring (K_S3)

Impulse withstand voltage in kV (U_W)

Probability that a flash to an entering line will cause shock to living beings to dangerous touch voltages (P_TU)

probability as a function of LPL for which SPDs are designed (P_EB)

Depending on resistance RS of the cable screen and the impulse withstand voltage UW of the equipment (P_LD)

Value of the probability depending on the line type and the impulse withstand voltage UW in kV (P_LI)

Reduction factor associated with the type of surface (rt)

Reducing loss depending on risk of fire (rf)

Reducing loss due to provisions against fire (rp)

Expected total no. of persons (or users served) (nt)

Telecom line length in m

n_Z

Time in hours per year that persons are present in a dangerous place (T_z)

Loss due to injury by electric shock (L_T)

Loss in a structure due to physical damage (L_F)

Loss in structure due to failure of internal system (L_O)

Factor increasing the loss when a special hazard is present (h_Z)

Loss in a structure due to physical damage (L_F)

Loss in structure due to failure of internal system (L_O)

Total value of the structure, in currency (c_t)

Loss in a structure due to physical damage (L_F)

Value of the animals in the zone, in currency (c_a)

Value of the building relevant to the zone, in currency (c_b)

Value of the content in the zone, in currency (c_c)

Value of the internal systems (including their activities) in the zone, in currency (c_s)

Total value of the structure, in currency (c_t)

Total value of cultural heritage in the zone (C_z)

Loss in a structure due to physical damage (L_F)

Loss in structure due to failure of internal system (L_O)

Loss due to physical damage outside the structure (L_FE)

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