UL SUBJECT 1724-2006 Outline of Investigation for Fire Tests for Electrical Circuit Protective Systems (Issue 3)《电路保护系统火灾试验调查大纲 发布编号 3》.pdf
《UL SUBJECT 1724-2006 Outline of Investigation for Fire Tests for Electrical Circuit Protective Systems (Issue 3)《电路保护系统火灾试验调查大纲 发布编号 3》.pdf》由会员分享,可在线阅读,更多相关《UL SUBJECT 1724-2006 Outline of Investigation for Fire Tests for Electrical Circuit Protective Systems (Issue 3)《电路保护系统火灾试验调查大纲 发布编号 3》.pdf(34页珍藏版)》请在麦多课文档分享上搜索。
1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDecember 7, 20061SUBJECT 1724OUTLINE OF INVESTIGATIONFORFIRE TESTS FOR ELECTRICAL CIRCUIT PROTECTIVE SYSTEMSIssue Number: 3December 7, 2006Summary of TopicsThis new issue of SU 1724 is being issu
2、ed through ULs electronicpublishing system to ensure format uniformity between the PDF andHTML versions of the document. No substantive changes have beenincorporated in the document.The UL Foreword is no longer located within the UL Standard. For informationconcerning the use and application of the
3、requirements contained in thisStandard, the current version of the UL Foreword is located onULStandardsInfoNet at: http:/ 2006 UNDERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULDECEMBER 7, 2006SUBJECT 17242No Text o
4、n This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION .6GENERAL1 Scope .72 Glossary .83 Units of Measurement .9PERFORMANCE4 External Fire Exposure Test 94.1 Test sample .94.2 Conditioning 104.3 Protection of assembly
5、and sample 104.4 Furnace temperature control and measurement .104.5 Furnace thermocouple preparation 114.6 Sample temperature measurement 124.7 Electrical circuit integrity 134.8 Differential pressure measurements .134.9 Duration of test 155 Hose Stream Test .156 Internal Fire Exposure Test .166.1 T
6、est sample 166.2 Conditioning 186.3 Protection of sample .186.4 Ignition flame source .196.5 Flame penetration indicator .206.6 Sample temperature measurement 206.7 Duration of test 21CONDITIONS OF ACCEPTANCE7 General .217.1 External fire exposure 217.2 Internal fire exposure 217.3 Correction Extern
7、al fire exposure test 21REPORT8 Results .229 Application of Results 23DECEMBER 7, 2006 SUBJECT 1724 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAPPENDIX A STANDARD TIME-TEMPERATURE CURVE FOR CONTROL OF FIRE TESTSAPPENDIX B QUALIFICATION T
8、EST FOR CIRCUIT INTEGRITY OF INSULATED ELECTRICALWIRES AND CABLES IN ELECTRICAL CIRCUIT PROTECTION SYSTEMSB1 General .B1B2 Test Sample .B1B3 Apparatus .B1B3.1 Raceway .B1B3.2 Air oven B3B3.3 Air oven/sample temperature control .B4B3.4 Compression loading .B4B3.5 Electrical circuit integrity B4B3.6 I
9、mpact force .B5B4 Test Method .B6B4.1 Preparation of test sample B6B4.2 Choice of temperature end point .B6B4.3 Elevated temperature exposure B6B4.4 Impact force .B7B5 Results B7DECEMBER 7, 2006SUBJECT 17244UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMIS
10、SION FROM ULDECEMBER 7, 2006 SUBJECT 1724 5No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTIONOn February 19, 1981, a new FIRE PROTECTION PROGRAM FOR OPERATING NUCLEAR POWERPLANTS (Appendix R to 10 CFR 50) became e
11、ffective. This action was taken to upgrade fire protectionat nuclear power plants licensed to operate prior to January 1, 1979.One section of Appendix R deals with the specification of certain methods to protect redundant safetytrains. One of the specified methods in Appendix R requires the Enclosur
12、e of cable and equipment andassociated nonsafety circuits of one redundant train in a fire barrier having a 1 hour rating.In addition to the protection of redundant safety trains in nuclear power plants, some municipalities haveadopted requirements that, in all buildings where an emergency generator
13、 is installed for protection oflife-safety, the feeder conductors from the generator to the emergency panel and any feeders required tooperate an elevator shall be protected by a 2 hour enclosure.The requirement for protection of vital electrical circuits during exposure to an external fire has prom
14、ptedthe development of fire resistive enclosures or coatings, identified as electrical circuit protection systems.An electrical circuit protective system consists of materials or protective coatings installed around, orapplied to, electrical conductors, cable trays, busways, cablebus, conduits, junc
15、tion boxes and otherelectrical conductor raceways. Electrical circuit protective systems are classified with respect to theirability to maintain the integrity of electrical circuits during a standardized exposure to an external fire.Several factors influence the ability of an electrical circuit prot
16、ective system to maintain the integrity ofelectrical circuits under fire exposure conditions. Factors such as the electrical conductor raceway typeand size and the severity of the standardized fire exposure to which the electrical circuit protective systemis exposed may be specified by the test proc
17、edure. Other factors such as the electrical conductorinsulation type, the electrical conductor size and construction type, the percentage of electrical conductorfill within the raceway and the temperature of the electrical conductors within the electrical circuitprotective system during normal opera
18、tion are variables which must be assessed for each application.This Outline of Proposed Investigation describes a standard test method to develop the data necessaryfor classifying electrical circuit protective systems for specific applications.DECEMBER 7, 2006SUBJECT 17246UL COPYRIGHTED MATERIAL NOT
19、 AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULGENERAL1 Scope1.1 These requirements cover the fire test investigation of electrical circuit protective systems of variousmaterials and construction.1.2 Under these requirements, samples of electrical circuit protective sy
20、stems are exposed to an externalfire for a predetermined time, and then to an application of a water hose stream. The followingmeasurements and determinations are made during the fire exposure and water hose stream tests:a) Measurement of temperature changes within the electrical circuit protective
21、system causedby the heat transfer through the electrical circuit protective system to the electrical conductor orraceway, or both, during the external fire exposure test.b) Determination of the integrity of the electrical circuit protective system during the external fireexposure and water hose stre
22、am test.c) Determination of the ability of insulated electrical conductors to maintain electrical circuitintegrity at the temperature conditions present within the electrical circuit protective systemduring the external fire exposure test and during the water hose stream test.1.3 The external fire e
23、xposure and water hose stream test may be cited as the Standard Fire Test, andthe performance is expressed in terms of maximum temperature rise within the electrical circuit protectivesystem at various increments of fire exposure time.1.4 The external fire exposure and water hose stream tests may no
24、t be representative of all fireconditions; conditions may vary with changes in the amount, nature, and distribution of fire loading,ventilation, compartment size an configuration, and heat conducting and dissipating characteristics of thecompartment in which the electrical circuit protective system
- 1.请仔细阅读文档,确保文档完整性,对于不预览、不比对内容而直接下载带来的问题本站不予受理。
- 2.下载的文档,不会出现我们的网址水印。
- 3、该文档所得收入(下载+内容+预览)归上传者、原创作者;如果您是本文档原作者,请点此认领!既往收益都归您。
下载文档到电脑,查找使用更方便
10000 积分 0人已下载
下载 | 加入VIP,交流精品资源 |
- 配套讲稿:
如PPT文件的首页显示word图标,表示该PPT已包含配套word讲稿。双击word图标可打开word文档。
- 特殊限制:
部分文档作品中含有的国旗、国徽等图片,仅作为作品整体效果示例展示,禁止商用。设计者仅对作品中独创性部分享有著作权。
- 关 键 词:
- ULSUBJECT17242006OUTLINEOFINVESTIGATIONFORFIRETESTSFORELECTRICALCIRCUITPROTECTIVESYSTEMSISSUE3 电路 保护

链接地址:http://www.mydoc123.com/p-1069191.html