PURPOSE: To save an electric wiring space, to simplify a wiring operation and to perform the construction work of an increase without a service interruption by a method wherein apparatuses such as a circuit breaker, a transformer and the like are attached to a frame-assembled apparatus housing stand so as to be a unit.
CONSTITUTION: An at-hand circuit breaker 3, a transformer 2 and a branch board 7 are formed as a unit, a plurality of mounting support materials 22 are handed over to a frame 21, a primary-side circuit breaker 23, a secondary-side circuit breaker 24. a watthour meter 26 and the like are attached to it, and a transformer 25 is arranged in the central part. When the circuit breaker, the transformer and the branch board are formed as the unit, a secondary-side branch board 7 and a primary-side circuit-breaker board 8 are assembled in a unit-type power-supply apparatus 20. As a result, even when the depth of the power-supply apparatus is the same, its width can be made narrow by about 15%, its cost, its space and its execution property can be improved in all aspects as compared with those in conventional methods, and the construction work of an increase in the future can be executed without replacing a cable and without a service interruption.
KOSAKA MUTSUO
INOUE HIROSHI
FUKUDA EIJI
ODA MINEKO
FUJI ELECTRIC CO LTD