GB 8965.4-2022 PDF English
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GB 8965.4-2022: Protective clothing - Arc flash protective clothing---This is an excerpt. Full copy of true-PDF in English version (including equations, symbols, images, flow-chart, tables, and figures etc.), auto-downloaded/delivered in 9 seconds, can be purchased online: https://www.ChineseStandard.net/PDF.aspx/GB8965.4-2022
GB
NATIONAL STANDARD OF THE
PEOPLE’S 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
Foreword
This document is drafted in accordance with the provisions of GB/T 1.1-2020
"Directives for standardization - Part 1.Rules for the structure and drafting of
standardizing documents".
This document is Part 4 of GB 8965 "Protective clothing". GB 8965 has released the
following parts.
- GB 8965.1-2020 Protective clothing - Flame retardant protective clothing;
- GB 8965.2-2022 Protective clothing - Flame-retardant protection - Part 2.
Protective clothing for welders;
- GB 8965.3-2022 Protective clothing - Clothing to protect against molten metal
splash;
- GB 8965.4-2022 Protective clothing - Arc flash protective clothing.
Please note that some content in this document may be subject to patents. The publisher
of this document assumes no responsibility for identifying patents.
This document was proposed by AND shall be under the jurisdiction of the Ministry of
Emergency Management of the People's Republic of China.
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
3 Terms and definitions
The terms and definitions as defined in GB/T 12903, GB/T 3291.1 ~ 3291.3, GB
8965.1-2020, as well as the following terms and definitions, apply to this document.
3.1
Electric arc
The instantaneous sparks and energy produced by the passage of electric current
through some insulating medium (such as air).
Note. Arc is a gas discharge phenomenon.
3.2
Arc hazard
The injury to personnel or damage to equipment, which is caused by the huge energy
released by the arc flash.
3.3
Arc flash protective clothing
Protective clothing used to protect the torso and limbs of persons who may be
exposed to arc or related thermal hazards.
3.4
Arc hazard energy
The superposition, which is obtained by multiplying the instantaneous arc voltage
value by the instantaneous arc current value, then by the incremental time of arc
release.
3.5
Stoll curves
A standard curve, which is used to predict the relationship between time to achieve
second-degree burns and thermal energy.
Note. Energy values falling above the Stoll curve are likely to cause second-degree burns,
whilst energy values falling below the Stoll curve are less likely to cause second-degree
burns.
4 Requirements
4.1 Materials
4.1.1 Fabric
4.1.1.2 Flame retardancy
The flame retardancy of fabrics shall meet the requirements of Table 2, before washing
and after washing, according to the washing procedures specified in 5.3.
4.1.1.3 Physical and chemical properties
The physical and chemical properties of the fabric shall meet the requirements in Table
3.The technical requirements for "woven fabrics" or "knitted fabrics" are not marked
in the Table and are applicable to all types of fabrics.
4.1.3 Sewing thread
4.1.3.1 Strength
The single thread strength of the sewing thread shall not be less than 10 N.
4.1.3.2 Thermal resistance
The sewing thread has been tested for thermal resistance and shall be free of melting
and scorching.
4.1.4 Supporting materials and accessories
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.
4.5 Sewing
4.5.1 Stitch length
The stitch lengths of various sewing, buttonholing, buttoning stitches shall comply with
the requirements in Table 5.
5 Test methods
5.1 The arc thermal performance value and breakopen threshold of single-layer or
multi-layer arc flash protective clothing fabrics shall be tested, in accordance with the
provisions of Appendix B. During the testing, the arc thermal performance value and
breakopen threshold energy of the fabric shall be tested at the same time.
5.2 The unit area mass of arc flash protective clothing fabrics is tested according to
method 3 in GB/T 4669-2008.
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.
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.
5.16 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.
5.20 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.
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.
6.1.3 The instructions for use provided by the manufacturer shall comply with the
requirements of GB/T 5296.4-2012 and include but are not limited to the following.
6.1.4 The certificate shall include the 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, this document number, arc protection performance level and the lower
value of ATPV or EBT, washing method, production date, batch number, validity period,
manufacturer name, production address, exit-factory inspection certificate, etc.,
6.1.5 The graphic symbol of arc flash protective clothing shall be based on GB/T 20097,
in the form of Figure 1, with this this document number, arc protection performance
level, the lower value of ATPV or EBT marked below the graphic symbol.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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