• 本课程为精品课,您可以登录eeworld继续观看:
  • RECEPTACLES IN BASEMENTS - 210.52(G)
  • 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

    ADI推出适合笔记本和游戏机的电源控制器
    美国模拟器件公司(ADI)发布了一款创新的电源控制器ADP3192,它适合用于提高系统稳定性和可靠性,同时为笔记本计算机、台式计算机、服务器和游戏机应用减小了印制电路板(PCB)面积并降低成本,从而扩展了其电源管理集成电路(IC)的产品种类。ADP3192凭借ADI公司的EPWM增强脉冲宽度调制体系结构,该体系结构在采用高性能处理器的系统中加快响应时间和稳压电源调节。 在完成图形处理或计算量大的任
    zbz0529 电源技术
    如何删除控制面板中的项?
    控制面板中有一些不用的选项,如蓝牙,背光调节。想把他们去掉如何操作?wince 5.0还有请问就是开始菜单中的suspend如何去掉?
    z229586 嵌入式系统
    INIT.RC分析
    [b][color=#ff660][url=http://www.cnblogs.com/perseus/archive/2012/03/19/2405503.html]INIT.RC分析[/url][/color][/b][color=rgb(94, 94, 94)][font=Verdana, Helvetica, Arial][size=13px][align=left]1,init.rc是
    Wince.Android 嵌入式系统
    采用多串变压器 LLC 控制技术的新型离线式照明驱动解决方案
    [i=s] 本帖最后由 dontium 于 2015-1-23 11:38 编辑 [/i][font=宋体][size=10.5pt]设计采用[/size][/font][font=&quot][size=10.5pt] TI UCC25710 [/size][/font][font=宋体][size=10.5pt]多串变压器[/size][/font][font=&quot][size=10.5
    德州仪器 模拟与混合信号
    N阶的螺旋方阵
    在网上看到一个题目,有点意思,给大家看看题目描述: 要求从键盘任意输入一个数n(n10),然后打印出n阶的螺旋方阵题目解释: 所谓的n阶螺旋方阵是指方阵的边长为n,其打印输出时的顺序为, 例如: 样例输入: 4 样例输出: 1 2 3 4 12 13 14 5 11 16 15 6 10 9 8 7感兴趣的可以贴出自己写的程序,大家相互学习下,呵呵
    张无忌1987 编程基础
    这次国赛大家用什么处理器呢?
    [i=s] 本帖最后由 paulhyde 于 2014-9-15 03:31 编辑 [/i]大家投投票吧~~~
    lwj19872002 电子竞赛

    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