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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/DLT320-2019DL 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 ContentsForeword... 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... 391 ScopeThis 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 referencesThe 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 area3 Terms and definitionsFor 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 requirements4.1 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 methods5.1 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 hood6 Selection methods6.1 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 rules7.1 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 maintenance8.1 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 transportation9.1 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 AdministrationTable of ContentsForeword... 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... 391 ScopeThis 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 referencesThe 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 area3 Terms and definitionsFor 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 requirements4.1 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 methods5.1 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 hood6 Selection methods6.1 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 rules7.1 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 maintenance8.1 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 transportation9.1 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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