Overview
SIST EN IEC 60669-2-4:2026 specifies the particular requirements for manually operated, general-purpose isolating switches used in household and similar fixed electrical installations. The standard applies to isolating switches with rated voltages not exceeding 440 V and rated currents up to 125 A, suited for both indoor and outdoor applications. This second edition updates and replaces the previous edition (2004), aligning closely with IEC 60669-1:2017 and introducing new technical criteria for improved performance, safety, and versatility.
Isolating switches compliant with this standard are essential for safely disconnecting electrical circuits or equipment from supply networks during maintenance, installation, or in the event of faults, ensuring protection against accidental energization.
Key Topics
- Scope and Purpose: Covers isolating switches for household and similar installations, ensuring operational safety and reliability up to 440 V and 125 A.
- Updated Ratings: Expanded to include isolating switches rated from 6 A to 13 A, as well as higher currents (80 A, 100 A, 125 A).
- Compatibility: Refers to IEC 60669-1:2017 for general requirements, with additional clauses specific to isolating switches.
- Motor Loads: Now includes requirements for monophase motor load circuits up to 10 A and power factor not less than 0.6.
- Marking and Identification: Enhanced marking requirements ensure clear identification of switch position (ON/OFF), isolating function, and rated conditional short-circuit current.
- Testing and Performance: Detailed requirements for mechanical strength, electrical endurance, insulation, temperature rise, and short-circuit withstand capabilities.
- Installation Flexibility: Suitable for both indoor and outdoor installations; designed for surface and flush mounting.
- Safety Considerations: Focus on protection against electric shock, proper earthing, and mechanical durability.
- Technical Updates: Revised tables for terminal torque values, conductor dimensions, and current ratings.
Applications
Isolating switches that conform to SIST EN IEC 60669-2-4:2026 are widely utilized in:
- Residential Electrical Installations: Main isolation for individual circuits or the entire installation during maintenance or in emergencies.
- Commercial Buildings: Panel boards, distribution boards, and switchgear where frequent manual isolation is necessary.
- Outdoor Electrical Equipment: Garden lighting, HVAC units, pump controls, and other units that require local isolation.
- Small Motor Circuits: Equipment and appliances with motor loads up to 10 A, benefitting from clear isolation and safety guarantees.
- Renovations and Upgrades: Ensures existing installations meet contemporary safety and performance standards through compliant switch replacements.
Proper use of isolating switches in accordance with this standard enhances safety, simplifies servicing, and helps prevent accidental electrical hazards.
Related Standards
For comprehensive compliance and optimal safety in electrical installations, consult the following related standards:
- IEC 60669-1:2017 (EN 60669-1:2018): General requirements for switches for household and similar fixed electrical installations.
- IEC 61180:2016 (EN 61180:2016): High-voltage test techniques for low-voltage equipment, relevant for insulation and electric strength testing.
- IEC 60664-1:2020 (EN IEC 60664-1:2020): Insulation coordination for equipment within low-voltage systems.
- IEC 60998, IEC 60999, IEC 60228: Connectors and conductors used within installations, referenced for compatibility and safety integration.
Adhering to SIST EN IEC 60669-2-4:2026 ensures that isolating switches meet the latest performance, safety, and durability benchmarks required for modern electrical installations. This standard supports installers, specifiers, and manufacturers in delivering compliant, reliable, and safe electrical isolation solutions.
