| Form | Description | |------|-------------| | Form 1 | No separation | | Form 2 | Terminals separated from busbars | | Form 3 | Terminals separated from busbars, and busbars separated from functional units (but not terminals of adjacent units) | | Form 4 | As Form 3, plus terminals of adjacent units separated (4a = terminals separated from busbars but not each other; 4b = all terminals individually separated) |
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Prior to 2014, the industry relied on the series. However, those standards were often criticized for lacking clarity regarding compliance responsibilities and verification methods. The transition to IEC 61439 introduced a more transparent approach to safety, replacing vague concepts like "Type Tested Assemblies" (TTA) with the rigorous methodology of "design verification" and "routine verification" for every assembly. iec 614391 and 2 pdf
Specifically, the standard allows for of a low-voltage switchgear and controlgear assembly:
The IEC 61439 series, published by the International Electrotechnical Commission, replaces the older IEC 60439 standard. It establishes the safety and performance requirements for low-voltage switchgear and controlgear assemblies (rated voltage not exceeding 1000 V AC or 1500 V DC). | Form | Description | |------|-------------| | Form
Limits upper-temperature reached by components to ensure longevity and safety.
: Modifies, replaces, or adds to the general rules found in Part 1. 2. Key Technical Parameters and Characteristics Can’t copy the link right now
Resistance to corrosion, UV radiation, and mechanical impacts.
The IEC 61439 series has significant implications for the electrical industry: