# Symbols and abbreviations (referenced to IEC 62305-2)

a Amortization rate............................................................................ Annex E

A d Collection area for flashes to an isolated structure ................................... A.2

A d¢ Collection area attributed to an elevated roof protrusion ......................... A.2.1

A i Collection area for flashes near a service................................. A.4; Table A.3

A l Collection area for flashes to a service.................................... A.4; Table A.3

A m Area of influence for flashes near a structure............................................ A.3

B Building............................................................................................... A.2

c Mean value of possible loss of the structure, in currency ................... C.4; C.5

C d Location factor...................................................................... A.2; Table A.2

C e Environmental factor.............................................................. A.5; Table A.5

C L Annual cost of total loss in absence of protection measures.......... 5.6; Annex E

C RL Annual cost of residual loss....................................................... 5.6; Annex E

C P Cost of protection measures............................................................ Annex E

C PM Annual cost of selected protection measures............................... 5.6; Annex E

C t Correction factor for a HV/LV transformer on the service............ A.4;Table A.4

c A Value of the animals in the zone, in currency........................................... C.5

c B Value of the building relevant to the zone, in currency.............................. C.5

c C Value of the content in the zone, in currency............................................ C.5

c S Value of the internal systems (including their activities) in the zone, in currency.......................................................................................................... C.5

c t Total value of the structure, in currency........................................... C.4; C.5

c Z Value of the cultural heritage in the zone, in currency............................... C.4

D i Lateral distance relevant to lightning flash near a service ......................... A.5

D1 Injury to living beings.......................................................................... 4.1.2

D2 Physical damage ................................................................................ 4.1.2

D3 Failure of electrical and electronic systems............................................ 4.1.2

h z Factor increasing the loss when a special hazard is present......... C.2;Table C.5

H Height of the structure ........................................................................... A.4

H a Height of the structure connected at end “a” of a service ........................... A.4

H b Height of the structure connected at end “b” of a service............................ A.4

H c Height of the service conductors above ground......................................... A.4

i Interest rate................................................................................... Annex E

K MS Factor relevant to the performance of protection measures against LEMP.... B.4

K p K S1 Factor relevant to the screening effectiveness of the structure................... B.4

K S2 Factor relevant to the screening effectiveness of shields internal to the structure .... B.4

K S3 Factor relevant to the characteristics of internal wiring.............................. B.4

K S4 Factor relevant to the impulse withstand voltage of a system...................... B.4

L Length of structure................................................................................ A.2

L a Length of the structure connected at end “a” of a service .......................... A.4

L A Loss related to injury to living beings.......................................... 6.2; Table 8

L B Loss in a structure related to physical damage (flashes to structure) 6.2; Table 8

L c Length of service section....................................................................... A.4

L C Loss related to failure of internal systems (flashes to structure)..... 6.2; Table 8

L f Loss in a structure due to physical damage.............................................. C.1

L M Loss related to failure of internal systems (flashes near structure).. 6.3; Table 8

L o Loss in a structure due to failure of internal systems................................. C.1

L t Loss due to injury by touch and step voltages .......................................... C.1

L U Loss related to injury of living beings (flashes to service).............. 6.4; Table 8

L V Loss in a structure due to physical damage (flashes to service)...... 6.4; Table 8

L W Loss related to failure of internal systems (flashes to service)........ 6.4; Table 8

L X Consequent loss in a structure................................................................ 6.1

L Z Loss related to failure of internal systems (flashes near a service). 6.5; Table 8

L1 Loss of human life in a structure........................................................... 4.1.3

L2 Loss of service to the public in a structure............................................. 4.1.3

L3 Loss of cultural heritage in a structure................................................... 4.1.3

L4 Loss of economic value in a structure.................................................... 4.1.3

m Maintenance rate............................................................................ Annex E

m* is the collection coefficient ................................................ Annex a,table A.0

N X Number of dangerous events per annum................................................... 6.1

N D Number of dangerous events due to flashes to a structure....................... A.2.3

N Da Number of dangerous events due to flashes to a structure at

“a” end of line ...................................................................... A.2.4; Table 8

N g Lightning ground flash density................................................................ A.1

N I Number of dangerous events due to flashes near a service........................ A.5

N L Number of dangerous events due to flashes to a service........................... A.4

N M Number of dangerous events due to flashes near a structure...................... A.3

n z Number of possible endangered persons (victims or users not served) C.2; C.3; E.2

n s Estimated or measured annual number of switching overvoltages......... Annex D

N s Annual number of switching overvoltages in excess of 2,5 kV.............. Annex D

n t Expected total number of persons (or users served)in the structure...... C.2; C.3

P Probability of damage........................................................................ 3.1.29

P A Probability of injury to living beings (flashes to a structure)........... 6.2; Table 8

P B Probability of physical damage to a structure (flashes to a structure) 6.2; Table 8

P C Probability of failure of internal systems (flashes to a structure)..... 6.2; Table 8

P LD Probability of failure of internal systems (flashes to a connected service)....... B.5; B.6; B.7

P LI Probability of failure of internal systems (flashes near a connected service)................. B.8

P M Probability of failure of internal systems (flashes near a structure). 6.3; Table 8

P MS Probability of failure of internal systems (with protection measures)............ B.4

P SPD Probability of failure of internal systems or a service when SPDs

are installed................................................................................... B.3;B.4

P U Probability of injury to living beings (flashes to a connected service).... 6.4; Table 8

P V Probability of physical damage to a structure

(flashes to a connected service)....................................................... 6.4; Table 8

P W Probability of failure of internal systems (flashes to a connected service) 6.4; Table 8

P X Probability of damage to a structure......................................................... 6.1

P Z Probability of failure of internal systems

(flashes near a connected service).............................................. 6.5; Table 8

r a Reduction factor associated with the type of surface................................. C.2

r p Factor reducing the loss due to provisions against fire.............................. C.2

R Risk ................................................................................................ 3.1.32

R A Risk component (injury to living beings – flashes to a structure)............... 4.2.2

R B Risk component (physical damage to a structure – flashes to a structure). 4.2.2

R C Risk component (failure of internal systems -flashes to a structure).......... 4.2.2

R D Risk for a structure due to flashes to the structure.................................. 4.3.1

r f Factor reducing loss depending on risk of fire........................................... C.2

R F Risk due to physical damage to a structure............................................ 4.3.2

R I Risk for a structure due to flashes not striking the structure.................... 4.3.1

R M Risk component (failure of internal systems – flashes near a structure). 4.2.3

R¢M Risk R M when protection measures are adopted................................. Annex E

R O Risk due to failure of internal systems.................................................. 4.3.2

R s Shield resistance per unit length of a cable......................................... B.5;B.8

R S Risk due to injury to living beings........................................................ 4.3.2

R T Tolerable risk.................................................................................... 3.1.34

R U Risk component (injury to living being – flashes to a connected service)... 4.2.4

R V Risk component (physical damage to structure

– flashes to a connected service)......................................................... 4.2.4

R W Risk component (failure of internal systems – flashes to the connected service)...... 4.2.4

R X Risk component for a structure........................................................... 3.1.33

R Z Risk component (failure of internal systems – flashes near a service)....... 4.2.5

R 1 Risk of loss of human life in a structure........................................... 4.2.1; 4.3

R 2 Risk of loss of service to the public in a structure............................ 4.2.1; 4.3

R 3 Risk of loss of cultural heritage in a structure.................................. 4.2.1; 4.3

R 4 Risk of loss of economic value in a structure................................... 4.2.1; 4.3

S Structure.............................................................................................. A.2

S......... Annual saving of money.................................................................. Annex E

S S Section of a service........................................................................... 3.1.36

S1 Source of damage - Flashes to a structure............................................. 4.1.1

S2 Source of damage - Flashes near a structure.......................................... 4.1.1

S3 Source of damage - Flashes to a service............................................... 4.1.1

S4 Source of damage - Flashes near a service............................................ 4.1.1

t z Annual period of loss of service, in hours................................................. C.3

t p Time in hours per year that persons are present in a dangerous place......... C.2

T d Thunderstorm days per year................................................................... A.1

U W Rated impulse withstand voltage of a system............................................ B.4

w Mesh width........................................................................................... B.4

W Width of structure.................................................................................. A.2

W a Width of the structure connected at end “a” of a service ............................ A.4

Z S Zones of a structure........................................................................... 3.1.35