• 本课程为精品课,您可以登录eeworld继续观看:
  • Branch Circuit Extension or Modifications – Dwelling Units - 210.12(D)
  • 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

    请教:SP485REN-L/TR频繁损坏原因
    [i=s] 本帖最后由 chenzhouyu 于 2022-10-26 20:21 编辑 [/i]大家好,请教一个关于485的问题。整个设备是金属外壳,用于船用发电机组发电机状态的监控。金属外壳外壳链接一根保护地线经由主设备PCB上的连接器连接到外部,与电源地和信号地没有电气连接。该485网络有五个节点,其中两个节点配置了120欧姆的终端电阻,每个节点上的A都加1K下拉电阻,B都连接1K上拉电阻。
    chenzhouyu 模拟电子
    迅为i.MX6ULL终结者移植ssh服务安装测试
    文章目录1 基本文件的安装2 生成 Key 文件,并安装3 修改目标板密钥文件4 测试1 基本文件的安装在文件系统busybox上新建/usr/libexec、/usr/local/etc 、/usr/local/bin 三个目录,使用命令mkdir -p /usr/libexec /usr/local/etc /usr/local/bin,如图 1.1所示。在虚拟机Ubuntu上,将 opens
    遥寄山川 嵌入式系统
    请教串口设备主动发送的数据如何获取。。我是新手
    我第一次接触串口开发,很多不明白的地方。现在手头有一设备,类似读卡器,是USB口的,装完驱动后会生成一对应的COM口。刷卡的时候,这个外界设备会向连着的主机程序发送一串ASCII字符,我该如何获得这些数据呢?我用超级终端链接这个COM口,在刷卡的时候可以获得这个字符串,这是怎么实现的呢?先谢谢各位了,另外哪里有相关的资料呢,我翻遍了DDK也没找到相关的描述文档。
    ltiqc 嵌入式系统
    锂电池 充放电 切换
    [font=宋体][color=rgb(50, 50, 50)][size=14px][size=4]最近在做一个充电系统,为小型系统供电,两节锂电池,要求是:在放电时,电量低的优先放电,该节电池放电至安全电压时自动切换另一个电池放电;充电时,优先给电量低的充电。希望大家能给点建议,谢谢啦![/size][/size][/color][/font][font=宋体][color=rgb(50, 5
    helloxx 电源技术
    高通6085CDMA2000上网卡研究
    本工作室提供EVDO无线上网卡方案的开发,有意合作的请联系qq:764918953
    passion07 嵌入式系统
    LTC1867芯片单极模式只能采样0~2V
    [i=s] 本帖最后由 清风烈酒 于 2018-1-30 12:58 编辑 [/i]在stm32f107基础上使用LTC1867芯片采样,设置单极性后只能采样要0~2V的电压,基准为4V。请大神帮忙!!!![code]#defineADC_CS_HGPIO_SetBits(GPIOA,GPIO_Pin_4);#defineADC_CS_LGPIO_ResetBits(GPIOA,GPIO_Pin_
    清风烈酒 ADI 工业技术

    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