• 本课程为精品课,您可以登录eeworld继续观看:
  • RECEPTACLES INSTALLED IN KITCHENS OF COMMERCIAL AND INDUSTRIAL BUILDINGS - 210.8(B)(2)​​​​​​​
  • 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

    Zigbee bootloader编译报错问题
    [color=red]最近这段时间一直在研究无线固件升级和串口升级固件,在研究中出现了好多问题,有些问题在TI官方文档和在TI官方论坛也没找到答案,发的帖基本就是没人搭理成了死帖。在论坛或QQ群经常看到初学者问是否可以串口下载zigbee程序呢?我刚学zigbee时也问过老板,老板说不行,只支持用仿真器烧写。后来慢慢学,发现真的是可以串口烧写程序,TI官方的资料也讲了如何制作可以用串口烧写的bin
    wateras1 无线连接
    十种常见照明电路
    [i=s] 本帖最后由 木犯001号 于 2015-11-10 10:00 编辑 [/i]随着我国经济的不断发展,电气技术也在日渐普及,各个行业中从事电气工作的人员也越来越多,这就要求广大从事电工、机械设备操作的技术人员与时俱进,掌握更多的电气方面的设计、安装以及更实际的操作维修技能。为了帮助广大从事电气工作人员掌握更多的电工电路连接的应用知识,特选取十例常见照明电路,目的是给初、中级电工技术人员
    木犯001号 电源技术
    stm32 fsmc总线操作nor flash时候的地址移位问题
    #define ADDR_SHIFT(A) (Bank1_NOR2_ADDR + (2 * (A)))#define NOR_WRITE(Address, Data)(*(vu16 *)(Address) = (Data))NOR_Status FSMC_NOR_EraseBlock(u32 BlockAddr){NOR_WRITE(ADDR_SHIFT(0x05555), 0x00AA);第一步
    asd046012 stm32/stm8
    如何选择传感器
    我想买个传感器,采集脉搏信号,连接电源电路和放大滤波电路,有谁推荐一个便宜的给我?
    iwtxk_tq 嵌入式系统
    MSP430 时钟模块时钟管理子函数
    下边是msp430的时钟管理子函数,使用于大多数的MSP430芯片。void Init_Clk(void){unsigned char i;WDTCTL = WDTPW + WDTHOLD;//关闭看门狗BCSCTL1 = ~XT2OFF;//打开XT振荡器BCSCTL2 |= SELM_2 + SELS;//MCLK为8MHZ,SMCLK为1Mhzdo{IFG1 = ~OFIFG;//清楚震荡错
    灞波儿奔 微控制器 MCU
    学模拟+《运算放大器噪声优化手册》读书笔记〈六〉
    [i=s] 本帖最后由 dontium 于 2015-1-23 11:11 编辑 [/i][size=5]跳跃噪声阅读笔记跳跃噪声是双极性晶体管基极电流的突变或跳变,或是FET晶体管门限电压的跳变。又叫爆米花噪声,因为使用扬声器播放时,听起来就像爆米花在跳动。通常出现在低频(0-1Hz)[/size][size=5]产生原因:由于电荷陷阱或是半导体材料中的细微缺陷导致的。重金属原子污染式已知的噪声
    一潭清水 模拟与混合信号

    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