Overview
IEC 60669-2-4:2024 - "Switches for household and similar fixed electrical installations - Part 2-4: Particular requirements - Isolating switches" is the 2nd edition (2024) of the International Electrotechnical Commission standard covering manually operated general-purpose isolating switches for household and similar fixed electrical installations. It applies to switches with a rated voltage ≤ 440 V and a rated current ≤ 125 A, suitable for indoor or outdoor use. This edition updates the 2004 standard, aligns references with IEC 60669-1:2017, and introduces several technical revisions.
Key recent changes include:
- Alignment with IEC 60669-1:2017 references and clauses.
- Introduction of ratings for isolating switches from 6 A to 13 A.
- Addition of a circuit motor load (rated current ≤ 10 A, power factor ≥ 0.6) in the scope.
- Modifications to Table 1 and Table 5 (rating and test data).
Key technical topics and requirements
The standard provides detailed requirements, tests and classifications that manufacturers, test labs and designers must consider:
- Ratings and combinations: Rated voltage, rated current (up to 125 A), preferred pole/rating combinations and conditional short‑circuit current values.
- Marking and identification: Visibility, durability and terminal marking for phase, neutral and earth.
- Protection against electric shock: Prevention of access to live parts, insulation and earthing provisions.
- Terminals and connections: Screw and screwless terminals, correct insertion, contact pressure and conductor accommodation.
- Mechanical and thermal performance: Mechanical strength, endurance, temperature rise and resistance to ageing/heat.
- Electrical performance: Insulation resistance, electric strength, impulse voltage tests, making and breaking capacity, short‑circuit withstand and coordination with SCPDs.
- Environmental and enclosure requirements: IP protection, resistance to humidity, ingress of solids/liquids and resistance to tracking and fire.
- EMC, markings and mechanical safety: EMC immunity, indication of contact position, and requirements for covers, actuating members and cord-operated switches.
(These topics are reflected across clauses such as 6 - Ratings, 8 - Marking, 10–13 - Safety & construction, 16–18 - Electrical tests, 20–24 - Mechanical and material tests.)
Practical applications
IEC 60669-2-4:2024 is used to:
- Design and certify isolating switches for domestic, residential and light commercial fixed installations.
- Specify performance for indoor and outdoor switch products up to 440 V/125 A.
- Define test procedures for manufacturers and test laboratories to verify making/breaking capacity, short‑circuit withstand, temperature rise and mechanical durability.
- Support product compliance, procurement specifications and regulatory approvals.
Who should use this standard
- Switch and component manufacturers
- Design and R&D engineers for residential electrical products
- Type‑test and compliance laboratories
- Certification bodies and national standards organizations
- Electrical installers, specifiers and procurement teams requiring compliance data
Related standards
- IEC 60669-1:2017 - General requirements for switches for household and similar installations (referenced and incorporated into this edition).
- Other national or regional wiring and safety regulations relevant to fixed electrical installations.
Keywords: IEC 60669-2-4:2024, isolating switches, household electrical installations, rated voltage 440 V, rated current 125 A, switch standards, switch testing, IEC 60669.
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