• 本课程为精品课,您可以登录eeworld继续观看:
  • GROUNDING OF PANELBOARDS - 408.40
  • 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

    STM8的UART问题
    STM8的UART初始化完成后,不能发送数据,按例程中的再后面加上这个函数之后才能发送,想问一下大侠们,是不是在发送前还需要什么操作。。char putchar (char c){if (c == ''){/* put '' to hardware here *//* Wait transmission is completed : otherwise the first data is not
    stonepal stm32/stm8
    模拟地和数字地改如何分割与连接?
    看了一些文章,关于模拟和数字地还是有一些疑问,请大家多多指教.1.单点接地一班要求就是在AD处进行单点接地,并且明确指出不能 跨越(模拟数字地)分割线 进行信号走线,但是当我同时用到DA的时候,DA改放置到数字区还是模拟区呢?并且这时必然需要跨越分割线走线,难道在DA处在进行一次模拟数字地的连接?2.模拟和数字地的连接 有电感 磁珠 0欧姆电阻和直接铜箔连接,其中0欧姆电阻好想效果比较理想,但也看
    mwl0223 模拟电子
    【GD32F350分享】简易计步器设计
    [i=s] 本帖最后由 hanyeguxingwo 于 2018-9-22 13:57 编辑 [/i][align=center][color=#333333][font=Tahoma][b][size=4]简易计步器设计[/size][/b][/font][/color][/align][align=left][b]【发帖汇总】:[/b][/align][align=left][url=http
    hanyeguxingwo GD32 MCU
    求救ARM300 的问题
    本人做课设,遇到很简单的一个问题。。。。。。。但是解决不了。。。。我的源码如下/************************************************************************************************//本实验要求实现部分//1、MainTask中按键消息获取,处理//2、按键处理函数OnKey()函数//3、创建串口处理任务
    eestudent ARM技术
    vivado仿真输出波形信号输入全为Z,输出全为X
    源文件:`timescale 1ns / 1psmodule clk_counter(inputsys_clk,inputrst_n,inputgate,output reg[31:0]clk_cnt,output regcounter_valid);always@(posedge sys_clk or negedge rst_n)beginif(rst_n == 1'b0)beginclk_cn
    1nnocent FPGA/CPLD
    嵌入式发展方向
    各位大大好,我是一名即将毕业的学生,学习嵌入式,至此,仍对嵌入式以后的发展存在疑虑。在历年国内外大会上,嵌入式技术已被论为日后电子发展方向的潮流。在每年的双选会上,依然充斥着各种java,移动开发,数据库,云端,网络安全之类的传统职位,嵌入式的很少。当前社会是信息化的,人们的生活是朝着智能化发展的,这就为嵌入式提供了很强的市场需求。但是,那些貌似不远的生活猜想依然得不到落实。我没学过多少东西,不知
    花心大萝卜 工作这点儿事

    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