The IEC 61439-1 standard, "Low-voltage switchgear and controlgear assemblies – Part 1: General rules," establishes the foundational safety and performance requirements for low-voltage electrical systems. It replaces the older IEC 60439 series, moving to a unified "design verification" approach involving testing, comparison, or assessment, rather than the previous TTA/PTTA classification. For more information, read the guide at
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Shared Responsibility: Distinguishes between the Original Manufacturer (who designs and verifies the system) and the Assembly Manufacturer (who builds the final unit). The design verification reports exist and are available
Even with the PDF in hand, errors occur. Here are the top five mistakes: Part 7: Common Mistakes When Using IEC 61439-1