When an electrical enclosure is made of a ferrous metal it must be tested according to the requirements of AS/NZS 61439. Non-ferrous enclosures do not need to be tested for corrosion resistance as they are generally not subject to corrosion.
There are two types of corrosion resistance testing:
Severity Test A
This is suitable for indoor enclosures. The test involves 8 days of testing in a chamber exposed to high temperatures, humidity and salt mist according to IEC 60068-2Severity Test B
This is suitable for steel outdoor enclosures. This test involves 24 days of testing in a chamber exposed to high temperatures, humidity and salt mist according to IEC 60068-2-30 and IEC 60068-2-11. This is a much more heavy duty test.Material Selection
It outlines materials that can tolerate the environmental conditions in which assemblies will be installed. Materials with improved corrosion resistance are needed for outdoor and harsh environmental conditions.Protection Ratings
IP ratings define the Ingress Protection ratings in AS 61439. This is very important in ensuring protection of the assemblies from dust and moisture. A higher IP rating normally means a more solid environment, particularly on corrosion resistance.Testing and Certification
Testing of the assemblies is done for many types of performance under various conditions. One such test would be for corrosion resistance, especially if the assemblies are to be used in a corrosive environment.Design and Coating
All design of assemblies, including coatings and finishes, is important in resistance to corrosion. AS61439 promotes the application of coatings and treatments that increase the durability of assemblies against corrosion.Maintenance and Inspection
Through proper planning and carrying out, regular maintenance and inspection will ensure that corrosion does not affect the performance of the switchgear. Proper guides on maintenance procedures should be in place to correct any anomaly that may arise; this is what the standard implies.We design and manufacture high-quality switchboards. Contact us today to discuss your requirements and get started!