binations it is necessary to match the different features of the individual components - the technical details to be considered are described in standard IN EN 60439-1(“Low-voltage switchgear combinations; part 1: Type-tested and partially type-tested assemblies“).
The proof of requirements for fulfilling the basic legal principles for low-voltage switchgear assemblies may be provided in line with the declaration of conformity and CE labelling by applying the standard mentioned above. The manufacturer must observe the relevant standards at the planning stage as well as in manufacturing, assembly and plant documentation.
This basically means for the manufacturer that there are the following variant options according to the above mentioned standard:
* Variant 1:
type-tested assemblies (TTA)
* Variant 2:
partially type-tested assemblies (PTTA)
The first variant comprises the testing of a ready-to-use system in an accredited testing laboratory. The test equipment must correspond to the technical scope and features of the system that will be installed on-site.
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