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

 

Table A.1 – Structure location factor CD

 

Relative location

CD

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 CT

 

Installation

CT

LV power, telecommunication or data line

1

HV power (with HV/LV transformer)

0,2

 

 

Table A.4 – Line environment  factor CE

 

Environment

CE

Rural

1

Suburban

0,5

Urban

0,1

Urban with tall buildings (higher than 20m)

0,01

 

 

Table B.1Values 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.2Values 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.3Value 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.4Values 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.5Value 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.6Values 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.7Value 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.8Values 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

5Ù/km<Rs20Ù/km

1

1

0,95

0,9

0,8

1Ù/km<Rs5Ù/km

0,9

0,8

0,6

0,3

0,1

Rs1Ù/km

0,6

0,4

0,2

0,04

0,02

 

Table B.9Values 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 (kÙ)

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.4Value 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