• 本课程为精品课,您可以登录eeworld继续观看:
  • (a) INDIVIDUAL CIRCUITS - 210.19(A)(1)(a), 210.1 AND 210.20(A)
  • 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

    用户评论

    暂时无评论

    猜您喜欢

    推荐帖子

    XDS510 DSP仿真器
    XDS510DSP仿真器主要特点:1、体积更小2、接口更加安全3、性能更加卓越4、速度较其他仿真器快一倍· 采用高速版本USB2.0标准接口,即插即用,传输速度可达480MBS,向下兼容USB1.1主机;· 标准Jtag仿真接口,不占用用户资源;特别接口安全保护设计,全面支持JTAG接口热插拔;· 支持Windows98NT2000XP操作系统;· 支持TI CCS2.X、支持CCS3.1集成开发
    levindz 51单片机
    贝叶斯-找出隔壁的老王
    [i=s] 本帖最后由 247153481 于 2015-8-28 21:52 编辑 [/i][align=left][font=宋体]鉴于论文中目标跟踪与贝叶斯有着千丝万缕的关系,不得不来捋一捋到底如何使用它[/font][/align][align=left][color=black][font=宋体][size=10.0pt]贝叶斯公式是英国学者托马斯[/size][/font][/colo
    247153481 综合技术交流
    keil4 调试程序时 如何设置断点?
    keil4 调试程序时 如何设置断点?
    QWE4562009 单片机
    【沁恒试用】三、系统时钟及TIMER0
    [i=s] 本帖最后由 lising 于 2019-7-2 15:02 编辑 [/i]本次实验利用CH549内部的定时器资源产生定时时间,控制板载的LED翻转产生闪烁效果。实验的主要目的是为了更深入地学习了解CH549的时钟系统及定时器资源。一、实验资源1、CH549EVT学习开发板;2、Keil v5.28.0.0;3、CH549开发资料汇总.rar;4、WCHISPTool v2.70;5、C
    lising DIY/开源硬件专区
    三极管CE互换??
    1. 首先不管那个LED的是否损坏 这个不考虑 只是一种构想2.测试过 当没有Q2 ,Q1是饱和的3.关键是Q2Ub = 1.3VUc = 9V有同学说三极管CE可以换 但是他也说不清楚三极管当二极管用就不会击穿么(基础很差我~~~)谢谢各位老师了。
    常见泽1 模拟电子
    请问:.tgz文件如何解压呀
    :.tgz文件如何解压呀找了半天都不行或
    yuzhxing 嵌入式系统

    推荐内容

    热门视频更多

    可能感兴趣器件

     
    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