Home Cart Quotation About-Us
www.ChineseStandard.net
SEARCH

GB/T 7424.21-2021 English PDF

Q: How long will the true-PDF of English version of GB/T 7424.21-2021 be delivered?

Upon your order, we will start to translate GB/T 7424.21-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 5 ~ 8 working days. The lengthier the document the longer the lead time.

Q: Can I share the purchased PDF of GB/T 7424.21-2021_English with my colleagues?

Yes. The purchased PDF of GB/T 7424.21-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Q: Does the price include tax/VAT?

Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries). Avoidance of Double Taxation Agreements (DTAs) between Singapore and 100+ Countries: https://www.iras.gov.sg/taxes/international-tax

Q: Do you accept my currency other than USD?

Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.

US$1329.00 · In stock
Delivery: <= 8 days. True-PDF full-copy in English will be manually translated and delivered via email.
GB/T 7424.21-2021: Optical fibre cable generic specification - Part 21: Basic optical cable test procedures - Mechanical test methods
Status: Valid

Standard ID	USD	BUY PDF	Lead-Days	Standard Title (Description)	Status
GB/T 7424.21-2021	1329	Add to Cart	8 days	Optical fibre cable generic specification - Part 21: Basic optical cable test procedures - Mechanical test methods	Valid

Similar standards

YD/T 2554.1 GB/T 9771.1 GB/T 20186.1 GB/T 7424.22 GB/T 7424.23 GB/T 7424.20

Basic data

Standard ID: GB/T 7424.21-2021 (GB/T7424.21-2021)
Description (Translated English): Optical fibre cable generic specification - Part 21: Basic optical cable test procedures - Mechanical test methods
Sector / Industry: National Standard (Recommended)
Classification of Chinese Standard: M33
Word Count Estimation: 73,764
Issuing agency(ies): State Administration for Market Regulation, China National Standardization Administration

GB/T 7424.21-2021: Optical fibre cable generic specification - Part 21: Basic optical cable test procedures - Mechanical test methods

---This is a DRAFT version for illustration, not a final translation. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.) will be manually/carefully translated upon your order.
Optical fibre cable generic specification - Part 21.Basic optical cable test procedures - Mechanical test methods ICS 33.180.10 M 33 National Standards of People's Republic of China Partly replace GB/T 7424.2-2008 Optical Cable General Specification Part 21. Basic test methods for optical fiber cables Mechanical performance test methods (IEC 60794-1-21.2020, Opticalfibrecables-Part 1-21.Genericspecification- Released on 2021-10-11 2022-02-01 implementation State Administration for Market Regulation Issued by the National Standardization Management Committee

Foreword Ⅲ 1 Scope 1 2 Normative references 1 3 Method E1.Tensile performance 1 4 Method E2.Wear 4 5 Method E3.Flattening 6 6 Method E4.Impact 8 7 Method E6.Repeated bending 11 8 Method E7.Reverse 12 9 Method E8.Flexure 15 10 Method E10.Bend 16 11 Method E11.Bend 17 12 Method E13.Shot 19 13 Method E17.Flexural rigidity 23 14 Method E18.Bending and over pulley test under tension 28 15 Method E19.Wind-induced vibration 33 16 Method E20.Looping performance 35 17 Method E21.Pull-out force of plug-in flexible cable sheath 36 18 Method E22.Compressive displacement of the coated optical fiber in the spliced flexible optical cable 38 19 Method E23.Verification test of microtubule tubing 39 20 Method E24.Test of installation of optical cable in microtube 40 21 Method E25.Functional test of tear rope 42 22 Method E26.Dancing 43 23 Method E27.Indoor simulation installation test 45 24 Method E28.Mechanical reliability test of optical cables and optical fibers 48 25 Method E29.Optical unit pumping test during jumper 49 26 Method E30.Coefficient of friction between optical cables (drum method) 52 27 Method E31.Microtubule Clearance Test (under consideration) 53 28 Method E32.Creep under alternating tension (applicable to ADSS cable) 53 29 Method E33.Multiple coiling and unwinding performance of optical cable 58 30 Method E34.Dynamic friction coefficient between optical cables (plate method) 59 Appendix A (informative appendix) Structure changes of this part compared with IEC 60794-1-21.2020 61 Appendix B (informative appendix) Technical differences between this part and IEC 60794-1-21.2020 and their reasons 63 Appendix C (informative appendix) Typical test curves and analysis of tensile strain and load for optical fibers and cables 66 Reference 67

Foreword

GB/T 7424 is divided into the following 9 parts. ---Optical Cable General Specification Part 1.General; ---General Specification for Optical Cables Part 20.General Principles and Definitions of Basic Test Methods for Optical Cables; ---General Specification for Optical Cables Part 21.Basic Test Methods for Optical Cables, Mechanical Performance Test Methods; ---General Specification for Optical Cables Part 22.Basic Test Methods for Optical Cables, Environmental Performance Test Methods; ---General Specification for Optical Cables Part 23.Basic Test Methods for Optical Cables Test Methods for Optical Cable Components; ---General Specification for Optical Cables Part 24.Basic Test Methods for Optical Cables, Electrical Test Methods; ---Optical Cable Part 3.Sectional Specification for Outdoor Optical Cable; ---Optical Cable Part 4.Sectional Specification Optical Fiber Composite Overhead Ground Wire; ---Optical Cable Part 5.Sectional Specification for Miniature Optical Cables and Optical Fiber Units for Air Blown Installation. This part is Part 21 of GB/T 7424. This part was drafted in accordance with the rules given in GB/T 1.1-2009. GB/T 7424.20~GB/T 7424.24 jointly replace GB/T 7424.2-2008 "Optical Cable General Specification Part 2.Optical Cable Basic experiment method". This part replaces Chapter 5 to Chapter 20 in GB/T 7424.2-2008.This part and GB/T 7424.2-2008 Compared with Chapter 5 to Chapter 20, the main technical changes are as follows. ---E1 revised the steering pulley and chuck diameter requirements [see 3.3b) and 3.3d), the.2008 edition of 5.3a) 1)]; --- E1 added "The distribution of monitoring fibers should be representative, such as evenly distributed in different loose tubes and skeleton grooves, or different Optical fiber ribbon, or the middle and edge of optical fiber ribbon" [see 3.4.1g),.2008 edition of 5.4]; --- In E1, the stretching speed is modified to "When the optical cable is one back and forth (such as 2×25m), the stretching speed of the stretching machine should be 5mm/min~10mm/min, for optical cables with a small tensile modulus of elasticity, other larger tensile rates can also be used" [see 3.4.1d), 5.4 of the.2008 edition]; ---E1 has added stretching program 1 and sorted out the program order of the.2008 edition and named it program 2 (see 3.4.2,.2008 edition 5.4); --- E1 deleted Figure 4 "Example of relationship between elongation and load function of optical fiber and optical cable" (see Figure 4 of the.2008 edition); ---E2A modified the wear movement length from (10±1)mm to (40±1)mm (see 4.3.1, 6.1.3 in the.2008 edition); --- E2 has added the requirement that "E2B is not applicable to color bars and other sheath marks formed by extrusion" (see 4.1); --- E2A has added a 1.0mm steel needle diameter (see 4.3.1, 4.4.1.1, 6.1.3 and 6.2.3.1 in the.2008 edition); --- E2 adds the requirement that the load is 4N in E2A and E2B method 1 (see 4.3.2); --- E2 adds the requirement of 5N load in E2B method 2 (see 4.4.2.3); --- E2 added the requirement that the width of wool felt "should be 40mm", and added a note on the description of wool felt [see 4.4.1.2b)]; --- After the E2A test is deleted in E2, the optical fiber should maintain the requirements of optical continuity (see 4.3.3, 6.1.5 of the.2008 edition); --- E2 adds the requirement that the number of wear cycles in E2B method 1 is 4 (see 4.4.2.2); --- In E2, the sample placement method in E2B Method 2 is modified as "The optical cable sample containing the mark should be placed between the two wool felts. Sometimes between the wool felt and the supporting surface" (see 4.4.2.3, 6.2.4.2 of the.2008 edition); --- E2 deleted the "Method 1" in E2B for hard logo types, such as embossed, embossed and fused structure logos, method 2 Applicable to the “marks other than the above types” (see 6.2.1 of the.2008 edition); ---E3A and E3B names are added to E3, E3A is plate/plate, E3B is mandrel/plate (see 5.3, 5.4); ---E3B mandrel/plate flattening method has been added to E3 (see 5.4); --- In E3, the flattening holding time of E3A is modified to "Typical flattening holding time is 1min or 10min" (see 5.3.2, 7.4 in.2008); ---E4 modified the requirements of punch shape (see 6.3, 8.3 of the.2008 edition); --- Deleted the stability of the peel force of the E5 cabled fiber and moved to GB/T 7424.23 (see Chapter 9 of the.2008 edition); --- E6 deleted the repeated bending test of the optical cable in Figure 9 (see 10.3 of the.2008 edition); --- E6 adds the requirement that the bending radius should not be greater than 20 times the diameter of the optical cable or the minimum mandrel radius (see 7.3); --- E6 added "The mandrel with radius R should be rotated when bending" (see 7.3); --- E7 added "Table 1 Typical Test Maximum Torsion Length" (see 8.4); --- E7 added "or 90° (torsion length is 50% of Table 1)" (see 8.4); --- E7 deleted "Tension imposed by Table 1" (see 11.4 of the.2008 edition); ---E8 added the description "This is a special test for special optical cables, such as elevator optical cables or similar optical cables" (see 9.1); ---E8 has increased the diameter requirements of pulley A and pulley B, and the requirements for the distance between each other (see 9.3); --- E10 has added the calculation formula (1) of the equivalent ring diameter (see 10.4); ---E11 has added the double helix winding method in the curved E11A winding (see 11.4.1); ---E11 added "Figure 14 bending test device" (see 11.3); --- Deleted "E12 cut-through resistance" (see Chapter 15 of the.2008 edition); ---E13 deletes the requirements of No. 4 or No. 7 bullets [see the.2008 edition of 16.3.2c), 16.4.2d)]; --- Modify the name of E17, from "rigid" to "bending rigid" (see Chapter 13, Chapter 17 of the.2008 edition); ---E17 has added a description of the test characteristics (see 13.1, 17.1 in the.2008 edition); ---E17 has added the test name, E17A is three-point bending, E17B is cantilever bending, and E17C is C-shaped bending (see 13.3, 13.4, 13.5); --- In E17, the figure "Example of test results of applied force and displacement" in E17A is modified, and the transition zone between elastic and inelastic is given (See Figure 19 in Chapter 13, Figure 21 in Chapter 17 of the.2008 edition); ---E17 has added the "definition of spacing factor" (see 13.5.3); ---Modified the name of E18, from "bending under tension (over pulley test)" to "bending under tension and over pulley test" (see Chapter 14, Chapter 18 of the.2008 edition); ---Modified the name of E18A for bending under tension (see 14.1, 18.1 of the.2008 edition); ---Modified the name of E18B to the pulley test (mainly applicable to OPGW, OPPC, ADSS, OPAC optical cable) (see 14.2, 18.1 of the.2008 edition); --- E18 has added the requirement that "the distance between point A and point B should be at least three times the pitch length" (see 14.1.2, 14.2.2); --- E18B has added three pulleys "arranged in a straight line" (see procedure 2 in 14.2.3); ---E19 has added a regulation of 107 vibrations (see 15.4); --- Increased the pull-out force of the E21 plug-in cord optical cable sheath (see Chapter 17); --- Increased the compression displacement of the coated optical fiber in the E22 patch cord optical cable (see Chapter 18); ---Added E23 microtubule pipeline verification test (see Chapter 19); ---Added the installation test of the optical cable in the E24 microtube (see Chapter 20); ---Added E25 tear rope function test (see Chapter 21); ---Added E26 dancing (see Chapter 22); ---Added E27 indoor simulation installation test (see Chapter 23); ---Added the mechanical reliability test of E28 optical cable and optical fiber (see Chapter 24); ---Added the optical unit pumping test during E29 jumper (see Chapter 25); --- Increased the friction coefficient between E30 optical cables (drum method) (see Chapter 26); ---Added E31 microtube clear space test (under consideration) (see Chapter 27); ---Increase the creep under E32 alternating tension (applicable to ADSS optical cable) (see Chapter 28); --- Increased the performance of multiple coiling and unwinding of E33 optical cable (see Chapter 29); --- Increased the coefficient of dynamic friction between E34 optical cables (plate method) (see Chapter 30). This part uses the redrafting method to modify and adopt IEC 60794-1-21.2020 ``Optical Cable Part 1-21.General Specification Optical Cable Basic Test Test Method Mechanical Performance Test Method". Compared with IEC 60794-1-21.2020, this part has many structural adjustments. Appendix A lists this part and IEC 60794- 1-21.2020 chapter number comparison list. Compared with IEC 60794-1-21.2020, this part has technical differences. The corresponding technical differences and their reasons are given in Appendix B List. This section also made the following editorial changes. --- Modify the standard name to "General Specification for Optical Cables Part 21.Basic Test Methods for Optical Cables, Mechanical Performance Test Methods"; ---E1 equipment 3.3.b) added "Note. When the test site permits, the number of pulleys should be reduced as much as possible to make the optical cable close to Actual straight laying state"; ---E6's 7.3 equipment adds a note about the friction between the optical cable and the mandrel; ---E7's 8.4 program adds a note about the description of the twisted length; ---E32's 28.1 purpose added note 2 of the difference of different methods; ---Informative appendix C, typical test curves and analysis of tensile strain and load of optical fibers and cables has been added. Please note that some of the contents of this document may involve patents. The issuing agency of this document is not responsible for identifying these patents. This part was proposed by the Ministry of Industry and Information Technology of the People's Republic of China. This part is under the jurisdiction of the National Communication Standardization Technical Committee (SAC/TC485). Drafting organizations of this section. Chengdu Terry Communication Equipment Testing Co., Ltd., Sichuan Huiyuan Optical Communication Co., Ltd., Jiangsu Hengtong Optoelectronics Co., Ltd. Co., Ltd., Chengdu Datang Cable Co., Ltd., YOFC Co., Ltd., China Information and Communication Technology Group Co., Ltd., Jiangsu Zhongtian Technology Co., Ltd., Jiangsu Yongding Co., Ltd., Beijing University of Posts and Telecommunications, Shanghai National Cable Testing Center Co., Ltd., Shantou High-tech Ou Ao Xingguang Communication Equipment Co., Ltd., Jiangsu Nanfang Communication Technology Co., Ltd., Chengdu Hengtong Optical Communication Co., Ltd., Sichuan Tianfu Jiangdong Branch Technology Co., Ltd. The main drafters of this section. Song Zhituo, Shi Bin, Li Yingzhi, Zhao Qiuxiang, Luo Yi, Xue Mengchi, Peng Yuan, Liu Cheng, Xie Shuhong, Li Jing, Li Chunsheng, Luo Bin, Duan Jianbin, Exhibition, Huang Zhengou, Chen Xiaohong, Wu Xiangjun, Guo Yi, Yu Jing, Liu Yuqin, Xiao Rengui, Wei Chengdong, Zuo Qionghua, Bai Wenhai. The previous releases of the standards replaced by this part are as follows. ---GB/T 7425 (all parts)-1987, GB/T 8405 (all parts)-1987; ---GB/T 7424.1-1998 Chapter 3 and Chapter 6; ---GB/T 7424.2-2002; ---GB/T 7424.2-2008 Chapter 5~Chapter 20. Optical Cable General Specification Part 21. Basic test methods for optical fiber cables Mechanical performance test methods

1 Scope

This part of GB/T 7424 specifies the purpose, samples, equipment, procedures, requirements, and details to be specified for each test method for the mechanical properties of optical cables. Sections and details to be reported. This section applies to optical cables, including optical fiber units, micro-tube optical fiber units, etc., and also applies to photoelectric hybrid cables.

2 Normative references

The following documents are indispensable for the application of this document. For dated reference documents, only the dated version applies to this article Pieces. For undated reference documents, the latest version (including all amendments) is applicable to this document. GB/T 7424.20-2021 General Specification for Optical Fiber Cables Part 20.General Principles and Definitions of Basic Test Methods for Optical Fiber Cables (IEC 60794-1- 2.2017, MOD) GB/T 15972.22-2008 Optical fiber test method specification Part 22.Measurement method and test procedure of dimensional parameters---length Degree (IEC 60793-1-22.2001, MOD) GB/T 15972.40 Specification for optical fiber test methods Part 40.Measurement methods and test procedures for transmission characteristics and optical characteristics Sequence---attenuation (GB/T 15972.40-2008, IEC 60793-1-40.2001, MOD) GB/T 15972.46-2008 Optical fiber test method specification Part 46.Measurement methods and tests for transmission characteristics and optical characteristics Procedure---Transmittance change (IEC 60793-1-46.2001, MOD) GB/T 22077-2008 Creep test method for overhead conductors (IEC 61395.1998, IDT) 3 Method E1.Tensile performance 3.1 Purpose This test is suitable for testing the attenuation of the optical cable under test, the elongation strain of the optical fiber, and/or the strain of the optical cable under a specific tensile force. As a function of the load, this load may occur during installation or operation. The intent of this test is non-destructive. 3.2 Specimen Unless otherwise specified in the relevant specifications, the tested length is the sum of the length of the optical cable between the entry point of two chucks and the circumference of a chuck. The length is not less than 50m. For optical cables that require special anchoring (such as OPGW, ADSS, thick steel wire armored optical cables, etc.), the tested length is not small At 25m. Excessively short length specimens in the tensile test will affect the measurement accuracy. The length indicated above is the minimum length given for this test. The total length of the sample should be greater than the length of the test, in order to clamp and connect to the measuring equipment. 3.3 Equipment The test equipment is shown in Figure 1 and Figure 2.Equipment includes. a) An attenuation measuring device for measuring attenuation changes (see GB/T 15972.40), and an optical fiber elongation strain measuring device (see ......

Image

Tips & Frequently Asked Questions:

Question 1: How long will the true-PDF of GB/T 7424.21-2021_English be delivered?

Answer: Upon your order, we will start to translate GB/T 7424.21-2021_English as soon as possible, and keep you informed of the progress. The lead time is typically 5 ~ 8 working days. The lengthier the document the longer the lead time.

Question 2: Can I share the purchased PDF of GB/T 7424.21-2021_English with my colleagues?

Answer: Yes. The purchased PDF of GB/T 7424.21-2021_English will be deemed to be sold to your employer/organization who actually pays for it, including your colleagues and your employer's intranet.

Question 3: Does the price include tax/VAT?

Answer: Yes. Our tax invoice, downloaded/delivered in 9 seconds, includes all tax/VAT and complies with 100+ countries' tax regulations (tax exempted in 100+ countries) -- See Avoidance of Double Taxation Agreements (DTAs): List of DTAs signed between Singapore and 100+ countries

Question 4: Do you accept my currency other than USD?

Answer: Yes. If you need your currency to be printed on the invoice, please write an email to Sales@ChineseStandard.net. In 2 working-hours, we will create a special link for you to pay in any currencies. Otherwise, follow the normal steps: Add to Cart -- Checkout -- Select your currency to pay.