GB 12011-2000 General technical requirements for dielectric footwear

General technical requirements for dielectric footwearGB12011-2000Foreword: term 4.1.1, term 4.1.3.5, term 4.1.3.6, term 4.1.3.7, term 4.1.4, term 4.1.5.2, term 4.1.5.3, term 4.2, term 7.1 and term 7.4.2 are compulsory and othersare recommendatory.1.Scope:This standard specifies type, style, technical requirements, tests methods, tests rules, marks, packaging, storage, transportation and usage of dielectric footwear.This standard applies to dielectric footwear used as assistant safety tool when working on the electronic equipment.This standard doesn’t apply to insulating shoes made by single seam tactic.2.Cited standards: this standard also takes other relevant Chinese standard asreference.3.Type and style of shoesType:Divided according to the material of upper:a)Dielectric leather shoesb)Dielectric cloth canvas rubber shoesc)Dielectric rubber surface rubber shoesd)Dielectric plastic shoesStyleDivided according to the height of upper:a)Low upper dielectric footwear (picture 1)b)High upper dielectric footwear (picture 2)c)Half dielectric boots (picture 3)d)Dielectric boots (picture 4)4.Technical requirementsGeneral requirementStructureThere should be no metal parts in the sole or heel. If the inner toecap of the impact-proof dielectric footwear is made of metal material, the surface should go through insulating processing, and should be one whole part with the shoe without moving. When connecting upper and sole, not use seam straight through two parts; side seaming is acceptable.SizeConforms to GB/T3293.1.UpperSize of upper (height h): meet the minimum requirement in table 1.The thickness of upper: meet requirements in table 2Leather tear strength ≥60N/mm2Fabric breaking strength vertical≥980N; horizontal≥490N.Stretch performance: meet requirements in table 3Adhesion strength of upper and sole:no less than 2.0kN/m.Adhesion strength of upper and fabric: no less than 0.6kN/m.OutsoleThere should be anti-slip pattern for the outsole.The thickness of outsole.a)The thickness of outsole with anti-slip pattern is no less than 4mm. (excludethe pattern.)b)When the pattern can’t be measured, any thickness except shank should be noless than 6mm.Abrasion proof performance.The length of abrasion mark on the outsole of dielectric footwear is no more than 10mm; the consumption of dielectric canvas shoe is no more than 1.4cm3; the consumption of dielectric boots of 15kV and below is no more than 1.0cm3; the consumption of dielectric boots of 20kV and above is no more than 1.9cm3.Bending proof performanceThe outsole of nonleather requests for continuous bending of 40 000 times, with pre-shear orifice 5mm no more than 12mm or non-pre-shear orifice, 50 000 times, no break.The finished shoeAppearancea)Dielectric leather shoe: conforms to QB 1002, QB 1003 and QB1005.b)Dielectric canvas rubber shoe: conforms to HG/T 2495.c)Dielectric rubber boot: conforms to HG2401.LeakageWhen dielectric boots and boots with polymerization material are tested upon term 5.13 in this standard, there should be no leakage in the upper and outsole.Striping strengthStriping strength of dielectric leather shoe should be no less than 70N/cm.Requirement on electricity performanceDielectric leather shoe and dielectric canvas shoe: when the leakage current is 0.3 mA/kV, table 4 should be conformed to.Dielectric rubber boots and boots with polymerization material: when the leakage current is 0.4 mA/kV, table 5 should be conformed to.Table 5 Requirement on electricity performance of dielectric rubber boots and boots with5.Testing methods.Appearance inspectionDielectric leather shoes are tested upon GB/T 3903.5; HG/T 2495 for dielectric canvas shoe and HG 2401 for dielectric rubber boots.Determination of the height of upper: do upon GB/T 3903.5 –1994 table 1, no. 3.Determination of thickness of upper: do upon QB/T3812.4 for the thickness of the leather; for thickness of other material, use thickness gauge or vernier caliper (±0.02mm)Inspection of tear strength of leather upper: do upon GB/T 3812.6.Inspection of break strength of fabric upper: do upon GB/T 3923.1/Inspection of stretch of upper:QB/T 3812.5 for leather; GB/T528 for rubber; GB/T 1040 for plasticInspection of bending proof of upper: do upon GB/T 9341.Determination of thickness of outsole:Use measuring tools in the GB/T 3803.5-1994 and method in its table 1 no. 11.Inspection of abrasion proof performance of outsole.GB/T 3903.2 for dielectric leather shoe; GB/T 1689 for canvas and rubber boots Inspection of folding proof of outsole: do upon GB/T 3903.1.Striping strength: do upon GB/T 3903. 3.Adhesion strength of upper and sole; upper and fabric: do upon GB/T 532.LeakageSeal the top of rubber boots or boots with polymerization material, inject air into the boots, and when the air pressure reach 10 kPa±1kPa, dip into water; Distance between out waterline and the upper brim of boots is 75mm; observe whether there is bubble: without bubble means leakage performance conforms.Electricity performance:Inspection before leaving factory and preventive inspection of all dielectric footwear should be done upon appendix A; inspection of model, supervision sampling and certificating inspection should be done upon appendix B.6.Inspection rules.Inspection before factory:This inspection is done by QC department of manufacturer; testing items are as follows:a)Appearance: inspect the finished shoes by pair.b)Physical and mechanical performance: manufacturer choose 3 item from thefollowing: outsole bending proof, abrasion proof, stretch strength of rubber, striping of leather shoe, adhesion strength of upper and sole and do sampling inspection upon table 6: if unqualified, the this batch is regarded as unqualified.c)Electricity performance: inspect by pair, and put in stock except theunqualified one.Model inspection: full items inspection of products according to standard; and do this kind of inspection in one of the following situation:a)Design appraisal when produce new products or change the manufactures;b)After starting production, big changes like structure, material and techniquesthat may affect products performance.c)Periodical inspection every half year for normal production.d)Restart production after stopping for more than half year.e)When there is big difference between the inspection result in factory and lastinspection.f)When national quality supervision institute request.g)The sample should be from qualified products stock, and number should be3-5 pairs to meet testing items.7.Marks, package, transport and storage.Marks:Marks should include:a)There should be standard number, dielectric sign (e.g. EH1)in English),lightening sign and voltage number on the upper or outsole of each pair;b)There should be manufacturer, size, products or logo name, manufacturingdate and inspection qualified sign of dielectric performance.PackageEach pair should be packed in paper bag, plastic bag or paper box. There should be the following contents on package: products name (e.g. 6kV leather dielectric shoe etc), standard number, manufacturer, size, logo and instruction.The out package should be carton, and sealed well, bundles tightly, and should be following contents on the carton: standard number, manufacturer’s name and address, zip code, products name, products specification, quantity, logo, manufacturing date, carton number, size and volume (or weight).Transportation: there should be cover during transportation to prevent rain, and shouldn’t be kept together with acid, alkali and other corrosive articles.Storage:Place: keep in dry and ventilated warehouse, prevent from mildew. Store 20cm or above from ground and wall; 1m away from heating element. Avoid oil, acid, alkali or other corruptive articles.Duration: normally it is 24 months (since manufacturing date), after which products should be checked one by one of the preventive inspection of electricity performance; only shoes conforms to requirements in table 4 and 5 can be sold and used as dielectric shoes.age:Following rules should be obeyed:a)Dielectric leather shoe and canvas shoe which can bear 15kV or below voltage isapplicable for working voltage of 1kV or below; dielectric boots and boots with polymerization material which can bear 15kV or above voltage is applicable for working voltage of 1kV or above. When using, follow strictly safety rules ofelectricity industry (DL408 and DL409).b)Any working environment using dielectric leather shoe and canvas shoe shouldensure the dryness of shoe.c)Any dielectric footwear should avoid sharp, high temperature and corruptivesubstance, to avoid affecting electricity performance. If there is any damage or corruption of upper or sole, the shoe can’t be regarded as dielectric footwear.d)Shoes after preventive inspection should conform to requirement in table 4 and 5.Validity period of preventive inspection each time should be no more than 6 months.Appendix A---Testing methods A for electricity performance of dielectric shoes A1. ScopeThis appendix specifies testing principle, equipments, sample, methods, procedure and result of dielectric footwear’s electricity performance, which is applicable for inspection before leaving factory and preventive inspection.A2. Testing principleExert the voltage onto the in electrode and out electrode of the testing shoe; during regulated testing time, if the sample isn’t penetrated, then number shown on the millimeter (mA) is the leaking current, and number shown on the voltmeter (kV) is the voltage.A3. EquipmentsA3.1 testing transformer: transformer of more than 0.5 kV A (500V A).A3.2 voltmeter: accuracy is within level 1.5.A3.3 millimeter: accuracy is within level 1.0, and the use value is 15%-85% of the measuring range.A3.4 measuring system resistance: no more than 28×104Ω.A3.5 testing circuit: see following A1 circuit diagram.A4. SampleA4.1 the new shoe should be the finished products storing after 72h.A4.2 the used shoe should be cleaned and dried.A5. Testing conditionsA5.1 environment: temperature 20℃±5℃, and humidity—lower than 85%.A5.2 sample depositing time: no less than 1h in the environment in A5.1.A6. Testing methods.A6.1 put a metal piece consistent with testing shoe’s size into the shoe as in electrode, extend the metal balls (diameter no more than 4mm) on the metal piece, whose thickness is no less than 15mm. out electrode is the immersed sponge in the metal vessel. When testing the dielectric leather shoe and canvas shoe, put the shoe on the sponge, and the water level shouldn’t exceed the outsole.A6.2 raise the voltage from 0 to 75% of regulated voltage in the speed of 1kV/s, after that to the regulated voltage in the speed of 100 kV/s.A6.3 when voltage raise to the regulated testing voltage, keep for 1 minute, record the current shown on the millimeter, as accurate as 0.1 mA.A6.4 when the tests finishes, fall the pressure fast to 0, but not to shut off the power suddenly.A7. Testing results.All the tested shoes should conform to table 4 and 5.A8. Testing report.Should include:a)Name or reference of sample;b)Environment condition of testingc)Testing voltage, lasting time and leaking current;d)Tester;e)Testing dateAppendix B--- Testing methods B for electricity performance of dielectric shoes B1. ScopeThis appendix specifies testing principle, equipments, sample, methods, procedure and result of dielectric footwear’s electricity performance.This appendix applies to electricity performance model inspection, supervision sampling inspection and certificating inspection of all dielectric shoes.B2. PrincipleExert the voltage onto the in electrode and out electrode of the testing shoe (boots); during regulated testing time, if the sample isn’t penetrated, then number shown on the millimeter (mA) is the leaking current, and number shown on the voltmeter (kV) is the testing voltage.B3. Equipments (see picture B1)B3.1 in electrode: consists of sponge padding dipped with 1% sodium chloride solution, metal piece and metal ball with diameter no more than 4mm.B3.2 out electrode: consists of sponge and water.B3.3 testing transformer: transformer of more than 0.5 kV A (500V A).B3.4 voltmeter: accuracy is within level 1.5.B3.5 millimeter: accuracy is within level 1.0, and the use value is 15%-85% of the measuring range.B3.6 measuring system resistance: no more than 28×104Ω.Picture B1B4. SampleB4.1 the new boots should be the finished products storing after 72h.B4.2 the used boots should be cleaned and dried.B5. Testing conditionsB5.1 environment: temperature—20℃±5℃, and humidity—lower than 85%.B5.2 sample depositing time: no less than 1h in the environment in A5.1.B6. Testing procedure.B6.1 dip the sponge pad (thickness about 3mm), which is 65% total area of testing shoe’s sole, into 1% sodium chloride solution for 15-30s until the sponge is fully dipped, take out the sponge, and squeeze out redundant water till that water will not flows out from sponge pad.B6.2 put the sponge dipped with 1% sodium chloride solution into the testing shoe, and put on it the same size metal piece and metal balls (diameter no more than 4mm), whose thickness is no less than 15mm. After that put the testing shoe into the vessel with water and sponge. When testing the dielectric leather shoe and canvas shoe, thesponge shouldn’t soak the upper.B6.3 raise the voltage from 0 to 75% of regulated voltage in the speed of 1kV/s, after that to the regulated voltage in the speed of 100 kV/s. Keep for 1 minute, record the current shown on the millimeter, as accurate as 0.1 mA.B6.4 when the tests finishes, fall the pressure fast to 0, but not to shut off the power suddenly.B7. Testing results.All the tested boots should conform to table 4 and 5.B8. Testing report.Should include:a)Name or reference of sample;b)Environment condition of testingc)Testing voltage, lasting time and leaking current;d)Tester;e) Testing dateAppendix C---worldwide size and height of upper。