1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMay 10, 20061SUBJECT 2424OUTLINE OF INVESTIGATIONFORCABLE MARKED LIMITED COMBUSTIBLEIssue Number 3MAY 10, 2006Summary of TopicsThis revised outline is being issued to remove the foreword, to corr
2、ect thepotential heat value for copper, to clarify the performance requirementswith regard to the flame and smoke tests and to modify the tag markingrequirements.The UL Foreword is no longer located within the UL Outline of Investigation. Forinformation concerning the use and application of the requ
3、irements contained inthis Outline of Investigation, 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 ULMAY 10, 2006SUBJECT 24242N
4、o Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .4CONSTRUCTION2 Materials and Dimensions 4PERFORMANCE3 General 44 Limited Combustibility Tests 54.1 Potential Heat 54.2 Surface Burning Characterist
5、ics 6MARKINGS5 Information on or in the Cable 76 Information on the Tag, Reel, or Carton .7MAY 10, 2006 SUBJECT 2424 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 This Outline covers electrical and optical-fiber cable
6、s that comply with the surface-burning andheat-release requirements for limited-combustible material for use in ceiling-cavity and raised-floorplenums in accordance with the 2002 edition of the Standard for the Installation of Air-Conditioning andVentilating Systems, NFPA 90A. These cables also comp
7、ly with the requirements for cables in ducts,plenums, and other spaces used for environmental air in accordance with Articles 725, 760, 770, 800,820, and 830 of the National Electrical Code.CONSTRUCTION2 Materials and Dimensions2.1 These cables shall comply with the construction requirements in one
8、or more of the following productcategories:a) Power-Limited Circuit Cables, UL 13 Type CL2P or CL3Pb) Communications Cables, UL 444 Type CMPc) Cables for Power-Limited Fire-Alarm Circuits, UL 1424 Type FPLPd) Cables for Non-Power-Limited Fire-Alarm Circuits, UL 1425 Type NPLFPe) Community-Antenna Te
9、levision Cables, UL 1655 Type CATVPf) Outline of Investigation for Network-Powered Broadband Communication Cable, Subject 2261 Type BLPPERFORMANCE3 General3.1 These cables shall comply with the performance requirements in one or more of the productcategories shown below. These cables shall also comp
10、ly with the Potential Heat and Surface BurningCharacteristics Tests in Section 4.a) Power-Limited Circuit Cables, UL 13 Type CL2P or CL3Pb) Communications Cables, UL 444 Type CMPc) Cables for Power-Limited Fire-Alarm Circuits, UL 1424 Type FPLPd) Cables for Non-Power-Limited-Fire Alarm Circuits, UL
11、1425 Type NPLFPe) Optical Fiber Cable, UL 1651 Type OFNP or OFCPf) Community-Antenna Television Cables, UL 1655 Type CATVPg) Outline of Investigation for Network-Powered Broadband Communication Cable, Subject2261 Type BLPMAY 10, 2006SUBJECT 24244UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REP
12、RODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 Limited Combustibility Tests4.1 Potential Heat4.1.1 Cable shall have a maximum Potential Heat value of 3500 Btu/lb in NFPA 90A when tested inaccordance with the Standard Test Method for Potential Heat of Building Materials, NFPA 259 (2003).4.1.2 C
13、able shall be tested as described in this paragraph and in 4.1.3 and 4.1.4. The gross heat ofcombustion is to be determined by an oxygen-bomb calorimeter using the method described in theStandard Test Method for Gross Calorific Value of Coal and Coke, ASTM D 5865. All combustiblecomponents of the ca
14、ble construction, including, but not limited to the conductor insulation, fillers, bindersand the jacket, are to be separated from the conductors. The components are to be weighed, and theweight ratio of the components is to be calculated.4.1.3 The combustible components are to be pulverized to pass
15、 through a 60-mesh screen and thencombined at the determined weight ratio. The resulting specimens are to be weighed, combined with thebenzoic acid combustion promotor, and then ignited in the calorimeter. The Heat of Combustion is to becalculated from the temperature rise.4.1.4 The Potential Heat o
16、f the entire cable construction is to be calculated using the following equation:P = (% comb. x hcd)+(%condxhcr) / 100in which:P is the Potential Heat, Btu/lb,% comb. is the % by weight of combustible components in the finished cable,% cond. is the % by weight of conductor in the finished cable,hcdi
17、s the heat of combustion of combustible components, Btu/lb, andhcris the heat of combustion of conductor, Btu/lb (copper has been previouslydetermined to be 60 Btu/lb).MAY 10, 2006 SUBJECT 2424 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL
18、4.2 Surface Burning Characteristics4.2.1 Cables shall have a maximum smoke developed index of 50 and a maximum flame spread indexof 25 when tested in accordance with the Standard Test for Surface Burning Characteristics of BuildingMaterials, UL 723 (NFPA 255).4.2.2 The following tests shall be condu
19、cted in accordance with UL 723 (NFPA 255):a) One test following standard conditions.b) One test following standard conditions, with the jacket slit on 100 percent of the cablelengths.c) One to two additional tests on the worst-case condition of situation A or B.d) One to three tests on the cable fol
20、lowing accelerated aging in an air oven for 7 days at oneof the following temperatures depending upon the temperature rating of the cable beingsubmitted:Cable Temperature Rating (C) Aging Temperature (C)60 10075 11390 121105 136125 or higher 158Note: The samples subjected to the oven aging are to be
21、 conditioned for a minimum of 24 h at 23C 3(73F 5) and 50 5% RH after removal from the oven prior to testing.e) One to three tests on the cable following conditioning in a humidity chamber for seven daysat nominal 80% RH and 23C.f) One to three tests on the cable following conditioning in a humidity
22、 chamber for seven daysat nominal 15% RH and 23C.Note: The samples subjected to the humidity conditioning are to be tested within 30 minutes followingremoval from the humidity chamber.MAY 10, 2006SUBJECT 24246UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERM
23、ISSION FROM ULMARKINGS5 Information on or in the Cable5.1 The information required on or in the cable in the Standards or Outline of Investigation listed in 3.1shall appear throughout the entire cable. In addition, the following words, placed immediately before thecable Type designation (CMP, CL2P,
24、etc.), shall appear as part of the marking:Limited Combustible FHC 25/506 Information on the Tag, Reel, or Carton6.1 The information required on the tag, reel, or carton in the Standards or Outline of Investigation listedin 3.1 shall appear on the tag. In addition, the following words shall appear a
25、s part of the tag marking:a) Limited Combustible FHC 25/50 placed immediately before the cable Type designation(CMP, CL2P, etc.)b) This cable meets the limited combustible and smoke developed requirements for cablesinstalled in ceiling plenums and raised floor plenums in the Standard for the Installation of AirConditioning and Ventilating Systems, NFPA 90A.MAY 10, 2006 SUBJECT 2424 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULMAY 10, 2006SUBJECT 24248No Text on This Page
