Three-phase meter if the incoming line and the outgoing line are reversed, then the meter reversal may occur, because the three alternating current is polar, is directional, so in the three-phase meter wiring must pay attention to the polarity of the meter current, to ensure that in accordance with the correct direction of wiring, if the current incoming line and outgoing line if the reverse connection, then the electric power is negative. The meter will reverse
Three-phase meter inlet line and outlet line are all reversed will lead to the meter reversal, the inlet and outlet line is reversed, the meter reading will be less than one phase measurement offset, and the inverse two roots will be less than 2 phase measurement offset, and the direct reversal.