Why do we need zero in a three-phase counter?
The balancing transformer has its own zero, the input mains zero is not connected to the load. Will the electric meter run if only three phases are connected to the transformer? What is zero on the counter for?
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Zero is needed for the correct operation of the meter, zero is needed to power the voltage windings. In any case, if it is necessary to connect a zero according to the scheme, then in its absence representatives of the supplying organization will consider this a violation and may result in a fine.