BS EN IEC 61558-2-2:2025 - Safety of Transformers, Reactors, Power Supply Units, and Combinations Thereof

Introducing the latest standard in electrical safety, the BS EN IEC 61558-2-2:2025. This comprehensive document is essential for professionals in the electrical engineering and manufacturing industries, providing detailed guidelines and requirements for the safety of transformers, reactors, power supply units, and their combinations. Specifically, it focuses on control transformers and power supply units that incorporate control transformers, ensuring they meet the highest safety standards.

Key Features and Benefits

• Standard Number: BS EN IEC 61558-2-2:2025
• Pages: 22
• Release Date: March 19, 2025
• ISBN: 978 0 539 18783 0
• Status: Standard

This standard is a must-have for ensuring compliance with the latest safety regulations. It provides a detailed framework for testing and evaluating the safety of control transformers and power supply units, which are critical components in a wide range of electrical applications. By adhering to this standard, manufacturers and engineers can ensure that their products are safe, reliable, and efficient.

Comprehensive Safety Guidelines

The BS EN IEC 61558-2-2:2025 standard outlines specific requirements and tests that are crucial for the safety of control transformers and power supply units. These guidelines are designed to prevent electrical hazards, reduce the risk of fire, and ensure the overall safety of electrical systems. The standard covers various aspects, including:

• Electrical insulation and dielectric strength
• Temperature rise and thermal endurance
• Short-circuit and overload protection
• Mechanical strength and durability
• Environmental considerations and protection against moisture and dust

Why Choose BS EN IEC 61558-2-2:2025?

Adopting the BS EN IEC 61558-2-2:2025 standard offers numerous advantages for businesses and professionals in the electrical industry:

• Enhanced Safety: By following the guidelines set out in this standard, you can significantly reduce the risk of electrical accidents and ensure the safety of your products and systems.
• Regulatory Compliance: Stay ahead of regulatory requirements and ensure that your products meet the latest safety standards, avoiding potential legal and financial penalties.
• Improved Product Quality: Implementing the standard's requirements can lead to higher quality products that are more reliable and durable, enhancing customer satisfaction and brand reputation.
• Competitive Advantage: Demonstrating compliance with the latest safety standards can give your business a competitive edge in the market, attracting more customers and partners.

Who Should Use This Standard?

The BS EN IEC 61558-2-2:2025 standard is designed for a wide range of professionals and organizations, including:

• Electrical engineers and designers
• Manufacturers of transformers, reactors, and power supply units
• Quality assurance and compliance officers
• Safety inspectors and auditors
• Educational institutions and research organizations

Conclusion

In an ever-evolving industry where safety and compliance are paramount, the BS EN IEC 61558-2-2:2025 standard is an invaluable resource. It provides the necessary guidelines to ensure that control transformers and power supply units are designed and manufactured to the highest safety standards. By integrating this standard into your processes, you can enhance the safety, reliability, and performance of your electrical products, ultimately benefiting your business and customers alike.

Stay ahead in the field of electrical safety with the BS EN IEC 61558-2-2:2025 standard, and ensure that your products meet the rigorous demands of today's market.

BS EN IEC 61558-2-2:2025

This standard BS EN IEC 61558-2-2:2025 Safety of transformers, reactors, power supply units and combinations thereof is classified in these ICS categories:

• 29.180 Transformers. Reactors

This part of IEC 61558 deals with the safety of control transformers and power supply units incorporating control transformers. Transformers incorporating electronic circuits are also covered by this document. NOTE 1 Safety includes electrical, thermal and mechanical aspects. Unless otherwise specified, from here onward, the term transformer covers control transformers and power supply units incorporating control transformers. For power supply units (linear) this document is applicable. For switch mode power supply units IEC 61558-2-16 is applicable together with this document. Where two requirements are in conflict, the most severe take precedence. This document does not apply to transformers covered by IEC 60076-11. This document is applicable to stationary or portable, single-phase or polyphase, air-cooled (natural or forced) independent or associated dry- type transformers. The windings can be encapsulated or non-encapsulated. The rated supply voltage does not exceed 1 000 V AC and the rated supply frequency and the internal operating frequencies do not exceed 500 Hz. The rated thermal output does not exceed: - 25 kVA for single-phase transformers, - 40 kVA for polyphase transformers; This document is applicable to transformers without limitation of the rated thermal output, subject to an agreement between the purchaser and the manufacturer. NOTE 2 Transformers intended to supply distribution networks are not included in the scope. The no-load output voltage or the rated output voltage does not exceed 1 000 V AC or 1 415 V ripple-free DC. For independent transformers the no-load output voltage and / or the rated output voltage is not less than 50 V AC or 120 V ripple-free DC. This document is not applicable to external circuits and their components intended to be connected to the input terminals and output terminals of the transformers. NOTE 3 Transformers covered by this document are only used in applications where double or reinforced insulation between circuits is not required by the installation rules or by the end product standard. NOTE 4 Normally the control transformers are intended to be used with equipment to provide voltages different from the supply voltage for the functional requirements of the equipment. The protection against electric shock may be provided or completed by other features of the equipment, such as the body. Parts of output circuits may be connected to the input circuits or to protective earthing. Attention is drawn to the following: - for transformers intended to be used in vehicles, on board ships, and aircraft, additional requirements (from other applicable standards, national rules, etc.); - measures to protect the enclosure and the components inside the enclosure against external influences such as fungus, vermin, termites, solar-radiation, and icing; - the different conditions for transportation, storage, and operation of the transformers; - additional requirements in accordance with other appropriate standards and national rules may be applicable to transformers intended for use in special environments. Future technological development of transformers may necessitate a need to increase the upper limit of the frequencies. Until then this document may be used as a guidance document. This GROUP SAFETY PUBLICATION focusing on SAFETY guidance is primarily intended to be used as a PRODUCT SAFETY STANDARD for the products mentioned in the scope, but is also intended to be used by TCs in the preparation of publications for products similar to those mentioned in the scope of this GROUP SAFETY PUBLICATION, in accordance with the principles laid down in IEC Guide 104 and lSO/lEC Guide 51. One of the RESPONSIBILITIES of a TC is, wherever applicable, to make use of BSPs and/or GSPs in the preparation of its publications.