Asked by sophie
why use a 3 wire system instead of a 2 wire system when wiring an electric heater with metal casing
So the metal casing can be "grounded" andnot aquire the potential lethal voltage if a 110 V wire inside becomes loose, wet or loses its insulation. If this happens, you could get a lethal shock just by touching the casing.
So the metal casing can be "grounded" andnot aquire the potential lethal voltage if a 110 V wire inside becomes loose, wet or loses its insulation. If this happens, you could get a lethal shock just by touching the casing.
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