Assemblies may be classified according to different
Factors :
by the constructional typology, by the external design, by
the installation conditions, by the function carried out.
Open-type and enclosed assemblies
According to the constructional typology the Standard
IEC 61439-1 distinguishes between open-type and enclosed assemblies.
- Enclosed assembly
An assembly is enclosed when there are protected
panels on all its sides so as to provide a degree of
protection against direct contact not lower than IPXXB
(see Chapter 4). Assemblies intended to be installed
in common environments shall be of enclosed type
- Open-type assembly
An assembly, with or without front covering, in which
the live parts of the electrical equipment are accessible. Such assemblies can be used only in places
where skilled persons have access for their use.
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