• 本课程为精品课,您可以登录eeworld继续观看:
  • DERATING FOR AMBIENT TEMPERATURE CORRECTION FACTORS - TABLES 310.15(B)(1) AND (B)(2)
  • 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

    模电
    [backcolor=rgb(239, 245, 249)]请高手们给推荐几本书,看懂电路图的,尤其是功率放大器之类的,大学学的《电路》-邱关源,《模拟电子电路基础》-童诗白,华成英,还有哪些?给推荐一下啊。谢谢了。[/backcolor]
    yangsqiaos 模拟电子
    请教一个元件问题
    差分输入用的VISHAY 的孪生JFET管2N5565 的管身上有写HOT是什么意思?[:)]
    VKLAM 模拟电子
    计算机无线网络技术在港口集装箱作业环境中的应用
    摘要: 对计算机无线网络通讯技术在港口野外工作环境的应用进行了详细的讨论 , 并给出具体的解决技术方案. 使得港口经营业务管理信息系统 (MIS) 在语音、视频和数据三合一的无线网络通讯平台上 , 将移动计算机终端拓展到港口码头前沿的作业现场. 本方案解决了港口经营业务管理系统 (MIS) 信息处理的数据滞后和生产中断现象 , 提高了港口集装箱吞吐作业效率.
    frozenviolet 无线连接
    Wallys 5G 17dBi panel antenna  support 802.11ac 802.11ax linear verticl
    DR5G17support 802.11ac/ax, mmcx connector5G 17dBi panel antenna1. Feature* 17dBi Dual Polarized Micro strip Antenna Array* 5GHz of frequency* MMCX connector* Support 802.3 11AX/AC/AN* RoHS compliance2
    wallys PCB设计
    今天上午10:00 有奖直播:【开拓IoT社会 尼吉康的新蓄电装置】
    今天上午10:00 有奖直播:【开拓IoT社会 尼吉康的新蓄电装置】[url=https://bbs.eeworld.com.cn/huodongform/index.php?id=262&sid=107][b][font=微软雅黑][size=4]>>点此进入直播[/size][/font][/b][/url][backcolor=red][color=#ffffff]直播时间:[/color]
    EEWORLD社区 无线连接
    单电源的交流/直流变换怎么实现
    请问怎么才能做到单电源的交流/直流变换?感谢
    xiaoxiao1 测试/测量

    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