1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULUNDERWRITERS LABORATORIES INC. CERTIFICATION REQUIREMENT DECISIONThis Certification Requirement Decision is prepared and published by Underwriters Laboratories Inc.(UL). It is normative for the a
2、pplicable UL Product Certification Program(s); however, it is currently notpart of the UL Standard(s) referenced below.Product Category (CCN): DWTTStandard Number: UL 651Standard Title: Standard for Schedule 40, 80, Type EB and A Rigid PVC Conduit andFittingsEdition Date: October 25, 2011Edition Num
3、ber: 8Section / Paragraph Reference: Paragraphs 1.1.1, 1.2.5, 5.1.1, 5.4. 5.4.1, 5.4.1.1,5.4.1.2, 5.4.1.3, 5.4.2, 5.4.3 and 9.2.4; Sections 7.4 and 7.5; Table 7.4; Figure 7.6Subject: Nonmetallic Expansion-Deflection FittingsDECISION:1.1.1 These requirements cover Schedule 40, Schedule 80, Type EB an
4、d Type A extruded rigid PVC(polyvinyl chloride) electrical conduit and fittings. These requirements also cover elbows, couplings,adapters, expansion, expansion-deflection, or deflection joints, and similar fittings that are constructed atleast in part of rigid PVC. The designations Schedule 40, Sche
5、dule 80, Type EB, Type A refer toUSA trade sizes of conduit having iron pipe-size outside diameters and specific wall thicknesses.Couplings, adapters, expansion, expansion-deflection, or deflection joints, and similar fittings are intendedto be used with Schedule 40, Schedule 80, Type EB and Type A
6、rigid PVC conduit, and elbows, inaccordance with the National Electrical Code (NEC), NFPA 70.1.2.5 The expansion joints covered by these requirements are fittings intended to compensate for linearthermal expansion of a span of Schedule 40 and Schedule 80 rigid PVC) conduit.5.1.1 A rigid PVC conduit
7、fitting shall be constructed of an unplasticized polyvinyl chloride material, withor without components made of other materials, that has been determined to be acceptable for theapplication.5.4 Expansion, expansion-deflection, or deflection joints5.4.1 An expansion joint shall be capable of being co
8、nnected to rigid PVC conduit or a coupling at bothends by means of a solvent type cement. An expansion joint is intended to compensate only for linearthermal expansion of a span of rigid PVC conduit.5.4.1.1 An expansion-deflection joint is intended to compensate for linear expansion and compensate f
9、orlateral or angular deflection in a span of rigid PVC conduit.5.4.1.2 A deflection joint intends to compensate only for lateral or angular deflection in a span of rigid PVCconduit.5.4.1.3 An expansion, expansion-deflection or deflection joint shall be capable of being connected to rigidPVC conduit
10、or a coupling at both ends by means of a solvent type cement.5.4.2 Unless an expansion joint, which allows movement between the joint and adjacent conduit lengthsis fastened at one end to rigid PVC conduit, a stop shall be provided to prevent the movable member ofthe joint from exposing either of th
11、e cut ends of the conduit lengths to which the joint is connected.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL5.4.3 The inside end or ends of rigid PVC conduit and the joint at their interface of an expansion joint,regardless of the adjust
12、ment position, shall be free of any snags that would impede fish tape or wires frombeing passed through the joint. The ends shall be beveled to remove any existing snags.7.4 Expansion, expansion-deflection, or deflection joints7.4.1 General7.4.1.1 An expansion, expansion-deflection, or deflection jo
13、int shall be assembled to conduit inaccordance with 7.4.1.7. The expansion, expansion-deflection, or deflection joint shall then be subjectedto the test sequence as appropriate for the type joint specified in Table 7.4.Table 7.4Expansion, expansion-deflection, or deflection joint test sequenceExpans
14、ion joints Expansion-deflection or deflection jointsAssembly (7.4.1.7 and 7.4.2.1) Assembly (7.4.1.7 and 7.4.2.1)Reciprocation test (7.4.3) Reciprocation test (7.4.3) Deflection test (7.4.4)Wet locations test (outdoor or wetlocations joints only, 7.3.2)Wet locations test (outdoor or wetlocations joi
15、nts only, 7.3.2)Wet locations test (outdoor or wetlocations joints only, 7.3.2)7.4.1.2 At the request of the manufacturer, the range of each full cycle of reciprocation in 7.4.3 for anexpansion-deflection joint may be increased to correspond with the declared deflection range of the joint.See 7.4.1.
16、5.7.4.1.3 An expansion-deflection joint having a declared deflection range that exceeds the range of a fullcycle of reciprocations as described in 7.4.3.2 shall be subjected to the Deflection test in 7.4.4.7.4.1.4 An expansion-deflection joint having a declared deflection limit of 3/4 in. (19.1 mm)
17、or less andtested as described in 7.4.3.2 shall not be required to be subjected to the Deflection test in 7.4.4.7.4.1.5 An expansion-deflection joint having a declared deflection limit greater than 3/4 in. (19.1 mm) shallnot be required to be subjected to the Deflection test when the range of each f
18、ull reciprocation cycle forconducting the Reciprocation test in 7.4.3.2 is increased to correspond to the maximum declareddeflection limit as permitted in 7.4.1.2.7.4.1.6 A deflection joint shall be subjected to the test in 7.4.4.7.4.1.7 For the tests in Table 7.4, a set of expansion, expansion-defl
19、ection, or deflection joints shallconsist of six samples each of the smallest, the largest, and one intermediate trade size in a line of joints,and any additional trade size that employs a construction or feature unique to that trade size.7.4.1.8 With the exception of the low-temperature handling te
20、st in 7.2.7, the tests in 7.2 shall be conductedonly on the PVC components of expansion, expansion-deflection or deflection joints. The bending test in7.2.8 and the pull test in 7.2.9 are not applicable for such joints.7.4.1.9 A component of the body of an expansion-deflection, or deflection joint c
21、onstructed of anelastomeric material shall be separately evaluated according to the requirements in 7.5.7.4.2 Assembly testSTANDARD NUMBER: UL 651 -2-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.4.2.1 For all lines of expansion, expansion
22、-deflection, or deflection joints, one set of joints shall beassembled in the intended manner to PVC conduit having the dimensions specified in Tables 4.1 and 4.2.7.4.3 Reciprocation test7.4.3.1 An expansion or expansion-deflection joint shall be conditioned as described in 7.4.3.2.7.4.3.2 Each expa
23、nsion or expansion-deflection joint assembled to rigid PVC conduit as required by7.4.1.7 and 7.4.2.1 shall be subjected to 500 cycles of reciprocation. One cycle of reciprocation shallconsist of a 3/4 in (19.1 mm) insertion of the conduit into the joint, followed by withdrawal of the conduitfrom the
24、 joint to its original position. The speed of insertion and withdrawal shall not exceed 0.50 in (12.7mm) per minute. Following the test, the samples shall be inspected and there shall be no signs of damagethat would indicate that the product could not perform its intended function. In case of doubt,
25、 a separateset of samples shall be subjected to the test.7.4.3.3 An expansion, expansion-deflection or deflection joint intended for use outdoors or in a wetlocation shall be subjected to the wet locations test in 7.3.2 following the reciprocation conditioning.7.4.4 Deflection test7.4.4.1 Each expan
26、sion-deflection or deflection joint assembled to rigid PVC conduit as required by7.4.1.5 and 7.4.2.1 shall be subjected to 500 cycles of deflection. The deflection shall consist of themovement of one end of the joint through a parallel misalignment along the plane of the longitudinal axisof the join
27、t to the maximum amount of deflection declared by the manufacturer. One cycle shall consist ofthis movement in one direction through the center point, then in the other direction. See Figure 7.6.Following the test, the samples shall be inspected and there shall be no signs of damage that wouldindica
28、te that the product could not perform its intended function. In case of doubt, a separate set ofsamples shall be subjected to the test.7.4.4.2 An expansion-deflection or deflection joint intended for use outdoors or in a wet location shall besubjected to the wet locations test in 7.3.2 following the
29、 deflection conditioning.This is generated text for figtxt.STANDARD NUMBER: UL 651 -3-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM UL7.4.5 Ferrous metal components7.4.5.1 Three samples each of the smallest, intermediate and largest size ferro
30、us metal components ofan expansion, expansion-deflection or deflection joint shall comply with the requirements for coatings onmetallic surfaces according to the Standard for Conduit, Tubing, and Cable Fittings, UL 514B.7.4.5.2 The protective coating on screws and components of cast or malleable iro
31、n is not measured ortested. Evidence of corrosion protection provided shall be verified by visual inspection.7.5 Evaluation of Elastomeric Materials7.5.1 General7.5.1.1 Components of the body of an expansion-deflection or deflection joint constructed of anelastomeric material shall comply with the r
32、equirements in 7.5.2 - 7.5.4.7.5.2 Vertical burning flame test7.5.2.1 Specimen flame bars of the material shall be subjected to the Vertical Burning Test (section 8) inthe Standard for Tests for Flammability of Plastic Materials for Parts in Devices and Appliances, UL 94.Ten specimens shall be teste
33、d in the as-received condition and 10 samples shall be tested after 70Cwater absorption conditioning according to the Water Exposure and Immersion tests (section 26 and 58)in the Standard for Polymeric Materials - Use in Electrical Equipment Evaluations, UL 746C. Tenadditional samples of specimens f
34、or a joint intended for use outdoors or in wet locations shall be testedFigure 7.6DeflectionSTANDARD NUMBER: UL 651 -4-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULfollowing exposure to xenon-arc ultraviolet light and water for 1000 hours a
35、ccording to the Ultraviolet LightExposure Test (section 57) in UL 746C. The flame bar specimens shall have dimensions of 0.5 in. by 5.0in. (12.7 mm by 127 mm) and be of a thickness representing the minimum thickness of the product.7.5.3 Tensile strength and elongation test7.5.3.1 Plaque specimens of
36、 material shall be subjected to the tensile strength and elongation testaccording to the Standard for Polymeric Materials - Use in Electrical Equipment Evaluations, UL 746C.Five samples shall be tested in the as-received condition to benchmark the performance. Five samplesshall be tested after 70C w
37、ater absorption conditioning according to the Water Exposure and Immersiontests (sections 26 and 58) in UL 746C. Five additional samples of specimens for a joint intended for useoutdoors or in wet locations shall be tested following exposure to xenon-arc ultra-violet light and water for1000 hours ac
38、cording to the Ultraviolet Light Exposure Test (section 57) in UL 746C. After eachconditioning, at least 70 percent of the tensile strength and elongation measured in the as-receivedcondition shall be retained. The test specimens shall be in accordance with ASTM D412, Standard TestMethods for Vulcan
39、ized Rubber and Thermoplastic Elastomers - Tension, Die C.7.5.4 Identification of compounds7.5.4.1 The material shall be subjected to the infrared spectroscopy (IR), thermogravimetric analysis(TGA), and differential scanning calorimetry (DSC) tests specified in accordance with the Standard forPolyme
40、ric Materials - Short Term Property Evaluations, UL 746A.9.2.4 Where specified, the deflection range of an expansion-deflection, or deflection joint shall be providedwith the maximum deflection range for the joint in the installation instructions or marked on the smallestunit carton, when shipped fr
41、om the factory.RATIONALE FOR DECISION:The UL Standard for Schedule 40, 80, Type EB and Type A Rigid PVC Conduit and Fittings, UL 651,currently does not include requirements for expansion-deflection joints or deflection joints in the standard.This proposal serves to provide the requirements to evalua
42、te the joint for the degree of movementspecified by the manufacturer, and provided in the installation instructions with the fitting. Theserequirements provide an alternative approach to testing for deflection where conditions for the expansionjoint has a declared defection range that is considered
43、to be represented by the reciprocations testsequence. These requirements are significantly correlated with requirements for expansion-deflection anddeflection fittings for metallic conduit already found in UL 514B, the Standard for Safety for Conduit, Cableand Cable Fittings.Copyright 2014 Underwrit
44、ers Laboratories Inc.UL, in performing its functions in accordance with its objectives, does not guarantee or warrant thecorrectness of Certification Requirement Decisions it may issue or that they will be recognized or adoptedby anyone. Certification Requirement Decisions are the opinion of Underwr
45、iters Laboratories Inc. inpractically applying the requirements of the standard. They do not represent formal interpretations of thestandard under American National Standards Institute (ANSI) processes. UL shall not be responsible toanyone for the use of or reliance upon Certification Requirement De
46、cisions by anyone. UL shall not incurany obligation or liability for damages, including consequential damages, arising out of or in connectionwith the use or reliance upon Certification Requirement Decisions. The electronic version of theCertification Requirement Decision is the current version and previously printed copies may be outdated.STANDARD NUMBER: UL 651 -5-UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION ORDISTRIBUTION WITHOUT PERMISSION FROM ULThis document is published as a service to ULs certification customersSTANDARD NUMBER: UL 651 -6-
