SIST ENV 61112:2002
(Main)Blankets of insulating material for electrical purposes
Blankets of insulating material for electrical purposes
Applies to insulating blankets for the protection of workers from accidental contact with live or earthed electrical conductors, apparatus or circuits and avoidance of short circuits on a.c. and d.c. installations.
Abdecktücher aus isolierendem Material zum Arbeiten unter Spannung
Nappes en matériau isolant pour travaux électriques
S'applique aux nappes isolantes pour la protection des travailleurs contre un contact accidentel avec des conducteurs électriques sous tension ou mis à la terre, des appareils ou des circuits, et contre les court-circuits dans des installations à courant alternatif ou continu.
Blankets of insulating material for electrical purposes
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Blankets of insulating material for electrical purposesAbdecktücher aus isolierendem Material zum Arbeiten unter SpannungNappes en matériau isolant pour travaux électriquesBlankets of insulating material for electrical purposes13.260Protection against electric shock. Live workingICS:Ta slovenski standard je istoveten z:ENV 61112:2001SIST ENV 61112:2002en01-september-2002SIST ENV 61112:2002SLOVENSKI
STANDARD
SIST ENV 61112:2002
EUROPEAN PRESTANDARDENV 61112PRÉNORME EUROPÉENNEEUROPÄISCHE VORNORMJuly 2001CENELECEuropean Committee for Electrotechnical StandardizationComité Européen de Normalisation ElectrotechniqueEuropäisches Komitee für Elektrotechnische NormungCentral Secretariat: rue de Stassart 35, B - 1050 Brussels© 2001 CENELEC -All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.Ref. No. ENV 61112:2001 EICS 13.260English versionBlankets of insulating material for electrical purposes(IEC 61112:1992 + corrigendum 2000, modified)Nappes en matériau isolant pour travauxélectriques(CEI 61112:1992 + corrigendum 2000,modifiée)Abdecktücher aus isolierendem Materialzum Arbeiten unter Spannung(IEC 61112:1992 + Corrigendum 2000,modifiziert)This European prestandard was approved by CENELEC on 2001-03-24 as a prospective standard forprovisional application. The period of validity of this ENV is limited initially to three years. After two yearsthe members of CENELEC will be requested to submit their comments, particularly on the questionwhether the ENV can be converted into a European Standard (EN).CENELEC members are required to announce the existence of this ENV in the same way as for an ENand to make the ENV available promptly at national level in an appropriate form. It is permissible to keepconflicting national standards in force (in parallel to the ENV) until the final decision about the possibleconversion of the ENV into an EN is reached.CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,Portugal, Spain, Sweden, Switzerland and United Kingdom.SIST ENV 61112:2002
ENV 61112:2001- 2 -ForewordThe text of the International Standard IEC 61112:1992 + corrigendum May 2000, prepared byIEC TC 78, Tools for live working, together with the common modifications prepared by theTechnical Committee CENELEC TC 78, Equipment and tools for live working, was submitted tothe CENELEC questionnaire and vote procedure and was approved by CENELEC asENV 61112 on 2001-03-24.The following date was fixed:-latest date by which the existence of the ENVhas to be announced at national level(doa)2001-07-01Annexes designated "normative" are part of the body of the prestandard.Annexes designated "informative" are given only for information.In this prestandard, annexes A, B, C, D, E and ZA are normative, annexes F, and G areinformative.Annex ZA has been added by CENELEC.SIST ENV 61112:2002
- 3 -ENV 61112:2001Endorsement noticeThe text of the International Standard IEC 61112:1992 + corrigendum May 2000 was approvedby CENELEC as a European Prestandard with agreed common modifications as given below.COMMON MODIFICATIONSContentsAdd "and tolerances" to the title of 6.2.Replace the title of 8.5 by "Category M: Mechanical puncture resistance".Add "(normative)" after annex A, annex B, annex C, annex D and annex E.Add "(informative)" after annex F and annex G.Add a new annex ZAAnnex ZA (normative) - Normative references to international publications with theircorresponding European publications1Scope1.1Replace the text by:Six classes of blankets differing in electrical characteristics, are provided anddesignated as class 00, class 0, class 1, class 2, class 3 and class 4.2 Normative referencesReplace by:NOTE
Normative references to International publications are listed in annex ZA (normative).3Definitions3.6Replace "nominal voltage" by "nominal voltage of a system".3.8Replace by:3.8proof testa test during which a specified voltage is applied to a device for the time definedunder specified conditions to assure that the electrical strength of the insulation isabove the specified value3.12Replace by:3.12withstand testa test during which the device must withstand without flashover, disruptivedischarge, puncture or other electric failure a voltage applied under specifiedconditionsSIST ENV 61112:2002
ENV 61112:2001- 4 -Add:3.13usable areathe blanket area that protects the worker against electric shock and that is verifiedby the proof test4Add at the end of the paragraph: « They should not reduce the electrodeclearance ».5ClassificationReplace the first line starting with a dash by:-
by class as class 00, class 0, class 1, class 2, class 3 and class 4;Replace the second paragraph by:Guidance for the selection of class is given in annex E.Delete in Table 1, for M, "(higher level reinforced)".6Physical requirementsReplace 6.2, 6.3, including Table 3, and 6.4 by:6.2Dimensions and tolerancesRecommended dimensions for blankets are indicated in Table 2.Table 2 - Recommended dimensions for blanketsPlain blanketSlotted blanketBlanket in rollslengthmmwidthmmlengthmmwidthmmwidthmm910
560
910
910
2 280
305
560
690
910
910
-
560
910
-
1 160
-
560
910
-
1 160
60*, 90*, 1 000, 1 300,2 000* To be produced in class 00 and class 0 onlyPermissible variations in length and width shall be ± 15 mm except for the1 160 mm x 1 160 mm slotted size for wich the permissible variation is ± 25 mm.Permissible variations for rolls of 60 mm and 90 mm in width shall be ± 2 mmFor blankets with dimensions different from those recommended in Table 2,tolerances of ± 2 % are required.6.3Thickness6.3.1The maximum thickness of a blanket shall be limited in order to obtainappropriate flexibility and in order to pass the test defined in 7.6.2 (low temperaturetest).SIST ENV 61112:2002
- 5 -ENV 61112:20016.3.2The minimum thickness shall be determined only by the ability to pass thetests defined in clauses 7 and 8.6.4Workmanship and finishBlankets shall be free on both surfaces from harmful physical irregularities that canbe detected by the tests carried out according to this prestandard.Harmful and non-harmful physical irregularities are described in annex G (In-service recommendations).Add at the end of the subclause:« Where eyelets are present, they should not reduce the electrode clearance ».6.5Replace 6.5.1 by:6.5.1Each blanket which is claimed to comply with the requirements of thisPrestandard shall be marked at least on one surface with the following:a)symbol (double triangle) (see annex A);b)name, trademark, or identification of the manufacturer;c)category, if applicable;d)size (length and width);e)class designation;f)month and year of manufacture;g)usable area (see Figures 1 and 2), except for class 00 and class 0. (On rollsthe usable area shall be marked along the two sides only).In addition each blanket shall have a group of rectangles or other suitable meansto identify when the blanket was put into service and the dates of periodicinspection and testing.The usable area shall be visibly and permanently identified, for example by a linearound the usable area which has a minimum thickness of 3 mm.In the case of rolls, they shall bear on one border at least every metre all the abovemarkings, except d).6.5.2Delete the second paragraph.6.5.4Add "and of the limit of usable area" after "(double triangle)".Add in the second paragraph "Class 00 - beige".6.6Replace in the first paragraph "an individual container or package" by "containersor packages".Add after the first paragraph:Instructions for use shall be included in the package.7Tests on blankets7.1Replace in the second paragraph the word "clauses" by "subclauses".SIST ENV 61112:2002
ENV 61112:2001- 6 -Replace the last three paragraphs by:The test location conditions shall be in accordance with IEC 60160, clause 4(temperature from 15 °C to 35 °C and relative humidity from 45 % to 75 %).Unless otherwise specified, blankets shall be conditioned for a period of 2 h ± 0,5 hat a temperature of 23 °C ± 2 °C and relative humidity of 50 % ± 5 % (seeIEC 60212, standard atmosphere B).Conditioning shall be performed on complete blankets or on test pieces.Unless otherwise specified, the tolerances for any measured value shall be ± 5 %.In case of rolls having a width less than 150 mm, the test piece shall have onedimension equal to the width.Samples, units and test pieces submitted to non destructive tests can be re-usedfor other tests. Samples, units and test pieces submitted to destructive tests shallbe scrapped.7.2.3Replace by "Void".7.2.5Replace the text by:Type test and routine test (see 6.5)The marking shall be verified by visual inspection and durability test for type test.(« visual inspection » means inspection by a person with normal vision withoutadditional magnification). No durability test is required for routine test.The durability of the marking is checked by rubbing the marking for 15 s with apiece of lint-free cloth soaked in soapy water and then rubbing it for a further 15 swith a piece of lint-free cloth soaked in ethyl alcohol.
At the end of the test, themarking shall remain legible.7.3.2Replace the last paragraph before the notes by:The average of the four test pieces shall not be less than 150 %.7.3.3Add in the first paragraph "(max. 25 mm)", after "6 mm".Replace in the last paragraph "class 0" by "class 00 or class 0".Add a note at the end of the subclause:NOTE
The test procedure and the proposed values are under consideration.7.3.4Replace the first sentence by:This test applies only to blankets made of elastomer.7.3.5Delete the second sentence of the second paragraph.SIST ENV 61112:2002
- 7 -ENV 61112:20017.4.1Replace the text by:Dielectric testing shall be carried out either at a.c. or d.c. voltage. The choice of a.c.or d.c. shall be made between manufacturer and customer.NOTE
The equivalence of d.c. tests and a.c. tests is under consideration. The values of d.c. testvoltages are under consideration.For type tests three blankets are used. For routine tests one blanket is sufficient.For sampling tests the number is given in annex D (sample size).The peak (crest) or r.m.s. value of the a.c. voltage shall be measured with an errorof not more than 3 % (IEC 60060-3).For type and sampling tests the blankets shall be conditioned for moistureabsorption by total immersion in a bath of tap water at room temperature, asspecified in 7.1, for a period of 16 h ± 0,5 h.
Insulating compounds used in thefinishing process ( e.g. paraffin and talcum powder) should be removed before thetest is commenced with suitable solvents. After the conditioning the blanket shallbe wiped and immediately submitted to the dielectric test.For routine tests such conditioning is not required.Electrodes shall be of such design so as to apply the electrical stress uniformlyover the test area without producing corona at any point or mechanical strain in thematerial.Table 4Delete.7.4.2.1Replace by:7.4.2.1For proof testThe ground electrode is a metal plate having dimensions exceeding at least by20 mm on each side the dimensions of the blanket under test.In case of tests on rolls the ground electrode shall be able to contain at least alength of blanket equal to its width.The live electrode is a conductive plate, having smoothly rounded edges (3 mmradius) and corners (4,5 mm radius), of a size that covers and maximizes theusable area.The blanket under test is placed over the ground electrode, while the live electrodeis placed over the usable area. The full usable area shall be tested.In case of tests on class 00 and class 0 blankets clearance around the liveelectrode not exceeding 10 mm is permitted.7.4.2.2Replace by "Void".7.4.2.3Replace by:7.4.2.3For withstand testThe electrode shall consist of two metal cylinders with the sharp edges removed togive a radius of 3 mm. One electrode shall be 25 mm in diameter and 25 mm high.SIST ENV 61112:2002
ENV 61112:2001- 8 -The other electrode shall be 75 mm in diameter and 15 mm high. These electrodesshall be arranged coaxially as in Figure 7.7.4.4Replace by "Void".7.4.5Replace by:7.4.5
Electrical test procedures7.4.5.1
Test equipmentThe test equipment shall comply with IEC 60060-1.7.4.5.2
Proof test procedureType test, routine test and sampling testEach blanket shall be given a voltage test as specified in Table 3 using electrodesas specified in 7.4.2.1. The a.c. voltage shall be initially applied at a low value andgradually increased at a constant rate-of-rise of approximately 1 000 V/s until thespecified test voltage level is reached. The test period shall be considered to startat the instant the specified test voltage is reached. The test is deemed successful ifthe specified test voltage is reached and maintained for 3 min for the type andsampling tests and 1 min for the routine test without the occurrence of flashover,disruptive discharge, electrical puncture or other electrical failure.NOTE 1
At the end of the test period the applied voltage should be reduced at the above mentionedconstant rate to approximately half value before opening the test circuit unless an electrical failurehas already occured.NOTE 2
For continuous testing of blankets in roll form, the rate of voltage-rise and reduction shouldapply to the beginning and end of the roll under test.7.4.5.3
Withstand test procedureType test and sampling testFive test pieces having dimensions of 150 mm x 150 mm are cut from eachblanket.NOTE
In case of rolls having a width less than 150 mm, the test pieces will have the twodimensions equal to the width.The test pieces are placed between metallic electrodes as specified in 7.4.2.3 andthe whole arrangement is dipped in a liquid insulant (for instance, insulating oil).The test pieces shall not touch the wall of the tank.Only one voltage rise is applied to each test piece. The voltage shall be applied toeach test piece at a constant rate-of-rise of approximately 1 000 V/s until thewithstand voltage value given in Table 5 is reached. The voltage is immediatelyreduced at the above mentioned constant rate to approximately half value and thenthe test circuit is opened. The test is deemed successful if no electrical punctureoccurs.SIST ENV 61112:2002
- 9 -ENV 61112:20017.4.6Replace by “Void”.Replace Table 5 by:Table 3 - Test voltageClass of blanketsAC voltage r.m.s.kVProof testWithstand test00012342,55
10
20
30
40
510203040507.5Replace the first two paragraphs by:For elastomer, eight dumb-bell test pieces shall be cut as shown in Figure 3.For plastics, four dumb-bell test pieces shall be cut as shown in Figure 3 and fourmore test-pieces as shown in Figure 5.Replace in the sixth paragraph "three test pieces" by "four test pieces".7.6.2Replace the first sentence by:For the type test, three blankets or three units from the roll are used. For rolls theunit is a square with the side equal to the width of the roll itself.Replace in the last paragraph "proof voltage test" by "proof test".Add a new subclause:7.6.3
Compression test at high temperature(under consideration)8Tests on blankets with special properties8.2Replace the second and the third paragraphs by:Four test pieces of 150 mm x 150 mm shall be cut from the blankets of category Aand shall be conditioned by immersing in 32 ° Baumé sulphuric acid solution at atemperature of 23 °C ± 2 °C for 8 h ± 0,5 h. Following acid conditioning, the testspieces shall be rinsed in water and dried for 2 h ± 0,5 h at approximately 70 °C.Time elapsed between end of drying and start of testing shall be 45 min ± 15 min.Tests shall then be carried out on three test pieces for withstand tests according to7.4.2.3 but without conditioning for moisture absorption and on one test piece fortensile strength and elongation at break of the mechanical tests (see 7.3.2). Thevalues obtained for the mechanical tests shall not be less than 75 % of valuesobtained in the tests carried out on a sample from the same batch without acidconditioning.SIST ENV 61112:2002
ENV 61112:2001- 10 -8.3Replace the second and the fifth paragraphs by:Four test pieces of 150 mm x 150 mm shall be cut from the blankets of category Hand shall be preconditioned in air for not less than 3 h ± 0,5 h at 23 °C ± 2 °C, and50 % ± 5 % relative humidity, then shall be conditioned by immersing in oil N° 1(see annex B) at a temperature of 70 °C ± 2 °C for 24 h ± 0,5 h.Tests shall then be carried out on three test pieces for withstand tests according to7.4.2.3 but without conditioning for moisture absorption and on one test piece fortensile strength and elongation at break of the mechanical tests (see 7.3.2). Thevalues obtained for the mechanical tests shall not be less than 50 % of valuesobtained in the tests carried out on a sample from the same batch without acidconditioning.8.4Replace by:A test piece from the blanket of category Z of 12 mm x 100 mm shall beconditioned at an extension of 20 % in an oven for 8 h ± 0,5 h at a temperature of40 °C ± 2 °C and an ozone concentration of 1 mg/m³ ± 0,01 mg/m³(0,54 ppm ± 10 % by volume) at standard atmospheric pressure of 1 013 mbar(101,3 kPa).After completion of this test, the test piece shall exhibit no cracks under visualinspection.8.5Replace the title by "Category M: Mechanical puncture resistance".8.7Replace in the last paragraph "(see 7.4)" by "(see 7.4.5.2)".9Quality assurance plan and acceptance testReplace by:9.1
GeneralIn order to assure the delivery of products that meet this Prestandard, themanufacturer shall employ an approved quality assurance plan that complies withthe provisions of the ISO 9000 series.The quality assurance plan shall ascertain that the products meet the requirementscontained in this Prestandard.In the absence of an accepted quality assurance plan as specified above thesampling procedure detailed in annex D shall be carried out.9.2
Acceptance testsThe manufacturer shall keep for inspection by the customer, all test results inaccordance with the manufacturer's quality control procedures (see annex F).SIST ENV 61112:2002
- 11 -ENV 61112:2001Ann
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