• 本课程为精品课,您可以登录eeworld继续观看:
  • (a) TAPS NOT OVER 10 FT (3 m) LONG - 240.21(B)(1)
  • 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

    请高手给自动泊车探头能探测5M设计方案
    [i=s] 本帖最后由 paulhyde 于 2014-9-15 03:42 编辑 [/i] 请高手给自动泊车探头能探测5M设计方案!
    sonbizy 电子竞赛
    紧急求救
    各位高手:我现遇到俩个问题,紧急请教:1、我用I/O口下降沿中断触发方式进入中断服务程序后,需要将出发方式改为上升沿触发,这时I/O口输入还是0,在我改后,程序就跑飞;2、我现在用的复位电路是用的电阻(100K)与二级管并联后和一电容(0.33U)组成的。在我使用过程中发现,使用电池能够正常复位,但在使用稳压电源时怎么也不能正常复位。请帮帮我,谢谢各位!
    longxin 微控制器 MCU
    活动得到的小米体重秤到了
    今天接到快递电话,说有我的快递,拿到家中一看,原来是前段时间活动小米体重秤到了,小米体重秤质量不错,拿到手沉甸甸的,精度还可以
    刘小飞 聊聊、笑笑、闹闹
    晒WEBENCH设计的过程+3.3v电源设计(第一弹)
    0本文中选择的语言是简体中文,可以在页面直接选择;也可以在myti登录页面里选择WEBENCH的默认语言,就不用每次在选择了在下图中选择中文就可以默认显示中文了1选择你要设计的类型,这里选择电源,填入相应的输入电压、输出、然后点击开始设计2进入设计页面,要稍等一会;出现对话框选择你的类型(成本,封装,效率),这里随便选择一个;如果希望对话框不在出现选择donot show again;进入页面可以
    霹雳之火 模拟与混合信号
    兑换的礼品
    年龄大了,平时多吃点枸杞。标准中年大叔配置。
    luck_gfb 聊聊、笑笑、闹闹
    射频变压器论坛上有人了解吗
    射频变压器论坛上有人了解吗就是下图的那个小东西:loveliness:
    cxy93 无线连接

    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