欢迎来到麦多课文档分享! | 帮助中心 海量文档,免费浏览,给你所需,享你所想!
麦多课文档分享
全部分类
  • 标准规范>
  • 教学课件>
  • 考试资料>
  • 办公文档>
  • 学术论文>
  • 行业资料>
  • 易语言源码>
  • ImageVerifierCode 换一换
    首页 麦多课文档分享 > 资源分类 > PDF文档下载
    分享到微信 分享到微博 分享到QQ空间

    ANSI UL 452-2006 UL Standard for Safety Antenna - Discharge Units (Seventh Edition Reprint with Revisions Through and Including December 23 2015).pdf

    • 资源ID:439232       资源大小:559.76KB        全文页数:12页
    • 资源格式: PDF        下载积分:10000积分
    快捷下载 游客一键下载
    账号登录下载
    微信登录下载
    二维码
    微信扫一扫登录
    下载资源需要10000积分(如需开发票,请勿充值!)
    邮箱/手机:
    温馨提示:
    如需开发票,请勿充值!快捷下载时,用户名和密码都是您填写的邮箱或者手机号,方便查询和重复下载(系统自动生成)。
    如需开发票,请勿充值!如填写123,账号就是123,密码也是123。
    支付方式: 支付宝扫码支付    微信扫码支付   
    验证码:   换一换

    加入VIP,交流精品资源
     
    账号:
    密码:
    验证码:   换一换
      忘记密码?
        
    友情提示
    2、PDF文件下载后,可能会被浏览器默认打开,此种情况可以点击浏览器菜单,保存网页到桌面,就可以正常下载了。
    3、本站不支持迅雷下载,请使用电脑自带的IE浏览器,或者360浏览器、谷歌浏览器下载即可。
    4、本站资源下载后的文档和图纸-无水印,预览文档经过压缩,下载后原文更清晰。
    5、试题试卷类文档,如果标题没有明确说明有答案则都视为没有答案,请知晓。

    ANSI UL 452-2006 UL Standard for Safety Antenna - Discharge Units (Seventh Edition Reprint with Revisions Through and Including December 23 2015).pdf

    1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL 452 Antenna Discharge UnitsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPROD

    2、UCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL Standard for Safety for Antenna Discharge Units, UL 452 Seventh Edition, Dated November 2, 2006 Summary of Topics This revision of ANSI/UL 452 is being issued to reaffirm approval as an American National Standard. No changes in requirements are in

    3、volved. The new and revised requirements are substantially in accordance with Proposal(s) on this subject dated November 6, 2015. Text that has been changed in any manner or impacted by ULs electronic publishing system is marked with a vertical line in the margin. All rights reserved. No part of thi

    4、s publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, electronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Standard as is without warranty of any kind, either expressed or implied, including bu

    5、t not limited to, the implied warranties of merchantability or tness for any purpose. In no event will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inab

    6、ility to use this Standard, even if UL or an authorized UL representative has been advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Standard, regardless of the form of the claim. Users of the electronic versions of ULs Stan

    7、dards for Safety agree to defend, indemnify, and hold UL harmless from and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Standard on the purchasers compu

    8、ter system. DECEMBER 23, 2015 UL 452 tr1UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL DECEMBER 23, 2015 UL 452 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM

    9、UL NOVEMBER 2, 2006 (Title Page Reprinted: December 23, 2015) 1 UL 452 Standard for Antenna Discharge Units First Edition December, 1953 Second Edition July, 1967 Third Edition April, 1972 Fourth Edition October, 1977 Fifth Edition November, 1987 Sixth Edition August, 1993 Seventh Edition November 2

    10、, 2006 This ANSI/UL Standard for Safety consists of the Seventh Edition including revisions through December 23, 2015. The most recent designation of ANSI/UL 452 as a Reaffirmed American National Standard (ANS) occurred on December 23, 2015. ANSI approval for a standard does not include the Cover Pa

    11、ge, Transmittal Pages, Title Page, or effective date information. Comments or proposals for revisions on any part of the Standard may be submitted to UL at any time. Proposals should be submitted via a Proposal Request in ULs On-Line Collaborative Standards Development System (CSDS) at http:/. ULs S

    12、tandards for Safety are copyrighted by UL. Neither a printed nor electronic copy of a Standard should be altered in any way. All of ULs Standards and all copyrights, ownerships, and rights regarding those Standards shall remain the sole and exclusive property of UL. COPYRIGHT 2015 UNDERWRITERS LABOR

    13、ATORIES INC. UL 452-2011 (R2015)UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 2, 2006 ANTENNA DISCHARGE UNITS - UL 452 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT P

    14、ERMISSION FROM UL CONTENTS INTRODUCTION 1 Scope .4 2 References 4 CONSTRUCTION 3 General 4 4 Enclosure 4 5 Protection Against Corrosion .4 6 Insulating Material 5 7 Current-Carrying Parts 5 8 Terminals 5 9 Fuses .6 PERFORMANCE 10 Internal Resistance .6 11 Discharge Test .6 12 Installation Test 6 MAR

    15、KING 13 Details 7 NOVEMBER 2, 2006 ANTENNA DISCHARGE UNITS - UL 452 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL INTRODUCTION 1 Scope 1.1 These requirements cover antenna-discharge units for radio and television receiving equipment and a

    16、mateur radio-transmitting and -receiving equipment, to be employed in accordance with the National Electrical Code, NFPA 70. 1.2 An antenna-discharge unit hereinafter referred to as a discharge unit as covered by these requirements consists of a gap, a xed resistance or other discharge element, or a

    17、 combination of such features, connected between each antenna lead-in terminal and a grounding terminal. 2 References 2.1 Any undated reference to a code or standard appearing in the requirements of this standard shall be interpreted as referring to the latest edition of that code or standard. CONST

    18、RUCTION 3 General 3.1 A gap-type discharge unit shall have a xed gap that is constructed so that it cannot be readily altered or adjusted in the eld. 3.2 A discharge unit of other than the gap type shall be constructed so that the resistance between the antenna and ground terminals cannot be readily

    19、 altered or adjusted in the eld. 4 Enclosure 4.1 The discharge chamber of a discharge unit shall be dust tight and, if the discharge unit is intended for outdoor use, the discharge chamber shall be watertight. 4.2 A discharge unit shall have means for mounting. 5 Protection Against Corrosion 5.1 Iro

    20、n and steel parts shall be protected against corrosion by enameling, galvanizing, plating, or an equivalent means. NOVEMBER 2, 2006 ANTENNA DISCHARGE UNITS - UL 452 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6 Insulating Material 6.1 A

    21、 base or body for the mounting or enclosing of uninsulated live parts shall be of moisture-resistant insulating material. 6.2 Material for the mounting of uninsulated live parts shall be porcelain, phenolic composition, or other material acceptable for the application. Fiber and rubber are not accep

    22、table. A material other than the above shall be appropriately investigated. 7 Current-Carrying Parts 7.1 A current-carrying part shall be brass, phosphor-bronze, carbon, or other corrosion-resistant material. Exception: A grounding strap may be stainless steel, or sheet steel if it is protected agai

    23、nst corrosion by a zinc or an equivalent metallic coating. See the exception to 8.1, and 12.1. 8 Terminals 8.1 A discharge unit for receiving equipment shall be provided with terminals for the connection of: a) The antenna, and b) 17 AWG or larger grounding leads. Exception: A discharge unit intende

    24、d for indoor use only may be provided with a grounding strap for direct connection to a metal water-pipe ground in place of a terminal for a grounding lead. 8.2 A discharge unit for transmitting equipment shall be provided with terminals for the connection of: a) The antenna, and b) 10 AWG or larger

    25、 grounding leads. 8.3 Terminals employing means other than wire-binding screws or stud terminals with nuts may be employed for the connection of the antenna leads if the construction is shown by investigation to be acceptable. The investigation is to include tests to determine whether contact is mad

    26、e with the conductors of the antenna leads. 8.4 A wiring terminal shall be prevented from turning, and shall not employ a setscrew form of contact. 8.5 A wire-binding screw shall be provided with upturned lugs or the equivalent, and shall thread into metal. 8.6 A terminal plate tapped for a wire-bin

    27、ding screw shall be of metal not less than 0.030-inch thick. There shall be two or more full threads in the metal. The metal may be extruded at the tapped hole to provide at least two full threads. MARCH 23, 2007 ANTENNA DISCHARGE UNITS - UL 452 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER RE

    28、PRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 8.7 A grounding terminal shall be provided with upturned lugs, a cupped washer, or the equivalent capable of retaining a grounding conductor of the size specied in 8.1 and 8.2 under the head of a screw or washer. 9 Fuses 9.1 A fuse employed in a

    29、discharge unit shall not be connected in the circuit between an antenna terminal and the grounding terminal. PERFORMANCE 10 Internal Resistance 10.1 Each of six samples of a discharge unit shall have an internal resistance of not less than 75,000 ohms between each antenna terminal and the grounding

    30、terminal. 10.2 To determine whether a discharge unit complies with the requirement in 10.1, a direct-current potential of 6 volts is to be applied between each antenna terminal and the grounding terminal, and the current ow is to be measured by a microammeter. 11 Discharge Test 11.1 Each of six samp

    31、les of a discharge unit shall discharge when subjected to ve successive applications of a direct-current potential of 500 volts from a 2-microfarad capacitor. After the fth application of the test voltage, the internal resistance between each antenna terminal and the grounding terminal shall not be

    32、less than 75,000 ohms, and the antenna-ground circuit of a discharge unit employing a resistor shall not open. 11.2 A discharge unit of the gap type shall comply with the requirement in 11.1 and shall be investigated to determine that successive discharges will not result in an increased gap. 12 Ins

    33、tallation Test 12.1 A discharge unit employing a grounding strap shall withstand without damage, a tightening torque of 150 pound-inches applied to each clamping bolt or screw when assembled on the grounding electrode with which it is intended to be used. Exception: A torque of 50 pound-inches is to

    34、 be applied to a clamping screw intended to be tightened using a screwdriver only. 12.2 With reference to the requirement in 12.1, two samples of a discharge unit are to be tested, except that if a unit is designed for use with a range of electrode sizes, four samples are to be tested two samples wi

    35、th the largest size electrode and two with the smallest size. NOVEMBER 2, 2006 ANTENNA DISCHARGE UNITS - UL 452 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL MARKING 13 Details 13.1 A discharge unit shall be plainly marked, where it will

    36、be visible after installation, with the manufacturers name, trademark, or other descriptive marking by which the organization responsible for the product may be identied, and a distinctive catalog number or the equivalent. 13.2 A discharge unit intended for indoor use only shall be permanently marke

    37、d For Indoor Use Only, or the equivalent. 13.3 A discharge unit shall not be marked Lightning Arrester, but may be marked Antenna-Discharge Unit, Discharge Unit, or the equivalent. 13.4 The terminals of a discharge unit shall be plainly marked Antenna and Ground, or with equivalent symbols or abbrev

    38、iations, to indicate the proper connections. Exception: The markings may be omitted if the proper connection are obvious to the user. 13.5 A strap provided for connecting a discharge unit to a metal water-pipe ground shall be marked with the pipe size, or range of sizes, with which it is intended to

    39、 be used. 13.6 If a manufacturer produces or assembles an antenna discharge unit at more than one factory, each nished device shall have a distinctive marking, which may be in code, by which it may be identied as the product of a particular factory. NOVEMBER 2, 2006 ANTENNA DISCHARGE UNITS - UL 452 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL NOVEMBER 2, 2006 ANTENNA DISCHARGE UNITS - UL 452 8 No Text on This Page


    注意事项

    本文(ANSI UL 452-2006 UL Standard for Safety Antenna - Discharge Units (Seventh Edition Reprint with Revisions Through and Including December 23 2015).pdf)为本站会员(吴艺期)主动上传,麦多课文档分享仅提供信息存储空间,仅对用户上传内容的表现方式做保护处理,对上载内容本身不做任何修改或编辑。 若此文所含内容侵犯了您的版权或隐私,请立即通知麦多课文档分享(点击联系客服),我们立即给予删除!




    关于我们 - 网站声明 - 网站地图 - 资源地图 - 友情链接 - 网站客服 - 联系我们

    copyright@ 2008-2019 麦多课文库(www.mydoc123.com)网站版权所有
    备案/许可证编号:苏ICP备17064731号-1 

    收起
    展开