• 本课程为精品课,您可以登录eeworld继续观看:
  • NO-NICHE LUMINAIRES - 680.23(D)
  • 登录
课程介绍
相关标签: 电子系统
Switchboards are designed with busbars for fuses or circuit breakers that are used for protecting and supplying feeders and branch circuits. Panelboards are designed with a permanently installed main circuit breaker or single set of fuses for disconnecting the number of circuit breakers or fuseholders installed to protect and supply feeders or branch circuits.

SUPPORT AND ARRANGEMENT OF BUSBARS AND CONDUCTORS
408.3

Busbars shall be held firmly in place in the enclosure and shall be arranged in such a way to allow adequate space for conductors to be terminated. Busbars shall be sized with enough capacity to handle the normal currents in amps of the electrical system. In addition, they shall carry safely any type of short-circuit or ground-fault condition.

CONDUCTORS AND BUSBARS ON A SWITCHBOARD OR PANELBOARD
408.3(A)

Conductors and busbars on a switchboard, panelboard, or control board shall be so located as to be free from physical damage. Service sections of such boards shall be separated from the other electrical components. These components shall be properly secured in an approved manner. 

Note, conductors entering a certain section shall terminate in such section, except where it is not practical for control, interconnecting conductors, or other conditions of use.

OVERHEATING AND INDUCTIVE HEATING
408.3(B)

The arrangement of busbars and conductors shall be such as to avoid overheating due to inductive effects. The inductive effect of each conductor is neutralized when grouping all conductors together. To accomplish the minimizing of heating effects, the ungrounded (phase) conductors, grounded (neutral) conductors, and equipment grounding conductors, where used, shall be in the same enclosure, raceway, cable, cord, etc. (See Figure 7-1)

显示全部 ↓
推荐视频

    猜您喜欢

    推荐帖子

    6410硬件解码和Directshow
    平台:三星6410 + wince6.0如何将三星的硬件解码加到Directshow里面.三星提供的MFCDecoderFilter加了上去好像没用.请各位指点.
    limingjing1986 嵌入式系统
    请给推荐一款STM32的开发板
    我想用STM32f103的芯片,有必要买块开发板吗?请给推荐一款不错的开发板!
    zstl stm32/stm8
    工控定义
    工控即工业控制计算机,是一种采用总线结构,对生产过程及其机电设备、工艺装备进行检测与控制的工具总称。它具有重要的计算机属性和特征,如:具有计算机CPU、硬盘、内存、外设及接口、并有实时的操作系统、控制网络和协议、计算能力,友好的人机界面等。目前工控机的主要类别有:IPC(PC总线工业电脑)、PLC(可编程控制系统)、DCS(分散型控制系统)、FCS(现场总线系统)及CNC(数控系统)五种
    jek9528 工业自动化与控制
    谈谈Sharp LCD BoosterPack中的memory LCD
    这个和金刚狼一起现身的LCD确实大有来头。第一点,贵!这个屏之前听说过,我也顺便在mouser上查了下报价(虽然跟渠道商不能比,mouser还是公道),1.35寸的96x96的黑白屏啊,这个价格(不是想黑这块屏幕)贵自然有贵的原因。第二点,为什么叫做memory LCD?这一点其实是每一个像素都有一个bit的SRAM。这样只要保证不掉电,就不再需要外部电路刷新显示。就这个原理图来说,内部还是有有电
    wstt 微控制器 MCU
    【晒样片】申请了样品,出现了一些小的波折,最后还是成功了!
    TI的样品还是比较好申请的,其中关键的是企业邮箱+座机的电话(个人觉得这个比手机好点)。选择了三款芯片,ESD保护芯片MSP430+CC1200三个芯片。加入到购物车后,点击提交。接着填写运输地址,这里开始默认的是英文页面,要将其改为中文页面,否则写地址信息的时候英文页面老报错,提交不上去。然后就是同意TI的样品申请规则,接着下一步:下面是我申请的几款芯片:最后订单确认:在TI官网上要做的事情就已
    cat3902982 TI技术论坛

    推荐内容

    可能感兴趣器件

    完成课时学习+分/次

     
    EEWorld订阅号

     
    EEWorld服务号

     
    汽车开发圈

     
    机器人开发圈

    About Us 关于我们 客户服务 联系方式 器件索引 网站地图 最新更新 手机版 版权声明

    站点相关: 汽车电子 智能硬件

    北京市海淀区中关村大街18号B座15层1530室 电话:(010)82350740 邮编:100190

    电子工程世界版权所有 京B2-20211791 京ICP备10001474号-1 电信业务审批[2006]字第258号函 京公网安备 11010802033920号 Copyright © 2005-2025 EEWORLD.com.cn, Inc. All rights reserved