• 本课程为精品课,您可以登录eeworld继续观看:
  • LONG- AND SHORT-TIME RATINGS OF CONDUCTORS - 310.14(A)(3) AND TABLE 310.16
  • 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

大虾成语接龙
大虾成语接龙:例:平安无事 → 事不过三 → 三般两样 我先开始:→ 样样俱全
feifei 聊聊、笑笑、闹闹
电池短路以后会有什么后果呢?
电池短路是指电池的正负极直接用导线接成通路。首先,这要看是什么电池,或者说要看电池的“能量”有多大。1、如果是普通的干电池,一般不会出现剧烈的现象。因为普能电池内阻大,能量小,“烧”不起劲来。例如:普通5号短路后外表看不出任何变化,时间稍长时,用手摸电池会觉得电池变暧、发热。2、碱性电池、高容量电池,这此电池在短路的瞬间在暗处可以看见明显的火花,电流比普通电池大得多,这时电源线都会变得发热,电池也
rain 模拟电子
关于Hercules的LaunchPad的设想(给点意见啊)
不管TI是否有这样的想法,我们EEWORLD是否可以组织设计并生产一批TMS570LS0432的最小板。因为对于我们来说,评估板上的一些器件并不是必要的。:pleased:我来讲下我的想法,首先最小板是方便搭建系统和调试的,(这就是句p话)然后这也是个对EEWORLD和各位技术高手名利双收的机会。(好吧我承认“利”是没有的,但是我找不到别的词了)[[i] 本帖最后由 Sur 于 2013-6-1
Sur 微控制器 MCU
单片机加USB-HOST芯片与WM手机通信的问题
如题
zhushuping 嵌入式系统
求助:基于单片机的一种过压指示电路质料
谁有关于基于单片机的一种过压指示电路方面的质料。谢谢!我的邮箱是[email]shidengjian0009@126.com[/email]
shidj 单片机
驱动FPGA的外设的程序
那里能找到驱动FPGA外设的程序呀
wanglinacoolmm FPGA/CPLD

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