IEC 62271-102:2018

Overview

IEC 62271-102:2018 is the International Electrotechnical Commission standard that specifies requirements for alternating-current (AC) disconnectors and earthing (ground) switches used in high-voltage switchgear and controlgear. It applies to indoor and outdoor installations for nominal voltages above 1 000 V and service frequencies up to and including 60 Hz. The second edition (technical revision) and its extended/amd. versions consolidate updated clause numbering, broadened scope, revised ratings and test procedures, and new annexes for current-switching capability, test tolerances and type-test validity.

Key topics and technical requirements

• Scope and application: Covers AC disconnectors and earthing switches, including switching devices with disconnecting/earthing functionalities used alone or as part of assemblies.
• Ratings and classifications: Rated voltages, insulation levels, short-time and peak withstand currents, bus-transfer current/voltage ratings, ice-coating ratings, and new classifications for mechanical endurance (including a new M1 class for earthing switches).
• Design and construction: Requirements for gases/liquids, earthing arrangements, auxiliary/control circuits, interlocking, position indication and signalling, creepage distances, mechanical strength and protection degrees (IP/IK).
• Switching capabilities: New classifications for bus-charging and induced-current switching capabilities and criteria for short-circuit making capability of earthing switches.
• Testing and validation: Revised type tests, tolerance tables, mandatory high/low temperature tests when service limits exceed +40 °C or −5 °C, practical procedures for position-indicator verification, mechanical interlock testing, and modified single-phase test voltages for non‑simultaneous closing earthing switches.
• Safety and operational limits: Updated isolating distance compliance, operating force limits, and strengthened requirements for interlocking and position-indicating devices.

Practical applications - who uses this standard

• Manufacturers of high-voltage disconnectors and earthing switches for design, production and type testing.
• Utilities and grid operators for equipment selection, procurement specifications and safe operation in substations.
• Electrical engineers and specifiers writing tender documents and system designs that require compliance with international HV switchgear practice.
• Test laboratories and certification bodies conducting type tests, endurance and environmental qualification.
• Consultants and asset owners ensuring interoperability, performance and safety across indoor/outdoor installations.

Benefits

• Ensures consistent safety, reliability and interoperability of disconnectors and earthing switches.
• Provides clear test methods and acceptance criteria for type approval and factory testing.
• Helps align equipment design with modern grid requirements (bus-transfer, ice-loading, temperature extremes).

Related standards

• IEC 62271-1 - Common specifications for AC switchgear and controlgear
• IEC 60071-2 and IEC TR 62271-306 - Insulation coordination and altitude correction guidance
• IEEE Std C37.100.1 - Related equipment definitions and harmonization references

Keywords: IEC 62271-102, high-voltage switchgear, disconnectors, earthing switches, AC disconnectors standard, type tests, mechanical endurance, bus-transfer current, isolating distance.