• 本课程为精品课,您可以登录eeworld继续观看:
  • RECEPTACLES IN GARAGES - 210.52(G)
  • 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

    求助,如何配置msp430f5529串口收发的寄存器
    P3SEL = BIT3 + BIT4;//设置管脚为第二功能UCA0CTL1 |= UCSWRST;//8位数据,1位停止位,奇校验UCA0CTL1 |= UCSSEL_1;//选择UCLK = ACLKUCA0BR0 = 0x3;//设置波特率9600bit/sUCA0BR1 = 0;UCA0MCTL1 = UCBRS_3+UCBRF_0;UCA0CTL1 &= ~UCSWRST;[color
    蛟龙哥哥111 微控制器 MCU
    晒晒 我的移动硬盘
    这是用E金币换的,商人,就是聪明啊,1T的,它们是按1T字节,不讲2^n关系了。
    dontium 聊聊、笑笑、闹闹
    FPGA的FIFO USB通信 CY7C68013A
    [size=6]请问,大家有谁做过CY读FPGA的FIFO然后传给上位机的实验吗?或者类似的程序?偶不知道CY在读FPGA的FIFO时,相关的那几个信号(FPGA的FIFO也有个读使能信号,再加上控制inout类型cydata也有个变量)正确的时序是怎样的。请教各位了...[/size]
    ky0611 FPGA/CPLD
    ARM开发都需要哪些东西(软件和硬件)?
    公司打算开发arm上的东西,想咨询下大家除了软件开发平台和仿真器还需要什么?价格大概是多少?先谢谢大家了
    ROCKLI202 ARM技术
    手靠近单片机会引起单片机复位???
    刚做的PIC16F877A的最小系统板,使用外部晶振,晶振电容是20pF,将教材上的一个例程烧进去后,运行正常,但是,当用手指一靠近RB口得时候,液晶屏上九只显示第一行的几个字母而已了,不知道是什么原因????开始以为是电源的问题,后面在VSS和VDD的引脚上,直接并了一个104的电容,还是不行。后来在程序里,把RB口全部设为输出,还是不行。不知道有没有人遇到过?怎么解决?
    huang0909 Microchip MCU
    你知道锂电池的容量单位mAh和Wh的不同么?
    [color=black][font=Verdana, Helvetica, Arial, sans-serif]下图这个联想的笔记本电池,也只有5600mAh,论数字还比不上三块小米电池。[/font][/color][color=black][font=Verdana, Helvetica, Arial, sans-serif]现在制约着智能手机发展的一大因素就是手机的电池,这么多年来可以说手
    7leaves 电源技术

    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