1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNovember 21, 20061SUBJECT 299AOUTLINE OF INVESTIGATIONFORPORTABLE DRY CHEMICAL EXTINGUISHING SYSTEM UNITSIssue Number: 3NOVEMBER 21, 2006Summary of TopicsThis new issue of SU 299A is being issued
2、 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 re
3、quirements 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 ULNOVEMBER 21, 2006SUBJECT 299A2No Text on
4、 This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .4CONSTRUCTION2 Assembly 4PERFORMANCE3 Fire Test Portable Extinguisher Rating .44 Fire Test Total Flooding Evaluation 45 Response Test Of Heat Actuating Devi
5、ce 56 Operating Temperature Test .5NOVEMBER 21, 2006 SUBJECT 299A 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 These requirements are intended to supplement the Standard for Dry Chemical Fire Extinguishers,UL 299, fo
6、r Portable Dry Chemical Fire Extinguishing System Units provided with a heat responsiveautomatic means of actuation. These devices are also to be manually operated as a portable dry chemicalfire extinguisher.CONSTRUCTION2 Assembly2.1 Portable dry chemical extinguishing system units are to be provide
7、d with both an automatic means ofoperation when exposed to an abnormal rise in the enclosure ambient temperature and a manual meansof operation when the unit is to be used as a portable fire extinguisher.PERFORMANCE3 Fire Test Portable Extinguisher Rating3.1 Portable dry chemical extinguishing syste
8、m units shall be fire tested and rated in accordance with theStandard for the Rating and Fire Testing of Fire Extinguishers, UL 711, when manually operated as aportable fire extinguisher. Units obtaining not more than 10 lb of dry chemical extinguishing agent may beprovided with a fixed discharge no
9、zzle in lieu of a discharge hose assembly.4 Fire Test Total Flooding Evaluation4.1 Portable dry chemical extinguishing system units shall totally flood an enclosure and extinguish thetest fires in accordance with the requirements of Pars. 4.2 through 4.5 after the unit is conditioned at itsspecified
10、 minimum storage temperature for a period of at least 16 h.4.2 An enclosure is to be constructed having the maximum dimensions and volume specified for theportable extinguishing system unit.4.3 Fire tests incorporating wood cribs, shredded paper, excelsior or heptane, or combinations thereofare to b
11、e conducted as follows:a) 1-A wood crib centered in the enclosureb) 1-A wood crib offset in the enclosurec) 3.5 lb of shredded paper centered and a 2.5 ft2pan of heptane offset in the enclosured) 3.5 lb of shredded paper offset and a 2.5 ft2pan of heptane centered in the enclosuree) 4 lb of excelsio
12、r centered and a 2.5 ft2pan of heptane offset in the enclosuref) 4 lb of excelsior offset and a 2.5 ft2pan of heptane centered in the enclosureg) 2.5 ft2pan of heptane centered in the enclosureh) 2.5 ft2pan of heptane offset in the enclosureNOVEMBER 21, 2006SUBJECT 299A4UL COPYRIGHTED MATERIAL NOT A
13、UTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4.4 The 1A wood crib is to be constructed as described in the Standard for the Rating and Fire Testingof Fire Extinguishers, UL 711. Specifications for excelsior, heptane and the 2.5 ft2test pan are alsocontained in UL 711.
14、The term center means the center of the floor of the enclosure. The term offsetmeans the midpoint between the center of the room and one corner.4.5 During each fire test, cylindrical containers having dimensions of 3 in. ID and 4 in. high containing 2in. of heptane are to be located 2 in. from the c
15、orners of test enclosures and located vertically 12 in. belowthe ceiling of the enclosure. The heptane in the these cylinders is to be ignited after which the other testfuels (Par. 4.3) are to be ignited.5 Response Test Of Heat Actuating Device5.1 A portable type extinguishing system unit shall exti
16、nguish the heptane fire specified in Par. 5.2 within2 min after the test fuel is ignition.5.2 The heptane is to be contained in 2-1/2 ft2(0.23 m2) square pan located within 2 in. (50.8 mm) of acorner of the test enclosure described in Sec. 4.5.3 The test enclosure is to have two wall openings having
17、 an area of 1 ft2each to provide combustionair.6 Operating Temperature Test6.1 When subjected to the path test described in Pars. 6.2 through 6.7, heat responsive element shalloperate within a range of3-1/2 percent of the elements marked temperature rating.6.2 Ten heat responsive elements are to be
18、subjected to this test and each sample shall comply with therequirements of Par. 6.1.6.3 The heat responsive elements are to be placed in an upright position under a load equal to the unitsdesign operating load and completely immersed in a liquid bath. The water vessel is to be provided witha source
19、 for heating the liquid at the prescribed rate with the means to agitate the liquid and measure thetemperature of the liquid bath.6.4 Water is to be used for heat responsive elements having temperature ratings of 175F are to be bathtested in an oil having a flash point exceeding the elements rated t
20、emperature.6.5 An agitator is to be used for obtaining uniformity and temperature of the bath liquid.6.6 A laboratory mercury thermometer, calibrated in accordance with the specifications for ASTMthermometers, ASTM E186, is to be used to determine temperatures of the liquids used in bath tests. Theb
21、ulb of a thermometer is to be located level with the heat responsive element.6.7 The temperature of the bath liquid is to be raised until the liquid is within 20F (11C) of thetemperature of the heat responsive element for temperature rating of 300F or less and within 30F (17C)for an element having a
22、 temperature rating of 325F (163C) and higher. The rate of temperature rise isto be controlled at a rate not exceeding 1F (0.5C) per minute until operation or until a temperature 20F(11C) above the rated temperature is reached. The temperature of the liquid and the time of operation,as each heat responsive element operates, are to be recorded.NOVEMBER 21, 2006 SUBJECT 299A 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULNOVEMBER 21, 2006SUBJECT 299A6No Text on This Page
