| 摘要 |
PURPOSE:To provide a closed switch board wherein, when a plurality of electric apparatuses are accommodated there in multistages lengths of conductor accommodating chambers corresponding to unit chambers, respectively are made longer at the lower stages, that is, formed stepwise, thereby reducing temperature rise due to accommodated conductors. CONSTITUTION:Laminated and divided unit chambers 17 to 19 are provided in a frame 1, and electric apparatuses 6 through 8 and conductors 11 through 13 connected to said apparatuses are accommodated in said unit chambers. Furthermore, the lengths of conductor accommodated chambers positioned at the back parts of respective unit chambers 17 through 19 are formed longer at the lower stages, and the connections at the outside of the board of the electric apparatuses with respect to the conductors 11 through 13 are performed by studs 11' through 13' at the conductor lead-in ports 14 of respective unit chambers 17 through 19, and air inlet ports 16 of respective unit chambers 17 through 19 are provided at the lower parts and upper parts of unit chambers 17 through 19. Accordingly, since conductor parts in the chambers become short, and respective unit chambers are cooled independently, temperature rise within the board due to the heat generated in the conductors can be reduced. |
