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.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 |
5Ù/km<Rs≤20Ù/km |
1 |
1 |
0,95 |
0,9 |
0,8 |
|
1Ù/km<Rs≤5Ù/km |
0,9 |
0,8 |
0,6 |
0,3 |
0,1 |
||
Rs≤1Ù/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 (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.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 |