An additional coating or surface treatment can be used.
To assess the performance of such treatments appropriate relevant international standards
may be used.
The IEC 60068 series gives information on environmental testing procedures and severity of
tests.
Characteristics of materials coatings and painting should be stated by the manufacturer.
Additional information is given in Annex F.
If the enclosure is part of the main earthing conductor system, precautions shall be taken to
prevent corrosion of the elements and contact surfaces in the earthing current path, in order
to maintain the current-carrying capacity during its expected service lifetime.