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Matching loads in LV assemblies with the electrical installation

Matching loads in LV assemblies with the electrical installation

BE EN IEC 61439-2 Edition 3: 2021 is the reference for industrial and commercial low-voltage assemblies. Compared with the previous edition it includes one very significant change, the introduction of a new characteristic, ‘group rated current of a main circuit of an assembly’.

This paper suggests ways in which the new characteristic enables 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.

The purpose of this whitepaper is to briefly mention some of the more significant changes and then to focus on the one fundamental change – the opportunities it brings and the care that is needed to ensure it is used correctly.

Key Learning Points

  1. The importance of correctly specifying the design current ratings within an installation.
  2. The assembly manufacturer’s responsibilities for thermal performance when designing and manufacturing a low-voltage assembly
  3. How to optimise a low-voltage assembly with the needs of the electrical installation.

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