The standard applies to enclosures of, or for housing, electrical equipment with a nominal voltage not exceeding 72.5 kV. The standard applies only to enclosures that are in all other respects suitable for the intended use and which, in terms of materials and construction, ensure that the properties described in this standard are maintained under normal operating conditions.
NEN 2438-1985 history
1985NEN 2438-1985 Enclosures for electrical equipment Degrees of protection (IP-designations)