BS EN/IEC 62305-2 LPS Risk Assessment Calculator

Report Standard Edition

Select the standard reference shown in generated reports

Standard edition

Select a supported standard edition to display the project and risk-assessment parameter fields.

Project Information

Basic report details

Name of Project Client Project Location Consultant Name Main Contractor MEP Contractor Prepared By Date Created Case reference

Risk Selection

Select risks to be evaluated

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, including property where animals may be lost Animals may be lost for R4 shock components

RT for R1 RT for R2 RT for R3

BS EN 62305-2:2012 UK Annex NF tolerable risks: R1 = 1E-5, R2 = 1E-3, R3 = 1E-4. Note 1) applies to life-critical internal-system failures. Note 2) applies only where animals may be lost.

Structure and Lightning Density

Primary geometry and strike exposure inputs

Length L (m) Width W (m) Height H (m) Roof protrusion rise above roof Hp (m)

Collection area AD

m2

Collection area AM

m2

Source Td / NG input NG

flashes/km2/year

Select source to apply Annex A.1 formula.

Environment CE

environment factor

Location relative to surroundings CD

Adjacent structure at far end

Parameters for NDJ when a structure is connected to the far end of the line

Connected Lines

Incoming power, telecom, and data services

Number of connected lines

Zones of Protection / Loss Factors

Occupancy, time, probability, and loss factors

Number of zones used

PM

Protection Measures

Selected Protection Measures

Status Automatic calculation will show the selected protection result.

PBLightning Protection System for R1

Lightning protection system PB

SPDService and Data Line Protection for R2

Service Entrance SPD PEB

Coordinated SPD system PSPD

Cost-benefit assessment

Financial Inputs

Interest rate (%) Amortization rate (%) Maintenance rate (%) Cost of protection measures Annual cost of protection Cost of loss Link to unprotected case Cost of residual loss Annual saving

Calculation logic Annual protection cost = protection cost x (interest + amortization + maintenance). Residual loss is scaled from the linked unprotected risk to the protected risk. Annual saving = cost of loss - residual loss - annual protection cost.

Summary Result

Risk comparison with and without protection

Enter parameters and the result will update automatically.

Detailed Calculation

Component values in clause 4.3 order