一、工程概况
        本工程为唐山市宏扬花园商住楼工程，位于唐山市火炬路西侧，由唐山宏扬房地产开发公司招标筹建，唐山国旺建筑安装有限公司中标承建。工期为333天，要求2001年10月10日开工，2002年10月30日竣工交付使用。该工程由唐山市规划建筑设计研究院设计，建筑平面为5单元组合条式住宅楼。建筑面积为16757.66M2（其中地下室面积2310M2）。地下是一层半地下室，地上主体为六层。地下室层高2.2M，首层层高为3.6M，二层层高为3.0M，三至六层层高为2.9M，单元组合为一梯两户，一二层为商业用房，三至六层为住宅。该工程为框架结构。方案编制依据《施工现场临时用电安全技术规范》（JGJ46-88）、《建设工程施工现场供电安全规范》GB50194-93，《建筑施工安全检查标准》 （JGJ59-99）、《河北省〈建筑施工安全检查标准〉实施细则》等关于施工用电技术规范标准。
 
二、配电系统的布置
    １、系统形式选择
    本工程采用２５０ＫVA变压器直接供电。根据施工平面图中各用电设备的位置、数量
First, project survey
        To carry forward this project in Tangshan City Garden composite construction, is located in Tangshan City, torch Road west, real estate development company from the Tangshan Hong Yang, tender preparation, construction and installation, Ltd. Tangshan Guo wang bid construction. Duration of 333 days, requested October 10, 2001 started on Oct. 30, 2002 completion of delivery. The project by the Tangshan City Planning and Design Institute of Design, Architecture flat strip combination for the 5 unit residential building. Construction area 16757.66M2 (including basement area of 2310M2). Ground is a layer of semi-basement, main floor for the six. Basement storey 2.2M, first floor storey to 3.6M, two-story story is 3.0M, three to six layers high as 2.9M, unit mix is a ladder two and one two-story commercial buildings, three to six-storey residential. The project for the frame structure. Programming based on "the construction site of the temporary electrical safety specifications" (JGJ46-88), "Supply Project Construction site safety standard" GB50194-93, "construction safety inspection standards" (JGJ59-99), "Hebei Province < construction safety inspection standards for> the implementation details "and other technical specifications on the construction of power standards.
 
Second, the arrangement of power distribution system
    1, the system to select
    This works directly with 250KVA transformer power supply. According to construction plan of the location of all electrical equipment, the number of