IEC 62310-2:2006

Overview

IEC 62310-2:2006 is an international standard developed by the International Electrotechnical Commission (IEC). It is part of the IEC 62310 series, which addresses Static Transfer Systems (STS) used in alternating current (a.c.) power networks. This second part focuses specifically on Electromagnetic Compatibility (EMC) requirements for free standing a.c. static transfer systems that ensure reliable and continuous load supply through controlled transfer from two or more independent a.c. power sources.

Static transfer systems covered under IEC 62310-2 are intended for use in single-phase, phase-phase, or three-phase applications with voltages up to 1,000 V a.c. The standard sets forth the EMC requirements, test methods, and minimum performance criteria for switching elements, their controls, and related protective devices, ensuring these systems operate without causing or experiencing electromagnetic interference in public or industrial environments.

Key Topics

• Scope and Applicability: IEC 62310-2 applies to both standalone units and assemblies intended to maintain load continuity by transferring supply between multiple independent sources. It does not cover systems for direct current (d.c.) source switching, single-source systems, or those using only electromechanical switching devices with interruption during transfer.

• EMC Requirements: The standard defines essential EMC parameters that an STS must meet to function reliably in typical operating environments. It addresses both emissions (conducted and radiated) and immunity (resilience to various types of interference).

• Test Methods and Performance Criteria: Detailed procedures are provided for verifying compliance, including test setups for both table-top and floor-mounted equipment. Minimum acceptable performance levels are stipulated based on intended installation type and system rating.

• Exceptions and Exclusions: Devices integrated within Uninterruptible Power Supply (UPS) systems or intended for specialized applications (such as vehicular, marine, airborne, or high-altitude deployments) are excluded. Additional requirements may apply for these cases.

Applications

Static transfer systems (STS) performing controlled transfer between multiple a.c. sources are widely used to ensure continuous power supply in:

• Data Centers and IT Facilities: To safeguard servers and critical IT infrastructure against power interruptions and to maintain service continuity.
• Hospitals and Healthcare Facilities: Critical medical equipment relies on seamless power transfers to maintain patient safety.
• Industrial Operations: Manufacturing plants and industrial automation systems use STS for uninterrupted operations, where even short power loss can be costly.
• Commercial Buildings: Essential services such as elevators, lighting, and security systems benefit from uninterrupted electrical power.

By adhering to the EMC requirements in IEC 62310-2, organizations can minimize the risk of electromagnetic disturbances adversely affecting sensitive equipment, and also ensure their STS installations are not a source of unacceptable emissions.

Related Standards

IEC 62310-2 complements several other key standards in the field of static transfer systems and electromagnetic compatibility:

• IEC 62310-1: General and safety requirements for static transfer systems.
• IEC 60947-6-1: Switching devices for electromechanical transfer systems.
• IEC 62040 series: Standards for Uninterruptible Power Systems (UPS).
• IEC 61000 series: General electromagnetic compatibility standards, including terminology, emission and immunity requirements, and test methodologies.
• CISPR 16 series: Measurement methods and instruments for radio disturbance and immunity tests.

Organizations seeking compliance with international best practices for static transfer systems should ensure alignment not only with IEC 62310-2 but also with related EMC, safety, and performance standards for comprehensive system security and reliability.

Keywords: IEC 62310-2, static transfer systems, STS, electromagnetic compatibility, EMC requirements, a.c. power continuity, IEC standards, power transfer, critical power systems