• 本课程为精品课,您可以登录eeworld继续观看:
  • SIZING - 210.20(A), 215.3, 230.42(A)(1), AND 230.90(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

    本人初学嵌入式,求一些简单的程序
    比如控制数码管、键盘、LCD的希望能给我发一下jimmy111529@sohu.com
    lynker 嵌入式系统
    各位高人 请问谁有详细点的基于cpld信号发生器的设计资料....
    各位大侠们 有CPLD 信号发生器的设计的资料的请帮帮忙~~~谢谢
    wangsheng11 FPGA/CPLD
    请教此处窗口比较器的作用
    这个地方使用窗口比较和使用单比较器的区别是什么?[url]https://m.eeworld.com.cn/ic_article/263/1774.html[/url]
    littleshrimp 模拟电子
    74hc595级联时如何写入数据
    用单个595,编写程序成功。可是两个级联不知如何写入数据使LED灯逐个点亮。请指教,一片595的代码如下:#include reg52.h //51芯片管脚定义头文件#include intrins.h //内部包含延时函数 _nop_(); #define uchar unsigned char#define uint unsigned intuchar code DAT[8]={0xfe,0x
    esobao 51单片机
    ATMLH118 2FC D 可以替换AT24C512吗?
    网上找不到ATMLH118 2FC D 的资料啊
    wanghlady 单片机
    FPGA课件
    本课件下载与61eda
    zhangkai0215 FPGA/CPLD

    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