| 摘要 |
PROBLEM TO BE SOLVED: To perform grounding work of main circuit bus-bars surely and simply by putting a grounding device body on one of circuit breaker putting-on steps of a switchboard, and constituting a mechanism which connects grounding conductors by pushing the grounding device in, and cuts off the connection with the grounding conductors by drawing the grounding device body out. SOLUTION: The body of a front maintenance type enclosed switchboard 1 has a vertical partition wall 2, and at its back a bus-bar chamber 3 is formed. The front side is partitioned into three, the upper, center, and lower steps to form a circuit breaker chamber 4, a grounding device chamber 5, and a circuit breaker chamber 6. And each circuit breaker 7, 9, and a grounding device 8 are supported in a way reciprocatable in the backward and forward directions by the use of respective sliding mechasnisms. If the grounding device 8 is pushed into the back, here, the contacts 38 at the rear part of the grounding device 8 touch the conductors of a bushing 16, and ground bus-bars 14. Besides, if the grounding device 8 is drawn out to the front side and returned back to a standby position, its connection with the bus-bars 14 is cut off, and it becomes in a hooked and fixed state. |
