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

    UL 1088 CRD-2018 UL Standard for Safety Temporary Lighting Strings - Section Paragraph Reference 18 1 4 Subject Metallic Lamp Guards that are Unlikely to Become Energized (Edition.pdf

    • 资源ID:1067320       资源大小:29.90KB        全文页数:2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。

    UL 1088 CRD-2018 UL Standard for Safety Temporary Lighting Strings - Section Paragraph Reference 18 1 4 Subject Metallic Lamp Guards that are Unlikely to Become Energized (Edition.pdf

    1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared by UL LLC. It is normative for the applicable ULProduct Certification Program(

    2、s); however, it is currently not part of the UL Standard(s) referencedbelow.Product Category (CCN): XBRT, XBRT7Standard Number: UL 1088Standard Title: Standard for Temporary Lighting StringsEdition Date: July 10, 2015Edition Number: 7Section / Paragraph Reference: 18.1.4Subject: Metallic Lamp Guards

    3、 that are Unlikely to Become EnergizedDECISION:18.1.4 A metal lamp guard with or without a nonmetallic coating shall be positively bonded to theequipment grounding conductor of the string.Exception No. 1: A metal lamp guard that is shipped separate from the lampholder shall be provided withinstructi

    4、ons (see 44.17) for positive connection to the equipment grounding conductor of the string unlessthe bonding connection is automatically obtained.Exception No. 2: A metal lamp guard that must be removed for relamping shall be designed so that thebonding connection is automatically provided on assemb

    5、ly to the lampholder.Exception No. 3: A metal lamp guard of a temporary lighting string employing non-replaceable lightsources that is unlikely to become energized.RATIONALE FOR DECISION:Prior to the 6th Edition, UL 1088 only covered temporary lighting strings employing Edison screw baselampholders.

    6、 As a result the requirements were broadly written to mitigate inherent risks of electric shockassociated with the use of replaceable lamps in a construction site environment. Now the scope of UL1088 also covers temporary lighting strings employing non-replaceable LED light sources. This allowssome

    7、of the specific risk of shock conditions originally anticipated by the standard to be eliminated ormitigated by product design. While this CRD does not modify the existing requirements applicable totraditional lighting strings employing lamps with Edison screw bases, it provides an alternative appro

    8、achfor grounding requirements in new temporary lighting strings with non-replaceable LED light sources.The potential risk of electric shock is addressed in ANSI/UL 1088 / CAN/ULC-S1088 by multiple layers ofconstruction requirements including minimum spacings, adequacy of insulation, grounding and bo

    9、nding,as well as testing requirements including abnormal operation, dielectric voltage withstand and continuitytests.However, regardless of construction design Clause 18.1.4 of the standard requires all temporary lightingstrings provided with metal guards to have the guard bonded to the equipment gr

    10、ounding conductor(EGC). This is to further mitigate the potential risk of electric shock even during relamping when the guardcould inadvertently become energized from an exposed screwshell. The standard did not anticipate newconstructions of temporary lighting strings with non-replaceable LEDs where

    11、 a metallic lamp guard maybe provided as a decorative feature only.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThe Canadian standards for portable luminaires CSA C22.2 No. 250.4, which also covers temporarylighting strings, and the US stan

    12、dard for portable luminaires ANSI/UL 153 both have provisions to allowaccessible non-current carrying parts that are suitably insulated and not likely to become energized to beprovided without being bonded to the EGC.An equivalent provision is needed in ANSI/UL 1088 / CAN/ULC-S1088 to accommodate ex

    13、posed metalparts of temporary lighting strings that are unlikely to contact live parts under any condition of use,including during installation and servicing.This proposal is intended to accommodate such temporary lighting string designs while maintaining thesame level of safety anticipated for meta

    14、l guards of temporary lighting strings employing Edison screwbase lampholders.The revision to 4.2.5.2.3 corrects a discrepancy between the stated minimum distance of 365.8 mm thatmust exist between convenience receptacles and the equivalent value of 12 ft. shown in parenthesis. Therequirement was in

    15、troduced in the 15th Edition of UL 48 to align with section 210.52(A)(1) of the NEC thatpermits up to 12 feet of space horizontally between receptacles along a floor line (i.e. 6 ft. in eitherdirection from a center point). However the stated value of 365.8 mm does not convert to 12 ft. Addingthe co

    16、rrect metric value of 3.66 m will correct this discrepancy.The revisions to 4.3.5.1.3 and 4.3.5.2.2 will fix the cross-reference paragraph numbers to point the correctmarkings for dedicated and convenience receptacles in section 7 of the standard.Copyright 2018 UL LLCUL LLC, in performing its functi

    17、ons in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of UL LLC. in practically applying therequirements of the s

    18、tandard. They do not represent formal interpretations of the standard underAmerican National Standards Institute (ANSI) processes. UL LLC shall not be responsible to anyone forthe use of or reliance upon Certification Requirement Decisions by anyone. UL LLC shall not incur anyobligation or liability

    19、 for damages, including consequential damages, arising out of or in connection withthe use or reliance upon Certification Requirement Decisions. The electronic version of the CertificationRequirement Decision is the current version and previously printed copies may be outdated.This document is published as a service to ULs certification customersSTANDARD NUMBER: UL 1088 -2-


    注意事项

    本文(UL 1088 CRD-2018 UL Standard for Safety Temporary Lighting Strings - Section Paragraph Reference 18 1 4 Subject Metallic Lamp Guards that are Unlikely to Become Energized (Edition.pdf)为本站会员(sofeeling205)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