• 本课程为精品课,您可以登录eeworld继续观看:
  • DISCONNECTING MEANS FOR FUSES - 240.40
  • 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

    陕西杨工c8051f单片机博客
    手机 13002928013http://c8051fmcu.blog.sohu.com
    killer302vs 嵌入式系统
    【LPC54100】+MPU6050 IIC总线模拟程序设计
    [align=left]对于LPC54102的IIC驱动还需要好好研究下,现在先使用io模拟IIC来测试MPU6050.[/align][align=left][align=left][/align][align=left]#define SET_SCL_OUTPUTChip_GPIO_SetPinDIROutput(LPC_GPIO,0, 23)[/align][align=left]#defi
    youzizhile NXP MCU
    基于MC9S08LL16/8设计的锂电池充电系统方案
    一、锂电池的介绍:1、锂电池的概述:锂电池是一类由锂金属或锂合金为负极材料、使用非水电解质溶液的电池。最早出现的锂电池来自于伟大的发明家爱迪生,使用以下反应:Li+MnO2=LiMnO2该反应为氧化还原反应,放电。由于锂金属的化学特性非常活泼,使得锂金属的加工、保存、使用,对环境要求非常高。所以,锂电池长期没有得到应用。但现在锂电池已经成为了主流。2、锂电池的特点:2.1、具有更高的能量重量比、能
    wkj 工业自动化与控制
    【小梅哥SoC】win10下生成preloader报Failed to open gdrive/…/uboot-socfpga.tar.gz
    [i=s] 本帖最后由 小梅哥 于 2019-1-29 11:27 编辑 [/i]经常有SoC开发的网友跟着小梅哥的SoC开发教程在Win10下开发SoC时,在SoC EDS下编译Uboot时出现无法解压uboot源码的问题(如标题描述),因此小梅哥特意去Intel技术官网找到了这篇解决方案的帖子,并进行了简单的翻译。解决方案原文链接:[url=https://www.intel.com/cont
    小梅哥 FPGA/CPLD
    C8051F31xTBC 目标板原理图
    C8051F31xTBC 目标板原理图
    tianyueyou 51单片机
    测试LCD时,出现色块
    用专业的测试图片(24位),放在板子上测试LCD屏时,出现了一些色块,象水彩画一样。请问有人遇到过吗?[img]C:\Documents and Settings\Administrator\桌面\color_test\86687_h.jpg[/img]
    shaowei1108 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