• 本课程为精品课,您可以登录eeworld继续观看:
  • LIGHTING OUTLETS IN UNDERFLOOR SPACES - 210.70(C)
  • 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

    求助 变压器布线需要注意什么呢?
    我是新手,以前都是用充电电池来给电路供电的,但做项目的话不可能总是用充电电池来吧,所以想问问大家在设计PCB的时候用变压器降压的注意事项,以前实在是没怎么接触过相关电路,在网上也没搜出很有价值的东西也不明白什么是比较重要的,所以想问问,在设计pcb走线的时候,用变压器降压的话都需要考虑什么?需要开槽吗?可以推荐点相关的资料吗?谢谢大家啦!
    hahadiy PCB设计
    有关电源管理芯片IC芯片厂商,知道几个?
    [size=4]与逻辑芯片和内存芯片不同,电源管理芯片在众多种类的芯片中并没有那么知名,但随着智能化理念深入生活的方方面面,各类终端产品有了更高的应用需求,对于电源管理芯片的要求也就随之提高了。[/size][size=4][/size][size=4]电源管理IC应用趋于细分化 这些厂商们准备好了吗?[/size][size=4][/size][size=4]苹果正在为iPhone和iPad 开
    qwqwqw2088 模拟与混合信号
    求大神帮忙设计下这个倒车雷达的PCB电路图,原理图已经画好了
    :kiss:帮忙解决好的,我将感激不尽哈!速求大神相助啊!
    手扒鸡 PCB设计
    【推荐】Quartus II使用、编程及下载教程---适合小白入门的专业超级详细教程
    ###**第一步:新建工程**【切记:顶层文件的实体名作为工程名!!!!!】File =》New Project Wizard...=》选择工程目录,指定工程名及设计入口,不能有中文路径=》添加已有文件,如果新建的工程,则直接跳过=》器件选择,需要与实际用到的器件相同,Family选择Cyclone IV E,Available device这里选择EP4CE6F17C8;=》设置工具,一般直接n
    LegendNing FPGA/CPLD
    谁玩过eNOVA X-Wall芯片?
    介绍下吧,不知道能不能用在SATA上
    123456789000 嵌入式系统
    利尔达出的430的中文手册
    最近刚刚开始学习,找到些资料也分享分享。
    kingdog 微控制器 MCU

    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