Dear Members, I recently encountered a symptom on a toaster. When turning off by pressing the quit button, there was an arc flash from the mains switch contacts to earthed parts where the separation greater than 1 inch apart in air occasionally. The mains contacts have a sign of carbonisation on the open/close contact points and melted in a small area of the contact leaf. The switch and the earthed parts are inside the plastic case without the access by the users. It may trip the RCD during arc flash. In addition, there was vaporised copper layer on the earthed part. It did not have immediate danger to the user and definitely not a good product. How should we categorise this type of fault and is there any reference standard for it?
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