• 本课程为精品课,您可以登录eeworld继续观看:
  • PROTECTION OF EQUIPMENT - 240.3 AND TABLE 240.3
  • 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

    请问在PB6中如何生成usbser.dll库?
    我用PB6+VS2005做CE系统. 发现有一个问题. 在common.bib中; @CESYSGEN IF CE_MODULES_USBSERusbser.dll$(_FLATRELEASEDIR)\usbser.dllNKSHK; @CESYSGEN ENDIF CE_MODULES_USBSER如果我注释掉; @CESYSGEN IF CE_MODULES_USBSER; @CESYSGEN
    yuffice 产业风云
    [忙里偷闲学习ufun_1]开发环境搭建
    [i=s] 本帖最后由 boming 于 2016-7-28 21:49 编辑 [/i]一.下载软件:1.)Keil MDK5.14 2.)MDKCM516 3.)Stm32f1支持包 4.)Flash下载软件5.)Stm32Cubemx配置软件。6.)Java运行包,Stm32Cubemx配置软件用。7.)CH341驱动。注:Keil MDK5版本以上,分成两部,基本主体部分和支持包部分,如果要
    boming stm32/stm8
    2407中断问题
    我做了一个时钟周期中断,发现进不了中断程序,请问这是为什么?
    3150gf 微控制器 MCU
    EEWORLD大学堂----understanding kalman filters理解卡尔曼滤波器
    understanding kalman filters理解卡尔曼滤波器:https://training.eeworld.com.cn/course/50431.通过几个案例了解使用卡尔曼滤波器的常见场景。卡尔曼滤波器是一种优化估算算法,在不确定和间接测量的情况下估算系统状态。 观看视频示例,了解卡尔曼滤波器背后的工作原理。 2.本视频介绍了解状态观测器的工作原理,并解释其背后的数学原理。 在无
    木犯001号 DSP 与 ARM 处理器
    步进电机+传感器的电梯运动的控制的论坛比赛资料
    参加论坛的步进电机一组的比赛,把自己这一组的写的东西跟大家分享一下。是传感器+步进电机的模块的,能够基本实现电机和传感器合作控制电梯的实验。但是感觉还不是很好。一是:步进电机运作起来比较慢。二是:当电机停止后在运作起来的时候不是很好。但是能够实现电机的正转,反转,停止。记录电机转动的圈数。实现电梯上下运转。通过传感器检测电梯的到来和离去,给电机发送信号来完成整个的运作。把自己写的东西发来大家看看,
    guozhiyang 微控制器 MCU
    SOPC.pdf
    SOPC.pdf
    zxopenljx 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