【正文】 ain extent. According to GB500451995 fire protection design of tall buildings, rule should be used in Fire Equipment dedicated power supply circuit, the power distribution equipment shall be provided with clear signs. Interpretation of the provisions of the power supply circuit means from the lowvoltage main distribution room (including the distribution of electrical room) to last a distribution box, and the general distribution lines should be strictly separated. In this design, the use of methods to increase the level of distribution, that is different from the substation bus segments, respectively, a fire fed a special circuit, set in place two distribution cabis, distribution cabis and then the resulting radial allocated to the end of the dual power to vote each box, so that not only meets the specification requirements for dedicated power supply circuit, but also to avoid feeding the substation level of many small current loop. 5, the choice of circuit breaker and conductor Commercial real estate projects use the room as the uncertainty in the choice of circuit breakers and conductors must be considered in a certain margin to meet the needs caused by adjustment of the load changes. According to this characteristic, increased use in the design of the plug buspowered, not only meet the requirements of large carrying capacity, and also allows the flexibility to increase supply and distribution, are reserved in each shaft in the plugbox backup in order to change, according to changes in upper and lower load, to adjust. For example: a bus is responsible for a shaft 1 to 3 layers of power, when a layer due to the change in capacity increases, while the 3layer capacity is reduced, you can use a spare plug box layer off the 3layer 1 layer capacity rationing . This level distribution in the substation, select the circuit breaker to choose the setting value when the circuit breaker to adjust to changes at the end to adjust the load setting value。 3）需要系數(shù)的選擇：參數(shù)確定后，需要進行負荷計算。需要指出的是由于各層的業(yè)態(tài)比較復雜各層的防火分區(qū)上、下層不對應(yīng)，使得有的豎井在負責本防火分區(qū)供電的同時，還要負責相鄰的防火分區(qū)的供電。根據(jù)以上要求及地上、地下建筑防火分區(qū)和業(yè)態(tài)形式的不同情況，采用了兩種略有差別的方式。按照國際電工委員會（ IEC）及中國國標的要求： ① 所有的配電編號要簡單明了，不能太箱和線路編號不重復。例如：某豎井一段母線負責 1～ 3 層供電，當 1 層由于變化容量增大，而 3 層容量減小時，就可使用 1 層的備用插接箱把 3 層富裕的容量配給 1 層使用。 2 負荷計算 1）負荷特點 :用電負荷大 ,遠大于《全國民用建筑工程設(shè)計術(shù)措施》中大120W/m2 的指標 ,尤其是餐飲的用電負荷更大，而且不同類型、不同飲食文化背景的餐飲差別也很大。 and different levels of economic development between cities is not balanced, power indices are also different。 in the bus and the transformer circuit breaker according to the choice of the general framework of values to select . For example: Route certain equipment capacity 530Kv, Kx take to calculate current of 704A, select the frame circuit breaker is 1000A, tuning is 800A。一般采用需要系數(shù)法，計算過程不再贅述。在設(shè)計時，采用了就近原則，同時也考慮到整條干線負擔的負荷情況，盡量使各個豎井內(nèi)負荷比較平衡。地下部分基本為車庫，用途比較單一，防火分區(qū)也比較整齊，按防火分區(qū)編號，如 AL—BL—1/AP 與 APE 等各字母及數(shù)字含義： AL 代表照明配電箱（ AP 代表動力配電箱，APE 代表應(yīng)急動力配電箱）； BI 代表地下一層； 1/1 代表 I 防火分區(qū) 1 號箱。本工程有 3 個 10Kv 變電所， 20 臺變壓器，上百臺低壓饋出柜，饋出回路更多。根據(jù)這一特點，在設(shè)計中較多地使用了插接母線供電，既可以滿足大載流量的要求，又使供配電靈活性加大，在每層豎井中均預留備用插接箱，以便在變化時 ，可根據(jù)上下層負荷的變化，進行調(diào)整。項目組成為：辦公樓兩座，建筑面積為70800m2， 28 層，標準層高為 。 followed to determine parameter index within the unit area of shops is also very important and plex bec