• 本课程为精品课,您可以登录eeworld继续观看:
  • (a) NUMBER ON A CIRCUIT - 210.11(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

    猜您喜欢

    推荐帖子

    招聘VC软件工程师
    [img=210,152]http://pic.baike.soso.com/p/20120704/20120704111013-1365166075.jpg[/img]本职位挑战高薪,有意者可来应战哦[img=60,60]http://www.2259.com/pic/biaoqing/201041/20104242039538326.gif[/img]一定来哦,52297030;[color=
    kckj 求职招聘
    调查一下我们工程师经常光顾的购物网站都有哪些?
    [font=微软雅黑][size=3]随着电商的逐渐普及和飞快发展,如今坐在家里敲几下键盘几乎能买到世界各地的东西{:1_103:}[/size][/font][font=微软雅黑][size=3]那么,[b]我们电子工程师经常光顾的购物网站都有哪些呢?欢迎大家跟帖分享你经常购物的网站,如果方便,也可以分享下你在那个网站买的超高性价比宝贝[/b][/size][/font]:congratulat
    eric_wang 聊聊、笑笑、闹闹
    晒晒我的东西,关于SD卡的
    [img]http://www.prog430.com/pic/SDV6/IMG_5577.JPG[/img][img]http://www.prog430.com/pic/SDV6/IMG_5574.JPG[/img]那个带SD卡的是个模块,带处理器,整合了FAT32,接口是串口(UART)51单片机串口115200bps读写,写入后文件样子如下:[img]http://www.prog430.
    nuanshuiping 嵌入式系统
    我来水一贴。。。quartus2 11.0 破解这么坑
    最近使用quartus211.0 版本的软件,网上下载了好多版本的激活软件都不能激活,后来发现是我的物理地址填错了(NIC),因为我们电脑可能有多个网卡,所以就会有多个物理地址,网上别人的说的可以通过quartus 软件 Tools->license setup 查看物理地址,但是要注意这里的地址是你的多个物理地址都贴出来了,中间用逗号隔开,但是我们在license中替代xxxxxxx的时候必须用
    扬帆起航 FPGA/CPLD
    程序调不出来了,崩溃中,,,
    在一个工程中做了些改动,其中一个函数分离出去测试,怎么测怎么通,,一点问题没有,放到大程序里就一点反应没有了,,崩溃了。。支持一下啊,希望能调通。。。[[i] 本帖最后由 aahellaa 于 2011-8-16 10:29 编辑 [/i]]
    aahellaa 微控制器 MCU
    2011竞赛题
    [i=s] 本帖最后由 paulhyde 于 2014-9-15 09:00 编辑 [/i]顶一下
    407957119 电子竞赛

    推荐内容

    热门视频更多

    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