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For gaskets used to seal a component to prevent water entry in an outdoor enclosure, does Annex Y require a UV radiation test on the gasket in addition to regular gasket tests?

More specifically us asked: For outdoor enclosures, non-metallic parts require compliance with UV radiation requirements in Annex Y.2. If a gasket is used to seal a component to prevent water entry, does it require a gasket UV radiation test per Y.2 in addition to gasket tests per Y.4, or does it only require normal gasket tests per Y.4?

 

All references are to IEC 62368-1:2018, in which IEC 60950-22 (Outdoor ITE) content has been incorporated into Annex Y (Construction requirements for outdoor enclosures) and other parts of the Standard.

 

UV radiation testing per Y.2 normally is not required on gaskets in addition to normal gasket testing per Y.4.

 

UV radiation testing is required for polymeric materials exposed to radiation such as sunshine.  When polymeric materials are exposed to UV radiation for long time, materials can be embrittled. As a result, safeguards, such as electrical enclosures, can be defeated over time, and ordinary persons could be exposed to hazardous energy sources.

 

In general, gaskets are enclosed between enclosures along a joint rather than directly being fully exposed to UV radiation.  Therefore, it is the view of IEC TC108 and 62368-1 that such constructions do not require a UV radiation test, only general gasket tests in accordance with Annex Y.4.

 

This guidance is consistent with the IEC TC108 Interpretation Panel Question Q01 (published as 108/642A/INF), which has the same opinion for cable gland (gasket) evaluated to IEC 60950-22.  A gland (gasket) does not require UV testing since the UV radiation will not penetrate into the whole gland/gasket.  Please search for 108/642A/INF at the following database -https://decisions.iecee.org/iecee/SearchCMC.nsf/de_h.xsp?v=iectc.

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