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QuestionsHow do you test the durability of plastic enclosures against heat and fire?
Simon Smith asked 2 years ago
1 Answers
Chris Lloyd Staff answered 2 years ago

Dear Simon,

Excessive heat and fire can compromise the performance and functional integrity of electrical enclosures. We are committed to ensuring that these components can withstand these harsh conditions, which can take place in case of overloaded connections or overheating components.

To offer this level of protection, we evaluate the durability of our plastic enclosures against excessive heat and fire by using an indirect flame method, known as glow wire test, in line with IEC standards. This determines the tendency of a product to resist ignition. If ignition occurs, the procedure can provide an insight into the ability of the object to self-extinguish flames as well as prevent the spread or propagation of fire via dripping.

To determine these capabilities as specified by international standards, the equipment under test is first in place and a thin cotton fiber cloth or ‘tissue’ paper is positioned directly below it. The sample is then brought into contact for 30 seconds with a hot filament, whose exact temperature depends on the product being examined. More precisely, parts containing live components are exposed to 960°C ± 15°C, cavity wall parts to 850°C ± 15°C for cavity wall parts and all other components to 650°C ± 15°C.The test is passed if the enclosure does not burn, glow or if, after removing the filament, the glow is extinguished independently within 30 seconds. Also, the tissue paper must not be ignited by falling parts from the sample.

By conducting this test on our products, we can deliver solutions that effectively protect the equipment they contain as well as their surrounding environment. For additional information on the variety of tests we conduct and the methods we follow, visit: https://www.spelsberg.com/service/technical-information/technical-information/tests-and-test-methods-according-to-iec-/en-standard/

If you are interested in knowing more about our commitment to quality, check: https://www.spelsberg.com/about-us/quality-promise/quality-promise/

If you have additional questions on our testing capabilities, our quality promise or specific requests for your intended application, please feel free to send me a private message to discuss them.

Kind regards,