UL RP 5770-2018 UL Standard for Safety Recommended Practice for Evaluating Cables for Use in Repeated Flexing Applications (First Edition).pdf

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1、UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL UL RP 5770 Recommended Practice for Evaluating Cables for Use in Repeated Flexing ApplicationsUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION

2、FROM ULUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL Recommended Practice for Evaluating Cables for Use in Repeated Flexing Applications, UL RP 5770 First Edition, Dated August 10, 2018 Summary of Topics This Recommended Practice for Evalu

3、ating Cables for Use in Repeated Flexing Applications, UL RP 5770, provides a test methods for evaluating the effects that repetitive motion has on cables. All rights reserved. No part of this publication may be reproduced, stored in a retrieval system, or transmitted in any form by any means, elect

4、ronic, mechanical photocopying, recording, or otherwise without prior permission of UL. UL provides this Recommended Practice “as is” without warranty of any kind, either expressed or implied, including but not limited to, the implied warranties of merchantability or tness for any purpose. In no eve

5、nt will UL be liable for any special, incidental, consequential, indirect or similar damages, including loss of prots, lost savings, loss of data, or any other damages arising out of the use of or the inability to use this Recommended Practice, even if UL or an authorized UL representative has been

6、advised of the possibility of such damage. In no event shall ULs liability for any damage ever exceed the price paid for this Recommended Practice, regardless of the form of the claim. Users of the electronic versions of ULs Recommended Practices agree to defend, indemnify, and hold UL harmless from

7、 and against any loss, expense, liability, damage, claim, or judgment (including reasonable attorneys fees) resulting from any error or deviation introduced while purchaser is storing an electronic Recommended Practice on the purchasers computer system. AUGUST 10, 2018 UL RP 5770 tr1UL COPYRIGHTED M

8、ATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 10, 2018 UL RP 5770 tr2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 10, 2018 1 UL RP 5770 Recommended Practice f

9、or Evaluating Cables for Use in Repeated Flexing Applications First Edition August 10, 2018 This Recommended Practice provides a set of instructions for performing one or more specic operations. This Recommended Practice contains only non-mandatory provisions. ULs Recommended Practices are copyright

10、ed by UL. Neither a printed nor electronic copy of a Recommended Practice should be altered in any way. All of ULs Recommended Practices and all copyrights, ownerships and rights regarding those Recommended Practices shall remain the sole and exclusive property of UL. COPYRIGHT 2018 UNDERWRITERS LAB

11、ORATORIES INC.UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL AUGUST 10, 2018 UL RP 5770 2 No Text on This PageUL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL CONTENTS ABSTRACT INTRO

12、DUCTION 1 Scope .4 2 General 4 2.1 Units of measure .4 2.2 Normative references .4 2.3 Safety .4 2.4 Denitions .5 2.5 Test temperature .5 2.6 Tolerances 5 2.7 Reports .6 3 Signicance And Use .6 PERFORMANCE 4 Tick-Tock Test 7 4.1 Test parameters 7 4.2 Apparatus .7 4.3 Preparation of specimens 8 4.4 P

13、rocedure .9 4.5 Report 9 5 Torsion test 9 5.1 Test parameters 9 5.2 Apparatus 10 5.3 Preparation of specimens 10 5.4 Procedure 11 5.5 Report .11 6 Chain track (C-track) Test .12 6.1 Test parameters .12 6.2 Apparatus 12 6.3 Preparation of specimens 13 6.4 Procedure 14 6.5 Report .14 7 Flexing Test 14

14、 7.2 Apparatus 14 7.3 Preparation of specimens 15 7.4 Procedure 16 7.5 Report .16 8 Evaluation 16 8.1 Electrical tests 16 9 Construction Review .17 9.1.1 Visual examination .17 AUGUST 10, 2018 UL RP 5770 3UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISS

15、ION FROM UL ABSTRACT This Recommended Practice provides the details required in order to perform different exing tests in order to obtain repeatable results. INTRODUCTION 1 Scope 1.1 This Recommended Practice provides test procedures for evaluating the capability of a cable to withstand different ex

16、ing motions. One or more of these tests may be used depending on the specic application. 2 General 2.1 Units of measure 2.1.1 The unit of measure is dened as SI. If a value for measurement is followed by a value in other units in parentheses, the second value represents a direct conversion or an alt

17、ernative value. 2.2 Normative references Standard for Appliance Wiring Material, UL 758 Standard for Wire and Cable Test Methods, UL 2556 2.3 Safety 2.3.1 General 2.3.1.1 It is not the intent of this recommended practice to address all of the safety issues associated with its use. It is the responsi

18、bility of the user of the recommended practice to train personnel, establish proper health and safety procedures and be aware of, and comply with, local, state/provincial, and national regulatory restrictions that apply. AUGUST 10, 2018 UL RP 5770 4UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER

19、REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.3.2 Electrical hazards 2.3.2.1 Certain test procedures require high voltage. It is important that the equipment be designed to comply with good engineering practices, with safety being an integral part of the design. To avoid electric shock i

20、n such cases, necessary precautions shall be taken and test equipment manufacturers recommendations shall be followed. 2.3.3 Mechanical hazards 2.3.3.1 Some tests utilizing mechanical equipment can expose the operator to mechanical hazards. Care shall be exercised to protect eyes, ngers, hands, and

21、other body parts from injury. 2.4 Denitions 2.4.1 NORMAL VISION vision without any aid other than the examiners normal corrective lenses, if any. 2.4.2 ROOM TEMPERATURE 25 10 C (77 18 F). 2.5 Test temperature 2.5.1 Tests should be conducted at ROOM TEMPERATURE. 2.6 Tolerances 2.6.1 If tolerances are

22、 not provided, the values in Table 2.1 should be used. Table 2.1 Tolerances Parameter Range Tolerance Linear dimensions 1m m 25 mm 0, +1 mm 25 mm 0, +0.5 % Angles All 0, +2 degrees Mass 1 0g 100 g 1% 100 g 5k g 2% 5k g 5% Time 1s 1% Force All 5% Temperature - 3 5 C1 0 0 C 2 C AUGUST 10, 2018 UL RP 5

23、770 5UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 2.7 Reports 2.7.1 In addition to the specic reporting requirements for each test, the following should be included as a minimum in all reports: a) name of test facility; b) date of report;

24、 c) product description; d) name of test conducted; and e) test result. 3 Signicance And Use 3.1 Cables subject to repeated exing applications are subject to numerous different stresses. Testing cables in a repeatable way can provide data for comparing one cable to another. Without repeatable method

25、ology, determining the capabilities of one cable over another is difficult. 3.2 The tests provided are those traditionally used to evaluate a cable for repeated exing applications. The four main tests for cables used in repeated exing applications include C-Track, Tick-tock, torsion and serpentine e

26、x. Addition tests that combine two of the motions into one test may be used in cases where the exing in the actual application takes on a more complex motion. Each of these tests has specic parameters that should be controlled in order to have repeatable results. 3.3 The results found in cables subj

27、ect to these tests do not necessarily represent the number of cycles a cable may withstand in an actual application. 3.4 The test procedures specify the mechanical and electrical criteria necessary for repeatable and reliable means of determination of the number of cycles a cable could withstand. 3.

28、5 The acceptance criteria or pass/fail criteria can vary. Some or all of the layers of the cable may be evaluated for abrasion or wear. The continuity of the conductors and shields may be dened, or conductor be examined and the number of broken strands be recorded. A requirement that the DC resistan

29、ce of the conductor may not change by a certain percentage after the cycling has been completed could be an additional method for determining acceptance. AUGUST 10, 2018 UL RP 5770 6UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL PERFORMANCE

30、 4 Tick-Tock Test This test method establishes a method for evaluating the resistance of cable to stress caused by bending. 4.1 Test parameters 4.1.1 The following test parameters should be specied. a) bending angle, increments of 45 maximum 180; b) weight, increments of 100 g; c) speed, cycles per

31、minute; d) Mandrel diameter; e) distance from the center of the mandrel to the grip holding the cable and from the center of the mandrel to the weight suspended from the sample; and f) distance between mandrel and cable. 4.2 Apparatus 4.2.1 A typical apparatus consists of the following: a) a power-d

32、riven device provided with a mechanism to provide the specied number of cycles at a constant rate bending the specimen using a bending cycle consisting of bending the specimen to the specied position from the vertical, back through the specied angle in the opposite direction and then back to the ver

33、tical (See Figure 4.1); b) a mandrel of the specied radius, R; c) a specied weight, W; and d) a counting device to record the number of cycles. This is generated text for gtxt. AUGUST 10, 2018 UL RP 5770 7UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISS

34、ION FROM UL 4.3 Preparation of specimens 4.3.1 The test specimens should be taken from a sample of nished wire or cable, or from the wire or cable during manufacture without any conditioning. 4.3.2 Each specimen should be of sufficient length to be t in the apparatus. Both ends of the specimens shou

35、ld be stripped to remove the insulation and jacket. The insulation should be removed for a length of 155 mm (6.10 in) and the jacket 50 mm (2 in) from each end of each specimen. Figure 4.1 Tick-tock test conguration su3377 Mandrel Sample X X W R AUGUST 10, 2018 UL RP 5770 8UL COPYRIGHTED MATERIAL NO

36、T AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 4.4 Procedure 4.4.1 Each specimen should be vertically mounted through the xture of the test apparatus shown in Figure 4.1 between two parallel rigid mandrels of specied diameter, with the specied clearance on each side

37、 of the sample, so that the axis of the sample is perpendicular to the parallel mandrels and the surface of the sample is parallel to the mandrels. The specied weight should be attached to the bottom of the test specimen, and allowed to hang freely. 4.4.2 The sample should be exed back-and-forth abo

38、ut the opposing parallel mandrels at the specied rate over the specied angle for the specied number of cycles. One cycle should consist of the specimen moving from the original, vertical position to the specied angle, back to the original, vertical position, to the specied angle in the opposite dire

39、ction and back to the original vertical position. 4.5 Report 4.5.1 The report should include, and is not limited to, the following items: a) number of cycles completed; b) cycles rate used; c) bending angle used; d) weight used; e) mandrel diameter used; f) distance from the center of the mandrel to

40、 the grip holding the cable and from the central of the mandrel to the weight suspended from the sample; g) distance between mandrel and cable; and h) acceptance criteria. 5 Torsion test This test method establishes a method for evaluating the cable resistance of cable to stress caused by a twisting

41、 force. 5.1 Test parameters 5.1.1 The following test parameters should be specied: a) rotation rate, cycles per minute; b) rotation angle, increments of 45; c) weight, increments of 100 g; d) number of cycles; e) length of sample, X; AUGUST 10, 2018 UL RP 5770 9UL COPYRIGHTED MATERIAL NOT AUTHORIZED

42、 FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL f) clamp force; and g) distance between clamps. 5.2 Apparatus 5.2.1 A typical apparatus consists of the following: a) a power-driven device provided with a constant rate of the specied number of cycles per minute twisting the speci

43、men through the specied angle degrees from the starting point, and then back to be starting point. (See Figure 5.1); b) a circuit to detect conductor breakage with lamp, buzzer, bell or other indicator, and stop the torsion apparatus; and c) a counting device to record the number of cycles. This is

44、generated text for gtxt. 5.3 Preparation of specimens 5.3.1 The test specimens should be taken from a sample of nished wire or cable, or from the wire or cable during manufacture without any conditioning. The sample should be straight before testing. If straitening is necessary, it should be done by

45、 hand. Figure 5.1 Torsion test set-up Clamp Sample Clamp W X 180 su3378 AUGUST 10, 2018 UL RP 5770 10UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 5.3.2 Each specimen should be of sufficient length to be t in the apparatus. Both ends of th

46、e specimens should be stripped to remove the insulation and jacket. The insulation should be removed for a length of 155 mm (6.10 in) and the jacket 50 mm (2 in) from each end of each specimen. 5.4 Procedure 5.4.1 Each specimen should be mounted vertically through the top and bottom clamps in the te

47、st apparatus shown in Figure 5.1. The clamps should be secured onto the specimen as specied. 5.4.2 With the specimen in place, the rotation of the clamp(s) should start. The rotation of the clamps(s) should be constant at the specied rate of rotation. Each cycle should consist of rotation through th

48、e specied angle, back through the zero point, through the specied angle in the opposite direction and back to zero. 5.4.3 The rotation should be continued until the specied number of cycles has been completed. 5.5 Report 5.5.1 The report should include, and is not limited to, the following items: a)

49、 rotation rate used, cycles per minute; b) rotation angle used, c) weight used; d) number of cycles completed; e) length of sample used; f) clamp force used; g) distance between clamps; and h) acceptance criteria. AUGUST 10, 2018 UL RP 5770 11UL COPYRIGHTED MATERIAL NOT AUTHORIZED FOR FURTHER REPRODUCTION OR DISTRIBUTION WITHOUT PERMISSION FROM UL 6 Chain track (C-track) Test This test method establishes the method for evaluating the cable resistance of ca