Overview
IEC TS 62735-2:2016 is a technical specification developed by the International Electrotechnical Commission (IEC) that defines the requirements for direct current (DC) plugs and fixed socket-outlets specifically designed for information and communication technology (ICT) equipment installed in data centres and telecom central offices. This standard covers plugs and socket-outlets for class I equipment with two active contacts plus an earthing contact, supporting a rated power of 5.2 kW and a voltage range from 294 V to 400 V DC. Its primary objective is to ensure safe, reliable power connections for DC-powered ICT equipment in high-demand environments, promoting compatibility, safety, and efficiency.
Key Topics
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Rated Power and Voltage
The standard specifies plugs and socket-outlets with a rated power of 5.2 kW and a rated voltage range of 294 V to 400 V DC, directly supporting high-performance ICT equipment.
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Compatibility
Backwards compatibility is ensured: a 2.6 kW plug compliant with IEC TS 62735-1 can be used with a 5.2 kW socket-outlet as specified in Part 2. However, the higher-powered 5.2 kW plug cannot be used with a 2.6 kW socket-outlet, preventing unsafe electrical connections.
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Safety Features
- Earthing Contact: For enhanced protection against electric shock.
- Interlock Systems: Mandates either automatic or mechanical interlock mechanisms to prevent arcing during connection/disconnection.
- Protection and Testing: Specifies requirements for temperature rise, breaking capacity, mechanical strength, resistance to heat, and markings.
- Markings: Guidelines for “ON”/“OFF” denotation and visibility near switches.
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Physical and Mechanical Compliance
- Standardized dimensions and gauges ensure reliable fit and secure engagement.
- Requirements for terminals, conductor sizes, and pull/torque test values for secure cable connections.
Applications
IEC TS 62735-2:2016 is directly applicable to:
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Data Centres:
Ensures reliable and safe DC power delivery to servers, switches, storage devices, and related ICT infrastructure, critical for uninterrupted operation, high efficiency, and energy savings.
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Telecommunications Central Offices:
Supports robust DC power connections for telecom equipment, helping maintain network uptime and performance.
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OEMs and Equipment Suppliers:
Offers manufacturers a clear, internationally recognized specification for designing, testing, and supplying compliant plugs and socket-outlets for the global ICT market.
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System Integrators and Facility Managers:
Guides selection and installation of DC power distribution components, supporting best practices in safety and system compatibility within large-scale ICT environments.
Related Standards
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IEC TS 62735-1:2015
Part 1 of the series addresses the 2.6 kW DC plug and socket-outlet system, offering foundational compatibility information.
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IEC 60999-1
Provides safety requirements for electrical copper conductors and clamping units, relevant for screw-type and screwless DC plug/socket designs.
Practical Value
Implementing IEC TS 62735-2:2016 supports:
- Enhanced Safety: Through robust earthing provisions, interlocks, and rigorous testing protocols.
- International Compliance: Eases global deployment and procurement of DC-powered ICT infrastructure.
- System Reliability: Reduces risk of mismatched connections and equipment failure.
- Future-Proofing: Aligns with the industry trend toward higher voltage DC distribution in next-generation data centres and telecom hubs.
By adhering to IEC TS 62735-2:2016, stakeholders in the ICT and telecom sectors can ensure safer, more efficient, and internationally compatible DC power delivery systems for critical infrastructure.