In 2024, Shipshaw Électrique commissioned 3E Eng. to conduct an Arc Flash study on several temporary sites associated with the operations of the Rio Tinto AP60 aluminum smelter in Saguenay. These electrical installations, spread across 11 sites, required a rigorous assessment of arc flash risks to ensure personnel safety and regulatory compliance.
Arc flash mandate in Saguenay
Arc Flash Study of Rio Tinto's Temporary Sites
- Client
- Shipshaw Électrique
- Year
- 2024
- Location
- Saguenay-Lac-Saint-Jean
Context
Objectives
- Assess the incident energy during arc flash events.
- Determine the required PPE levels for workers based on the results.
- Define safe response distances according to the CSA Z462-18 standard.
- Clearly identify and label each electrical panel and cabinet.
Methodology
The study was conducted in accordance with IEEE 1584 and CSA Z462-18 standards and included:
- Modeling of the electrical network for each of the 11 temporary sites based on the technical data provided.
- Short-circuit calculations and simulation of fault scenarios.
- Analysis of arc flash hazards at motor control centers (MCCs).
- Production of a comprehensive report including results, recommendations, and incident energy levels.
- Supply and installation of Arc Flash labels compliant with current standards at each site.
The study was conducted using specialized EasyPower software, ensuring the accuracy of the calculations.
Key results
- Analysis conducted at 11 sites.
- Arc Flash labels affixed to all identified electrical panels, facilitating quick risk assessment and PPE selection.
- PPE categories determined based on measured incident energy levels, ensuring adequate protection for personnel.
- Delivery of a detailed report providing Shipshaw Electric teams with concrete tools to manage electrical work safely.
Impact and benefits
Thanks to this study, Shipshaw Electric and Rio Tinto can now:
- Enhance worker safety by reducing the risks associated with electric arcs.
- Standardize response procedures across all AP60 temporary sites.
- Ensure compliance with international standards (IEEE 1584, CSA Z462-18).
- Prevent serious accidents, thereby limiting production downtime and associated costs.
Conclusion
The Arc Flash study conducted by 3E Eng. for Shipshaw Électrique demonstrates the importance of proactive electrical risk analysis in temporary industrial environments. By combining modeling, standardized calculations, and the implementation of safety labels, this project ensures better protection for personnel and a high level of compliance.
