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Know your electric appliances: Class II

Know your electric appliances: Class II
A double square of this kind appears in appliances that were designed to isolate voltage sources so theoretically an electric shock is not possible. The insulation may appear in multiple forms to achieve this goal, normally using non-conductive materials like plastics. If the appliance doesn't derive voltage where the user…
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Know your electric appliances: Class I

Know your electric appliances: Class I
The symbol of the image means something really important, as it indicates the necessity of having a three prong electrical system, with earth. Earth means somewhere there is a ground rod —a piece of metal normally with a solid tube geometry— that is buried in the ground, with direct contact…
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