UL SUBJECT 267-2008 Outline of Investigation for Wire-Pulling Compounds (Issue 3)《线缆拖拉用化合物调查大纲 发布编号 3》.pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULApril 21, 20081SUBJECT 267OUTLINE OF INVESTIGATIONFORWIRE-PULLING COMPOUNDSIssue Number: 3April 21, 2008Summary of TopicsThis new issue of the Outline for Wire-Pulling Compounds addressesmiscella

2、neous updates and clarifications to the test program.The UL Foreword is no longer located within the UL Standard. For informationconcerning the use and application of the requirements contained in thisStandard, the current version of the UL Foreword is located onULStandardsInfoNet at: http:/ 2008 UN

3、DERWRITERS LABORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULAPRIL 21, 2008SUBJECT 2672No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCONTENTSINTRODUC

4、TION1 Scope .5SAMPLES2 Compound .53 Wire .54 Electrical Metallic Tubing .6PERFORMANCE TESTS5 Introduction 66 Total Immersion of Wires 67 Extended Exposure of Wires in Conduit .68 Dielectric Breakdown Test .79 Tensile Strength and Elongation Tests .810 Corrosion Test .811 Optional Exposures 8CHARACTE

5、RIZATION TESTS12 Introduction .913 Determination of pH 914 Determination of Free Alkali .915 Determination of Fatty Acids 916 Determination of Petroleum Ether Extract 1017 Qualitative Infrared Analysis 1018 Determination of Percent Solids 1019 Determination of Weight Per Gallon .10APRIL 21, 2008 SUB

6、JECT 267 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis page intentionally left blank.APRIL 21, 2008SUBJECT 2674UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULINTRODUCTION1 Scope

7、1.1 This Outline describes tests for determining whether wire-pulling compounds corrode metal racewaysand whether they are compatible with the insulation and jacketing materials typically used in electricalwires and cables intended to be pulled into conduit and other raceways. These compounds are fo

8、rlubricating the wiring while it is being pulled in. In Sections 12 19, this Outline also describes analyticalmethods for characterizing a compound to provide a basis for identification and for comparison withproduction lots to reveal compositional changes.1.2 This Outline does not investigate other

9、 properties of wire-pulling compounds, such as solubility,flammability, and toxicity.SAMPLES2 Compound2.1 Approximately 2 gallons of the wire-pulling compound are needed for use in this test program. At leastone of the containers is to be a 1 quart size.3 Wire3.1 All four of the wires described in T

10、able 3.1 are to be used in this test program as representative ofthe insulated wires that are commonly pulled into conduit and other raceways. The wires are to be 14 or12 AWG in size.Table 3.1Test wiresWire RepresentingType TW PVCType THHN or Type THWN PVC insulation with a nylon jacketType XHHW XLT

11、ype RHW with a CP outer surfaceorType RHH with a CP outer surfaceCPAPRIL 21, 2008 SUBJECT 267 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL4 Electrical Metallic Tubing4.1 New (or like new), unused 1/2-inch EMT in both 10-ft and 9-in length

12、s are to be used in this testprogram as representative of the conduit and raceways into which insulated wires commonly are pulled.The EMT is to be zinc-coated on the inside surface.PERFORMANCE TESTS5 Introduction5.1 The performance tests described in 6.1 11.1 are to be conducted on samples of the wi

13、re-pullingcompound to evaluate compatibility of the compound with the conductor insulation and jackets that arecommonly used on wires and cables in conduit and other raceways.6 Total Immersion of Wires6.1 U-shaped specimens of each of the four wires specified in Table 3.1 are to be totally immersed

14、in thewire-pulling compound for 30 days at a room temperature of 25 10C (77 18F). The ends of each wirespecimen are to extend above the surface of the wire-pulling compound. Upon removal, the wirespecimens are to be wiped clean with a cloth and examined for changes in appearance. The wirespecimens a

15、re to be allowed to dry for 96 hours at a room temperature of 25 10C (77 18F) beforebeing tested for tensile strength and elongation as described in 9.1 and 9.2.7 Extended Exposure of Wires in Conduit7.1 Ten-foot lengths of each of the four wire types specified in Table 3.1 are to be pulled into ind

16、ividual10-ft lengths of 1/2-inch EMT using the wire-pulling compound as a lubricant in accordance with themanufacturers instructions. In addition, 10-ft lengths of each wire are to be pulled into 10-ft lengths of the1/2-inch EMT without using the wire-pulling compound or any other lubricant. Each of

17、 the EMT-and-wireassemblies is to be sealed at each end with a cork. The assemblies are to be stored in a horizontalposition at a temperature of 50.0 2.0C (122.0 3.6F). After 75 days, each cork is to be replaced withthe smallest plug of glass wool that will cover the opening. Protective gloves and a

18、 dust mask are to beworn while handling the glass wool. After an additional 105 days (180 days total exposure), the wiresamples are to be removed from the EMT and allowed to dry for 96 hours at a room temperature of 2510C (77 18F) before being tested as described in 8.1 9.2. See 11.1 regarding addit

19、ional exposureperiods of 30 and 90 days for optional voltage-withstand and tensile and elongation testing.APRIL 21, 2008SUBJECT 2676UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL8 Dielectric Breakdown Test8.1 The test described in 8.2 8.7 is

20、 to be conducted on each of the four wires specified in Table 3.1 inuntested (as-received) 4-ft lengths and in 4-ft lengths from the wires subjected to the exposure-in-conduittest described in 7.1. Wire pulling compound from the exposure-in-conduit test is to be removed from bareconductor ends by me

21、ans of a soft cloth before testing. See 11.1 for optional additional testing.8.2 The apparatus is to consist of a tank in which the wires are to be immersed in tap water, anearth-grounded electrode, a means such as a circuit breaker or lamp bank for indicating the flow ofbreakdown current in the tes

22、t circuit, and a transformer complying with the following. The test potential isto be supplied by a 48 62 Hz isolation transformer whose output potential is continuously variable fromnear zero to 50,000 V rms at a rate not exceeding 500 V/s. With a specimen in the circuit, the outputpotential is to

23、have a crest factor (peak voltage divided by rms voltage) equal to 95 105 percent of thecrest factor of a pure sine wave over the upper half of the output range. The output potential is to bemonitored continuously by a voltmeter. If of the analog rather than digital type, the voltmeter is to have ar

24、esponse time that does not introduce a lagging error greater than 1 percent of full scale at the specifiedrate of increase in voltage. The voltmeter is to have an overall accuracy that does not introduce an errorexceeding 5 percent. The water is to be at a room temperature of 25 10C (77 18F), with n

25、o correctionfactor applied.8.3 The wires are to be immersed and immediately tested one at a time. Both ends of each wire are toextend well above the surface of the water in the tank.8.4 One side of the test circuit is to be connected to the conductor in the wire and the other side to anelectrode tha

26、t is earth grounded and in contact with the water in the tank.8.5 The applied potential is to be increased from near zero at an essentially uniform rate of approximately500 V/s until breakdown occurs.8.6 Breakdown usually can be determined to have occurred by observing the current rush resulting fro

27、mthe decreased resistance in the circuit or by observing a flash at the point on the wire at which thebreakdown takes place.8.7 The voltage at which breakdown occurs for the wires from the exposure-in-conduit test described in7.1 and for wires freshly pulled through the 1/2-inch EMT using the compou

28、nd shall be at least 50 percentof the breakdown voltage of the untested wires.APRIL 21, 2008 SUBJECT 267 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL9 Tensile Strength and Elongation Tests9.1 The ultimate elongation and maximum tensile st

29、rength of the insulation are to be determined asdescribed in the Reference Standard for Electrical Wires, Cables, and Flexible Cords, UL 1581, using thefollowing specimens. Where CP is over other material on the conductor, tubular specimens of thecomposite construction are to be tested (the underlyi

30、ng material is not to be buffed away). See 11.1 foroptional additional testing.a) Specimens prepared from untested lengths of each of the four wires specified in Table 3.1,b) Specimens prepared from the wires that were subjected to the exposure-in-conduit testdescribed in 7.1, andc) Specimens prepar

31、ed from the wires that were subjected to the immersion-in-compound testdescribed in 6.1.9.2 The tensile and elongation values obtained from testing the exposure-in-conduit andimmersion-in-compound specimens are not to be less than 70 percent of the values obtained using theuntested specimens.10 Corr

32、osion Test10.1 Two 9-inch lengths of the 1/2-inch EMT are to be sealed at one end with a rubber stopper. One ofthe lengths is to be filled 3/4 full with the wire-pulling compound and the other is to be filled 3/4 full withtap water. A rubber stopper pierced with a short length of capillary tubing is

33、 to be fit into the upper end ofeach length of EMT. The lengths are to be supported in a vertical position at a room temperature of 2510C (77 18F) for 30 days and then are to be unstoppered, rinsed with tap water, and cut in halflengthwise. A soft cloth can be used to remove the wire pulling compoun

34、d from inside the filled tube aftercutting if necessary. The zinc-coated inside surface of the EMT is not to show any evidence of corrosion.11 Optional Exposures11.1 If requested by the manufacturer of the wire-pulling compound, the voltage-withstand testingdescribed in 8.1 8.7 and the tensile and e

35、longation tests described in 9.1 and 9.2 are to be conductedon samples of the wire exposed for 30 and 90 days in the exposure-in-conduit test described in 7.1. Thistesting is optional for the purpose of providing an advance indication of the effect of the compound on thewires prior to completion of

36、the full 180 days of the exposure-in-conduit test.APRIL 21, 2008SUBJECT 2678UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULCHARACTERIZATION TESTS12 Introduction12.1 Qualitative and quantitative analytical tests are to be conducted on samples

37、of the wire-pullingcompound to establish a characterization for general descriptive purposes and to provide a comparativebaseline for revealing compositional changes in production lots of the compound. The tests described in13.1 16.1 are conducted for descriptive purposes. The tests described in 17.

38、1 19.1 are conducted forcomparative purposes. Other characterization tests appropriate for a particular compound compositionmay supplement or replace those described below.13 Determination of pH13.1 The pH of the wire-pulling compound is to be determined using a calibrated pH meter. The pH ofthe wir

39、e-pulling compound is not specified. However, the product may be described as a neutralcompound only if the tested pH is above 5.0 and below 9.0.14 Determination of Free Alkali14.1 A 10-gram sample of the wire-pulling compound is to be digested in 200 ml of ethyl alcohol on asteam bath until the dig

40、estion appears to be complete. The solution is then to be titrated with 1.0 N sodiumhydroxide using phenolphthalein as an indicator to determine the amount of free alkali in the sample. Thefree alkali content of the wire-pulling compound is not specified. However, the compound may bedescribed as pra

41、ctically free of uncombined free alkali only if the tested free alkali content is less than5 percent.15 Determination of Fatty Acids15.1 A 5-gram sample of the wire-pulling compound is to be dissolved in approximately 10 ml of hotdistilled water. An excess of dilute sulfuric acid is to be added. The

42、 resulting solution is to be heated ona steam bath until the fatty acids float to the top. Paraffin weighing 10 grams is then to be added and theresulting mixture heated on a steam bath until a clean, oily layer forms at the top. The mixture is then tobe cooled, thoroughly chilled, and the solid lay

43、er of paraffin and fatty acids removed to filter paper, driedover calcium chloride in a desiccator, and weighed. The gain in weight of the paraffin is to be taken as theweight of fatty acids in the sample. The fatty acid content of the wire-pulling compound is not specified.However, the compound may

44、 be described as practically free of fatty acid only if the tested fatty acidcontent is less than 5 percent.APRIL 21, 2008 SUBJECT 267 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL16 Determination of Petroleum Ether Extract16.1 A 10-gram s

45、ample of the wire-pulling compound is to be extracted to apparent completion withpetroleum ether in an alundum thimble. The solvent is to be evaporated from the solution and the sampledried for 2 hours in a 70C oven. The gain in weight is to be taken as the amount of mineral oil in thesample. The mi

46、neral oil content of the wire-pulling compound is not specified. However, the compoundmay be described as practically free of mineral oil only if the tested mineral oil content is less than 5percent.17 Qualitative Infrared Analysis17.1 A qualitative infrared analysis spectrum of the wire-pulling com

47、pound is to be generated asdescribed in the Standard for Polymeric Materials Short Term Property Evaluations, UL 746A.18 Determination of Percent Solids18.1 A percent solids test of the wire-pulling compound is to be performed as described in the Standardfor Organic Coatings for Steel Enclosures for

48、 Outdoor-Use Electrical Equipment, UL 1332.19 Determination of Weight Per Gallon19.1 A weight per gallon test of the wire-pulling compound is to be performed as described in theStandard for Organic Coatings for Steel Enclosures for Outdoor-Use Electrical Equipment, UL 1332.APRIL 21, 2008SUBJECT 26710