DL/T 320-2019 PDF English
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DL/T 320-2019: Performance requirements of personal arc protective equipment---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/DLT320-2019
DL
ELECTRIC POWER INDUSTRY STANDARD
ICS 13.340
C 73
Replacing DL/T 320-2010
Performance requirements of personal arc protective
equipment
Issued on. JUNE 04, 2019
Implemented on. OCTOBER 01, 2019
Issued by. National Energy Administration
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Technical requirements... 9
5 Test methods... 15
6 Selection methods... 17
7 Quality inspection rules... 17
8 Use and maintenance... 20
9 Marking, instructions for use, storage and transportation... 21
Appendix A (Informative) Arc burn... 22
Appendix B (Informative) Conversion to imperial units of arc hazard energy... 23
Appendix C (Informative) Figures of personal arc protective equipment... 24
Appendix D (Normative) Risk assessment of arc hazard... 28
Appendix E (Informative) Arc hazard energy calculation methods and examples... 30
Bibliography... 39
1 Scope
This Standard specifies the technical requirements, test methods, selection methods,
quality inspection rules, use and maintenance as well as marking, instructions for use,
storage and transportation of personal arc protective equipment in electrical workplaces.
This Standard applies to the production, acceptance and use of personal arc protective
equipment in the electric power trade.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the dated version applies to this document. For
undated references, the latest edition (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 3609.1-2008, Occupational eye and face protection - Welding protection - Part
1.Welding protector
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 3922, Textiles - Tests for colour fastness - Colour fastness to perspiration
GB/T 3923.2, Textiles - Tensile properties of fabrics - Part 2.Determination of
maximum force using the grab method
GB/T 4669-2008, Textiles - Woven fabrics - Determination of mass per unit length
and mass per unit area
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
arc hazard
Personal injury or damage to equipment caused by the energy released by the arc.
3.2
arc hazard energy
Energy released by the arc and received over the test distance.
3.3
arc burn
Compound burns to the human body – caused by the powerful arc light generated when
electric current passes through the air medium or the circuit is short-circuited – within
its injuring distance. Thermal burn caused by arc flash and electrical burn caused when
electric current breaks down and enters the human body are included. See Appendix A
for grading of burn severity. This Standard applies to the prevention of thermal burn.
3.4
arc protection
Protection which is taken – when an arc occurs, by blocking the incident arc hazard
energy – to reduce the possible harm of the arc to the human body, so that the residual
energy is not enough to cause second-degree or above burns to the human body.
3.5
arc thermal performance value; ATPV
Value characterized by 50% chance that the energy incident on the arc protection
material will cause heat energy to penetrate the material and cause second-degree burns
(judged based on the Stohr curve). When the external incident energy is less than this
value, the material can effectively block and reduce the transmitted energy to avoid
causing second-degree and above burns to the human body.
4 Technical requirements
4.1 Performance of personal arc protective materials
4.1.1 Performance of protective fabrics
4.1.2 Performance of protective face shield
4.1.2.1 Arc protection performance
The arc protection performance of personal arc protective face shield materials (referred
to as face shield) shall be tested according to the method specified in 5.2, and shall meet
the requirements for arc protection performance ATPV in Table 3.
4.1.2.2 Shock resistance
The shock resistance of the face shield shall be tested according to the method specified
in 6.8 of GB/T 3609.1-2008.After the test, there shall be no flying debris and the lens
shall not be damaged.
4.2 Design and performance requirements for personal arc protective equipment
4.2.1 General requirements
Personal arc protective equipment shall meet the requirements of wearing comfort
while ensuring protection. It shall have corporate marking, name tag and other patches,
where metal parts are strictly prohibited. See Appendix C for sample diagrams.
4.2.2 Design and performance requirements for arc protective garment
4.2.3 Design and performance requirements for arc protective face shield and arc
protective hood
4.2.4 Design and performance requirements for arc protective gloves and arc
protective shoes cover
The design and performance of arc protective gloves (referred to as gloves) and arc
protective shoes cover (referred to as shoes cover) shall comply with the requirements
in Table 7.
5 Test methods
5.1 Fabric arc protection performance test
5.1.1 Test sample and preparation
5.1.1.1 Requirements for test sample
Before testing the arc protection performance of fabrics, ensure that the fabrics pass the
flame-retardant property test.
5.1.2 Test process
5.1.2.1 Requirements for the number of samples and valid data points
For ATPV testing of fabric samples, at least 7 groups of samples shall be used. During
the test, different incident energies are obtained by adjusting the arc duration. During
the ATPV calculation, the number of valid data points for incident energy shall not be
less than 21.
5.2 Face shield arc protection performance test
5.2.1 Face shield material arc protection performance test
The face shield material arc protection performance test shall be carried out on at least
24 material samples.
5.2.2 Evaluation and verification of overall protection performance of head shield
and hood
6 Selection methods
6.1 Selection principles
6.1.1 Principles for configuring protective equipment
Anyone entering an electrical workplace should be configured with protective
equipment if the person may face arc energy greater than 25.1 J/cm2 after arc risk
analysis or the place may have arc hazard.
6.2 Equipment requirements
6.2.1 Requirements for arc protection performance of personal arc protective
equipment
The arc protection performance of personal arc protective equipment (characterized by
ATPV and Ebt arc values) shall be higher than the arc hazard level of the workplace.
7 Quality inspection rules
7.1 Type test
7.1.1 Scope of application
Type test shall be carried out under the following circumstances.
7.1.2 Test items
Type test items are shown in Table 9.
7.2 Exit-factory test
7.2.1 Batching rules
Products of the same batch of raw materials and the same process conditions shall be
grouped into one batch.
8 Use and maintenance
8.1 Inspection before use
Inspection contents before use are as follows.
8.2 Cleaning and requirements during use
Cleaning and requirements during use are as follows.
9 Marking, instructions for use, storage and transportation
9.1 Marking
The marking shall include the following.
9.2 Instructions for use
Instructions for use shall at least include correct use, care and maintenance methods.
9.3 Storage
The product shall be stored in a dry and ventilated place, away from direct sunlight, and
must not be mixed with corrosive items.
DL/T 320-2019
DL
ELECTRIC POWER INDUSTRY STANDARD
ICS 13.340
C 73
Replacing DL/T 320-2010
Performance requirements of personal arc protective
equipment
Issued on. JUNE 04, 2019
Implemented on. OCTOBER 01, 2019
Issued by. National Energy Administration
Table of Contents
Foreword... 3
1 Scope... 5
2 Normative references... 5
3 Terms and definitions... 6
4 Technical requirements... 9
5 Test methods... 15
6 Selection methods... 17
7 Quality inspection rules... 17
8 Use and maintenance... 20
9 Marking, instructions for use, storage and transportation... 21
Appendix A (Informative) Arc burn... 22
Appendix B (Informative) Conversion to imperial units of arc hazard energy... 23
Appendix C (Informative) Figures of personal arc protective equipment... 24
Appendix D (Normative) Risk assessment of arc hazard... 28
Appendix E (Informative) Arc hazard energy calculation methods and examples... 30
Bibliography... 39
1 Scope
This Standard specifies the technical requirements, test methods, selection methods,
quality inspection rules, use and maintenance as well as marking, instructions for use,
storage and transportation of personal arc protective equipment in electrical workplaces.
This Standard applies to the production, acceptance and use of personal arc protective
equipment in the electric power trade.
2 Normative references
The following referenced documents are indispensable for the application of this
document. For dated references, only the dated version applies to this document. For
undated references, the latest edition (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 3609.1-2008, Occupational eye and face protection - Welding protection - Part
1.Welding protector
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 3922, Textiles - Tests for colour fastness - Colour fastness to perspiration
GB/T 3923.2, Textiles - Tensile properties of fabrics - Part 2.Determination of
maximum force using the grab method
GB/T 4669-2008, Textiles - Woven fabrics - Determination of mass per unit length
and mass per unit area
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
arc hazard
Personal injury or damage to equipment caused by the energy released by the arc.
3.2
arc hazard energy
Energy released by the arc and received over the test distance.
3.3
arc burn
Compound burns to the human body – caused by the powerful arc light generated when
electric current passes through the air medium or the circuit is short-circuited – within
its injuring distance. Thermal burn caused by arc flash and electrical burn caused when
electric current breaks down and enters the human body are included. See Appendix A
for grading of burn severity. This Standard applies to the prevention of thermal burn.
3.4
arc protection
Protection which is taken – when an arc occurs, by blocking the incident arc hazard
energy – to reduce the possible harm of the arc to the human body, so that the residual
energy is not enough to cause second-degree or above burns to the human body.
3.5
arc thermal performance value; ATPV
Value characterized by 50% chance that the energy incident on the arc protection
material will cause heat energy to penetrate the material and cause second-degree burns
(judged based on the Stohr curve). When the external incident energy is less than this
value, the material can effectively block and reduce the transmitted energy to avoid
causing second-degree and above burns to the human body.
4 Technical requirements
4.1 Performance of personal arc protective materials
4.1.1 Performance of protective fabrics
4.1.2 Performance of protective face shield
4.1.2.1 Arc protection performance
The arc protection performance of personal arc protective face shield materials (referred
to as face shield) shall be tested according to the method specified in 5.2, and shall meet
the requirements for arc protection performance ATPV in Table 3.
4.1.2.2 Shock resistance
The shock resistance of the face shield shall be tested according to the method specified
in 6.8 of GB/T 3609.1-2008.After the test, there shall be no flying debris and the lens
shall not be damaged.
4.2 Design and performance requirements for personal arc protective equipment
4.2.1 General requirements
Personal arc protective equipment shall meet the requirements of wearing comfort
while ensuring protection. It shall have corporate marking, name tag and other patches,
where metal parts are strictly prohibited. See Appendix C for sample diagrams.
4.2.2 Design and performance requirements for arc protective garment
4.2.3 Design and performance requirements for arc protective face shield and arc
protective hood
4.2.4 Design and performance requirements for arc protective gloves and arc
protective shoes cover
The design and performance of arc protective gloves (referred to as gloves) and arc
protective shoes cover (referred to as shoes cover) shall comply with the requirements
in Table 7.
5 Test methods
5.1 Fabric arc protection performance test
5.1.1 Test sample and preparation
5.1.1.1 Requirements for test sample
Before testing the arc protection performance of fabrics, ensure that the fabrics pass the
flame-retardant property test.
5.1.2 Test process
5.1.2.1 Requirements for the number of samples and valid data points
For ATPV testing of fabric samples, at least 7 groups of samples shall be used. During
the test, different incident energies are obtained by adjusting the arc duration. During
the ATPV calculation, the number of valid data points for incident energy shall not be
less than 21.
5.2 Face shield arc protection performance test
5.2.1 Face shield material arc protection performance test
The face shield material arc protection performance test shall be carried out on at least
24 material samples.
5.2.2 Evaluation and verification of overall protection performance of head shield
and hood
6 Selection methods
6.1 Selection principles
6.1.1 Principles for configuring protective equipment
Anyone entering an electrical workplace should be configured with protective
equipment if the person may face arc energy greater than 25.1 J/cm2 after arc risk
analysis or the place may have arc hazard.
6.2 Equipment requirements
6.2.1 Requirements for arc protection performance of personal arc protective
equipment
The arc protection performance of personal arc protective equipment (characterized by
ATPV and Ebt arc values) shall be higher than the arc hazard level of the workplace.
7 Quality inspection rules
7.1 Type test
7.1.1 Scope of application
Type test shall be carried out under the following circumstances.
7.1.2 Test items
Type test items are shown in Table 9.
7.2 Exit-factory test
7.2.1 Batching rules
Products of the same batch of raw materials and the same process conditions shall be
grouped into one batch.
8 Use and maintenance
8.1 Inspection before use
Inspection contents before use are as follows.
8.2 Cleaning and requirements during use
Cleaning and requirements during use are as follows.
9 Marking, instructions for use, storage and transportation
9.1 Marking
The marking shall include the following.
9.2 Instructions for use
Instructions for use shall at least include correct use, care and maintenance methods.
9.3 Storage
The product shall be stored in a dry and ventilated place, away from direct sunlight, and
must not be mixed with corrosive items.
......
Source: Above contents are excerpted from the full-copy PDF -- translated/reviewed by: www.ChineseStandard.net / Wayne Zheng et al.
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