【正文】 ion, the depth of the provisions39。 requirements are quite mon, mainly in terms of design documents can be implemented deficiencies will lead directly to construction and installation problems or errors May also lead to lack of availability. Required depth because they do not carry out the necessary calculation and labeling, but also often result in the design principles of the document itself appears rather difficult to discover the error will affect the project pletion of use. For example, according to the depth of that pow er and l ighting system diagram and the corresponding equipment and materials should be detailed in the table indicate choice of electrical equipment and materials model, name, size and quantity parameters. Since the reform and opening, China39。s colorful electrical products market at home and abroad dazzling array of products for various models specification, the state can not be all types of electrical equipment and materials to establish a unified model. Designed to identify a variety of equipment and materials par ameters of the model specification appears to be particularly important, it is the owners or 中原工學(xué)院畢業(yè)設(shè)計（論文）譯文 10 construction equipment units orders and procurement basis. In recent years, electrical design documents, however, generally used only in the system diagram of the device symbol next to the annotation of the models or the device manufacturer product number, so that equipment orders at a loss, and often lead to errors. Such as electrical lighting design of a project, the designer in the system diagram of the circuit breaker marked only the symbol next to the 39。A063M 20A39。, devices in the table is no exception, but have not specified the name and details of parameters, the construction unit interpreted as a regular 20A circuit breaker, because to find less than the number of products under a separate procure ment of another circuit breaker. The equipment and materials after the inspection by the supervisors check when the original 39。A063M39。 Naishi Haig39。s a kind of electromagic leakage circuit breaker product number, rated current 20A, rated residual operating current of 30mA. Shows that the original design of these Loop based leakage should be protected. Unclear but the design mark caused by ordering errors. Had to repurchase the replacement. Anotherexample is the construction of many electrical diagram of the cable trench marked only the size and direction of the cable bracket and the cover does not make any provision, or only marked 39。refer to page XX Atlas XX39。, in fact plotting the country focused on either the size cable trench, its cable bracket and cover practices have provided a number of options for the design selection, design is not selected then the construction side difficult choices, often according to the lowest construction program. Often does not meet the actual needs, and even may lead to settlement of disputes. Another example is provided by electric lighting map and places in the main room illumination standard values should be marked, of course, also require designers to carry out the calculation in accordance with calculation of illumination of lighting configurations. However, the current civil electric lighting design can be marked for illumination illumination standard values and calculations are extremely rare, the vast majority of bay and functions of the rule of thumb according to the Housing cloth lamp. Most of the illumination of a departure from the standard stipulated by the 中原工學(xué)院畢業(yè)設(shè)計（論文）譯文 11 state, affecting the use of functions. For example through the supervision of the trial map electrical construction drawings in a school, after accounting for the design of illuminatio n to achieve the value of laboratory and the c