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