• 本课程为精品课,您可以登录eeworld继续观看:
  • RACEWAYS AND CABLES EXPOSED TO SUNLIGHT ON ROOFTOOPS - 310.15(B)(2) AND Ex
  • 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

    WiFi 6克服 RF 挑战的技巧分享
    WiFi 6,随着数据吞吐量增加(高出 Wi-Fi 5 4 倍),每个节点的用户数量增多(Wi-Fi 5 容量的 4 倍),Wi-Fi 最终产品中的 RF 设计也日益复杂。不仅调制方案增加到 1024 QAM,达到 Wi-Fi 5 无线速度的 4 倍,而且接收器的灵敏度和功率放大器 (PA) 的线性度也变得更具挑战性。克服 RF 挑战的技巧:QAM 增加(例如 1024)意味着 Wi-Fi 6 制
    alan000345 无线连接
    读取CF卡的序列号的问题
    我的程序如下:是在网上弄到的。// getCFSerialNumber.cpp : Defines the entry point for the application.//#include "stdafx.h"//my code#include#include#define IOCTL_DISK_BASE FILE_DEVICE_DISK#define IOCTL_DISK_GET_STORA
    paraller 嵌入式系统
    Ubuntu中mount挂载U盘提示挂载点不存在怎么解决?
    Ubuntu中mount挂载U盘提示挂载点目录不存在,可是目录已经用mkdir建立了,并且用ls也能查看到,为什么一直提示挂载目录不存在?换了已有的其他目录也提示不存在,这个要怎么怎么解决?
    shijizai Linux开发
    收个红外热成像
    300以内可以考虑,具体详谈,加我神兽,2569863810:lol
    kiroking 淘e淘
    求助AD软件安装包
    哪位大神能给我发一个AD软件安装包吗?之前的安装包被我不知道怎么弄丢了,真是感激不尽,谢谢!邮箱[email]1095355440@qq.com[/email]
    素年白衣 PCB设计
    CE 网络连接
    这两天在搞3G的东西,因为我们现在的模块用的是USB接口,然后模拟成一个COM6进行通信,在CE的:控制面板->网络连接 里要新建一个连接,选择“拨号连接”然后设置好区域代码,还有附加解调器命令+CGDCON,"IP","CMNET",modem选择,与modem的串口通信速率等信息,然后连接,这上可以实现上网,我们现在要实现的功能是,让用户只点击一个ICON,就能实现上网,不用这么麻烦去设置。现
    jewel2004tj 嵌入式系统

    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