| 摘要 |
PURPOSE:To arbitrarily divide plural elevtric apparatuses connected in parallel with two power source lines connected with a single-phase power source into groups which ar on-off controlled by predetermined switches by utilizing a dependent line arranged along the power source lines. CONSTITUTION:A dependent line 4 is arranged in parallel with two power source lines 2 and 3 connected with a single-phase power source 1, electric apparatuses 10 such as lighting fixtures are connected between the line 4 and the line 3, terminals 6 and 7 are aranged for connecting switches 9 between the line 4 and the line 2, and the line 4 is fitted with interrupting switches which interrupt the line 4 on condition that the switches 9 are connected with the terminals 6 and 7. Thus, the apparatus 10 are divided into groups each of which is on-off controlled by the switche 9, i.e. by whether the switch 9 is inserted in the connection line 5 corresponding to the group or not. |
