Plug-in installation: system compatibility and system responsibility

Published on 14 April 2026Time to read: 2 minutes

Plug-in installation has become an integral part of electrical installation practice. It saves time on site, reduces failure costs, and ensures a clear and well-organised installation. However, combining different connectors and systems sometimes raises questions: are they system-compatible, and who is responsible for the connection?

What do the standards say?
For plug-in connections used as permanent parts of installations, the product standard NEN-EN-IEC 61535 applies. This standard describes the safety and functional requirements for installation connectors.

It is important to note that this standard defines how connectors must be tested, but does not prescribe universal dimensions or interoperability between manufacturers. Connectors from different manufacturers are therefore not automatically system-compatible.

In addition, the complete installation must of course comply with the requirements of NEN 1010.

Test report or certification?
Connectors are often tested by certification bodies such as VDE or DEKRA. The result is sometimes a test report. Such a report shows that a specific combination of connectors has been tested in a laboratory environment.

However, this does not mean that all variants or other combinations are automatically approved. A test report only applies to the specific products that were tested.

Certification goes further: it also assesses product design, documentation, and often production control.

What does this mean in practice?
Within an installation, components must be used in accordance with the manufacturer’s specifications and installation instructions. When components from different manufacturers are combined, the question may arise as to who is responsible for the performance of the connection.

Consider, for example:

mechanical fit of connectors
electrical contact quality
thermal behaviour under load
repeatability in future deliveries

That is why it is important that system responsibility is clearly defined within a project.

Practical choice on site
In projects where clear documentation, repeatability, and responsibility are important, a single plug-in installation system from one manufacturer is often chosen. This makes inspections, quality control, and maintenance much more straightforward.

In conclusion
Plug-in installation offers major benefits in speed and efficiency. By carefully assessing system compatibility, system responsibility, and documentation in advance, you can avoid disputes afterwards and ensure the installation remains safe and reliable.

Do you have questions about plug-in installations, system compatibility, or system responsibility? We are happy to think along with you.

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