top of page

Arc Flash Calculations

Arc Flash Label Example.jpg



Arc flash calculations are crucial for several reasons, primarily related to safety, compliance, and the protection of personnel and equipment in electrical systems. Here are key reasons why arc flash calculations are important:

  1. Personnel Safety:

    • Prevention of Injuries: Arc flashes can result in severe injuries, including burns, hearing loss, and other life-threatening consequences. Arc flash calculations help determine the potential hazards and establish safety measures to protect personnel working on or near electrical equipment.

  2. Regulatory Compliance:

    • Adherence to Standards: Compliance with industry standards and regulations is essential for ensuring workplace safety. Arc flash calculations are often required by standards such as NFPA 70E (in the United States) to assess and mitigate arc flash hazards.

  3. Risk Assessment:

    • Identification of Hazards: Arc flash calculations quantify the energy released during an arc flash incident. This information is used to define the boundaries within which personnel are exposed to potential harm. Understanding these hazards allows for informed risk assessment and the implementation of appropriate safety measures.

  4. Selection of Personal Protective Equipment (PPE):

    • PPE Requirements: Arc flash calculations help determine the appropriate level of personal protective equipment (PPE) that workers must wear to minimize the risk of injury during an arc flash incident. This includes flame-resistant clothing, face shields, gloves, and other safety gear.

  5. Equipment Labeling:

    • Safety Communication: The results of arc flash calculations are used to label electrical equipment with important safety information. This labeling includes details such as the incident energy, arc flash boundary, and required PPE, providing clear guidance to personnel.

  6. Mitigation Strategies:

    • Engineering Controls: Arc flash calculations assist in the design and implementation of engineering controls to reduce the incident energy and mitigate the impact of an arc flash. This may involve adjusting equipment settings, installing protective devices, or using arc-resistant equipment.

  7. System Design and Configuration:

    • Optimized Design: Arc flash calculations play a role in the design and configuration of electrical systems. By understanding potential arc flash hazards, engineers can make informed decisions to optimize the system layout, select appropriate protective devices, and minimize risks.

  8. Emergency Response Planning:

    • Effective Response: Knowing the potential hazards enables organizations to develop effective emergency response plans. Personnel can be trained on proper procedures to follow in the event of an arc flash, minimizing confusion and ensuring a swift and coordinated response.

  9. Equipment Reliability:

    • Prevention of Equipment Damage: Arc flash incidents can cause significant damage to electrical equipment. By implementing measures based on arc flash calculations, organizations can protect their equipment, reduce downtime, and extend the lifespan of electrical components.

  10. Legal and Liability Considerations:

    • Liability Reduction: Implementing arc flash calculations and associated safety measures not only helps protect personnel but also reduces the legal and financial liabilities associated with workplace injuries. Compliance with safety standards demonstrates a commitment to a safe working environment.

In summary, arc flash calculations are a critical component of electrical safety programs, providing the necessary information to assess and mitigate the risks associated with arc flash incidents. Prioritising safety through these calculations contributes to a safer workplace, regulatory compliance, and the protection of both personnel and equipment.

​The on-site study results in arc flash equipment labeling, fault current and coordination analysis, recommendations for improvements and requirements for proper personal protective equipment (PPE). A review and analysis of the facilities written electrical safety program can also be included.

Arc Flash Studies are not currently standard practice in the UK but MET Group see an Arc Flash Study as having a future crucial role to play in the health and safety responsibility of all companies while ensuring originally correctly designed electrical installations are still fit for purpose.

Arc Flash Studies In most cases we find an original electrical designed electrical installation is added too by building alterations or company expansions where the electrical installation is added too rendering the original design redundant or putting the existing electrical installation in over loading .  

MET Group provides comprehensive arc flash engineering studies by sending one of our experts to your facility for a full, on-site evaluation, arc flash modeling, equipment evaluation relative to the fault current and clearing coordination of your system with detailed one-line electrical model drawings.

We offer turn-key services or will support your site team with  the services they need.


Talk to us

Contact us today and we can discuss your project needs.

bottom of page