• 本课程为精品课,您可以登录eeworld继续观看:
  • (b) TAPS OVER 25 FT (7.5 m) LONG - 240.21(B)(4) ​​​​​​​
  • 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

    使用实时频谱分析仪进行 EMI诊断
    泰克公司方案,用于 EMI诊断
    zbw8200980 模拟电子
    模拟电路中的问题!请高手解答!
    阻容耦合共射放大电路中的电容起什么作用?
    czliansun 模拟电子
    2010年泰克春季创新论坛即将开幕,赶快参与啦!
    [b]泰克今年的创新论坛将提供高速串行行业标准的最新测试测量解决方案,增强知识、提高工作效率,轻松应对设计挑战![/b]时间和城市:[list][*]4月20日,上海[*]4月22日,深圳[*]4月29日,新竹[*]4月30日,台北[/list]更多详情,[color=red]请点击[/color][url=http://www.tek.com/zh/TIF/Q7/?tcode=EEWorld]h
    lhx654321 测试/测量
    大牛浅谈常用三极管经验秘籍(张飞电子)!
    [b][font=宋体][size=16pt]大牛浅谈三极管经验秘籍([/size][/font][font=宋体][size=16pt]张飞特辑)[/size][/font][font=宋体][size=16pt]![/size][/font][/b][align=left]我们要记住一些在设计过程中我们使用较多的三极管的型号。不仅要记住他们的型号,还要记住它的特点,使用范围。这里我就给大家介绍
    shijianquna 模拟电子
    ***关于VIRTUALCOPY的使用问题(在EVC下调试总出现错误怎么都解决不了,多谢各位指教了,我好着急!!)***
    我现在在做一个很简单的程序,我是个初学者。我用几个按钮控制FPGA的灯的亮灭,环境EVC4,PB。我现在面临的问题是:我只要往BANK4(即对应FPGA的地址,从MAP。A中查到他的虚拟地址是0x88000000)中写个数字就行,FPGA那边有同学在做,从里边读出数字来控制哪个灯亮即可。我只新建了个工程用VIRTUALALLOC和VIRTUALCOPY开辟了空间,编译没问题,可是我要运行在模拟器上
    gaowei821029 嵌入式系统
    磁性元件文章(续2)
    这次上传剩下的几篇文章,完毕!
    zbz0529 测试/测量

    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