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Non-Polarized plug and socket. |
Polarized power sockets are used in applications where interchanging the phase and the neutral conductors can result in shocks as in a toaster. Since the switch is connected to the phase line, send the phase supply through the neutral would mean that the appliance will have power even when it is switched off.
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Observe the difference in pin width |
A table lamp needs a polarized socket as interchanging the phase and the neutral lines would result in supply reaching the lamp holder even in the power off condition.