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Lightning Risk Analysis and Assessment

IS/IEC 62305 – Protection against Lightning

Part 1 : General Principles
Part 2 : Risk Management has cross reference from the following balance parts of IS/IEC 62305.
Part 3 : Physical Damage to Structures and Life Hazards
Part 4 : Electrical and Electronic systems within structures.

IS/IEC 62305-2 discusses in detail about Lightning Risk Analysis & Assessment and defines the tolerable risk. After making use of the Lightning Risk Assessment Software, it will be known (by RED and GREEN color coding) whether the calculated risk for the building is below (GREEN) or above (RED) the tolerable risk levels.

If the calculated risk is below the tolerable level, there is no need of additional protection measures for that particular type of risk. This is possible only by detailed lightning risk analysis & assessment.

If the calculated risk is above the tolerable level, protection measures as below in a most economical configuration to be done for which the software gives the flexibility to select the economical protection measures.

The protection measures are

  1. Lightning Protection system as per LPL 1,2,3 & 4
  2. Surge Protection Devices as per LPL 1,2,3 & 4
  3. Fire Protection measures – Manual or Automatic
  4. Additional Protection measures by means of one or more of the following methods
  1. Soil Equi-potentialization
  2. Warning notices
  3. Electrical Insulation
  4. Physical Restrictions

There are 4 sources of damages (S1, S2, S3 & S4).
S1 : Flashes to a structure
S2 : Flashes near a structure
S3 : Flashes to a Line
S4 : Flashes near a Line

There are 3 types of damages (D1, D2, & D3).
D1 : Injury to living beings by electric shock
D2 : Physical Damage
D3 : Failure of Electrical and electronic systems

There are 4 types of Losses (L1, L2, L3 & L4)
L1 : Loss of Human life (including permanent Injury)
L2 : Loss of Service to the public
L3 : Loss of Cultural Heritage
L4 : Loss of economic value (structure, content and loss of activity)

There are 4 types of Risks (R1, R2, R3 & R4).
R1 : Risk of loss of Human life
R2 : Risk of loss of Service to the public
R3 : Risk of loss of Cultural Heritage
R4 : Risk of loss of economic value

To determine the risk analysis more exactly, so that lightning risk assessment can be made accurately, the risks are considered in detail. Every risk consists of a sum of risk components.

R1 = RA + RB + RC + RM + RU + RV + RW + RZ
R2 = RB + RC + RM + RV + RW + RZ
R3 = RB + RV
R4 = RA + RB + RC + RM + RU + RV + RW + RZ

Related IEC Standards for Earthing & Surge Protection Devices

IEC 61643-11: - Surge Protective Devices Connected to Low-Voltage Power Systems: Performance requirements and testing methods.

IEC 61643-12: - Surge Protective Devices Connected to Low-Voltage Power Systems: Selection and application principles

IEC 61643- 21: Low voltage Surge protection devices: Surge protection devices connected to telecommunication and signalling devices- Performance requirements and testing methods

IEC 61643-22: Low voltage Surge protection devices: Surge protection devices connected to telecommunication and signalling devices- Selection and application principle.

UL 467: Grounding and bonding equipment

IEC 62561- 1: Lightning Protection System components- Requirements for Connection components

IEC 62561- 2: Lightning Protection System components- Requirements for conductors and earth electrodes

IEC 62561- 3: Lightning Protection System components- Requirements for Isolating Spark gaps

IEC 62561- 4: Lightning Protection System components- Requirements for conductor fasteners

IEC 62561- 5: Lightning Protection System components- Requirements for Earth electrode housings and seals

IEC 62561- 6: Lightning Protection System components- Requirements for Lightning Strike counters

IEC 62561-7: Lightning Protection System components- Requirements for Earthing enhancing compounds

IEC 60364-5-54: Low voltage electrical installations- Part5-54: Selection and erection of electrical equipment- Earthing arrangements, protective conductors and protective bonding conductors

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