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GB 8965.4-2022 English PDF (GB8965.4-2022)

GB 8965.4-2022 English PDF (GB8965.4-2022)

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GB 8965.4-2022: Protective clothing -- Arc flash protective clothing

This document specifies the requirements, marking and packaging of arc flash protective clothing for electrical work and related workplaces; describes test methods. This document is applicable to protective clothing, that is used to protect against arc flash instant energy and thermal injury, in electrical operations and related workplaces. This document does not apply to insulating protective clothing, electromagnetic protective clothing, shielding clothing for live work in electrical work and related places. This document does not include personal arc flash protection supplies, such as arc protection masks, arc protection hoods, arc protection gloves, arc protection shoe covers.
GB 8965.4-2022
GB
NATIONAL STANDARD OF THE
PEOPLE REPUBLIC OF CHINA
ICS 13.340.10
CCS C 73
Protective clothing - Arc flash protective clothing
ISSUED ON: DECEMBER 29, 2022
IMPLEMENTED ON: JANUARY 01, 2024
Issued by: State Administration for Market Regulation.
Standardization Administration of PRC.
Table of Contents
Foreword ... 3
Introduction ... 4
1 Scope ... 5
2 Normative references ... 5
3 Terms and definitions ... 7
4 Requirements ... 9
5 Test methods ... 14
6 Marking and packaging ... 16
Appendix A (Informative) Calculation methods and examples of arc hazard energy . 19 Appendix B (Normative) Test method of arc protection performance of fabrics ... 27 References ... 47
Protective clothing - Arc flash protective clothing
1 Scope
This document specifies the requirements, marking and packaging of arc flash protective clothing for electrical work and related workplaces; describes test methods. This document is applicable to protective clothing, that is used to protect against arc flash instant energy and thermal injury, in electrical operations and related workplaces. This document does not apply to insulating protective clothing, electromagnetic protective clothing, shielding clothing for live work in electrical work and related places. This document does not include personal arc flash protection supplies, such as arc protection masks, arc protection hoods, arc protection gloves, arc protection shoe covers.
2 Normative references
The contents of the following documents constitute essential provisions of this document through normative references in the text. Among them, for dated reference documents, only the version corresponding to the date applies to this document; for undated reference documents, the latest version (including all amendments) applies to this document.
GB/T 2912.1 Textiles - Determination of formaldehyde - Part 1: Free and hydrolyzed formaldehyde (water extraction method)
GB/T 3291.1 Textiles - Terms of textile material properties and test - Part 1: Fiber and yarn
GB/T 3291.2 Textiles - Terms of textiles material properties and test - Part 2: Fibric GB/T 3291.3 Textiles - Terms of textile material properties and test - Part 3: General GB/T 3916-2013 Textiles - Yarns from packages - Determination of single-end breaking force and elongation at break using constant rate of extension (CRE) tester GB/T 3917.3 Textiles - Tear properties of fabrics - Part 3: Determination of tear force of trapezoid-shaped test specimens
GB/T 3920 Textiles - Tests for color fastness - Color fastness to rubbing 4.1.4.4 If exposed accessories or markings are used, the base fabric material shall be flame retardant material. If the enterprise logo adopts embroidery and other techniques, there shall be no melting or burning when tested according to 5.3.
4.1.4.5 The collar, facing, sleeves, hem tabs, waistband, pocket flaps and other parts of the arc flash protective clothing can be lined. The lining parts shall be free of glue permeation and shall be washed 20 times, according to the 4N method in GB/T 8629- 2017. There shall be no blistering or delamination.
4.2 Style
The style of arc flash protective clothing shall be simple and practical. Choose from the following styles:
a) Gown style;
b) Separate bottom installation;
c) One-piece trousers.
4.3 Model and size
4.3.1 The model and size of the arc flash protective clothing shall be selected according to the size range of GB/T 13640. If it exceeds the size range of GB/T 13640, it shall be set according to the grade difference. According to the style and usage requirements, the finished size of the protective clothing is set according to the control parts in GB/T 13640. The size measurement position and size limit deviation of the main parts of the finished arc flash protective clothing shall comply with the requirements of FZ/T 81007. 4.3.2 The size of the hood, gloves, shoe covers, etc. can be determined by yourself; however, they must not affect the activities and work of the limbs and head. 4.4 Structural design
4.4.1 Arc flash protective clothing and accompanying protective equipment shall completely cover the exposed areas of the body; the clothing shall be long-sleeved to protect the entire upper body.
4.4.2 The design and connection parts of arc flash protective clothing shall ensure easy and quick putting on and taking off; it shall avoid tight-fitting designs. 4.4.3 The length of the split top shall cover the upper end of the pants by more than 20 cm; the collar and cuffs shall adopt an adjustable closure structure.
4.4.4 When a coat pocket is required, the pocket opening shall be sealed with a flap or closure. The length of the pocket flap shall be at least 2 cm longer than the length of the pocket opening; the closure shall be covered with arc-proof fabric.
5.2 The unit area mass of arc flash protective clothing fabrics is tested according to method 3 in GB/T 4669-2008.
5.3 The flame retardancy of fabrics and linings are tested, according to the method specified in Condition A in GB/T 5455-2014. If the arc flash protective clothing fabric is composed of multiple layers, each layer shall be tested separately. If the fabric contains a non-flame-retardant functional layer, the functional layer shall not melt or drip. Arc-proof flame-retardant fabrics shall be washed separately from non-flame- retardant fabrics, to avoid contamination of flammable substances from other fabrics. If there are no special instructions, the fabrics and linings in this document shall be washed using the type A automatic washing machine specified in GB/T 8629-2017, using normal stirring for 12.5 hours, rinsing for 8 hours, hanging to dry. The water shall be changed twice during the washing process; dehydrated for 2 minutes before each water change. The detergent used for washing shall be neutral, which has a pH of 7.0 ~ 7.5. Or use a type A automatic washing machine and use neutral detergent to wash 50 times, according to the 4 N method in GB/T 8629-2017; hang to dry. If the clothing is marked as non-washable clothing, it does not need to be subject to washing pretreatment before testing.
5.4 The breaking strength of the fabric is tested according to GB/T 3923.1. If the fabric of arc flash protective clothing is composed of multiple layers, only the breaking strength of the outermost layer of fabric is tested.
5.5 The tearing strength of the fabric is tested according to GB/T 3917.3. If the arc flash protective clothing fabric is composed of multiple layers, only the tearing strength of the outermost layer of fabric is tested.
5.6 The bursting strength of the fabric is tested according to the requirements of GB/T 7742.1; the test area is 7.3 cm2.
5.7 The moisture permeability of fabrics is tested in accordance with GB/T 12704.1. 5.8 The pilling test of woven fabrics shall be tested in accordance with GB/T 4802.1; the pilling test of knitted fabrics shall be tested in accordance with GB/T 4802.3. 5.9 The dimensional change rate and relaxed dimensional change rate of the fabric are tested in accordance with the requirements of GB/T 8628 and GB/T 8630, using the 4 N program in GB/T 8629-2017. Woven fabrics are dried by hanging, whilst knitted fabrics are dried by laying flat. If the instructions for use requires gentle wash or hand wash, use the 4 G or 4 H program. The number of washes is 1.
5.10 The thermal stability of fabrics and linings is tested, in accordance with Appendix A of GB 8965.1-2020, at a temperature of (180 ?? 2) ??C.
5.11 The color fastness of fabrics to soaping is tested, in accordance with GB/T 3921. 5.12 The color fastness to rubbing of fabrics is tested, in accordance with GB/T 3920. 5.13 The color fastness to perspiration of fabrics is tested, in accordance with GB/T 3922.
5.14 The formaldehyde content of fabrics, linings, finished products shall be tested, in accordance with GB/T 2912.1.
5.15 The pH value of fabrics, linings, finished products shall be tested, in accordance with GB/T 7573.
5.16 The decomposable carcinogenic aromatic amine dyes in fabrics and linings are tested, according to the requirements of GB/T 17592 and GB/T 23344.
5.17 The odor of fabrics and linings shall be tested, according to the provisions of 6.7 in GB 18401-2010.
5.18 The sewing thread strength is tested according to the provisions of method A or method B in GB/T 3916-2013.
5.19 The thermal resistance of sewing threads is tested, according to the provisions of 6.19 in GB 8965.1-2020.
5.20 For the seam breaking strength of arc flash protective clothing, it is tested according to the method specified in GB/T 21294 for woven fabric clothing. The seam strength of clothing made of knitted fabric materials is tested, according to the method specified in FZ/T 70007. The test locations are the crotch seam and armpit of the pants; take a sample from each part.
5.21 The dimensional change rate of arc flash protective clothing after washing is tested, in accordance with the provisions of GB/T 8628 and GB/T 8630, using the 4 N program in GB/T 8629-2017 for washing; the number of washings is 1. Woven fabrics are dried by hanging; knitted fabrics are dried by laying flat.
6 Marking and packaging
6.1 Marking
6.1.1 Each piece (set) of arc flash protective clothing shall have a durability label, accompanied by a certificate and instructions for use provided by the manufacturer. 6.1.2 Durability labels shall comply with the requirements of 7.2 in GB/T 5296.4-2012. The durability label of each piece (set) of arc flash protective clothing shall have product name, product model number, material composition, description of whether the material is intrinsically flame-retardant fabric or post-processed flame-retardant fabric, whether it uses the description of prohibited flame retardants, graphic symbols, washing methods, production date, batch, expiry date, manufacturer name, production address, etc., in Appendix E of GB/T 18885-2020; non-washable clothing shall be marked "not Appendix A
(Informative)
Calculation methods and examples of arc hazard energy
A.1 Overview
Calculate the estimated possible arc hazard energy, based on relevant influencing factors, such as system voltage, fault current, arc duration, operating distance under typical operating conditions. The arc energy value of the arc flash protective clothing purchased and configured must not be lower than the calculated arc accident energy value.
Note 1: The empirical formulas involved in this Appendix come from IEEE 1584-2018 and NFPA 70E-2018.
Note 2: The curve fitting calculation method and calculation examples in this Appendix refer to the relevant results of "Research on Adaptability Technology for Non-power Outage Operation of Medium and Low Voltage Distribution Networks".
A.2 Calculation steps of arc hazard energy
The calculation of arc hazard energy requires the following steps:
a) Collect system and installation data, such as system capacity, system single-line diagram, system grounding conditions, working environment, etc.;
b) Determine the system operation mode, such as system opening and closing conditions, system operation mode (whether there is parallel or backup operation), etc.;
c) Calculate the short-circuit current at the operating point, such as calculating the three-phase short-circuit current, at the operating point of the low-voltage distribution system;
d) Calculate the arc current. The arc current mainly depends on the three-phase short- circuit current. Due to the existence of arc impedance, the calculated arc lightning current will be smaller than the short-circuit current, especially in low-voltage systems;
e) Investigate the characteristics of the protection device and determine the arc duration; determine the arc duration, by investigating the time-current characteristics of the secondary protection device in the system;
B.2.6.2 The collection frequency of temperature data (thermal output value) of each calorimeter shall not be less than 20/s. The maximum temperature that the collection system can record shall not be less than 400 ??C; the minimum resolution is 0.1 ??C; the accuracy is ??0.75 ??C.
B.2.6.3 The collection frequency of current and voltage data shall be no less than 2000 per second; the minimum resolution is 1% of the applied voltage and current value for the test.
B.2.7 Data collection system protection
In view of the certain destructiveness of this test method, safety protection and isolation measures shall be used at the output end of the calorimeter.
B.3 Safety protection measures
B.3.1 The test equipment will release a large amount of energy; the arc will produce strong light. Attention shall be paid to protecting the safety of personnel in the work area. Workers shall be behind a protective barrier or at a safe distance, to prevent electric shock and contact with molten metal. Staff who need to directly observe the test need to wear appropriate protective glasses. If the test is conducted indoors, a ventilation system shall be used to remove combustion products, smoke, exhaust gases. Air flow will interfere with the arc and reduce the heat flux on the calorimeter surface. The equipment in the test area can be shielded with non-combustible materials. When testing outdoors, test samples shall be protected from exposure to moisture and wind. The starting device of the test equipment shall be placed in a place which is not affected by arc flash explosions; the test equipment shall be insulated from ground, to ensure that the required test voltage is achieved.
B.3.2 Test equipment, electrodes, calorimeters will generate heat during the test process. Gloves and sleeves shall be worn, when touching and handling these objects. B.3.3 If the sample is burning or releasing flammable gas, special care shall be taken. A fire extinguisher shall be prepared, to ensure that all materials can be extinguished in time if they catch fire.
B.3.4 The power supply shall be turned off promptly after each test is completed, to prevent accidental arcing in the test equipment and all other test equipment. Test equipment and other laboratory equipment shall be insulated and grounded. After data collection is completed and before personnel enter, the test area shall be ventilated. No one is allowed to enter the test area, until the smoke and exhaust gases are exhausted. B.4 Preparation of specimens
B.4.1 Test sample of dual-sensor test panel
The test sample clamped on the dual-sensor flat panel shall have a length of not less ?€ - 3.14159;
d - The diameter of the circle-cut sample, in meters (m).
d) The test results are based on the average mass per unit area of 3 samples. B.5 Test procedures
B.5.1 Test parameters
The arc current shall be (8 ?? 1) kA; the electrode spacing shall be 30.5 cm; the distance from the center line of the arc electrode to the sample surface shall be 30.5 cm. If other test parameters are used, they can be recorded in the report as needed. B.5.2 Test steps
B.5.2.1 Cut 21 samples from the same fabric; use 3 samples for each test; fix them on 3 sets of dual-sensor flat panels, respectively.
B.5.2.2 Conduct at least 7 tests, using a range of incident energies, to evaluate the arc rating of the fabric. Determining the ATPV value requires the average of at least 20 incident energies, as measured by monitoring and flat-panel sensors, that meet the requirements of b) ~ d).
a) The range of incident energy is obtained by increasing or decreasing the arc duration.
b) The incident energy, which is measured by the dual-sensor flat panel during an arc flash explosion (this value is the average of the two monitoring sensors), shall exceed second-degree burn criteria, as predicted by the Stoll curve (as per B.6.1.4) by at least 15%.
c) The incident energy, which is measured by the dual-sensor flat panel during an arc flash explosion (this value is the average of the two monitoring sensors), shall be at least 15% lower than the second-degree burn criteria, as predicted by the Stoll curve (as determined by B.6.1.4).
d) At least 50% of the incident energy, which is measured by the dual-sensor flat panel during an arc flash explosion (this value is the average of the two monitoring sensors) falls within the ??20% tolerance range of the final ATPV value (as determined by B.6.1.4, see B.5.2.6). Values within this range will typically both exceed and not exceed the Stoll Curve criteria.
B.5.2.3 All data points shall be valid, but when the temperature of the copper plug calorimeter used for the flat panel and monitoring sensor displays exceeds 400 ??C, it indicates that there is a test/data collection equipment failure or sample clamping error. At this time, the data is invalid.
B.5.2.4 When the number of tests meets the minimum number requirements, all valid data points shall be used and shall not be discarded arbitrarily.
B.5.2.5 Data processing for sample breakopen or inner layer ignition of multi-layer samples shall be carried out as follows.
a) When the sample is breakopen or the inner layer of the multi-layer sample ignites, the collected data points are valid and can be used to determine the ATPV value. b) If two or more breakopens occur in the fabric and are observed when the incident energy is less than 1.2 times the ATPV value, it shall be determined to be breakopen. In this case, more than 7 tests shall be conducted before the conclusion of breakopen can be made. There are cracking treatments above or below the Stoll curve criteria, see B.6.2.
B.5.2.6 In order to make 50% of the data points fall within the 20% tolerance range of the final ATPV value of the test sample, an iterative method shall be used. After the first two arc flashes, if the 6 test results are both higher and lower than the Stoll curve criteria, an estimated value of the ATPV value can be determined; this estimated value can be used as the test parameter for subsequent tests, to allow 50% of the measurement results of sensor flat panel to fall within a 20% tolerance of the final ATPV value of the test sample. Under standard circumstances, at least 11 of the 21 data points shall have incident energy values within a 20% tolerance range of the final ATPV value, before all data can be considered valid. Therefore, if there are less than 11 data points within this range, the number of tests shall be increased, until 50% of the data points are within this range.
B.5.2.7 Use the maximum difference -- between the average thermal value measured on the flat-panel sensor and the corresponding point on the Stoll curve -- as the independent variable; use the average incident energy measured by each group of flat panels as the dependent variable. The curve which is fitted through least squares method can be used to guide the selection of appropriate incident flash burst energy. The y- intercept value is the estimate of the final ATPV value.
B.5.2.8 The ATPV value of multi-layer flame retardant fabrics is determined according to the following method.
a) If the incident energy of any flame-retardant layer of the multi-layer flame- retardant fabric, except the innermost layer (i.e., closest to the sensor flat panel), is less than the measured ATPV value of the multi-layer fabric, then the incident energy is determined as melting energy (Eab). When the innermost layer also melts or cracks, it is determined as the breakopen threshold energy (EBT). See B.6.2 for the determination method of breakopen threshold energy; see 3.7 for the breakopen judgment criteria.
b) The melting energy (Eab...

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