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In the Netherlands, you usually need to use a junction box, which can be covered up by the base flange. In Belgium this is mostly not necessary, the Modular Lighting Nomad is installed directly on to the ceiling.
How the installation with base flange is done, is explained and illustrated on this page.
The base flange for the Modular Lighting Nomad is not a requirement, but can be used to mount it when you need to cover a hole in the ceiling.
For instance, when you have a ceiling recessed box in the ceiling, you will not be able to mount the Nomad by itself.
In this case you can mount the Nomad in combination with the base flange.