which part of the electric heater must be earthed??
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The outer metallic case of the electric Heater should be earthened
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The outer metallic case of the appliance is earthed as it is used to prevent electrocution of people handling the device. Earthing is accomplished by connecting the device to the ground through an earth wire. If an earth wire is provided, it means that the current flowing through it to the ground has a very low resistance path, preventing the individual from receiving a shock
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