It had been replaced by IEC 61439-1 (and -2, -3, etc.). The older 60439-1 was now historical—useful for legacy equipment, but not for new designs.
Still, since Building 4’s switchgear was installed in 2005, she genuinely needed the old standard. iec 60439-1 standard pdf
Manufacturers who produced components for IEC 60439-1 boards (e.g., specific busbar systems, draw-out cassettes) still need the standard to ensure mechanical and electrical compatibility. It had been replaced by IEC 61439-1 (and -2, -3, etc
IEC 60439-1 was titled "Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested and partially type-tested assemblies". It specified the requirements for assemblies intended for the distribution of electrical energy and the protection of circuits in industrial, commercial, and residential applications. Manufacturers who produced components for IEC 60439-1 boards
| Feature | IEC 60439-1 (Old) | IEC 61439-1 (New) | | :--- | :--- | :--- | | Assembly Type | TTA and PTTA | Design Verified (DVA) | | Verification | Only physical type tests | Combination of tests, calculations, and simulations | | Temperature Rise | 40°C ambient (simplified) | Detailed current-carrying capacity calculations | | Short-circuit withstand | Based on specific arrangements | Verified via design rules for any arrangement | | Documentation | Minimal required | Extensive Technical Documentation (Routine verification) |
The bottom line: You cannot certify a new low-voltage switchboard to IEC 60439-1 today. Notified bodies will reject it.