SIST EN 50340:2002
(Main)Hydraulic cable cutting devices - Devices to be used on electrical installations with nominal voltage up to AC 30 kV
Hydraulic cable cutting devices - Devices to be used on electrical installations with nominal voltage up to AC 30 kV
Corrigendum to EN issued February 2002
Hydraulische Kabelschneidgeräte - Geräte zur Verwendung an elektrischen Anlagen mit Nennwechselspannungen bis 30 kV
Dispositifs coupe câbles hydrauliques - Dispositifs à utiliser sur des installations électriques de tension nominale jusqu'à 30 kV en courant alternatif
Hidravlične naprave za rezanje kablov - Naprave za uporabo na električnih inštalacijah z nazivno izmenično napetostjo do 30 kV
General Information
Relations
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.NWULþQLKHydraulische Kabelschneidgeräte - Geräte zur Verwendung an elektrischen Anlagen mit Nennwechselspannungen bis 30 kVDispositifs coupe câbles hydrauliques - Dispositifs à utiliser sur des installations électriques de tension nominale jusqu'à 30 kV en courant alternatifHydraulic cable cutting devices - Devices to be used on electrical installations with nominal voltage up to AC 30 kV13.260Protection against electric shock. Live workingICS:Ta slovenski standard je istoveten z:EN 50340:2001SIST EN 50340:2002en01-september-2002SIST EN 50340:2002SLOVENSKI
STANDARD
SIST EN 50340:2002
EUROPEAN STANDARDEN 50340NORME EUROPÉENNEEUROPÄISCHE NORMOctober 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. EN 50340:2001 EICS 13.260; 29.240.20; 29.260.99English versionHydraulic cable cutting devices -Devices to be used on electrical installationswith nominal voltage up to AC 30 kVDispositifs coupe câbles hydrauliques -Dispositifs à utiliser sur des installationsélectriques de tension nominale jusqu'à30 kV en courant alternatifHydraulische Kabelschneidgeräte -Geräte zur Verwendung an elektrischenAnlagen mit Nennwechselspannungenbis 30 kVThis European Standard was approved by CENELEC on 2000-08-01. CENELEC members are bound tocomply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving thisEuropean Standard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained onapplication to the Central Secretariat or to any CENELEC member.This European Standard exists in three official versions (English, French, German). A version in anyother language made by translation under the responsibility of a CENELEC member into its ownlanguage and notified to the Central Secretariat has the same status as the official versions.CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands,Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.SIST EN 50340:2002
EN 50340:2001- 2 -ContentsForeword.41Scope.52Normative references .53Definitions.64Requirements.84.1General .84.2Cutting head .84.3Insulating hose .94.4Insulating hydraulic fluid .94.5Pump.94.6Safety valve .104.7Reverse flow valve .104.8Pressure gauge .104.9Hydraulic coupler .104.10Equipotential bonding and earthing system .104.11Marking.114.12Instructions for use .125Tests.125.1General .125.2Inspection, instructions for use and marking .125.3Test under pressure of the insulating hose and couplers .135.4Dielectric strength of the hydraulic fluid .135.5Hardness of the blade(s).135.6Leakage current of the insulating hose .135.7Test under stress .135.8Self-acting opening .145.9Accuracy of cutting .145.10Working force of the pump .155.11Slip resistance.155.12Operation of the safety valve .155.13Pressure strength of the device .165.14Functional tests .165.15Test on earthing system .176Quality assurance plan and acceptance tests .176.1 General .176.2 Sampling procedure .176.3 Acceptance tests .17SIST EN 50340:2002
- 3 - EN 50340:2001AnnexesAnnex A (normative)
Instructions for use .24Annex B (normative)
List of tests .26Annex C (normative)
Sampling plan .27Annex D (informative)
Acceptance tests .29Annex E (informative)
Background .30FiguresFigure 1 - Example of cable cutting device .18Figure 2 - Symbol “Double triangle“ .18Figure 3 - Test arrangement for measuring the leakage current .19Figure 4 - Tackle points to strain the blade (blades) .20Figure 5 - Working force of the pump - test arrangement .21Figure 6 - Slip resistance - test arrangement .22Figure 7 - Earthing system - test arrangement .23SIST EN 50340:2002
EN 50340:2001- 4 -ForewordThis European Standard was prepared by the Technical Committee CENELEC TC 78, Equipmentand tools for live working.The text of the draft was submitted to the Unique Acceptance Procedure and was approved byCENELEC as EN 50340 on 2000-08-01.The following dates were fixed:–latest date by which the EN has to be implementedat national level by publication of an identicalnational standard or by endorsement(dop)2002-05-01–latest date by which the national standards conflictingwith the EN have to be withdrawn(dow)2003-08-01Annexes designated "normative" are part of the body of the standard.Annexes designated "informative" are given for information only.In this standard, annexes A, B and C are normative and annexes D and E are informative.The cable cutting devices specified here are designed to protect the user while he is verifyingwhether the cable is dead.In some countries, it is necessary where the cable to be cut is live that the first action of thecutting device is to make, on a multi-phases cable, only a single-phase fault to earth so that theprotective devices of the network can operate on a single-phase fault.This standard specifies requirements and tests for these cable cutting devices.SIST EN 50340:2002
- 5 - EN 50340:20011ScopeThis standard is applicable to cable cutting devices to be used to verify that a cable is dead inaccordance with the rules given in EN 50110.Cable cutting devices specified in this standard are for use on systems with nominal voltage up to30 kV AC and nominal frequencies up to 60 Hz.For devices to be used on systems with nominal voltages above 30 kV AC this standard should beused as a guide but additional requirements and tests shall be agreed between manufacturer andcustomer to provide for an equivalent level of safety.These devices are not designed to be used on cables with special armour, or with steel wires orsteel tapes more than 1 mm in diameter or thickness.2Normative referencesThis European Standard incorporates by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revisions ofany of these publications apply to this European Standard only when incorporated in it byamendment or revision. For undated references the latest edition of the publication referred toapplies (including amendments).EN 12164+ A119982000Copper and copper alloys material - Rod for free machiningpurposesEN 501101996Operation of electrical installations.EN 60060–21994Part 2 : Measuring systems (IEC 60060-2:1994)EN 601561995Insulating liquids - Determination of the breakdown voltage atpower frequency - Test method (IEC 60156:1995)EN 612301995Live working : Portable equipment for earthing or earthing andshort-circuiting (IEC 61230:1993, mod.)HD 437 S11984Standard conditions for use prior and during the testing ofsolid electrical insulating materials (IEC 60212:1971)HD 588.1 S11991High-voltage test techniques - Part 1 : General definitions andtest requirements (IEC 60060-1:1989)IEC 60050-1511978International Electrotechnical Vocabulary – Chapter 151 :Electrical and magnetic devices.IEC 60050-6041987International Electrotechnical Vocabulary – Chapter 604 :Generation, transmission and distribution of electricity –OperationIEC 604101973Sampling plans and procedures for inspection by attributes.IEC 613181994Live working - Guidelines for quality assurance plans.ISO 14021994Rubber and plastic hoses and hose assemblies - HydrostatictestingSIST EN 50340:2002
EN 50340:2001- 6 -ISO 6507-11997Metallic materials – Vickers hardness test – Part 1: TestmethodISO 68031994Rubber or plastic hoses and hose assemblies - Hydraulic -pressure impulse test without flexingISO 8457-11989Steel wire rod - Part 1 : Dimensions and tolerancesISO 8457-21989Steel wire rod - Part 2 : Quality requirements for unalloyedsteel wire rods for conversion to wireISO 9000seriesQuality management systems3DefinitionsFor the purposes of this standard, the following definitions are applicable.3.1cable cutting devicea portable device which is used to cut cables in a safe manner. This device is used to verify that acable is dead at the work site.It consists of the following components (see Figure 1) :- a cutting head, this contains the cutting blade(s),- a hydraulic pump,- a length of insulating hose with fittings to connect the cutting head and the pump,- insulating hydraulic fluid,- an earthing system.3.2cutting headthat part (component) of the device which contains the cutting blade(s) and which is applied to thecable to be cut. The blade(s) is(are) operated by means of hydraulic pressure.3.3pumpthat part of the device which generates pressure in the insulating hydraulic fluid within the hose tooperate the cutting head.3.4insulating hosean insulating and pressure resistant hose used to connect the cutting head and the pump.3.5insulating hydraulic fluidfluid with suitable electrical insulating properties used to equalize the pressure between the pumpand the cutting head.SIST EN 50340:2002
- 7 - EN 50340:20013.6reverse flow valvea valve for manual operation which is designed and installed for the backflow of fluid from thepressure compartment to the storage compartment after having cut through the cable completely.3.7safety valvea valve designed and installed to release the pressure of fluid in the pressure compartment whenthe maximum operating pressure of the hydraulic system is reached, so that it protects the systemagainst overpressure.3.8hydraulic couplera fitting on the pump, the cutting head and at each end of the hose to permit connection of thesecomponents. The fitting is made in two mating parts. The coupler can be connected anddisconnected only under negligible pressure. The coupler shall be fluid tight and maintainconnection under the maximum operating pressure condition of the cable cutting device.NOTE
Some couplers can be separated by hand, others may require the use of a tool.3.9maximum operating pressurethe operating pressure specified by the manufacturer which shall not be exceeded during thefunctioning of the cable cutting device.3.10blade(s)metallic part(s) with a sharp edge or edges which is designed to penetrate the cable in such a waythat the cable will be cut into two separate parts.3.11earthing systemall those necessary connections, conductors and fittings used to ensure that the electricalpotential of an equipment is as close as practicable to the earth potential (i.e. at or about 0 V toearth) [IEV 604-04-02 Mod].3.12Tests3.12.1type testa test performed of one or more devices made to a certain design to show that the design meetscertain specifications [IEV 151-04-15].3.12.2routine testa test to which each individual device is subjected during or after manufacture to ascertainwhether it complies with certain criteria [IEV 151-04-16].SIST EN 50340:2002
EN 50340:2001- 8 -3.12.3sampling testa test performed on a number of devices taken at random from a batch [IEV 151-04-17].3.12.4acceptance testa contractual test to prove to the customer that the device meets certain conditions of itsspecification [IEV 151-04-20].4 Requirements4.1General4.1.1The device shall operate correctly and safely indoor, outdoor, under rain and with a rangeof ambient temperature between -20°C to +40°C.4.1.2The complete cable cutting device shall safely withstand the maximum operating pressure.4.1.3For cable cutting devices which can be dismantled, suitable means for the storage andtransportation of the separate components shall be provided. These means shall be designed toprevent damage to the component parts in transit and pollution/contamination of all the insulatingparts(i.e. hydraulic fluid, hoses).4.2Cutting head4.2.1The design of the cutting head shall be such that it can be transported in a safe mannerand is safe and easy to locate on a cable.4.2.2The mass of the cutting head shall not exceed 20 kg so that it can be safely and readilyoperated by one person.4.2.3The cutting head shall be designed so that when properly applied, it shall not be displacedduring a cutting operation except when a short circuit fault occurs.4.2.4The cutting head shall be capable of cutting safely all cables with a diameter up to themaximum diameter specified by the manufacturer.4.2.5The blade(s) of the cutting head shall be made of a durable metallic material with a surfacehardness ranging between 558 HV5 and 715 HV5 (50 up to 60 HRC) (see ISO 6507-1).4.2.6The cutting head shall be designed to ensure that cutting is done continuously until thecable is cut through completely.4.2.7If the hydraulic pressure disappears for any reason the blade(s) shall return to the startingposition.4.2.8The cutting head shall be connected to the insulating hose by a coupler which requires theuse of a tool to separate it.SIST EN 50340:2002
- 9 - EN 50340:20014.2.9The cutting head(s) shall be compatible with the pump as specified by the manufacturer ofthe pump.4.3Insulating hose4.3.1These hoses shall provide the required electric insulation between the operator and thecable even when the cutting head blade(s) reach(es) the highest nominal voltage at powerfrequency and also under condition of pollution of the outer surface.4.3.2The complete length of the insulating hose shall be made of insulating material. It shall beflexible.4.3.3The insulating hose shall be a single piece and be not less than 5 m long. Moreover, theeffective length shall be in accordance with the recommendations for use as mentioned inannex A.The elongation of the hose when measured at the maximum operating pressure shall be less than5% of the original length.4.3.4The insulating hose and couplings shall withstand the following pressure tests :- an overpressure test of 2 times the maximum operating pressure,- a burst-pressure test of 4 times the maximum operating pressure,- 60 000 pulses at the maximum pulse pressure of 1,33 times the maximum operating pressureand with hydraulic fluid temperature of 100°C.4.4Insulating hydraulic fluidThe insulating hydraulic fluid shall withstand a test voltage of at least 10 kV.4.5Pump4.5.1The pump shall be fitted with a safety valve, a reverse flow valve and a pressure gauge toindicate the operating pressure.4.5.2To ensure that the pump does not move during pumping, the part of the pump in contactwith the ground shall be designed to provide sufficient slip resistance during operation.4.5.3The pump shall be suitable for operation by foot, by hand or by power driven operation.4.5.4Any means provided to adjust the maximum operating pressure shall only be accessiblevia a cover/plate, or enclosure which needs a special tool for removal.4.5.5The pressure level at which the safety valve shall function shall be reached with no morethan 50 strokes of the pump operating mechanism and no more than one minute in the case ofpower driven pumps.SIST EN 50340:2002
EN 50340:2001- 10 -4.6Safety valve4.6.1The safety valve shall release pressure in excess of the operating pressure by divertingthe flow of the insulating fluid back into the storage compartment.4.6.2The safety valve shall close automatically when the pressure in the system decreasesbelow the maximum operating pressure.4.7Reverse flow valveThe reverse flow valve shall be readily operated from the operating position.4.8Pressure gauge4.8.1The pressure indicated by the pressure gauge shall be clear and unambiguous whenviewed from the operating position.4.8.2 The pressure gauge shall either be protected against mechanical damage or be sufficientlyrobust in construction.4.8.3The range of pressure shown by the pressure gauge shall extend from « No pressure » toa value not less than 1,2 times the maximum operating pressure. The «maximum operatingpressure» shall be clearly indicated by a marking in red. The indication shall be clear andunambiguous when viewed from the operating position.4.9Hydraulic coupler4.9.1The mating parts of the coupler shall be capable of being easily connected by hand on thepump and by a tool on the head.4.9.2The mating parts of the coupler, once properly connected, shall neither separate underpressure nor leak.4.9.3To protect against the ingress of foreign bodies and pollutants, each part of any couplershall be provided with a readily removable cover or cap.NOTE
These covers and caps should be made captive to their individual parts of the couplers, so they are not lost.4.10Equipotential bonding and earthing systemThe cable cutting device shall be usable according to the two following methods (4-10-1 and4-10-2). So the cable cutting device shall be equipped with identified fittings where the earthinglinks will be connected (see ANNEX A).4.10.1Bonding shall be made between the pump and the earth (ground) by means of an earthingcable having a minimum cross section area of not less than 16 mm2 and a length no greater than1 m.4.10.2The cutting head shall be earthed. The earthing cable shall meet the requirements ofEN 61230.SIST EN 50340:2002
- 11 - EN 50340:20014.11Marking4.11.1Marking shall be legible and durable.4.11.2The following marking shall appear on the cable cutting device.4.11.2.1Cutting head-mark of origin (name or trademark of the manufacturer),-year of manufacture,-type,-number of production or serial number,-maximum operating pressure,-maximum cable diameter,-double triangle symbol (see Figure 2 ).4.11.2.2Insulating hose The marking specified shall appear along the length of the hose and the interval between the endof a mark and the beginning of the next identical mark shall not be greater than 500 mm.- mark of origin (name or trademark of the manufacturer),-year of manufacture- type,-nominal diameter,-year of manufacture.4.11.2.3Hydraulic couplerThe marking specified may be placed on the coupler parts or adjacent to the coupler parts. Ifmarking is placed on the hydraulic hose it shall be clearly distinguished from the marking of4.11.2.2.- mark of origin (name or trademark of manufacturer),- year and month of manufacture,- maximum operating pressure.- double triangle symbol (see Figure 2),4.11.2.4Pump- mark of origin (name or trademark of the manufacturer),- year of manufacture,- type,- number of production or serial number,- maximum operating pressure,- indication of the types of cutting head(s) to be used with the pump,- double triangle symbol (see Figure 2).SIST EN 50340:2002
EN 50340:2001- 12 -4.12Instructions for useEach cable cutting device shall be accompanied by « Instructions for use ». These instructionsshall contain all the necessary information concerning the assembly, the use and maintenance ofthe device so that it is safe in use (see ANNEX A).5Tests5.1GeneralThe tests to be carried out are listed in annex B. The sequence of tests shall follow the sequencesas set out in the text.A single complete cable cutting device of a particular design shall be subjected to all the tests inthe sequence shown.The type tests shall be carried out on three devices. Should one device fail during the type test,the complete test programme shall be repeated on three further test devices.If one or more devices fail again in the second series of type tests, the test shall be considered asfailed.Unless otherwise indicated the tests shall be carried out under standard atmospheric conditionsaccording to HD 437, ie an ambient temperature of +15°C to +35°C and a relative humidity of45 % to 75 %.The tolerance limits for the applied test values shall be 5 %.5.2 Inspection, instructions for use and marking5.2.1InspectionThe requirements of
4.1, 4.2, 4.3, 4.5, 4.7, 4.8, 4.9 and 4.10 shall be verified by visual orfunctional inspection and measurements.NOTE
Visual inspection means visual inspection by a person with normal or corrected vision without additionalmagnification.5.2.2 Instructions for useThe requirements of sub clause 4.12 shall be verified by examination of the instructions for use.5.2.3MarkingThe durability of the marking is verified by rubbing the marking for 15 s with a piece of lint-freecloth soaked into water and then rubbing it for further 15 s with a lint-free cloth soaked into ethylalcohol.The test is considered as passed if the marking is clearly legible and shows no curling or becomesdetached after this rubbing.Marking made by engraving or moulding need not be subjected to this test.SIST EN 50340:2002
- 13 - EN 50340:20015.3Test under pressure of the insulating hose and couplersThe insulating hose and couplers shall be tested according to the procedure of ISO 1402 foroverpressure and burst-pressure tests and ISO 6803 for impulse-pressure tests.The tests are considered as passed if the requirements of 4.3.4 are fulfilled without failure orleaks.5.4Dielectric strength of the hydraulic fluidThe dielectric strength of the hydraulic fluid shall be measured according to EN 60156.The test is considered as passed if the breakdown voltage is not less than 10 kV.5.5Hardness of the blade(s)The test shall be carried out according to ISO 6507-1 on the cutting blade(s).The test is considered as passed if the requirement of 4.2.5 is fulfilled.5.6Leakage current of the insulating hoseThe test shall be carried out on test pieces of the insulating hose with a length of (700 ± 50) mm.Each test piece shall be filled with insulating liquid free of air and each end shall be terminatedwith the appropriate coupling parts.The outer sheath of each test piece shall be removed to expose the outer layer of reinforcingbraid (fabric). The length of sheath to be removed shall be 20 mm in length situated centrally foreach test sample. The sheath shall be removed for the entire circumference of the hose.Each test piece shall be immersed completely in water having a resistivity of (100 ± 15) .m and atemperature of (20 ± 5)°C for a period of not less than 96 hours.After that period any water adhering to the test piece shall be wiped off with a lint-free, absorbentcellulose paper.Within one minute after the removal from the water, each test piece shall be placed in a testarrangement according to Figure 3. The two electrodes shall be insulated at a minimum height ofnot less than 800 mm above the floor.Electrode 1 shall be connected to the high voltage source.Electrode 2 shall be connected to the measuring lead.The connecting lead from the high voltage source shall be arranged to be approximately in thesame axis as that of the insulating hose, complete with coupling parts. The current through thetest arrangement without a test piece in place shall not exceed 10 µA when the test voltage isapplied.A test voltage of 36 kV (rms) (50 Hz or 60 Hz) shall be applied according to HD 588.1 S1 andEN 60060-2 for a period not less than five minutes. The current shall be measured during the lastfour minutes of the test.The test is considered as passed if the current does not exceed 50 µA during the last four minutesof the test.5.7Test under stressThe test shall be carried out with the cable cutting device fully assembled and ready for operationwith a test probe defined as follows.SIST EN 50340:2002
EN 50340:2001- 14 -The test probe shall be a rod made from brass Ms58 (see EN 12164) with a diameter of 60 mmand having minimum length of 200 mm.The test probe shall be placed in the cutting head so that it projects evenly either side of the lineof cut of the blade(s) for a distance of at least 50 mm.NOTE
The distance should be 100 mm.The pump shall be operated until the safety valve operates.
This pressure shall be maintained forat least two minutes.The test is considered as passed in no visible damage occurs impairing either the security of theoperator or the functioning of the device.5.8Self-acting opening testThe test shall be carried out with a cable cutting device fully assembled and ready for operation.The cutting head shall be prepared as follows :- the blade(s) shall be equipped with means capable to apply forces against the openingdirection,- the fixed part of the cutting head shall be positioned so that the blade(s) moves verticallydownwards,- the forces against the opening direction according to Table 1 shall be applied to the blade(s)(see Figure 4) so that they oppose the cutting action and are in the axis of the cutting action.Table 1 - Forces to be applied to the blade(s) to oppose the opening actionMethod of cuttingForce F [N]Shearing blades100Guillotine-type blades200Three steel wires arranged in a bundle but not twisted specified according to ISO 8457-1 andISO 8457-2, with a length of 450 mm to 500 mm shall be placed in the cutting head. The bundleshall be at a right angles to or perpendicular to the axis of the cutting blade and project equallyeither side of the line of cut of the blade(s) for a distance of not less than 200 mm.The wires shall be securely fixed at one end and shall be positioned at the weakest point of theblade(s) which is expected to jam.The cutting shall be carried out according to the instructions for use.The test shall be repeated two more times. The wires may be placed at other points of theblade(s) which are considered to be weak.The test is considered as passed if each of the three cutting actions can be completed accordingto the instructions for use.5.9Accuracy of cuttingThe test shall be carried out with a cable cutting device ready for operation and with a test probedefined below.SIST EN 50340:2002
- 15 - EN 50340:2001The test probe shall be made from high-density polyethylene with a density of 0,94 g/cm3, a tearresistance of (450 ± 50) % and a diameter of (50 ± 2,5) mm. The length of the test probe shall beat least 500 mm.The cutting head shall be placed on a flat surface. The test probe shall be placed in the cuttinghead so that a length of (200 ± 2) mm projects beyond the line of cut of the cutting blade(s). Theother end of the test probe shall be securely clamped.The cutting head shall rest in that po
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.