• 本课程为精品课,您可以登录eeworld继续观看:
  • DERATING DUE TO OBSTRUCTIONS - 311.60(C)(2)(a) TO TABLES 311.60(C)(77) THRU 311.60(C)(86)
  • 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

    贴片电阻电容受潮会造成什么影响?
    [size=14px]目前的状况是,原本的电路板都是有涂上防潮漆的。[/size][size=14px]但是不知道为什么有一批没有涂到就出货了,想请问一下电阻电容如果受潮,电阻值发生改变以外,电容容值会有变化吗?[/size][size=14px]不考虑电路设计,单纯考虑料件会造成的结果,谢谢。[/size]
    bluefox0919 DIY/开源硬件专区
    为特斯拉车主构思设计的一款蓝牙刹车踏板监测器
    最近特斯拉刹车失灵事件闹得沸沸扬扬,一位女车主驾驶特斯拉汽车发生交通事故,车主以刹车失灵为由对特斯拉进行两个月的维权,而在闹剧发酵到顶峰后,特斯拉才提供了车辆发生事故前一分钟的数据,并简要公布了事故前30分钟的车辆驾驶状况。这件事情,双方始终各执一词,不过,事情的核心就是特斯拉刹车到底有没有失灵?我们就简单了解下特斯拉的刹车系统吧。刹车系统作为汽车最重要的安全保障部件,决定了这辆车是否合格因素之一
    疯狂的阿尔夫 综合技术交流
    【PSoC4心得】初步了解 PSoC
    [align=left][size=3][color=#000000]第一次听说[font=Calibri]PSoC [/font]是去年在一次[font=Calibri] Cypress [/font]与[font=Calibri]ARM [/font]合作的研讨会上[font=Calibri],[/font]当时的主角是[font=Calibri]NXP ,TI,Freescale [/fon
    Study_Stellaris 单片机
    计算机控制仪表
    没做昨相关这方面相关的软件,请大伙给点建议,谢谢有种设备仪表,现在要用工控机通过数据采集获得的数据,如果采集到的数据达到某种界限,则发出警报,并且自动控制该仪表,让仪表中的数据正常?我想问,这个通过软件来控制这个仪表需要那些方面的知识,这种软件我该如何在电脑测试?
    lxhsea 嵌入式系统
    【T叔藏书阁】《STM32菜鸟学习手册-啰嗦版》
    [b][url=https://download.eeworld.com.cn/detail/tyw/561849][color=#0066cc]《STM32菜鸟学习手册-啰嗦版》[/color][/url][/b]
    tyw 下载中心专版
    射频走线50Ω阻抗控制?
    [b]射频走线50Ω阻抗控制[font=宋体]?[/font][/b]
    gurou1 PCB设计

    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