A Guide to ENA Engineering Recommendation G5/4-1

UK Trade Association Gambica has produced a simple authoritative introduction to good practice in the application of variable speed drives, soft starters and load regulators in compliance with Recommendation G5/4-1.

The Guide considers the installation of single or multiple drive systems, and provides information on the way connection should be made with the appropriate utility. It is important to understand that G5/4-1 is effectively an installation standard and applies to the total harmonic generating equipment installed by a consumer. It is not a product or equipment standard and no single items of equipment can be said to comply.

The intention of G5/4 is to ensure that the levels of harmonics in the Public Electricity Supply (PES) do not constitute a problem for other users of that supply. It forms part of the consumer’s agreement to connect, and it is the responsibility of the individual consumer to ensure that the appropriate procedures to agree connection of new loads are followed.

To facilitate the connection of non-linear equipment, G5/4-1 specifies harmonic current emission limits with the intention of limiting the overall voltage distortion to no more than the network planning levels specified in ER G5/4-1, which in turn are set to achieve compatibility.

G5/4-1 identifies consumers by their point of common coupling to the supply, and applies limits at that point. It applies to every consumer connected to the PES, including:

– Domestic

– Commercial, shop and office consumers

– Industrial users.

It is also very important that the consumer understands the responsibilities placed on him by the supply utilities to avoid the possibility of having to implement costly remedial measures in the event of a problem.

Download a free copy from the Gambica website

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