Extremely thick copper wires allow the meter to be wired in series with a household's main power supply. They're capable of handling 200 Amps!
Interestingly, the meter relies on a black ring-shaped current transformer installed around the copper wires to send power consumption signals to the main board.
Current transformers indirectly measure the current flowing through the thick copper conductors and provide an output that can be read by the electronics on the board.
Long metal pressure contacts along the inside case of the meter conduct 240V AC electricity to pads that provide power to the main board.
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