Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in 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. The following parts of GB 8965 have been issued:
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by and is under the jurisdiction of the Ministry of Emergency Management of the People's Republic of China.
Introduction
In the working environment, the typical forms of flame and thermal damages include direct contact with flame, contact with flame and high-temperature solid during the welding, contact with all kinds of splashed molten metal, and thermal damage caused by electric arc discharge. Different flame and thermal damages have different action forms and characteristics, so different demands are put forward for body protection, and the protective clothing is divided into different types. On the basis of considering the application requirements and technical status of different types of flame and thermal damage protection products at home and abroad, this document specifies the technical requirements for the main types of protective clothing. The prepared GB 8965 series product standards will be composed of four parts.
——Part 1: Flame retardant protective clothing, Aiming to specify the technical requirements of protective clothing used in place with open fire, send-out spark, flammable material or exposed to flashover risk.
——Part 2: Protective clothing for welders, Aiming to specify the technical requirements of protective clothing used in welding and related working places.
——Part 3: Clothing to protect against molten metal splash, aiming to specify the technical requirements of protective clothing used in metal smelting and casting places and other places exposed to molten metal splash risk, so as to avoid or reduce the damage caused by molten metal to operators.
——Part 4: Arc flash protective clothing, aiming to specify the technical requirements of protective clothing that may suffer from transient arc energy and thermal damage in protective electrical and related working places.
This document specifies the requirements, marking and packaging and describes the test methods of arc flash protective clothing used in electrical and related working places.
This document is applicable to the protective clothing that may suffer from transient arc energy and thermal damage in protective electrical and related working places.
This document is not applicable to insulating protective clothing, electromagnetic protective clothing and shielding clothing for live working used in electrical and related working places.
This document is not include personal arc protective equipment such as arc protective face shield, arc protective hood, arc protective gloves and arc protective shoes cover.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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: Fibre and yarn
GB/T 3291.2 Textiles - Terms of textile material properties and test - Part 2: Fabric
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 colour fastness - Colour fastness to rubbing
GB/T 3921 Textiles - Tests for colour fastness - Colour fastness to washing with soap or soap and soda
GB/T 3922 Textiles - Tests for colour fastness - Colour fastness to perspiration
GB/T 3923.1 Textiles - Tensile properties of fabrics - Part 1: Determination of maximum force and elongation at maximum force using the strip method
GB/T 4669-2008 Textiles - Woven fabrics - Determination of mass per unit length and mass per unit area
GB/T 4802.1 Textiles - Determination of fabric propensity to surface fuzzing and to pilling - Part 1: Circular locus method
GB/T 4802.3 Textiles - Determination of fabric propensity to surface fuzzing and to pilling - Part 3: Pilling box method
GB/T 5296.4-2012 Instructions for use of products of consumer interest - Part 4: Textiles and apparel
GB/T 5455-2014 Textiles - Burning behaviour - Determination of damaged length, afterglow time and afterflame time of vertically oriented specimens
GB/T 7573 Textiles - Determination of pH of aqueous extract
GB/T 7742.1 Textiles - Bursting properties of fabrics - Part 1: Hydraulic method for determination of bursting strength and bursting distension
GB/T 8628 Textiles - Preparation, marking and measuring of fabric specimens and garments in tests for determination of dimensional change
GB/T 8629-2017 Textiles - Domestic washing and drying procedures for textile testing
GB/T 8630 Textiles - Determination of dimensional change in washing and drying
GB/T 12704.1 Textiles - Test method for water-vapour transmission of fabrics - Part 1: Desiccant method
GB/T 12903 Personal protective equipment terminology
GB/T 13640 Size designation of protective clothing
GB/T 17592 Textiles - Determination of the banned azo colourants
GB 18401-2010 National general safety technical code for textile products
GB/T 18885-2020 Technical specifications of ecological textiles
GB/T 20097 Protective clothing - General requirements
GB 20653 Protective clothing - High visibility warning clothing for professional use
GB/T 21294 Testing methods of physical and chemical performance of garments
GB/T 23344 Textiles - Determination of 4-aminoazobenzene
FZ/T 70007 Method of test for determining the underarm seam strength of knitted garments
FZ/T 81007 Casual wear
AATCC 135-2018 Dimensional changes of fabrics after home laundering
ASTM D1776/D1776M-20 Standard practice for conditioning and testing textiles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 12903, GB/T 3291.1~3291.3, GB 8965.1-2020 and the following apply.
3.1
electric arc
instantaneous spark and energy generated when the current passes through some insulating media (such as air)
Note: Electric arc is a gas discharge phenomenon.
3.2
arc hazard
personal injury or equipment damage caused by energy released by the arc
3.3
arc flash protective clothing
protective clothing used to protect human body and limbs that may be exposed to electric arc or related thermal hazards
3.4
arc hazard energy
superposition obtained by using instantaneous arc voltage multiplied by instantaneous arc current and arc release incremental time
3.5
Stoll curves
standard curve for predicting the relationship between the time and the thermal energy to reach the second-degree burns
Note: If the energy value is above the Stoll curve, it is easy to cause second-degree burns; if the energy value is below the Stoll curve, it is hard to cause second-degree burns.
[Source: GB/T 38302-2019, 3.3]
3.6
arc thermal performance value; ATPV
energy value indicating that the energy incident on the material has a 50% possibility of causing enough heat to pass through the test sample and leads to second-degree burns according to the Stoll curve
Note 1: The arc thermal performance value is one of the indicators to reflect the arc protective performance of materials, expressed in cal/cm2.
Note 2: The conversion equation of arc hazard energy unit from English unit to metric unit is 1cal/cm2 = 4.19J/cm2.
3.7
breakopen
reaction (phenomenon) in which one or more hole(s) are formed in the material, the thermal energy may pass through the material via the hole(s)
Note: In case of a hole with an area greater than 1.6cm2 or a length greater than 2.5cm in any direction, the sample is considered to be broken. A single yarn crossing an opening or hole does not affect the evaluation result of hole size. During the sample test of multi-layer flame-retardant materials, the sample shall not be regarded having been broken until all layers are broken. During the test of multi-layer sample, if some layers are flammable, when these flammable layers are exposed, the sample is considered to be broken.
3.8
breakopen threshold energy
EBT
energy value indicating that the energy incident on the material has a 50% possibility of causing material breakopen
Note: The breakopen threshold energy is one of the indicators to reflect the arc protective performance of materials, expressed in cal/cm2.
3.9
arc rating
protective performance of materials when exposed to arc release
Note: The arc rating is determined by the ATPV or EBT (whichever is lower) of the material (see Table 1), which is used to define the arc protective performance grade of the material.
Foreword i Introduction ii 1 Scope 2 Normative references 3 Terms and definitions 4 Requirements 5 Test methods 6 Marking and packaging Annex A (Informative) Calculation method and example of arc hazard energy Annex B (Nominative) Test methods of arc protective performance of outer shell Bibliography
Foreword
Codeofchina.com is in charge of this English translation. In case of any doubt about the English translation, the Chinese original shall be considered authoritative.
This document is developed in accordance with the rules given in 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. The following parts of GB 8965 have been issued:
——GB 8965.1-2020 Protective clothing - Flame retardant protective clothing;
——GB 8965.2-2022 Protective clothing - 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.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. The issuing body of this document shall not be held responsible for identifying any or all such patent rights.
This standard was proposed by and is under the jurisdiction of the Ministry of Emergency Management of the People's Republic of China.
Introduction
In the working environment, the typical forms of flame and thermal damages include direct contact with flame, contact with flame and high-temperature solid during the welding, contact with all kinds of splashed molten metal, and thermal damage caused by electric arc discharge. Different flame and thermal damages have different action forms and characteristics, so different demands are put forward for body protection, and the protective clothing is divided into different types. On the basis of considering the application requirements and technical status of different types of flame and thermal damage protection products at home and abroad, this document specifies the technical requirements for the main types of protective clothing. The prepared GB 8965 series product standards will be composed of four parts.
——Part 1: Flame retardant protective clothing, Aiming to specify the technical requirements of protective clothing used in place with open fire, send-out spark, flammable material or exposed to flashover risk.
——Part 2: Protective clothing for welders, Aiming to specify the technical requirements of protective clothing used in welding and related working places.
——Part 3: Clothing to protect against molten metal splash, aiming to specify the technical requirements of protective clothing used in metal smelting and casting places and other places exposed to molten metal splash risk, so as to avoid or reduce the damage caused by molten metal to operators.
——Part 4: Arc flash protective clothing, aiming to specify the technical requirements of protective clothing that may suffer from transient arc energy and thermal damage in protective electrical and related working places.
Protective clothing - Arc flash protective clothing
1 Scope
This document specifies the requirements, marking and packaging and describes the test methods of arc flash protective clothing used in electrical and related working places.
This document is applicable to the protective clothing that may suffer from transient arc energy and thermal damage in protective electrical and related working places.
This document is not applicable to insulating protective clothing, electromagnetic protective clothing and shielding clothing for live working used in electrical and related working places.
This document is not include personal arc protective equipment such as arc protective face shield, arc protective hood, arc protective gloves and arc protective shoes cover.
2 Normative references
The following documents contain requirements which, through reference in this text, constitute provisions of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
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: Fibre and yarn
GB/T 3291.2 Textiles - Terms of textile material properties and test - Part 2: Fabric
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 colour fastness - Colour fastness to rubbing
GB/T 3921 Textiles - Tests for colour fastness - Colour fastness to washing with soap or soap and soda
GB/T 3922 Textiles - Tests for colour fastness - Colour fastness to perspiration
GB/T 3923.1 Textiles - Tensile properties of fabrics - Part 1: Determination of maximum force and elongation at maximum force using the strip method
GB/T 4669-2008 Textiles - Woven fabrics - Determination of mass per unit length and mass per unit area
GB/T 4802.1 Textiles - Determination of fabric propensity to surface fuzzing and to pilling - Part 1: Circular locus method
GB/T 4802.3 Textiles - Determination of fabric propensity to surface fuzzing and to pilling - Part 3: Pilling box method
GB/T 5296.4-2012 Instructions for use of products of consumer interest - Part 4: Textiles and apparel
GB/T 5455-2014 Textiles - Burning behaviour - Determination of damaged length, afterglow time and afterflame time of vertically oriented specimens
GB/T 7573 Textiles - Determination of pH of aqueous extract
GB/T 7742.1 Textiles - Bursting properties of fabrics - Part 1: Hydraulic method for determination of bursting strength and bursting distension
GB/T 8628 Textiles - Preparation, marking and measuring of fabric specimens and garments in tests for determination of dimensional change
GB/T 8629-2017 Textiles - Domestic washing and drying procedures for textile testing
GB/T 8630 Textiles - Determination of dimensional change in washing and drying
GB 8965.1-2020 Protective clothing - Flame retardant protective clothing
GB/T 12704.1 Textiles - Test method for water-vapour transmission of fabrics - Part 1: Desiccant method
GB/T 12903 Personal protective equipment terminology
GB/T 13640 Size designation of protective clothing
GB/T 17592 Textiles - Determination of the banned azo colourants
GB 18401-2010 National general safety technical code for textile products
GB/T 18885-2020 Technical specifications of ecological textiles
GB/T 20097 Protective clothing - General requirements
GB 20653 Protective clothing - High visibility warning clothing for professional use
GB/T 21294 Testing methods of physical and chemical performance of garments
GB/T 23344 Textiles - Determination of 4-aminoazobenzene
FZ/T 70007 Method of test for determining the underarm seam strength of knitted garments
FZ/T 81007 Casual wear
AATCC 135-2018 Dimensional changes of fabrics after home laundering
ASTM D1776/D1776M-20 Standard practice for conditioning and testing textiles
3 Terms and definitions
For the purposes of this document, the terms and definitions given in GB/T 12903, GB/T 3291.1~3291.3, GB 8965.1-2020 and the following apply.
3.1
electric arc
instantaneous spark and energy generated when the current passes through some insulating media (such as air)
Note: Electric arc is a gas discharge phenomenon.
3.2
arc hazard
personal injury or equipment damage caused by energy released by the arc
3.3
arc flash protective clothing
protective clothing used to protect human body and limbs that may be exposed to electric arc or related thermal hazards
3.4
arc hazard energy
superposition obtained by using instantaneous arc voltage multiplied by instantaneous arc current and arc release incremental time
3.5
Stoll curves
standard curve for predicting the relationship between the time and the thermal energy to reach the second-degree burns
Note: If the energy value is above the Stoll curve, it is easy to cause second-degree burns; if the energy value is below the Stoll curve, it is hard to cause second-degree burns.
[Source: GB/T 38302-2019, 3.3]
3.6
arc thermal performance value; ATPV
energy value indicating that the energy incident on the material has a 50% possibility of causing enough heat to pass through the test sample and leads to second-degree burns according to the Stoll curve
Note 1: The arc thermal performance value is one of the indicators to reflect the arc protective performance of materials, expressed in cal/cm2.
Note 2: The conversion equation of arc hazard energy unit from English unit to metric unit is 1cal/cm2 = 4.19J/cm2.
3.7
breakopen
reaction (phenomenon) in which one or more hole(s) are formed in the material, the thermal energy may pass through the material via the hole(s)
Note: In case of a hole with an area greater than 1.6cm2 or a length greater than 2.5cm in any direction, the sample is considered to be broken. A single yarn crossing an opening or hole does not affect the evaluation result of hole size. During the sample test of multi-layer flame-retardant materials, the sample shall not be regarded having been broken until all layers are broken. During the test of multi-layer sample, if some layers are flammable, when these flammable layers are exposed, the sample is considered to be broken.
3.8
breakopen threshold energy
EBT
energy value indicating that the energy incident on the material has a 50% possibility of causing material breakopen
Note: The breakopen threshold energy is one of the indicators to reflect the arc protective performance of materials, expressed in cal/cm2.
3.9
arc rating
protective performance of materials when exposed to arc release
Note: The arc rating is determined by the ATPV or EBT (whichever is lower) of the material (see Table 1), which is used to define the arc protective performance grade of the material.
Contents of GB 8965.4-2022
Foreword i
Introduction ii
1 Scope
2 Normative references
3 Terms and definitions
4 Requirements
5 Test methods
6 Marking and packaging
Annex A (Informative) Calculation method and example of arc hazard energy
Annex B (Nominative) Test methods of arc protective performance of outer shell
Bibliography
