IEC 60439-1 formerly defined international standards for low-voltage switchgear and controlgear assemblies, emphasizing Type-Tested Assemblies (TTA) and Partially Type-Tested Assemblies (PTTA). This standard has been superseded by the IEC 61439 series, which provides stricter design verification guidelines. For the current, applicable standards, visit IEC Webstore . INTERNATIONAL STANDARD IEC 60439-1
While the IEC 60439-1 PDF is no longer the active standard, it is still useful for reference, particularly when inspecting older installations or maintaining legacy equipment.
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One of the most famous aspects of the IEC 60439-1 PDF documentation was the distinction between TTA and PTTA:
If you'd like, I can help you with more specifics regarding: The between 60439 and 61439. A checklist for design verification under the new rules. Guidance on short-circuit ratings for busbar systems. INTERNATIONAL STANDARD IEC 60439-1 While the IEC 60439-1
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(International Electrotechnical Commission standard 60439-1) was titled "Low-voltage switchgear and controlgear assemblies - Part 1: Type-tested and partially type-tested assemblies." A checklist for design verification under the new rules
Confirming that the physical structure and busbars can survive the massive magnetic forces generated during a fault.