Arc Flash Study for Critical Power Distribution Network in Diego Garcia
Enhancing Electrical Safety Through Detailed Arc Flash Hazard Assessment — evaluating arc flash hazards within existing and upgraded electrical distribution systems associated with pad-mounted transformer replacement
Power Projects has been awarded an Arc Flash Study for a critical power distribution network associated with a transformer replacement project at an operational facility in Diego Garcia.
The engagement involves evaluating arc flash hazards within both the existing and upgraded electrical distribution systems associated with multiple pad-mounted transformers and switchgear installations. The study is aimed at improving personnel safety, supporting safe maintenance practices, and ensuring compliance with internationally recognised electrical safety standards.
Project Background
Electrical infrastructure operating in mission-critical facilities demands a high level of reliability and safety. As electrical systems are upgraded or modified, changes in equipment ratings, fault levels, and protection system behaviour can significantly influence arc flash risk.
To address these challenges, Power Projects will undertake a comprehensive arc flash hazard assessment covering the complete distribution network associated with the transformer replacement project.
System Overview
The electrical network under study comprises the following equipment — both existing and upgraded configurations will be assessed to ensure all operating scenarios are adequately evaluated.
13.8 kV distribution system
Two 500 kVA, 13.8/0.48 kV transformers
One 75 kVA, 13.8/0.48 kV transformer
13.8 kV high-voltage switchgear
480 V low-voltage switchgear
Associated distribution cables and downstream loads
Scope of Study
Power Projects will perform a detailed Arc Flash Hazard Analysis in accordance with IEEE 1584-2018 and NFPA 70E requirements.
Electrical network modelling
Arc flash incident energy calculations
Arc flash boundary determination
Arcing current calculations
Fault clearing time assessment
Personal Protective Equipment (PPE) recommendations
Arc flash warning label preparation
Final arc flash analysis report submission
Engineering Approach
The electrical network will be modelled in ETAP 24.0 using project-specific input data.
The study will evaluate:
By incorporating these parameters, the assessment will determine the potential thermal energy exposure at each equipment location and establish the corresponding protection boundaries.
The analysis methodology follows the latest IEEE 1584-2018 calculation procedures together with NFPA 70E workplace safety guidelines to ensure technically robust and industry-compliant results.
Key Deliverables
These deliverables will provide plant personnel with clear guidance regarding hazard exposure levels, required protective measures, and safe work practices when performing operation and maintenance activities.
Arc Flash Analysis Report
Comprehensive arc flash hazard report with full assessment findings and methodology
Incident Energy Assessment
Calculated incident energy levels at each equipment location in the distribution network
Arc Flash Boundary Calculations
Prohibited, restricted, and arc flash boundary distances for all assessed equipment
PPE Recommendations
Personal Protective Equipment category requirements for each equipment location
Arc Flash Warning Labels
IEEE 1584-2018 and NFPA 70E compliant arc flash hazard warning labels
Safety Compliance Documentation
Full compliance documentation to IEEE 1584-2018 and NFPA 70E standards
Benefits to the Facility
A detailed arc flash study provides significant operational and safety benefits, including:
Improved personnel safety during operation and maintenance activities
Identification of locations with elevated arc flash risk
Establishment of suitable PPE requirements at each equipment location
Compliance with IEEE 1584 and NFPA 70E requirements
Reduction of electrical safety risks during energised work activities
By identifying hazard exposure levels and defining appropriate protection measures, the study supports safer operation of critical electrical infrastructure while assisting facility operators in maintaining compliance with recognised industry standards.
Supporting Safer and More Reliable Electrical Networks
Electrical safety remains a fundamental requirement for industrial and critical infrastructure facilities. Through this engagement, Power Projects continues to support clients by delivering specialised engineering studies that improve workplace safety, minimise operational risk, and enhance the long-term reliability of electrical assets.
If your organisation is planning equipment upgrades, transformer replacements, or modifications to existing electrical systems, early evaluation of arc flash hazards can play a vital role in ensuring safe and compliant operation.
To discuss your project requirements, contact Power Projects. Our team provides IEEE 1584-2018 and NFPA 70E compliant arc flash hazard assessments for industrial, utility, and mission-critical facilities worldwide.