1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 29, 20141UL 2882Outline of Investigation for Radio Head CableIssue Number: 1October 29, 2014Summary of TopicsThis first issue of the Outline of Investigation for Radio Head Cable, UL2882,
2、 covers multiple-conductor, 18 4 AWG sunlight resistant, 60, 90,150, 300 or 600 V radio head cable rated 60, 75, or 90C dry, and 60, 75, or90C wet for supplying power, data, and signal from a base station toremote radio heads on a tower or rooftop.ULs Outlines of Investigation are copyrighted by UL.
3、 Neither a printed norelectronic copy of an Outline of Investigation should be altered in any way. All ofULs Outlines of Investigation and all copyrights, ownerships, and rights regardingthose Outlines of Investigation shall remain the sole and exclusive property of UL.COPYRIGHT 2014 UNDERWRITERS LA
4、BORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULOCTOBER 29, 2014UL 28822No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUCTION1 Scope .42
5、 Units of Measurement .43 Undated References 4CONSTRUCTION4 Material .45 Conductors 45.1 General .45.2 Size and construction .56 Insulation and Jacket 57 Assembly 67.1 Optical-fiber member(s) and circuit conductors .67.2 Fillers .87.3 Binders 87.4 Shield(s) .97.5 Covering under armor .97.6 Armor .12
6、7.7 Overall jacket .12PERFORMANCE8 General .148.1 Cable not employing an armor 148.2 Cable employing an armor 149 Manufacturing and Production Tests .14MARKINGS10 General 1411 Tag, Reel or Carton Markings 1512 Responsibility for the Insulated Conductors 1612.1 No identification needed 1612.2 Only fa
7、ctory identification needed 1612.3 Organization and factory identification needed .16OCTOBER 29, 2014 UL 2882 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope1.1 This Outline covers insulated multiple-conductor, 18 4 AWG su
8、nlight resistant, 60, 90, 150, 300 or600 V radio head cable rated 60, 75, or 90C dry, and 60, 75, or 90C wet for supplying power, data, andsignal from a base station to remote radio heads on a tower or rooftop.2 Units of Measurement2.1 Values stated without parentheses are the requirement. Values in
9、 parentheses are explanatory orapproximate information.3 Undated References3.1 Any undated reference to a code or standard appearing in the requirements of this standard shall beinterpreted as referring to the latest edition of that code or standard.CONSTRUCTION4 Material4.1 In addition to being sta
10、ted in the inch/pound units that are customary in the USA, each of therequirements in this outline are also stated in units that make the requirement conveniently useable incountries employing the various metric systems (practical SI and customary). Equivalent although, notnecessarily exactly identi
11、cal results are to be expected from applying a requirement in USA or metricterms. Equipment calibrated in metric units is to be used when a requirement is applied in metric terms.4.2 Only materials that meet the intent of the requirement for the particular use shall be employed in awire. Wires shall
12、 be made and finished with the degree of uniformity and grade of workmanship that arepracticable in a well-equipped factory.4.3 Each material used in a wire shall be compatible with all of the other materials used in the wire.5 Conductors5.1 General5.1.1 Only stranded conductors of tinned or uncoate
13、d copper shall be used in a cable. Individualconductor strands shall consist of materials complying with the Standard Specification for Soft orAnnealed Copper Wire, ASTM B3 or the Standard Specification for Tin-Coated Soft or Annealed CopperWire for Electrical Purposes, ASTM B33.OCTOBER 29, 2014UL 2
14、8824UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.2 Size and construction5.2.1 A conductor shall not be smaller than 18 AWG and shall not be larger than 4 AWG. Conductorsshall comply with the following standards:a) Standard Specification f
15、or Concentric-Lay-Stranded Copper Conductors, Hard, Medium-Hard, or Soft, ASTM B8,b) Standard Specification for Rope-Lay-Stranded Copper Conductors Having Bunch-StrandedMembers, for Electrical Conductors, ASTM B172; orc) Standard Specification for Rope-Lay-Stranded Copper Conductors Having Concentri
16、c-Stranded Members, for Electrical Conductors, ASTM B173.d) Standard Specification for Bunch-Stranded Copper Conductors for Electrical Conductors,ASTM B 174; ore) Standard Specification for 19 Wire Combination Unilay-Stranded Copper Conductors forSubsequent Insulation, ASTM B787.5.2.2 An 18 or 16 AW
17、G copper conductor shall comply with the requirements for stranded fixture wireconductors in the Standard for Fixture Wire, UL 66. All other conductors shall comply with therequirements in the Standard for Thermoplastic-Insulated Wires and Cables, UL 83. Alternatively, aninsulated conductor pair may
18、 consist of an individually insulated conductor with an additional insulated,concentrically, helically distributed conductor over the inner conductor insulation. The length of lay ofstrands of this helically distributed conductor shall not exceed 17.5 times the diameter measured over theconcentric c
19、onductor. A longer length of lay shall be allowed provided the tag is marked as shown in11.1(l).5.2.3 The direct-current resistance of every conductor including any concentric conductor shall complywith the requirements in the Standard for Thermoplastic-Insulated Wires and Cables, UL 83 except thatt
20、he direct-current resistance of an 18 or 16 AWG conductor shall comply with the requirements in theStandard for Machine-Tool Wires and Cables, UL 1063.6 Insulation and Jacket6.1 Cable rated 90C The insulation and individual nylon jacket shall comply with the thickness andother requirements for Type
21、THW-2, THHW, THWN-2 or THHN/THWN as specified in the Standard forThermoplastic-Insulated Wires and Cables, UL 83. An 18 or 16 AWG conductor has the same thicknessas a 14 AWG.6.2 Cable rated 75C The insulation and individual jacket shall comply with the thickness and otherrequirements for Type THW, T
22、HWN, THW-2, THHW, THWN-2, or THHN/THWN as specified in theStandard for Thermoplastic-Insulated Wires and Cables, UL 83. An 18 or 16 AWG conductor has thesame thickness as a 14 AWG.OCTOBER 29, 2014 UL 2882 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISS
23、ION FROM UL6.3 Cable rated 60C The insulation and individual jacket shall comply with the thickness and otherrequirements for Type TW, THW, THWN, THW-2, THHW, THWN-2, or THHN/THWN, as specified in theStandard for Thermoplastic-Insulated Wires and Cables, UL 83. An 18 or 16 AWG conductor has thesame
24、thickness as a 14 AWG.6.4 An insulation or jacket that is of a material generically different from those specified for Type TW,THW, THWN, THW-2, THHW, THWN-2, or THHN/THWN (new material), or that is a material specified forTW, THW, THWN, THW-2, THHW, THWN-2, or THHN/THWN but that does not comply wit
25、h the thicknessor short-term physical properties tests for Type TW, THW, THWN, THW-2, THHW, THWN-2, orTHHN/THWN insulation or jacket, shall be evaluated for the requested temperature rating and/orthickness as described in the Dry temperature rating of new materials (long-term aging test), in theStan
26、dard for Wire and Cable Test Methods, UL 2556. Investigation of the electrical, mechanical, andphysical characteristics of the wire using the material shall show the material to be comparable inperformance to the TW, THW, THWN, THW-2, THHW, THWN-2, or THHN/THWN insulation or jacket. Theinvestigation
27、 shall include tests such as crushing, impact, abrasion, deformation, heat shock, insulationresistance, and dielectric voltage withstand.7 Assembly7.1 Optical-fiber member(s) and circuit conductors7.1.1 The conductors of the cable shall consist of individual single conductors, groups of singleconduc
28、tors or conductor pairs with each pair consisting of an individual insulated conductor over whichconcentrically, helically distributed conductor strands are applied. Each of the individual conductors orhelically distributed insulated pairs of conductors may employ a nylon jacket. Fiber optic members
29、, fillers,binders, one or more shields or armor may also be employed. An overall jacket is required only on cableswithout an armor.7.1.2 Optical-fiber member(s) alone shall not constitute a cable. One or more optical-fiber members maybe included in a round or flat cable. Optical-fiber members may be
30、 grouped with or without electricalconductors. Optical-fiber members in a cable shall be cabled alone or as a group with the same directionand with the same length of lay as the electrical conductors. In the performance of the cable, eachoptical-fiber member is to be considered as a filler. A group
31、of optical-fiber members without any electricalconductor(s) in it may include one or more non-current-carrying metal parts (earth-grounded or interruptedwhen the hybrid cable is installed) such as a metal strength element or a metal vapor barrier. Theconstruction of these parts is not specified.7.1.
32、3 All circuit conductors shall have the same voltage rating. Insulated conductors with differenttemperature ratings may be mixed in a given cable if the cable is rated for the lowest temperature ratingof any of the constituent insulated conductors.7.1.4 Two or more of the insulated conductors shall
33、be assembled in a cable. Sizes may be mixed. Acable may contain precabled groups of conductors as described in 7.1.6.7.1.5 In a cable with two, three, or four individual circuit conductors or one or two concentric pairs ofconductors, the conductors may be cabled or laid parallel (flat cable).OCTOBER
34、 29, 2014UL 28826UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.1.6 The insulated conductors in a round cable shall be cabled with a length of lay that is uniformthroughout the length of the cable and is not greater than indicated in Table
35、7.1. Grouping of the circuitconductors into pairs, triads, quads, and other precabled subassemblies is not required but is acceptableif the length of lay of the conductors in each group and of the groups in the overall assembly comply withthis requirement and with Table 7.1. The direction of lay may
36、 be changed at intervals throughout thelength of the cable. The intervals are not required to be uniform. In a cable in which the lay is reversedshall be in accordance with the following:a) Each area in which the lay is right- or left-hand for not less than five complete twists (full 360degree cycle
37、s) shall have the insulated conductors or precabled groups of insulated conductorscabled with a length of lay that is not greater than indicated in Table 7.1; andb) The length of each lay-transition zone (oscillated section) between these areas of right- andleft-hand lay shall not exceed 1.8 times t
38、he maximum length of lay indicated in Table 7.1. If thedirection of lay is not reversed in a cable containing layers of conductors or groups, thedirection of lay of successive layers is not specified but the outer layer shall have a left-hand layas defined in 7.1.7. If the direction of lay is not re
39、versed in a single-layer cable, the conductorsor groups shall have a left-hand lay. See 7.2 for fillers and 7.3 for binders.Table 7.1Length of lay of insulated conductors and precabled groupsaNumber of insulatedconductors in a cableMaximum acceptable length of lay2 4 30 times conductor diameterb5 or
40、 more 15 times the calculated diameter of the overallassembly but, in a multiple-layer cable, the length oflay of the conductors in each of the inner layers of thecable is not specified (governed by the construction ofthe cabling machine).aThe length of lay of each conductor in a group shall comply
41、with the tabulatedvalue as if the group were a cable. Likewise, the length of lay of each group in acable shall comply with the tabulated value as if each group was a conductor.b“Conductor diameter” is the calculated diameter of the largest individual finishedinsulated conductor in the cable.7.1.7 A
42、 left-hand lay is defined as a counterclockwise twist away from the observer.OCTOBER 29, 2014 UL 2882 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.2 Fillers7.2.1 Fillers shall be provided in a flat or round cable if the fillers are neede
43、d to make the finished cablefirm at all points. Fillers shall be provided in a cable that is intended to be round if they are needed to makethe finished cable round. In a round cable, fillers shall be cabled with the conductors or, if applicable tothe construction, may be in the center of the cable.
44、 Fillers may be integral with or separate from any binderjacket or the overall cable jacket. If fillers are integral with a jacket, they and the jacket shall be readilyseparable from the underlying cable assembly. Fillers shall be of nonconductive nonmetallic material.7.3 Binders7.3.1 The entire cab
45、le assembly, or any number of conductors (with or without one or more optical-fibermembers included in the group), or several such groups within the cable may be enclosed in a binderconsisting of a shield (see 7.4) or of a braid, tape, or other unspecified means. An individual group orseveral groups
46、 may be enclosed in a thin binder jacket that is of the same temperature rating as theoverall cable jacket. The thicknesses of a binder jacket (extruded binder) shall not be less than indicatedin Table 7.2 when measured as described in 7.3.2 and 7.3.3.Table 7.2Thickness of binder jacketCalculated di
47、ameter of round assembly underbinder jacket or calculated length of major axisof flat assembly under binder jacketMinimum average thickness Minimum thickness at any pointinch (mm) mils (mm) mils (mm)0 0.425 (0 10.80) 15 (0.38) 12 (0.30)Over 0.425 but not over0.700(Over 10.80 but not over17.78)30 (0.
48、76) 24 (0.61)Over 0.700 but not over1.500(Over 17.78 but not over38.10)45 (1.14) 36 (0.91)Over 1.500 but not over2.500(Over 38.10 but not over63.50)60 (1.52) 48 (1.22)7.3.2 The average thickness of the jacket is to be determined by the difference method, which is toconsist of determining the average
49、 diameter over the finished jacket, subtracting from it the diameter ofthe assembly under the jacket, and dividing the result by 2. The diameters over and under the jacket areto be determined by means of a diameter tape capable of making measurements to at least 0.01 inch or0.1 mm with estimates to 0.005 inch or 0.05 mm. The average thickness of the jacket is acceptable if thevalue determined from the diameter-tape measurements equals or exceeds the average indicated in thetable. If the average thickness determined from the diameter-tape measurements is l
