IEC 62949:2017

Overview

IEC 62949:2017, titled "Particular safety requirements for equipment to be connected to information and communication technology networks," is an international standard published by the International Electrotechnical Commission (IEC). It focuses on safety requirements for equipment interfaces intended to connect as communication terminals to ICT (Information and Communication Technology) network terminations. This standard specifically addresses the interface safety aspects and excludes equipment already covered by IEC 62368-1 or equipment interfaces to other networks.

The standard aims to protect users, service personnel, and network equipment by establishing limits on voltages and currents, defining protection measures against hazardous electrical conditions, and specifying criteria for safe interconnection with ICT networks. It serves as a complement to other safety standards by concentrating on hazards encountered at the equipment-to-network interface.

Key Topics

• Scope and Application IEC 62949:2017 applies only to equipment interfaces connecting to ICT network terminations, excluding equipment governed by IEC 62368-1 and interfaces to other network types such as HBES/BACS.

• Safety Requirements The standard emphasizes three key safety areas:

  • Protecting equipment users from hazards arising within the equipment itself (covered by other standards).
  • Safeguarding skilled persons and instructed personnel handling ICT network connections from hazardous network voltages or conditions.
  • Protecting equipment users from voltage surges or overvoltages present on ICT networks.

• Classification of Circuits (ES1, ES2, ES3) The document defines limits and protection methods for different types of telecommunication circuits designated as ES1, ES2, and ES3, each bearing specific electrical characteristics and risk profiles.

• Protection Measures Measures include limiting touch current, ensuring proper isolation of ICT network circuits from earth, and preventing overheating of the network wiring system.

• Testing and Compliance IEC 62949 specifies compliance criteria and test methods aligned with the safety principles outlined in IEC 62368-1 but tailored for ICT network interfaces. It also involves reference to IEC TS 60479 for electrical hazard evaluation.

• Informative Annexes The document includes annexes covering relevant related safety standards, ICT network voltages and signals, terminology comparison across IEC standards, and an overview of network types. These provide additional context for implementation.

Applications

IEC 62949:2017 is essential for manufacturers, designers, and testing laboratories involved in developing or certifying information and communication technology equipment such as:

• Communication terminals connecting to PSTN, ISDN, or other ICT networks
• Network termination devices in telephony systems
• Data communication devices that interface with ICT infrastructures
• Equipment used in environments where network signal voltages and currents require strict safety compliance
• Devices requiring protection against contact with hazardous voltages or overvoltages in communication lines

This standard enhances device reliability and user safety by ensuring that equipment interfaces meet internationally recognized safety criteria before reaching the market. It is particularly relevant in sectors where ICT communication devices are widespread, including telecom, enterprise networking, and consumer electronics.

Related Standards

IEC 62949:2017 should be used in conjunction with other pivotal standards, for a comprehensive safety framework:

• IEC 62368-1: Covers safety for audio/video, information, and communication technology equipment but excludes some ICT interface specifics addressed by IEC 62949.
• IEC TS 60479: Provides guidelines on the effects of current passing through the human body, foundational for establishing electrical hazard limits.
• EN 50491-3: Governs Home and Building Electronic Systems/Building Automation and Control Systems, representing network types excluded from IEC 62949's scope.
• Other standards listed in Annex A of IEC 62949 cover additional safety aspects that may apply depending on environmental conditions such as temperature extremes, moisture, vibration, or specialized industry requirements.

Conclusion

IEC 62949:2017 is a specialized international safety standard that ensures the safe interconnection of equipment to ICT networks by defining stringent interface requirements. Its focus on electrical safety at the communication terminal interface and protection against hazardous voltages or currents makes it an indispensable resource for ICT device manufacturers, safety engineers, and compliance officers worldwide. Adhering to IEC 62949 enhances product safety, user protection, and overall system reliability in telecommunications and data communication domains.

Keywords: IEC 62949, ICT network safety, communication terminal interface, electrical safety standards, equipment safety requirements, network termination equipment, IEC standards, overvoltage protection, telecommunication safety.