• 本课程为精品课,您可以登录eeworld继续观看:
  • SIZING - 210.20(A), 215.3, AND 230.42(A)(1)
  • 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

    新旧电源管理IC 大PK,大家有什么问题可以写下来
    [size=2]应该说从2003年以来,电源控制IC展示出了全新的面貌.新的隔离控制IC达100余款,非隔离DC/DC达几百款.但是看看我们国内杂志介绍的技术还是老面孔.工程师选用的还是二十年前的老式IC,各位看看你们的手机换了几代了!我在这里给出几个对比的例子,看看现在的技术进步.[b][size=4][color=blue]1,PFC控制, UCC28019(ICE1PCS02)取代UC385
    七月七日晴 电源技术
    实时时钟电路设计
    1 RTC结构特点  [url=http://www.rjgc.net/control/main/main.php?bid=15][size=5][color=red]实时时钟[/color][/size][/url]的基本功能是保持跟踪时间和日期等信息,但许多RTC还提供有多种附加功能,如:看门狗定时器、系统复位、非易失存储器(NV RAM)、序列号、方波输出、涓流充电等。因此,在进行电路设计时
    sunhope 模拟电子
    电子基础知识----各种集成电路简介
    2008年03月14日 星期五 12:00第一节 三端稳压ic电子产品中常见到的三端稳压集成电路有正电压输出的78××系列和负电压输出的79××系列。故名思义,三端ic是指这种稳压用的集成电路只有三条引脚输出,分别是输入端、接地端和输出端。它的样子象是普通的三极管,to-220的标准封装,也有9013样子的to-92封装。用78/79系列三端稳压ic来组成稳
    kjf5151 模拟电子
    老爸被组织上派去云南抗旱了。。。
    带队去云南昆明打井,总共7台地质钻机。那些设备,都是能往地底下钻几百米的家伙。。。
    richiefang 聊聊、笑笑、闹闹
    利用数字电位计AD5292、运算放大器OP184和MOSFET构建具有提升输出电流的可编程高压源
    利用数字电位计AD5292、运算放大器OP184和MOSFET构建具有提升输出电流的可编程高压源
    蓝雨夜 ADI 工业技术

    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