| 摘要 |
PURPOSE:To facilitate the maintenance and checking, by defining an opening between a closed switchboard installation floor and a circuit breaker chamber floor corresponding thereto and by using the front part of the opening as a control chamber and the rear part as a ventilation duct. CONSTITUTION:The control chamber 33, wherein terminals 32 for relaying a control line 31 for lead-in, etc. are provided, is defined between a door 20A and the ventilation duct 30 defined between a support plate 27 and the floor 29 for carrying a switchboard box 20. The support plate 27 is fitted with a rmovable cover 36, which closes a hole 36A that serves to communicate the circuit breaker chamber 26 with the control chamber 33. Therefore, the ventilation duct 30 and the control chamber 33 can be easily performed by removing the cover 36. |
