ANNEX 1 : TABLES (FROM IEC 62305-2: 2010)

Table A.1 – Structure location factor CD

Relative location | C D
Structure surrounded by higher objects | 0,25
Structure surrounded by objects of the same height or similar | 0,5
Isolated structure : no other object in the vicinity | 1
Isolated structure on a hilltop or a knoll | 2

Table A.2 – Line installation factor CI

Routing | CI
Aerial | 1
Buried | 0,5
Buried cables running entirely within a meshed earth termination (5.2 of IEC 62305-4:2010) | 0,01

Table A.3– Line type factor C T

Installation | C T
LV power, telecommunication or data line | 1
HV power (with HV/LV transformer) | 0,2

Table A.4 – Line environment factor C E

Environment | C E
Rural | 1
Suburban | 0,5
Urban | 0,1
Urban with tall buildings (higher than 20m) | 0,01

Table B.1 – Values of probability PTA that a flash to a structure will cause shock to living beings due to dangerous touch and step voltages

Additional protection measure | PTA
No protection measures | 1
Warning notices | 10-1
Electrical Insulation (e.g. at least 3mm cross-linked polyethylene) of exposed parts (e.g. down conductors) | 10-2
Effective soil equipotentialization | 10-2
Physical restrictions or building framework used as a down conductor system | 0

Table B.2 – Values of probability PB depending on the protection measures to reduce physical damage

Additional protection measure | Class of LPS | PB
Structure not protected by LPS | - | 1
Structure protected by LPS | IV | 0,2
III | 0,1
II | 0,05
I | 0,02
Structure with an air termination system conforming to LPS I and a continuous metal or reinforced concrete framework acting as a natural down conductor system | 0,01
Structure with a metal roof and an air termination system possibly including natural components, with complete protection of any roof installations against direct lightning strikes and a continuous metal or reinforced concrete framework acting as a natural down conductor system | 0,001

Table B.3 – Value of probability PSPD as a function of LPL for which SPDs are designed

LPL | PSPA
No coordinated SPD system | 1
III-IV | 0,05
II | 0,02
I | 0,01
The values of PEB may be reduced for SPDs having better characteristics(higher nominal current In, lower protective level Up etc)compared with the requirements defined for LPL I at the relevant installation locations(see table A.3 of IEC 62305-1:2010for information on lightning current probabilities, and Annex E of IEC 62305-1:2010 and Annex D of IEC62305-4:2010for lightning current sharing). The same annexes may be used for spds having higher probabilities PSPD | 00005-0,001

Table B.4 – Values of factors CLD and CL1 depending on shielding, grounding and isolation conditions

External line type | Connection at entrance | CLD | CLI
Aerial line unshielded | Undefined | 1 | 1
Buried line unshielded | Undefined | 1 | 1
Multi grounded neutral power line | None | 1 | 0,2
Shielded buried line (power or TLC) | Shield not bonded to the same bonding bar as equipment | 1 | 0,3
Shielded aerial line(power or TLC) | Shield not bonded to the same bonding bar as equipment | 1 | 0,1
Shielded buried line (power or TLC) | Shield bonded to the same bonding bar as equipment | 1 | 0
Shielded aerial line(power or TLC) | Shield bonded to the same bonding bar as equipment | 1 | 0
Lightning protective cable or wiring in lightning protective cable ducts, metallic conduit, or metallic tubes | Shield bonded to the same bonding bar as equipment | 0 | 0
(No external line) | No connection to external lines (stand-alone systems_ | 0 | 0
Any type | Isolating interface according to IEC 62305-4 | 0 | 0

Table B.5– Value of factor KS3 depending on internal wiring

Type of internal wiring | KS3
Unshielded cable – no routing precautions in order to avoid loopsa | 1
Unshielded cable – routing precautions in order to avoid large loopsb | 0,2
Unshielded cable – routing precautions in order to avoid loopsc | 0,01
Shielded cables and cables running in metal conduitsd | 0,0001

Table B.6– Values of probability PTU that a flash to an entering line will cause shock to living beings due to dangerous touch voltages

Type of internal wiring | PTU
No protection measures | 1
Warning notices | 10-1
Electrical Insulation | 10-2
Physical restrictions | 0

Table B.7– Value of probability PEB as a function of LPL for which SPDs are designed

LPL | PEB
No SPD | 1
III - IV | 0,05
II | 0,02
I | 0,01
The values of PEB may e reduced for SPDs having better characteristics(higher nominal current In, lower protective level Up etc)compared with the requirements defined for LPL I at the relevant installation locations(see table A.3 of IEC 62305-1:2010for information on lightning current probabilities, and Annex E of IEC 62305-1:2010 and Annex D of IEC62305-4:2010for lightning current sharing). The same annexes may be used for spds having higher probabilities PEB | 0,005-0,001

Table B.8– Values of the probability Pld of the cable screen and the impulse withstand voltage Uw of the equipment

Line type | Routing, shielding and bonding conditions | Withstand voltage Uw in KV
1 | 1,5 | 2,5 | 4 | 6
Power lines or telecom lines | Aerial or buried line, unshielded or shielded whose shield is not bonded to the same bonding bar as equipment | 1 | 1 | 1 | 1 | 1
Shielded aerial or buried whose shield bonded to the same bonding bar as equipment | 5 Ù/km<Rs≤20 Ù/km | 1 | 1 | 0,95 | 0,9 | 0,8
1Ù/km<Rs≤5 Ù/km | 0,9 | 0,8 | 0,6 | 0,3 | 0,1
Rs≤1 Ù/km | 0,6 | 0,4 | 0,2 | 0,04 | 0,02

Table B.9– Values of the probability PLI depending on the line type and the impulse withstand voltage Uw of the equipment

Line type | Withstand voltage Uw in KV
1 | 1,5 | 2,5 | 4 | 6
Power lines | 1 | 0,6 | 0,3 | 0,16 | 0,1
TLC lines | 1 | 0,5 | 0,2 | 0,08 | 0,04

Table C.3– Reduction factor rt as a function of the type of surface of soil or floor

Type of surface | Contact resistance (k Ù) | rt
Agricultural, concrete | ≤1 | 10-2
Marble, ceramic | 1-10 | 10-3
Gravel, moquette,carpets | 10-100 | 10-4
Asphalt, linoleum, wood | ≥100 | 10-5

Table C.4– Value of probability PEB as a function of LPL for which SPDs are designed

Provisions | rp
No provisions | 1
One of the following provisions: extinguishers, fixed manually operated extinguishing installations, automatic alarm installations, hydrantants, fire compartments, escape routes | 0,5
One of the following provisions: fixed manually operated extinguishing installations, automatic alarm installations (Only if protected against overvoltages and other damages and if firemen can arrive in less than 10min) | 0,2

Table C.5– Reduction factor rt as a function of the type of surface of soil or floor

Risk | Amount of risk | rt
Explosion | Zones 0,20 and solid explosive | 1
Zones 1,21 | 10-1
Zones 2,22 | 10-3
Fire | High | 10-1
Ordinary | 10-2
Low | 10-3
Explosion or fire | None | 0

Table C.6– Factor hZ increasing the relative amount of loss in presence of a special hazard

Kind of special hazard | hZ
No special hazard | 1
Low level of panic (e.g. a structure limited to two floors and the number of persons not greater than 100) | 2
Average level of panic (e.g. structures designed for cultural or sport events with a number of participants between 100 and 1000 persons) | 5
Difficulty of evacuation (e.g. structures with immobile persons, hospitals) | 5
High level of panic (e.g. structures designed for cultural or sport events with a number of participants – grater than 1000 persons) | 10