IEC 60938-2-2:1999

Overview

IEC 60938-2-2:1999 is an international standard developed by the International Electrotechnical Commission (IEC) that focuses on fixed inductors used for electromagnetic interference (EMI) suppression. This particular part, Part 2-2, defines the blank detail specification for inductors requiring safety tests only. Unlike other related standards that include performance testing, IEC 60938-2-2 restricts its scope to safety verification, providing a streamlined approach for manufacturers to obtain safety approvals and conduct re-qualification tests based on design changes.

This standard establishes a uniform, globally recognized procedure to ensure that inductors used in electronic equipment meet essential safety criteria, reducing risks associated with electrical components while facilitating international trade through a consistent approval system.

Key Topics

• Scope & Purpose: IEC 60938-2-2 applies to fixed inductors specifically designed for EMI suppression that require safety testing without the comprehensive performance testing of IEC 60938-2-1. The standard supports manufacturers by outlining procedures for lot-by-lot conformance tests and design-based re-qualification.

• Design Declaration: Manufacturers must submit a detailed declaration of design covering essential parameters that impact safety testing. This confidential design registration includes materials, construction, insulation, and core characteristics to support certification bodies in approval processes.

• Test Procedures:

  • Initial Approval Tests: As stipulated, inductors undergo rigorous safety testing before market release, following protocols in the sectional specification IEC 60938-2.
  • Conformance Tests: Each production lot is checked against key criteria such as inductance tolerance, visual marking inspection, and voltage-proof tests to prevent defects.
  • Re-qualification Tests: Required when design changes occur, ensuring continued compliance and safety in evolving product lines.

• Standardized Layout: IEC 60938-2-2 prescribes a format for detail specifications that includes essential data like inductance ratings, voltage, current ratings, dimensional outlines, and flammability categories. This consistency supports efficient approval and traceability.

• Marking and Ordering: Clear marking requirements and minimum ordering information are defined to guarantee traceable and unambiguous component identification throughout the supply chain.

Applications

IEC 60938-2-2 is critical in industries requiring reliable electromagnetic interference suppression components with verified safety, such as:

• Consumer Electronics: Ensures fixed inductors in devices safely suppress EMI without performance testing overhead in low-to-medium volume applications.
• Industrial Equipment: Supports manufacturers needing conformity with international safety standards during product certification.
• Medical Devices: Guarantees that fixed inductors meet safety requirements essential for sensitive and regulated environments.
• Automotive Electronics: Provides safety assurance for inductors in vehicular systems where EMI management is vital.

This standard is particularly useful for manufacturers balancing cost constraints with strict safety requirements, enabling reduced testing while maintaining international recognition of safety compliance.

Related Standards

• IEC 60938-1:1999 – Generic specification for fixed inductors for EMI suppression, outlining basic requirements and testing methods.
• IEC 60938-2:1999 – Sectional specification providing detailed testing and design criteria for fixed inductors including safety and performance.
• IEC 60938-2-1 – A related part providing comprehensive safety and performance tests, applicable for mass-produced inductors.
• IEC 60050 – International Electrotechnical Vocabulary supporting terminology referenced in IEC 60938-2-2.
• IEC 60027, IEC 60417, IEC 60617 – Standards for electrical letter symbols and graphical symbols used for induced component marking and documentation.

Summary

IEC 60938-2-2:1999 is an essential standard for manufacturers of fixed inductors used in EMI suppression where safety testing is required without the full scope of performance evaluation. It facilitates cost-effective certification and quality control through standardized test procedures, design declarations, and clear documentation formats. Adherence to this standard ensures that inductors meet global safety expectations, crucial for reliable electronic product manufacturing and international market access.