UV Stability of Electrical Conduits
Laboratory test according to DIN EN ISO 4892-3
Outdoors conduits are exposed to varying environmental factors (UV radiation, temperature, humidity ...) These factors ar called "weathtering".
UV stability or weathering resistance of plastic materials is tested under laboratory conditions according to DIN EN ISO 4892-3 (this test is also referred to as evaluation of fastness to weathering or resistance to fading): During a time period of 1000 hours conduits are exposed to an average temperature of 50 °C and alternating exposure to UV radiation, water fog and condensation to simulate rain.
Which conclusions can be drawn from test results?
As the level of solar radiation varies from location to location, it is not possible to give an overall statement on UV-stability under natural conditions. For specific references it would be necessary to know the exact place of installation. .
Level 1: Indoor use - to avoid UV discoloration (no exposure to direct sunlight)..
Level 2*: Partially shaded: Outside, in areas with sun only for two to four hours a day, in shadowy places
Level 3: Full sun: To be used also in areas with whole-day exposure to sunlight, e. g. roofs, antenna poles or PV panels