配分電盤の経済的配置に関する研究

Abstract

To keep the cost of the wiring of electrical equipments in a building economical, we have hitherto considered it is fundamental that substations, switchboards, and panel boards required should be installed close by load centers concerned. There has been a sharp accentuation of interest in and effort on, economical planning of interior wiring, i.e. to keep electrical equipment installation to load centers in close layout which would minimize the wiring costs. But our practical experiences show that it is very difficult to keep layout of electrical equipments close by load centers in a building as satisfactorily as electrical engineers desire by so many troubles. In some case, close layout is difficult to be carried out as planned by electrical engineers being change of planning necessary for close layout impossible in due time of construction schedule, nothing left except best alternative wiring to be planned. In another case, having time enough to plan close layout and to propose economical layout of switchboads and panel boards to an architect in charge of the building design, and very often no approval from an architect, because of no numerical values specified for close layout as measuring indices in evaluating close layout characteristics. Accordingly, unsatisfactory layout of electrical equipments and rather not economical wiring are carried out in a building, and very often in such cases, electrical engineers are allowed only to seek out the best layout within the limited conditions of the building plan given by an architect. In case of small total floor area, cost-up of wiring according to the unfit layout of electrical equipments to the load center, amounts not to so much as compared with the optimum wiring. But in case of large total floor area, cost-up brought by unfit layout amounts to so much as not negligible. If we can express cost-up rates in numerical terms according to off-distances from the load center considered desirable, we can have measuring indices in numerical terms sufficient to evaluate, and we can change some parts of building plan by positive recommendation effective to carry out general coordination between electrical engineers and an architect. And we can have economical layout of switchboards and panel boards. We must assign quantitative numbers to all the significant factors relative to the economical layout of switchboards and panel boards.