《民用建筑电气设计规范》JGJ_16-2008讲义--配电线路布线系统[1]
《民用建筑电气设计规范》JGJ 16-2008
《民用建筑电气设计规范》JGJ 16-20084.3 配电变压器选择4.3.1 配电变压器选择应根据建筑物的性质和负荷情况、环境条件确定,并应选用节能型变压器。
4. 3.2 配电变压器的长期工作负载率不宜大于85%。
4.3.3 当符合下列条件之一时,可设专用变压器:1 电力和照明采用共用变压器将严重影响照明质量及光源寿命时,可设照明专用变压器;2 季节性负荷容量较大或冲击性负荷严重影响电能质量时,可设专用变压器;3 单相负荷容量较大,由于不平衡负荷引起中性导体电流超过变压器低压绕组额定电流的25%时,或只有单相负荷其容量不是很大时,可设置单相变压器;4 出于功能需要的某些特殊设备,可设专用变压器;5 在电源系统不接地或经高阻抗接地,电气装置外露可导电部分就地接地的低压系统中(1T系统),照明系统应设专用变压器。
4.3.4 供电系统中,配电变压器宜选用D,ynll接线组别的变压器。
4.3.5 设置在民用建筑中的变压器,应选择干式、气体绝缘或非可燃性液体绝缘的变压器。
当单台变压器油量为100kg及以上时,应设置单独的变压器室。
4.3.6 变压器低压侧电压为0.4kV时,单台变压器容量不宜大于1250kVA。
预装式变电所变压器,单台容量不宜大于800kVA。
4.4 主接线及电器选择4.4.1 配变电所电压为10(6)kV及0.4kV的母线,宜采用单母线或单母线分段接线形式。
4.4.2 配变电所10(6)kV电源进线开关宜采用断路器或带熔断器的负荷开关。
当无继电保护和自动装置要求,且供电容量较小、出线回路数少、无需带负荷操作时,也可采用隔离开关或隔离触头。
4.4.3 配变电所电压为10(6)kV的母线分段处,宜装设与电源进线开关相同型号的断路器,但系统在同时满足下列条件时,可只装设隔离电器:1 事故时手动切换电源能满足要求;2 不需要带负荷操作;3 对母线分段开关无继电保护或自动装置要求。
4.4.4 采用电压为10(6)kV固定式配电装置时,应在电源侧装设隔离电器;在架空出线回路或有反馈可能的电缆出线回路中,尚应在出线侧装设隔离电器。
《民用建筑电气设计规范》JGJ_16-2008讲义--配变电所_4
配变电所的所有门,均应使用防 火门。条文中规定了在各种情况下 对门的防火等级要求,一是为了配 变电所外部火灾时不应对配变电造 成大的影响,另一方面是在配变电 所内部火灾时,尽量限制在本范围 内。
防火门分为甲、乙、丙三级,其 耐火最低极限:甲级应为1.20h;乙 级应为0.90h;丙级应为0.60h。
屏蔽措施:通常在墙体和地坪内
敷设钢网或在变电所的顶棚明敷铁 皮并与接地装置连接。另外,刷屏 蔽涂料(亦称导电漆)也是一种方 法,该涂料主要有银导电漆、银铜 导电漆和镍导电漆。刷屏蔽涂料后, 对射频干扰可降低40~80db。
降噪措施:变压器在楼内安装时, 应采取降噪措施。如在变压器下面 安装减震垫,在变电所内墙上加吸 音板。同时选择低噪音配变电设备 也是非常重要的,干式变压器噪音 现场实测值不超过55dB。
4 配变电所
一 本章内容与原版本相比主要有下 列修改:
1 去工业化色彩,如取消原规范所址 选择中第4.2.1条8款 (不应设在爆炸危 险场所和不宜设在有火灾危险场所的 正上方或正下方,如布置在爆炸危险 场所范围以内和布置在与火灾危险场 所的建筑物毗邻连接时,应符合现行 的<爆炸和火灾危险环境电力装置设 计规范>的规定等等。
5 在总则中,第1.0.3 条规定了, 民 用建筑电气设计应体现以人为本, 对电磁污染、声污染及光污染采取 综合治理,达到环境保护相关标准 的要求,确保人居环境安全。
目前,国内许多建筑物的变电所
与居住房间或办公建筑仅一墙之隔、 一板之隔,从人性化的角度看,变 压器和大电流母排的电磁辐射及噪 声污染对长期生活和工作在里面的 人的身心健康是有影响的。因此, 第 4.9.6条规定: 当配变电所与上、 下或贴邻的居住、办公房间仅有一 层楼板或墙体相隔时,配变电所内 应采取屏蔽、降噪等措施。
《民用建筑电气设计规范》JGJ162008讲义自备应急电源6-PPT精选文档
即,实际功率=额定功率×C% 见表6-2、表6-3 如果外界气压、温度、湿度等条件不同时,应 按照表6-2、6-3、6-4、6-5中所列之校正系数进行 校正。 不同相对湿度和大气压下的(增压)非增压柴油 机功率修正系数C%
3 当有电梯负荷时,在全电压启动最大容量 笼型电动机情况下,发电机母线电压不应低 于额定电压的80%;当无电梯负荷时,其母 线电压不应低于额定电压的75%。当条件允 许时,电动机可采用降压启动方式,柴油发电机容量可 按配电变压器总容量的10%~20%进行估算。在施 工图设计阶段,可根据一级负荷、消防负荷以及 某些重要二级负荷的容量,按下列方法计算的最 大容量确定: 1)按稳定负荷计算发电机容量; 2)按最大的单台电动机或成组电动机启动的 需要,计算发电机容量; 3)按启动电动机时,发电机母线允许电压降 计算发电机容量。
Pk
k
cos 2 容量
SC 2
按最大的单台电动机或成组电动机启动的需要,计算发电机
P P m 1 Pm K C cos m cos
(6-3)
式中 Pm 启动容量最大的电动机或成组电动机 的容量(kW) cos 电动机的启动功率因数,一般取0.4; K 电动机的启动倍数; C 按电动机启动方式确定的系数; 全压启动:C=1.0 Y一△启动C=0.67 自耦变压器启动: 50%抽头C=0.25 65%抽头C=0.42 80%抽头C=0.64 意义同公式(6-2)。
第3款 规定母线电压不得低于80%,包括下述 几方面的因素: 1 保证电动机有足够的启动转矩,因启动转矩 与电源电压的平方成正比; 2 不致因母线电压过低而影响其它用电设备的 正常工作,尤其是对电压比较敏感的负荷; 3 要保证接触器等开关接触设备的吸引线圈能 可靠的工作。 当直接启动大容量的笼型电动机时,发电机母 线的电压降落太大,影响应急电力设备启动或正 常运行时,不应首先考虑加大发电机组的容量, 而应采取其它措施来减少发电机母线的电压波动, 例如采用降压启动方式等。
民用建筑电气设计规范JGJ16-2008
前言根据建设部建标[2002]84号文的要求,规范编制组在广泛调查研究,认真总结实践经验,参考有关国际标准,并广泛征求意见基础上,对《民用建筑电气设计规范》JGJ/T16-92进行了修订。
随着科学技术的发展并结合民用建筑电气设计所涉及的主要技术内容和特点,修订后的本规范在技术内容上做了相应的调整。
取消了室外架空线路、电力设备防雷和声、像节目制作三章,增加了安全技术防范、综合布线、电磁兼容、电子信息设备机房和住宅(小区)电气设计五章,对其他各章所涉及的主要技术内容也进行了补充、完善和必要的修改。
本规范由建设部建筑设计标准技术归口单位中国建筑标准设计研究所归口管理,授权由主编单位负责具体解释。
本规范主编单位:中国建筑东北设计研究院(地址:沈阳市和平区光荣街65号,邮政编码:110003)本规范参编单位:中国建筑标准设计研究所中国建筑设计研究院北京市建筑设计研究院上海现代设计集团天津市建筑设计研究院中国建筑西南设计研究院中国建筑西北设计研究院中南建筑设计研究院哈尔滨工业大学广东省建筑设计研究院福建省建筑设计研究院施耐德电气(中国)投资有限公司ABB(中国)投资有限公司广东伟雄集团浙江湖州久立耐火电缆有限公司本规范主要起草人:主编:王金元副主编:洪元颐、温伯银编委:王可崇、王东林、尹秀伟、孙兰、成彦、刘迪先、李雪佩、李炳华李朝栋、汪猛、杨德才、陈汉民、陈建飚、陈众励、施沪生、张文才目 录1 总则.........................................................................................................................................................10 2 术语.........................................................................................................................................................11 3 供配电系统. (15)3.1 一般规定 (15)3.2 负荷分级及供电要求 (15)3.3 电源及10、35kV 供电系统 (18)3.4 电压选择和电能质量 (20)3.5 负荷计算 (21)3.6 无功补偿...........................................................................................................................................23 4 配变电所. (25)4.1 一般规定...........................................................................................................................................25 4.2 所址选择. (25)4.3 配电变压器选择 (26)4.4 主结线及电器选择...........................................................................................................................27 4.5 配变电所型式和布置.. (29)4.6 10kV 及35kV 配电装置 (31)4.7 低压配电装置...................................................................................................................................34 4.8 电力电容器装置...............................................................................................................................35 4.9 对有关专业的要求...........................................................................................................................36 5 继电保护及电气测量..............................................................................................................................38 5.1 一般规定.........................................................................................................................................38 5.2 继电保护.. (38)5.3 电气测量 (44)5.4 二次回路 (47)5.5 控制方式、所用电源及操作电源.................................................................................................50 6 自备应急电源 (52)6.1 自备应急低压柴油发电机组 (52)6.2 自备应急高压柴油发电机组 (60)6.3 自备燃气轮发电机组 (60)6.4 不间断电源·····································································································································61 w w w .w w w .51z b z .c o7.2 低压配电系统 (63)7.3 特低电压(ELV )配电...................................................................................................................65 7.4 导体选择.. (66)7.5 低压电器的选择 (73)7.6 低压配电线路的保护.....................................................................................................................75 8 配电线路布线系统. (82)8.1 一般规定 (82)8.2 瓷(塑料)线夹、鼓形绝缘子和针式绝缘子布线 (82)8.3 直敷布线 (84)8.4 金属导管布线 (84)8.5 可挠金属电线保护套管布线 (85)8.6 金属线槽布线 (86)8.7 刚性塑料导管(槽)布线.............................................................................................................87 8.8 地面内暗装金属线槽布线. (88)8.9 电力电缆布线 (89)8.10 预制分支电缆布线.......................................................................................................................94 8.11 矿物绝缘(MI )电缆布线.. (94)8.12 电缆桥架(梯架、托盘)布线 (95)8.13 封闭式母线布线...........................................................................................................................97 8.14 电气竖井内布线...........................................................................................................................97 9 常用设备电气装置..................................................................................................................................99 9.1 一般规定.........................................................................................................................................99 9.2 电动机............................................................................................................................................99 9.3 传动运输系统. (105)9.4 电梯、自动扶梯和自动人行道 (107)9.5 自动门和电动卷帘门 (109)9.6 舞台用电设备 (110)9.7 医用放射线设备 (113)9.8 体育馆(场)设备·······················································································································116 10 电气照明··············································································································································118 10.1 一般规定·····································································································································118 10.2 照明质量·····································································································································118 w w w .w w w .51z b z .c o10.5 照度水平.....................................................................................................................................122 10.6 绿色照明与节能.........................................................................................................................124 10.7 照明供电.....................................................................................................................................124 10.8 各类公共建筑照明设计要求.....................................................................................................126 10.9 建筑景观照明.............................................................................................................................132 11 民用建筑物防雷..................................................................................................................................139 11.1 一般规定.....................................................................................................................................139 11.2 建筑物的防雷分类.....................................................................................................................139 11.3 第二类防雷建筑物的防雷措施.................................................................................................140 11.4 第三类防雷建筑物的防雷措施.................................................................................................143 11.5 其他防雷保护措施.....................................................................................................................145 11.6 接闪器.........................................................................................................................................146 11.7 引下线.........................................................................................................................................148 11.8 接地装置.....................................................................................................................................149 11.9 防雷击电磁脉冲.........................................................................................................................150 12 接地及安全..........................................................................................................................................155 12.1 一般规定.....................................................................................................................................155 12.2 低压配电系统的接地型式和基本要求.....................................................................................155 12.3 低压配电系统的防触电保护.....................................................................................................157 12.4 保护接地范围.............................................................................................................................160 12.5 接地要求和接地电阻.................................................................................................................161 12.6 接地装置.....................................................................................................................................163 12.7 通用电力设备及电气设施接地.................................................................................................166 12.8 特殊装置或场所的安全保护.. (172)13 火灾自动报警与联动控制 (182)3.1 一般规定······································································································································182 13.2 系统保护对象分级与保护范围的确定····················································································182 13.3 系统设计····································································································································184 13.4 消防联动控制····························································································································186 13.5 火灾探测器的选择与设置········································································································190 13.6 火灾应急广播····························································································································195 13.7 消防专用电话····························································································································196 w w w .w w w .51z b z .c o13.10 导体选择及敷设......................................................................................................................203 13.11 消防值班室与消防控制室......................................................................................................205 13.12 接地..........................................................................................................................................206 14 安全技术防范......................................................................................................................................207 14.1 一般规定.....................................................................................................................................207 14.2 入侵报警系统.............................................................................................................................208 14.3 视频监控系统.............................................................................................................................211 14.4 出入口控制系统.........................................................................................................................216 14.5 巡更管理系统.............................................................................................................................217 14.6 停车场管理系统.........................................................................................................................217 14.7 管线敷设.....................................................................................................................................218 14.8 系统控制中心(机房).............................................................................................................219 15 有线电视和卫星电视..........................................................................................................................221 15.1 一般规定.....................................................................................................................................221 15.2 有线电视系统设计原则.............................................................................................................221 15.3 接收天线.....................................................................................................................................225 15.4 前端..............................................................................................................................................22 15.5 传输与分配网络.........................................................................................................................227 15.6 卫星电视接收系统、站址的选择.............................................................................................232 15.7 线路敷设.....................................................................................................................................234 15.8 供电、防雷与接地.....................................................................................................................235 16 广播、扩声与会议系统......................................................................................................................237 16.1 一般规定.....................................................................................................................................237 16.2 广播网络. (237)16.3 扩声网络·····································································································································239 16.4 会议系统·····································································································································242 16.5 设备的选择·································································································································243 16.6 设备的布置·································································································································245 16.7 线路敷设·····································································································································247 16.8 控制室········································································································································248 16.9 电源与接地·································································································································249 17 呼应信号及信息显示··························································································································251 w w w .w w w .51z b z .c o17.2 呼应信号的系统组成及设计原则.............................................................................................251 17.3 信息显示装置设计原则.............................................................................................................252 17.4 信息显示装置的控制.................................................................................................................253 17.5 设备选择、线路敷设及机房.....................................................................................................253 17.6 供电、防雷及接地.....................................................................................................................254 17.7 时钟系统.....................................................................................................................................254 18 建筑设备监控系统..............................................................................................................................256 18.1 一般规定.....................................................................................................................................256 18.2 建筑设备监控系统及构成.........................................................................................................256 18.3 建筑设备监控系统的设计.........................................................................................................262 18.4 制冷系统的监控.........................................................................................................................264 18.5 热交换系统的监控.....................................................................................................................266 18.6 新风机组的监控.........................................................................................................................267 18.7 定风量空调机组的监控.............................................................................................................268 18.8 变风量空调机组的监控.............................................................................................................269 18.9 给、排水系统的监控.................................................................................................................270 18.10 室内照明系统的监控...............................................................................................................271 18.11 室外泛光照明及庭院照明的监控...........................................................................................271 18.12 柴油发电机组的监控...............................................................................................................272 18.13 供配电系统的监控...................................................................................................................272 18.14 电梯运行监控...........................................................................................................................273 18.15 管理中心机房设计...................................................................................................................274 19 计算机网络系统..................................................................................................................................277 19.1 一般规定.....................................................................................................................................277 19.2 设计要素. (277)19.3 网络结构与传输介质的选择·····································································································279 19.4 网络连接部件的配置·················································································································280 19.5 系统软件与网络安全·················································································································281 19.6 广域网连接·································································································································282 19.7 办公建筑·····································································································································284 19.8 公共建筑·····································································································································284 19.9 酒店建筑·····································································································································285 19.10 园区网·······································································································································285 w w w .w w w .51z b z .c o。
《民用建筑电气设计规范》08版
前言
根据建设部建标[2002]84 号文的要求,规范编制组在广泛调查研究,认真总结实践经 验,参考有关国际标准,并广泛征求意见基础上,对《民用建筑电气设计规范》JGJ/T16-92 进行了修订。
随着科学技术的发展并结合民用建筑电气设计所涉及的主要技术内容和特点,修订后的 本规范在技术内容上做了相应的调整。取消了室外架空线路、电力设备防雷和声、像节目制 作三章,增加了安全技术防范、综合布线、电磁兼容、电子信息设备机房和住宅(小区)电 气设计五章,对其他各章所涉及的主要技术内容也进行了补充、完善和必要的修改。
m 4 配变电所 ·················································································································································25 o 4.1 一般规定···········································································································································25 .c 4.2 所址选择···········································································································································25 z 4.3 配电变压器选择·······························································································································26 H 4.4 主结线及电器选择···························································································································27 50 4.5 配变电所型式和布置·······················································································································29 n 4.6 10kV 及 35kV 配电装置····················································································································31 .c 4.7 低压配电装置···································································································································34 w 4.8 电力电容器装置·······························································································································35 ww 4.9 对有关专业的要求···························································································································36
《民用建筑电气设计规范》JGJ_16-2008讲义--自备应急电源6资料教程
2)当两台机组并列运行时,机组的中性点应 经刀开关接地。当两台机组的中性导体存在环流 时,应只将其中一台发电机的中性点接地; 3)当两台机组并列运行时,两台机组的中性 点可经限流电抗器接地。 2 发电机中性导体上的接地刀开关,可根据发 电机允许的不对称负荷电流及中性导体上可能出 现的零序电流选择; 3 采用电抗器限制中性导体环流时,电抗器的 额定电流可按发电机额定电流的25%选择,阻抗 值可按通过额定电流时其端电压小于10V选择。
这种类型机组能适应各种运行方式,易于实现 机组自动化或对发电机组的遥控。 目前国产柴油发电机组启动时间可以小于15s, 有的厂产品可在4~7s,保证值为15s。
6.1.8 发电机组的自启动应符合下列规定: 1 机组应处于常备启动状态。一类高层建筑 及火灾自动报警系统保护对象分级为一级建筑物 的发电机组,应设有自动启动装置,当市电中断 时,机组应立即启动,并应在30s内供电; 当采用自动启动有困难时,二类高层建筑及二 级保护对象建筑物的发电机组,可采用手动启动 装置; 机组应与市电联锁,不得与其并列运行。当市 电恢复时,机组应自动退出工作,并延时停机;
பைடு நூலகம்
【注释】 机组的选择 第1款 确定机组容量时,除考虑应急负荷总容 量之外,应着重考虑启动电动机容量。因单台电 动机最大启动容量对确定机组容量有直接关系。 另外机组能启动电动机容量大小的因素又很多, 它与发电机的技术性能、柴油机的调速性能和启 动时发电机所带负荷大小和功率因数的高低、发 电机的励磁和调压方式以及用电负荷对电压指标 的要求等因素有关。因此,设计确定机组容量, 应具体分析区别对待。 为了便于设计参考,对三相低压柴油发电机组 在空载时,能全电压直接启动的空载四极笼型三 相异步电动机最大容量可参见表6-1。
民用建筑电气设计规范JGJ16-2008布线要求
民用建筑电气设计规范JGJ16-2008布线要
求
根据民用建筑电气设计规范JGJ16-2008,刚性塑料导管也就是PVC线管的布线要求如下:PVC线管适用于室内和有腐蚀性劣质的场所,不适用于高温个容易受机械损伤的场所,也就是适用于家装;暗埋在墙里或者是混凝土里的刚性塑料导管应选用中型导管;三根及以上绝缘电线穿于同一根导管时,其总的截面积不应超过导管内截面积的40%;不同回路得线路不应穿于同一根刚性塑料导管内;电线在塑料导管内不得有接头,分支接头应在分线盒内进行;刚性塑料导管暗敷或者是埋地敷设时,引出地面的高度不应低于300mm,有防止损伤的措施;刚性塑料导管当管路较长或者是转弯较多时,宜适当增加拉线盒或加大管径;对无弯的管路不超过30米;两个拉线点之间有一个弯时,不超过20米;两个拉线点之间有两个弯时,不超过15米;两个拉线点之间有三个弯时,不超过8米;刚性塑料导管在穿过建筑物变形缝时,应装设补偿装置;塑料线导管布线,在线路连接、转角、分支及终端处应采用相应的附件。
建筑电气, 电气设计。
JGJ/T16-2008民用建筑电气设计规范
4
配变电所 ·················································································································································25 4.1 一般规定···········································································································································25 4.2 所址选择···········································································································································25 4.3 配电变压器选择·······························································································································26 4.4 主结线及电器选择···························································································································27 4.5 配变电所型式和布置·······················································································································29 4.6 10kV 及 35kV 配电装置····················································································································31 4.7 低压配电装置···································································································································34 4.8 电力电容器装置·······························································································································35 4.9 对有关专业的要求···························································································································36
《民用建筑电气设计规范》JGJ16-2008强制条文汇编-最新年精选文档
中华人民共和国建设部公告第800号建设部关于发布行业标准《民用建筑电气设计规范》的公告现批准《民用建筑电气设计规范》为行业标准,编号为JGJ16-2019,自2008年8月1日起实施。
其中,第3.2.8、3.3.2、4.3.5、4.7.3、4.9.1、4.9.2、7.4.2、7.4.6、7.5.2、7.6.2、7.6.4、7.7.5、11.1.7、11.2.3、11.2.4、11.6.1、11.8.9、11.9.5、12.2.3、12.2.6、12.3.4、12.5.2、12.5.4、12.6.2、14.9.4条为强制性条文,必须严格执行。
原行业标准《民用建筑电气设计规范》JGJ/T 16-92同时废止。
本规范由建设部标准定额研究所组织中国建筑工业出版社出版发行中华人民共和国建设部2008年1月31日(注:部分强制性条文有条文说明可用Ctrl+点击互相翻查)3 供配电系统3.2负荷分级及供电要求3.2.8条:一级负荷应由两个电源供电,当一个电源发生故障时,另一个电源不应同时受到损坏。
(第十页)3.3电源及供配电系统3.3.2条:应急电源与正常电源之间必须采取防止并列运行的措施。
(第11页)4 配变电所4.3配电变压器选择4.3.5条:设置在民用建筑中的变压器,应选择干式、气体绝缘或非可燃性液体绝缘的变压器。
当单台变压器油量为100kg及以上时,应设置单独的变压器室。
(第17-18页)4.7低压配电装置4.7.3条:当成排布置的配电屏长度大于6m时,屏后面的通道应设有两个出口。
当出口之间的距离大于15m时,应增加出口。
(第24页)4.9 对土建专业的要求4.9.1条:可燃油油浸电力变压器的耐火等级应为一级。
非燃或难燃介质的电力变压器室、电压为10(6)kV的配电装置室和电容器室的耐火等级不应低于二级。
低压配电装置室和电容器室的耐火等级不应低于三级。
(第25页)4.9.2条:配变电所的门应为防火门,并应负荷下列规定:1 配变电所位于高层主体建筑(或裙房)内时,通向其他相邻房间的门应为甲级防火门,通向过道的门应为乙级防火门;2 配变电所位于多层建筑物的二层或更高层时,通向其他相邻房间的门应为甲级防火门,通向过道的门应为乙级防火门;3 变配电所位于多层建筑的一层时,通向相邻房间或过道的门应为乙级防火门;4 变配电所位于地下一层或下面有地下层时,通向相邻房间或过道的门应为甲级防火门;5 变配电所附近堆有易燃物品或通向汽车库的门应为甲级防火门;6 变配电所直接通向室外的门应为丙级防火门。
民用建筑电气设计规范JGJ16-2008
前言根据建设部建标[2002]84号文的要求,规范编制组在广泛调查研究,认真总结实践经验,参考有关国际标准,并广泛征求意见基础上,对《民用建筑电气设计规范》JGJ/T16-92进行了修订。
随着科学技术的发展并结合民用建筑电气设计所涉及的主要技术内容和特点,修订后的本规范在技术内容上做了相应的调整。
取消了室外架空线路、电力设备防雷和声、像节目制作三章,增加了安全技术防范、综合布线、电磁兼容、电子信息设备机房和住宅(小区)电气设计五章,对其他各章所涉及的主要技术内容也进行了补充、完善和必要的修改。
本规范由建设部建筑设计标准技术归口单位中国建筑标准设计研究所归口管理,授权由主编单位负责具体解释。
本规范主编单位:中国建筑东北设计研究院(地址:沈阳市和平区光荣街65号,邮政编码:110003)本规范参编单位:中国建筑标准设计研究所中国建筑设计研究院北京市建筑设计研究院上海现代设计集团天津市建筑设计研究院中国建筑西南设计研究院中国建筑西北设计研究院中南建筑设计研究院哈尔滨工业大学广东省建筑设计研究院福建省建筑设计研究院施耐德电气(中国)投资有限公司ABB(中国)投资有限公司广东伟雄集团浙江湖州久立耐火电缆有限公司本规范主要起草人:主编:王金元副主编:洪元颐、温伯银编委:王可崇、王东林、尹秀伟、孙兰、成彦、刘迪先、李雪佩、李炳华李朝栋、汪猛、杨德才、陈汉民、陈建飚、陈众励、施沪生、张文才目 录1 总则.........................................................................................................................................................10 2 术语.........................................................................................................................................................11 3 供配电系统. (15)3.1 一般规定 (15)3.2 负荷分级及供电要求 (15)3.3 电源及10、35kV 供电系统 (18)3.4 电压选择和电能质量 (20)3.5 负荷计算 (21)3.6 无功补偿...........................................................................................................................................23 4 配变电所. (25)4.1 一般规定...........................................................................................................................................25 4.2 所址选择. (25)4.3 配电变压器选择 (26)4.4 主结线及电器选择...........................................................................................................................27 4.5 配变电所型式和布置.. (29)4.6 10kV 及35kV 配电装置 (31)4.7 低压配电装置...................................................................................................................................34 4.8 电力电容器装置...............................................................................................................................35 4.9 对有关专业的要求...........................................................................................................................36 5 继电保护及电气测量..............................................................................................................................38 5.1 一般规定.........................................................................................................................................38 5.2 继电保护.. (38)5.3 电气测量 (44)5.4 二次回路 (47)5.5 控制方式、所用电源及操作电源.................................................................................................50 6 自备应急电源 (52)6.1 自备应急低压柴油发电机组 (52)6.2 自备应急高压柴油发电机组 (60)6.3 自备燃气轮发电机组 (60)6.4 不间断电源·····································································································································61 w w w .w w w .51z b z .c o7.2 低压配电系统 (63)7.3 特低电压(ELV )配电...................................................................................................................65 7.4 导体选择.. (66)7.5 低压电器的选择 (73)7.6 低压配电线路的保护.....................................................................................................................75 8 配电线路布线系统. (82)8.1 一般规定 (82)8.2 瓷(塑料)线夹、鼓形绝缘子和针式绝缘子布线 (82)8.3 直敷布线 (84)8.4 金属导管布线 (84)8.5 可挠金属电线保护套管布线 (85)8.6 金属线槽布线 (86)8.7 刚性塑料导管(槽)布线.............................................................................................................87 8.8 地面内暗装金属线槽布线. (88)8.9 电力电缆布线 (89)8.10 预制分支电缆布线.......................................................................................................................94 8.11 矿物绝缘(MI )电缆布线.. (94)8.12 电缆桥架(梯架、托盘)布线 (95)8.13 封闭式母线布线...........................................................................................................................97 8.14 电气竖井内布线...........................................................................................................................97 9 常用设备电气装置..................................................................................................................................99 9.1 一般规定.........................................................................................................................................99 9.2 电动机............................................................................................................................................99 9.3 传动运输系统. (105)9.4 电梯、自动扶梯和自动人行道 (107)9.5 自动门和电动卷帘门 (109)9.6 舞台用电设备 (110)9.7 医用放射线设备 (113)9.8 体育馆(场)设备·······················································································································116 10 电气照明··············································································································································118 10.1 一般规定·····································································································································118 10.2 照明质量·····································································································································118 w w w .w w w .51z b z .c o10.5 照度水平.....................................................................................................................................122 10.6 绿色照明与节能.........................................................................................................................124 10.7 照明供电.....................................................................................................................................124 10.8 各类公共建筑照明设计要求.....................................................................................................126 10.9 建筑景观照明.............................................................................................................................132 11 民用建筑物防雷..................................................................................................................................139 11.1 一般规定.....................................................................................................................................139 11.2 建筑物的防雷分类.....................................................................................................................139 11.3 第二类防雷建筑物的防雷措施.................................................................................................140 11.4 第三类防雷建筑物的防雷措施.................................................................................................143 11.5 其他防雷保护措施.....................................................................................................................145 11.6 接闪器.........................................................................................................................................146 11.7 引下线.........................................................................................................................................148 11.8 接地装置.....................................................................................................................................149 11.9 防雷击电磁脉冲.........................................................................................................................150 12 接地及安全..........................................................................................................................................155 12.1 一般规定.....................................................................................................................................155 12.2 低压配电系统的接地型式和基本要求.....................................................................................155 12.3 低压配电系统的防触电保护.....................................................................................................157 12.4 保护接地范围.............................................................................................................................160 12.5 接地要求和接地电阻.................................................................................................................161 12.6 接地装置.....................................................................................................................................163 12.7 通用电力设备及电气设施接地.................................................................................................166 12.8 特殊装置或场所的安全保护.. (172)13 火灾自动报警与联动控制 (182)3.1 一般规定······································································································································182 13.2 系统保护对象分级与保护范围的确定····················································································182 13.3 系统设计····································································································································184 13.4 消防联动控制····························································································································186 13.5 火灾探测器的选择与设置········································································································190 13.6 火灾应急广播····························································································································195 13.7 消防专用电话····························································································································196 w w w .w w w .51z b z .c o13.10 导体选择及敷设......................................................................................................................203 13.11 消防值班室与消防控制室......................................................................................................205 13.12 接地..........................................................................................................................................206 14 安全技术防范......................................................................................................................................207 14.1 一般规定.....................................................................................................................................207 14.2 入侵报警系统.............................................................................................................................208 14.3 视频监控系统.............................................................................................................................211 14.4 出入口控制系统.........................................................................................................................216 14.5 巡更管理系统.............................................................................................................................217 14.6 停车场管理系统.........................................................................................................................217 14.7 管线敷设.....................................................................................................................................218 14.8 系统控制中心(机房).............................................................................................................219 15 有线电视和卫星电视..........................................................................................................................221 15.1 一般规定.....................................................................................................................................221 15.2 有线电视系统设计原则.............................................................................................................221 15.3 接收天线.....................................................................................................................................225 15.4 前端..............................................................................................................................................22 15.5 传输与分配网络.........................................................................................................................227 15.6 卫星电视接收系统、站址的选择.............................................................................................232 15.7 线路敷设.....................................................................................................................................234 15.8 供电、防雷与接地.....................................................................................................................235 16 广播、扩声与会议系统......................................................................................................................237 16.1 一般规定.....................................................................................................................................237 16.2 广播网络. (237)16.3 扩声网络·····································································································································239 16.4 会议系统·····································································································································242 16.5 设备的选择·································································································································243 16.6 设备的布置·································································································································245 16.7 线路敷设·····································································································································247 16.8 控制室········································································································································248 16.9 电源与接地·································································································································249 17 呼应信号及信息显示··························································································································251 w w w .w w w .51z b z .c o17.2 呼应信号的系统组成及设计原则.............................................................................................251 17.3 信息显示装置设计原则.............................................................................................................252 17.4 信息显示装置的控制.................................................................................................................253 17.5 设备选择、线路敷设及机房.....................................................................................................253 17.6 供电、防雷及接地.....................................................................................................................254 17.7 时钟系统.....................................................................................................................................254 18 建筑设备监控系统..............................................................................................................................256 18.1 一般规定.....................................................................................................................................256 18.2 建筑设备监控系统及构成.........................................................................................................256 18.3 建筑设备监控系统的设计.........................................................................................................262 18.4 制冷系统的监控.........................................................................................................................264 18.5 热交换系统的监控.....................................................................................................................266 18.6 新风机组的监控.........................................................................................................................267 18.7 定风量空调机组的监控.............................................................................................................268 18.8 变风量空调机组的监控.............................................................................................................269 18.9 给、排水系统的监控.................................................................................................................270 18.10 室内照明系统的监控...............................................................................................................271 18.11 室外泛光照明及庭院照明的监控...........................................................................................271 18.12 柴油发电机组的监控...............................................................................................................272 18.13 供配电系统的监控...................................................................................................................272 18.14 电梯运行监控...........................................................................................................................273 18.15 管理中心机房设计...................................................................................................................274 19 计算机网络系统..................................................................................................................................277 19.1 一般规定.....................................................................................................................................277 19.2 设计要素. (277)19.3 网络结构与传输介质的选择·····································································································279 19.4 网络连接部件的配置·················································································································280 19.5 系统软件与网络安全·················································································································281 19.6 广域网连接·································································································································282 19.7 办公建筑·····································································································································284 19.8 公共建筑·····································································································································284 19.9 酒店建筑·····································································································································285 19.10 园区网·······································································································································285 w w w .w w w .51z b z .c o。
《民用建筑电气设计规范》JGJ_16-2008讲义--配电线路布线系统[1]资料
3 设计应根据对线路的阻燃、低卤或耐火等功 能要求,选用相适应的阻燃、低卤或耐火型电缆; 4 选择主干电缆截面和分支电缆截面应留有约 30%的裕量,并满足电压降的要求; 推荐选用单芯预制分支电缆,基于以下几点: 1 ) 单芯电缆载流量大,相同截面的同型预制 分支电缆,在空气中明敷设时,单芯电缆的载流 量是多芯电缆的1.4倍; 2 ) 单芯电缆的主电缆截面大,可达1000mm2, 作为干线电缆可有充足的裕量选择; 3 ) 多芯电缆的分支接头需特殊制作,制造工 艺复杂。因此,在价格及可靠性上不及单芯电缆。
【注释】 电缆弯成“S”或“Ω”形弯是对电 缆线路经过建筑物变形缝或引入振动源设 备所引起的电缆线路的变形补偿。 8.9.8 除支架敷设在支架处固定外,电缆敷 设时,其固定点之间的距离不应大于表8.9.8 的规定。 表8.9.8 矿物绝缘(MI)电缆固定点或支 架间的最大距离
例1:计算电流为800A、长度为50m的配电线路, 按最高使用温度不超过70℃要求,根据制造厂提 供的载流表可选用300mm2单芯矿物绝缘电缆,其 成品电缆交货长度仅为42m,为避免电缆中间接头, 宜选用185mm2电缆双拼,成品电缆交货长度为 70m。
例2:根据计算电流要选用4×25mm2的多芯矿 物绝缘电缆,当线路长度超过成品电缆的交货长 度80m时,可考虑选用4根25mm2的单芯电缆,其 成品交货长度可达260m。避免中间接头。
【注释】 单芯预制分支电缆,特别是大截面、大 电流电缆在通电运行时,其周围产生强烈的交变磁 场,为防止产生的涡流效应给布线系统造成的不良 影响,对电缆的支承桥架、支架、卡具等应选用专 用附件,严禁使用导磁材料。
8.8.6 预制分支电缆布线,应防止在电缆敷设和使 用过程中,因电缆自重和敷设过程中的附加外力 等机械应力作用而带来的损害。
jgj16-《民用建筑电气设计规范》
For personal use only in study and research; not for commercialuse《民用建筑电气设计规范》JGJ16-20083 供配电系统负荷分级及供电要求条:一级负荷应由两个电源供电,当一个电源发生故障时,另一个电源不应同时受到损坏。
(第十页)电源及供配电系统条:应急电源与正常电源之间必须采取防止并列运行的措施。
(第11页)4 配变电所配电变压器选择条:设置在民用建筑中的变压器,应选择干式、气体绝缘或非可燃性液体绝缘的(第17-18变压器。
当单台变压器油量为100kg及以上时,应设置单独的变压器室。
页)低压配电装置条:当成排布置的配电屏长度大于6m时,屏后面的通道应设有两个出口。
当出口之间的距离大于15m时,应增加出口。
(第24页)对土建专业的要求条:可燃油油浸电力变压器的耐火等级应为一级。
非燃或难燃介质的电力变压器室、电压为10(6)kV的配电装置室和电容器室的耐火等级不应低于二级。
低压配电装置室和电容器室的耐火等级不应低于三级。
(第25页)条:配变电所的门应为防火门,并应负荷下列规定:1 变配电所位于高层主体建筑(或裙房)内时,通向其他相邻房间的门应为甲级防火门,通向过道的门应为乙级防火门;2 变配电所位于多层建筑物的二层或更高层时,通向其他相邻房间的门应为甲级防火门,通向过道的门应为乙级防火门;3 变配电所位于多层建筑的一层时,通向相邻房间或过道的门应为乙级防火门;4 变配电所位于地下一层或下面有地下层时,通向相邻房间或过道的门应为甲级防火门;5 变配电所附近堆有易燃物品或通向汽车库的门应为甲级防火门;6 变配电所直接通向室外的门应为丙级防火门。
(第25页)7 低压配电导体选择条:低压配电导体截面的选择应符合下列要求:1)按敷设方式、环境条件确定的导体截面,其导体载流量不应小于预期负荷的最大计算电流和按保护条件所确定的电流;2)线路电压损失不应超过允许值;3)导体最小截面应满足机械强度的要求,配电线路每一相导体截面不应小于表的规定。
jgj162008民用建筑电气设计规范.doc
jgj162008民用建筑电气设计规范《jgj162008民用建筑电气设计规范》本规范由建设部标准定额研究所组织中国建筑工业出版社出版发行。
以下是中国下面整理相关jgj16-2008民用建筑电气设计规范内容:《jgj162008民用建筑电气设计规范》基本简介:《jgj162008民用建筑电气设计规范》本规范的主要技术内容是:1.总则;2.术语、代号;3.供配电系统;4.配变电所;5.继电保护及电气测量;6.自备应急电源;7.低压配电;8.配电线路布线系统;9.常用设备电气装置;10.电气照明;11.民用建筑物防雷;12.接地和特殊场所的安全防护;13.火灾自动报警系统;14.安全技术防范系统;15.有线电视和卫星电视接收系统;16.广播、扩声与会议系统;17.呼应信号及信息显示;18.建筑设备监控系统;19.计算机网络系统;20.通信网络系统;21.综合布线系统;22.电磁兼容与电磁环境卫生;23.电子信息设备机房;24.锅炉房热工检测与控制。
其中民用建筑电气规范中总则的基本内容如下:其中继电保护及电气测量的基本内容如下:5继电保护及电气测量5.1一般规定5.1.1本章适用于民用建筑中10(6)kV电力设备和线路的继电保护及电气测量。
5.1.2继电保护装置应满足可靠性、选择性、灵敏性和速动性的要求。
5.1.3重要的配变电所可根据需求采用智能化保护装置或变电所综合自动化系统。
5.1.4继电保护及电气测量的设计除符合本规范外,尚应符合现行国家标准《电力装置的继电保护和自动装置设计规范》GB50062和《电力装置的电气测量仪表装置设计规范》GB50063的有关规定。
5.2继电保护5.2.1继电保护设计应符合下列规定:1电力设备和线路应装设短路故障和异常运行保护装置。
电力设备和线路短路故障的保护应有主保护和后备保护,必要时可增设辅助保护。
2继电保护装置的接线应简单可靠,并应具有必要的检测、闭锁等措施。
保护装置应便于整定、调试和运行维护。
JGJ16-2008《民用建筑电气设计规范》
《民用建筑电气设计规范》JGJ16-20083供配电系统3.2 负荷分级及供电要求3.2.8 条:一级负荷应由两个电源供电,当一个电源发生故障时,另一个电源不应同时受到损坏。
(第十页)3.3 电源及供配电系统3.3.2 条:应急电源与正常电源之间必须采取防止并列运行的措施。
(第 11 页)4 配变电所4.3 配电变压器选择4.3.5 条:设置在民用建筑中的变压器,应选择干式、气体绝缘或非可燃性液体绝缘的变压器。
当单台变压器油量为 100kg 及以上时,应设置单独的变压器室。
(第 17-18 页)4.7 低压配电装置4.7.3 条:当成排布置的配电屏长度大于 6m时,屏后面的通道应设有两个出口。
当出口之间的距离大于 15m时,应增加出口。
(第 24 页)4.9 对土建专业的要求4.9.1 条:可燃油油浸电力变压器的耐火等级应为一级。
非燃或难燃介质的电力变压器室、电压为 10( 6)kV 的配电装置室和电容器室的耐火等级不应低于二级。
低压配电装置室和电容器室的耐火等级不应低于三级。
(第 25 页)4.9.2 条:配变电所的门应为防火门,并应负荷下列规定:1变配电所位于高层主体建筑(或裙房)内时,通向其他相邻房间的门应为甲级防火门,通向过道的门应为乙级防火门;2变配电所位于多层建筑物的二层或更高层时,通向其他相邻房间的门应为甲级防火门,通向过道的门应为乙级防火门;3变配电所位于多层建筑的一层时,通向相邻房间或过道的门应为乙级防火门;4变配电所位于地下一层或下面有地下层时,通向相邻房间或过道的门应为甲级防火门;5变配电所附近堆有易燃物品或通向汽车库的门应为甲级防火门;6变配电所直接通向室外的门应为丙级防火门。
(第 25 页)7低压配电7.4 导体选择7.4.2 条:低压配电导体截面的选择应符合下列要求:1)按敷设方式、环境条件确定的导体截面,其导体载流量不应小于预期负荷的最大计算电流和按保护条件所确定的电流;2)线路电压损失不应超过允许值;3)导体最小截面应满足机械强度的要求,配电线路每一相导体截面不应小于表 7.4.2 的规定。
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在确定合适的线芯最高使用温度后,根据不同使 用温度下的电缆允许载流量,合理选择相应的电 缆规格。 8.9.5 应根据线路实际长度及电缆交货长度,合理 确定矿物绝缘电缆规格,宜避免中间接头。 【注释】 矿物绝缘电缆中间接头是线路运行耐 火性能的薄弱环节,应设法避免。由于受原材料 的限制,矿物绝缘电缆,特别是大截面单芯电缆 其成品交货长度都较短。为避免中间接头,应根 据制造厂规定的电缆成品交货长度、敷设线路长 度合理选择电缆规格。 当根据线路计算电流、线芯最高使用温度给定 的电缆载流量确定的电缆,其交货长度小于线路 敷设长度时,可采用小截面电缆双拼联接或将多 芯电缆改选为多根单芯电缆。
8.8.2 预制分支电缆应根据使用场所的环境特征及 功能要求,选用具有聚氯乙烯绝缘聚氯乙烯护套、 交联聚乙烯绝缘聚氯乙烯护套或聚烯烃护套的普 通、阻燃或耐火型的单芯或多芯预制分支电缆。 在敷设环境和安装条件允许时,宜选用单芯预 制分支电缆。 【注释】 预制分支电缆应根据使用场所的环境 条件(温、湿度及腐蚀性等)及使用功能要求 (阻燃、耐火等)进行选型。 1 一般场所或一般负荷,选用VV型聚氯乙烯绝 缘聚氯乙烯护套预制分支电缆; 2 使用环境平均温度大于35℃或负荷较大时, 选用YJV型交联聚乙烯绝缘聚氯乙烯护套预制分支 电缆;
8.8.4 预制分支电缆布线,除符合本节规定外,尚 应根据预制分支电缆布线所采取的不同敷设方法, 分别符合本规范第8.7.1条~第8.7.5条中相应敷设方 法的相关规定。 8.8.5 当预制分支电缆的主干电缆采用单芯电缆用 在交流电路时,电缆的固定用夹具应选用专用附件。 严禁使用封闭导磁金属夹具。
【注释】 单芯预制分支电缆,特别是大截面、大 电流电缆在通电运行时,其周围产生强烈的交变磁 场,为防止产生的涡流效应给布线系统造成的不良 影响,对电缆的支承桥架、支架、卡具等应选用专 用附件,严禁使用导磁材料。
8.8.6 预制分支电缆布线,应防止在电缆敷设和使 用过程中,因电缆自重和敷设过程中的附加外力 等机械应力作用而带来的损害。
8.4.8 可挠金属电线保护套管布线,其套管的金属 外壳应可靠接地。 【注释】 条文规定是为了保证运行安全,可挠 金属电线保护套管与管、盒(箱)必须与保护导 体(PE)可靠连接。连接应采用可挠金属电线保 护套管专用接地夹,跨线为截面不少于4mm2的多 股软铜线。当可挠金属电缆保护套管与盒(箱) 连接时,无电气连接部分的两端应跨接接地导体。 不得利用套管的金属外壳作接地导体。
8.8.3 预制分支电缆布线,宜在室内及电气竖井内 沿建筑物表面以支架或电缆桥架(梯架)等构件明 敷设。预制分支电缆垂直敷设时,应根据主干电缆 最大直径预留穿越楼板的洞口,同时尚应在主干电 缆最顶端的楼板上预留吊钩。 【注释】 预制分支电缆垂直敷设,一般采用吊装 方式。卷扬机视具体条件可放在顶层或底层,电缆 末端固定用吊具及提升金具的强度应为所吊电缆总 重量的4倍。电缆在吊装悬挂后应立即固定,固定 点间距宜为1.5~2m。
8.8.1 预制分支电缆布线宜用于高层、多层及大型 公共建筑物室内低压树干式配电系统。
【注释】 预制分支电缆是在上世纪80年代末期, 由国外引进技术而生产的一种新型电缆。是在聚 氯乙烯绝缘及护套、交联聚乙烯绝缘聚氯乙烯护 套或交联聚乙烯绝缘聚烯烃护套的非阻燃、阻燃、 低烟低卤、耐火型或无烟无卤型等单芯或多芯电 力电缆上,按用户要求的规格和分支距离由制造 厂采用全过程机械化制作分支接头。因其具有载 流量大;耐酸、碱腐蚀能力强;气密性、防水性 能好;安装方便、快捷;故障率低、运行可靠等 优点,已被广泛应用在高层、多层及大型公共建 筑物中,作为室内低压树干式配电系统主干线及 分支电缆。
【注释】 暗配管要有一定的埋设深度。覆层太浅不便于 与盒箱连接,还会使表面产生裂缝或脱落影响工程质量。 在某些潮湿场所埋设太浅时,还会出现因导管锈蚀在墙面 上出现印痕影响美观或损坏导管。
8.4.7 在可挠金属电线保护套管有可能受重物压力 或明显机械冲击的部位,应采取保护措施。 【注释】 虽然可挠金属电线保护套管具有国家 标准《电气安装用导管系统第1部分:通用要求》 按耐压力分类的重型导管的性能,但为了保证布 设及运行安全,要求在布设及运行过程中在有受 重压或明显机械冲击的部位采取必要的保护措施。 在布设过程中,尤应注意此问题。
【注释】 矿物绝缘电缆,在不同的线芯最高使 用温度下,相同截面的电缆可具有不同的载流量。 使用温度愈高,载流量愈大。因此,在选择电缆 载流量进而确定电缆规格时,应根据环境温度、 性质、电缆用途合理确定线芯最高使用温度。 常规线路:按最高使用温度不超过70℃,适用 于电缆沿墙、支架、梯架上明敷设;线路与其它 塑料电缆共同敷设同一桥架、竖井、电缆沟、电 缆隧道及如果电缆护套温度过高,易引起人员伤 害或设备损坏的场合。 经济线路:按最高使用温度105℃,适用于单 独敷设在电缆桥架、电缆沟、穿管等人员无法触 及的场合。 特殊线路:按最高使用温度为150~250℃之间, 适用于埋地敷设且线路两端的联接不影响设备运 行的线路及长期环境温度高于70℃的场所。
矿物绝缘(MI)电缆的长期使用温度可达250℃, 在950~1000℃下可维持3小时不损坏。铜护套在 1083℃下熔融,而氧化镁绝缘材料的熔点为2800℃。 8.9.2 矿物绝缘电缆应根据使用要求和敷设条件, 选择电缆沿电缆桥架敷设、电缆在电缆沟或隧道内 敷设、电缆沿支架敷设或电缆穿导管敷设等敷设方 式。 8.9.3 下列情况应采用带塑料护套的矿物绝缘电缆: 1 电缆明敷在有美观要求的场所; 2 穿金属导管敷设的多芯电缆; 3 对铜有强腐蚀作用的化学环境;
8 配电线路布线系统 一 本章内容与原版本相比主要有下列修改: 1 删除了原规范中第9.2节 瓷(塑料)线夹、 鼓形绝缘子 、针式绝缘子布线;第9.9节地面内 暗装金属线槽布线等内容。 2 增加了第8.4节 可挠金属电线保护套管布 线、第8.8节 预制分支电缆布线和第8.9节 矿物 绝缘(MI)电缆布线等内容。
8.4.3 对于可挠金属电线保护套管布线,其管内配 线应符合本规范第8.3.3~8.3.5条的规定。 【注释】 为满足布线施工及运行的安全,特制 定本条文,详见第8.3.3~8.3.5条的注释。 8.4.4 对于可挠金属电线保护套管布线,其管路与 热水管、蒸汽管或其他管路的敷设要求与平行、交 叉距离,应符合本规范第8.3.6条的规定。 【注释】 参见第8.3.6条注释。 8.4.5 当可挠金属电线保护套管布线的线路较长或 转弯较多时,应符合本规范第8.3.7条的规定。 【注释】 为确保安全及便于穿线,详见第8.3.7 条注释。 8.4.6 对于暗敷于建筑物、构筑物内的可挠金属电 线保护套管其与建筑物、构筑物表面的外护层厚度 不应小于15mm。
8.9.6 电缆敷设时,电缆的最小允许弯曲半 径不应小于表8.9.6的规定。
【注释】 为保证矿物绝缘电缆的绝缘和护套不因 敷设时弯度过小而遭受损坏,电缆在弯曲时,要保 持足够的弯曲半径。对一些大截面单芯电缆的弯曲 半径制造厂又规定,截面为300mm2及以上的单芯 矿物绝缘电缆,最小弯曲半径要求为电缆外径的12 倍。 当遇有截面不同的电缆相同走向时,应按最大截 面电缆的弯曲半径进行弯曲,以达到美观整齐要求。 8.9.7 电缆在下列场所敷设时,应将电缆敷设成“S” 或“Ω”形弯,其弯曲半径不应小于电缆外径的6倍: 1 在温度变化大的场所; 2 有振动源设备的布线; 3 建筑物变形缝。
3 设计应根据对线路的阻燃、低卤或耐火等功 能要求,选用相适应的阻燃、低卤或耐火型电缆; 4 选择主干电缆截面和分支电缆截面应留有约 30%的裕量,并满足电压降的要求; 推荐选用单芯预制分支电缆,基于以下几点: 1 ) 单芯电缆载流量大,相同截面的同型预制 分支电缆,在空气中明敷设时,单芯电缆的载流 量是多芯电缆的1.4倍; 2 ) 单芯电缆的主电缆截面大,可达1000mm2, 作为干线电缆可有充足的裕量选择; 3 ) 多芯电缆的分支接头需特殊制作,制造工 艺复杂。因此,在价格及可靠性上不及单芯电缆。 Nhomakorabea
8.4.9 暗敷于地下的可挠金属电线保护套管的管路 不应穿过设备基础。当穿过建筑物基础时,应加 保护管保护;当穿过建筑物变形缝时,应设补偿 装置。 【注释】 参见第8.3.8条注释。 8.4.10 可挠金属电线保护套管之间及其与盒、箱 或钢导管连接时,应采用专用附件。 【注释】 为保证可挠金属电线保护套管布线质 量和运行安全,可挠金属电线保护套管之间及与 盒、箱或钢制电线保护导管的连接,必须采用符 合标准的专用附件。专用附件主要包括各种类型 的连接器、绝缘护套、固定夹子及接地夹等。
8.4.2 明敷或暗敷于建筑物顶棚内正常环境的室内 场所时,可采用双层金属层的基本型可挠金属电线 保护套管。明敷于潮湿场所或暗敷于墙体、混凝土 地面、楼板垫层或现浇钢筋混凝土楼板内,或直埋 地下时,应采用双层金属层外覆聚氯乙烯护层的防 水型可挠金属电线保护套管。 【注释】 民用建筑布线系统所采用的可挠金属 电线保护套管,分为基本型和防水型两类。基本型 套管外层为热镀锌钢带,中间层为钢带,里层为电 工纸。适用于明敷或暗敷在正常环境的室内场所。 防水型套管是用特殊方法在基本型套管表面,包覆 一层具有良好耐韧性软质聚氯乙烯,具有优异的耐 水性和耐腐蚀性。适用于明敷在潮湿场所或暗敷于 墙体、现浇钢筋混凝土内或直埋地下配管。
【注释】 电缆弯成“S”或“Ω”形弯是对电 缆线路经过建筑物变形缝或引入振动源设 备所引起的电缆线路的变形补偿。 8.9.8 除支架敷设在支架处固定外,电缆敷 设时,其固定点之间的距离不应大于表8.9.8 的规定。 表8.9.8 矿物绝缘(MI)电缆固定点或支 架间的最大距离