• 本课程为精品课,您可以登录eeworld继续观看:
  • USED AS SERVICE EQUIPMENT - 408.3(C)
  • 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

    用户评论

    暂时无评论

    猜您喜欢

    推荐帖子

    ok2440-III的跑马灯程序,哪为大侠可以帮注解下
    /*********************LED实验*********************************/// 公司名称 :保定飞凌嵌入式技术有限公司// 描述 :跑马灯#define GPFCON (*(volatile unsigned *)0x56000050)#define GPFDAT (*(volatile unsigned *)0x56000054)#define G
    usbabc 嵌入式系统
    求合众达的6416开发板的光盘资料!
    不知道哪位好心人有这个光盘,愿意有偿购买。
    dsp_comm DSP 与 ARM 处理器
    请问各位大神,下面的switch语句会执行吗?怎么我仿真没数据
    #include "key.h"#include "delay.h"#include "lcd.h"vu8 FriNum;//定义全局变量extern unsigned char KEY_Num; //Ôúμ÷óÃμÄÎļtÖD¶¨òå°′¼üoÅ諾ֱ
    功夫佬 stm32/stm8
    lan9131接口电路
    lan9131接口电路LAN9131采用 RipStream 技术的高性能网络多媒体协处理器业界第一款采用 RipStream 技术的高性能有线 10/100 网络多媒体处理引擎,融入了多高清 (HD) 流支持, 软件协议栈管理和安全。重点LAN9131 支持 DLNA 准则的 RipStream 技术支持多高清视频流内置 UPnP, HTTP 和 TCP/IP 协议栈集成适用于数字版权管理 (D
    blogluo 嵌入式系统
    EZ430-RF250汇总
    EZ430-RF2500已经进行了快两个月了,整理完了才感觉大家好像是在一个办公室里完成的任务,基本上没有多少重复帖的,都在完成自己的小模块,最后完成EZ430-RF2500这个大模块。前一段时间大家在一直讨论板子试用的效果不是很好,经过今天我一上午的整理发现EZ430-RF2500的试用不比LM3S8962差,有好多技术含量还是很高的,帖子质量都很高。EZ430-RF2500的试用只是一个起点,
    fxw451 微控制器 MCU
    Keil仿真进不了main
    我用Keil写了一个Hello程序,然后进入仿真,可是断点却进不了main,我在startup.s里面看到有执行main的跳转,有没有人了解是什么原因?
    alwayshuu 嵌入式系统

    推荐内容

    热门视频更多

    可能感兴趣器件

     
    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