| 摘要 |
PROBLEM TO BE SOLVED: To make switchable collectively by one switching device at least one wiring system by providing two wiring systems through the use of a comparatively small number of wiring members. SOLUTION: Joint boxes 22 are connected with a main line Lm, comprising single-phase three wires connected with a trunk breaker 11. Each joint box 22 has a connector, which is connected electrically with a neutral conductor N, and one voltage line L1 of the main line Lm and has another connector connected electrically with the neutral conductor N and another voltage line L2 of the main line Lm. An outlet 21 is connected with each connector. Switching devices 13a, 13b for switching the respective voltage lines L1, L2 are interposed respectively between the main trunk breaker 11 and the adjacent joint box 22 thereto. |
