| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage line changeover switch suitable for balancing the electric power in each polarity when the electric power consumed by each polarity becomes unbalanced for the neutral wire. SOLUTION: Provided between a main line 8, comprising a neutral line 2 and voltage lines 4, 6 and branch circuits C1 to Cn connected to the neutral line 2 and branched from the main line 8, a switch is changed over to either of the voltage lines 4, 6, to which each of the branch circuits C1 to Cn is connected. This causes an effect which is obtainable that the electric power in each polarity can be comparatively easily balanced simply by changing over the switch, when the electric power consumed in each polarity becomes unbalanced with respect to the neutral line 2. |
