Adaptation of LV assembly loads to the electrical installation

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The means of coordinating the current ratings of low voltage assemblies with those required by the electrical installation are not clearly defined. By the introduction of a new feature, the newly published version of BS EN 61439-2 Ed 2 provides an opportunity for improvement, assuming specifiers and the manufacturer fully understand and embrace the change as detailed in this article.

BE EN IEC 61439-2 Edition 3: 2021 is the reference for industrial and commercial low voltage assemblies. Compared to the previous edition, it includes a very important modification, the introduction of a new characteristic, “nominal group current of a main circuit of an assembly”.

This article suggests ways in which the new feature allows the installation designer and assembly manufacturer to work together in a partnership to achieve a cost-effective assembly without compromising the needs of the installation.

Key learning points:

  • The importance of correctly specifying design current ratings in an installation
  • Responsibilities of the assembly manufacturer for thermal performance when designing and manufacturing a low voltage assembly
  • How to optimize a low voltage assembly with the needs of the electrical installation

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