How does the electricity supplier turn Tariffs on and off

A device called a Zeilweger Relay (or more often today an Electronic meter) is installed by the electricity supplier into your main switchboard This device is controlled by messages sent down the electricity lines. A message is sent to switch the relay on and another message is sent to switch the relay off. For those technically minded types among us, a harmonic frequency of 50 Hertz is superimposed on the line. The relay changes state according to the frequency. This will sometimes cause a fluctuation in dimmed lights at the time the frequency is being injected into the network.

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