SIST EN 13763-26:2004
(Main)Explosives for civil uses - Detonators and relays - Part 26: Definitions, methods, and requirements for devices and accessories for reliable and safe function of detonators and relays
Explosives for civil uses - Detonators and relays - Part 26: Definitions, methods, and requirements for devices and accessories for reliable and safe function of detonators and relays
1.1 This document specifies the constructional and functional requirements and methods for testing of devices and accessories needed for the reliable and safe initiation of detonators and shock tubes, under normal working conditions. It covers the following six types of equipment:
3 blasting machines for initiating electric detonators;
3 blasting machine checkers;
3 initiating circuit field testers;
3 shot firing cables for use with electric blasting machines;
3 detonator connecting wires;
3 shock tube initiators for non-electric systems.
1.2 Equipment indented only for use indoors is excluded from the environmental testing in Annex B.
1.3 Blasting machines for use with electronic detonators and magnetically coupled detonators are outside the scope of this document.
NOTE This document does not meet all of the requirements of all relevant European Directives, such as the ATEX Directive 94/9/EC and the low voltage Directive 73/23/EEC. For example, EN 61010 (Safety requirements for electrical equipment for measurement, control and laboratory use) might also be relevant for some devices and accessories described in this document.
Explosivstoffe für zivile Zwecke - Zünder und Verzögerungselemente - Teil 26: Definitionen, Verfahren und Anforderungen für Geräte und Zubehör für die zuverlässige und sichere Funktion von Zündern und Verzögerern
1.1 Dieses Dokument legt die konstruktiven und funktionstechnischen Anforderungen und Verfahren für die Prüfung von Geräten und Zubehör fest, die für eine zuverlässige und sichere Zündung von Zündern und Verzögerern unter üblichen Arbeitsbedingungen benötigt werden. Die Norm behandelt folgende sechs Arten von Ausrüstungsgegenständen:
- Zündmaschinen zum Zünden von elektrischen Zündern;
- Zündmaschinen Prüfgeräte;
- Zündkreisprüfgeräte für die Vorort Prüfung;
- Zündkabel für die Verwendung in Verbindung mit elektrischen Zündmaschinen;
- Verbindungsdrähte für Zünder;
- Zündschlauchzünder für nichtelektrische Systeme.
1.2 Geräte für die ausschließliche Verwendung in Gebäuden sind von der Umgebungsprüfung nach Anhang B ausgeschlossen.
1.3 Zündmaschinen für die Verwendung mit elektronischen Zündern und magnetisch gekoppelten Zündern gehören nicht zum Anwendungsbereich dieses Dokuments.
ANMERKUNG Dieses Dokument erfüllt nicht alle Anforderungen aller relevanten Europäischen Richtlinien, wie der ATEX Richtlinie 94/9/EG und der Niederspannungsrichtlinie 73/23/EWG. Zum Beispiel könnte EN 61010 (Sicherheitsanforderungen für elektrische Geräte für Messungen, Überwachungen und Laborzwecke) auch für einige Geräte und einiges Zubehör in diesem Dokument relevant sein.
Explosifs a usage civil - Détonateurs et relais - Partie 26: Définitions, méthodes et exigences relatives aux dispositifs et accessoires pour la fiabilité et la sécurité de fonctionnement des détonateurs et relais
Eksplozivi za civilno uporabo – Detonatorji in zakasnilniki – 26. del: Definicije, metode in zahteve za naprave in sredstva za zanesljivo in varno delovanje detonatorjev in zakasnilnikov
General Information
Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Eksplozivi za civilno uporabo – Detonatorji in zakasnilniki – 26. del: Definicije, metode in zahteve za naprave in sredstva za zanesljivo in varno delovanje detonatorjev in zakasnilnikovExplosivstoffe für zivile Zwecke - Zünder und Verzögerungselemente - Teil 26: Definitionen, Verfahren und Anforderungen für Geräte und Zubehör für die zuverlässige und sichere Funktion von Zündern und VerzögerernExplosifs a usage civil - Détonateurs et relais - Partie 26: Définitions, méthodes et exigences relatives aux dispositifs et accessoires pour la fiabilité et la sécurité de fonctionnement des détonateurs et relaisExplosives for civil uses - Detonators and relays - Part 26: Definitions, methods, and requirements for devices and accessories for reliable and safe function of detonators and relays71.100.30Eksplozivi. PirotehnikaExplosives. PyrotechnicsICS:Ta slovenski standard je istoveten z:EN 13763-26:2004SIST EN 13763-26:2004en01-november-2004SIST EN 13763-26:2004SLOVENSKI
STANDARD
SIST EN 13763-26:2004
EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 13763-26August 2004ICS 71.100.30English versionExplosives for civil uses - Detonators and relays - Part 26:Definitions, methods, and requirements for devices andaccessories for reliable and safe function of detonators andrelaysExplosifs à usage civil - Détonateurs et relais - Partie 26:Définitions, méthodes et exigences relatives aux dispositifset accessoires pour la fiabilité et la sécurité defonctionnement des détonateurs et relaisExplosivstoffe für zivile Zwecke - Zünder undVerzögerungselemente - Teil 26: Definitionen, Verfahrenund Anforderungen für Geräte und Zubehör für diezuverlässige und sichere Funktion von Zündern undVerzögerernThis European Standard was approved by CEN on 21 June 2004.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the Central Secretariat or to any CEN member.This European Standard exists in three official versions (English, French, German). A version in any other language made by translationunder the responsibility of a CEN member into its own language and notified to the Central Secretariat has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France,Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia,Slovenia, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36
B-1050 Brussels© 2004 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 13763-26:2004: ESIST EN 13763-26:2004
EN 13763-26:2004 (E) 2 Contents page Foreword.4 1 Scope.6 2 Normative references.6 3 Terms and definitions.7 4 General requirements for Testing.9 5 Blasting machines for initiating electric detonators.9 5.1 Requirements for blasting machines to be verified by visual examination of the machine, simple measurement and reference to the manufacturer’s parts list and scale drawings.9 5.2 Test for insulation resistance between exposed conducting parts.10 5.3 Electrical voltage withstand of insulated parts.11 5.4 Test to determine the output energy of the blasting machine.11 5.5 Test to determine the output voltage of a blasting machine.15 5.6. Test to check the “battery low” indication on battery operated machines.15 5.7. “Ready to fire” interlock and indicator on clockwork or capacitor blasting machines designed to produce a non-adjustable pre-determined output firing voltage.16 5.8 Test to ensure the accuracy of capacitor blasting machine’s indicators.17 5.9 Test to check that a sequential blasting machine will not fire if any of the initiating circuits connected to its output terminals are open circuit or contain too much resistance to ensure
reliable initiation.18 5.10 Test to check that capacitor discharge machines include a safety discharge mechanism.19 5.11 Test to check that, when fired, the output of a clockwork driven blasting machine is not released until the generated voltage is at least 90% of the maximum intended value.20 5.12 Ignition protection of blasting machines intended for use in potentially explosive atmospheres.21 5.13 Test to check the output energy cut-off device in machines intended for use in potentially explosive atmospheres of gas.21 5.14 Electromagnetic compatibility and interference tests.22 5.15 Ingress protection tests.23 5.16 Climatic and
mechanical tests.23 5.17 Marking requirements for blasting machines.23 6 Blasting machine checkers.24 6.1 General.24 6.2 Requirements for blasting machines checkers to be verified by visual examination of the checker, simple measurement and reference to the manufacturer’s parts list and scale drawings.25 6.3 Test for insulation resistance between exposed parts.25 6.4 Electrical voltage withstand of insulated parts.26 6.5 Test to establish the checker’s ability to indicate that a blasting machine will function correctly, also to indicate abnormal deterioration in a blasting machine’s output.26 6.6 Blasting machine checkers used to check the output energy cut off time of blasting machine’s intended for use in potentially explosive atmospheres.28 6.7 Electromagnetic compatibility and interference test.29 6.8 Ingress protection.29 6.9 Climatic and mechanical tests.29 6.10 Marking requirements for blasting machine checkers.30 7 Field circuit testers.31 SIST EN 13763-26:2004
EN 13763-26:2004 (E) 3 7.1 Requirements for field circuit testers to be verified by visual examination of the tester, simple measurement and reference to the manufacturer’s scale drawings.31 7.2 Test for insulation resistance between exposed conducting parts.31 7.3 Test for electrical voltage withstand of insulated parts.32 7.4 Tests for short circuit current limitation and maximum output energy.33 7.5 Test of the accuracy of field circuit testers.36 7.6 Intrinsic safety of field circuit testers intended for use in potentially explosive atmospheres.37 7.7 Electromagnetic compatibility and interference.37 7.8 Ingress protection.38 7.9 Climatic and mechanical tests.38 7.10 Marking requirements for field circuit testers.38 8 Shot-firing cables for use with electric blasting machines.39 8.1 Types of shot firing cable.39 8.2 Electrical resistance.41 8.3 Tensile tests.42 8.4 Shot-firing cables flexural strength tests.43 8.5 Shot-firing cable abrasion test.43 8.6 Shot-firing cable insulation test.44 8.7 Shot-firing cable thermostability tests.45 8.8 Shot-firing cables electrical insulation resistance and insulation breakdown.45 8.9 Marking requirements for shot-firing cables.46 9 Connecting wires for use with electric blasting machines.46 9.1 Types of connecting wires.46 9.2 Requirements and tests.47 9.3 Marking requirements for connecting wires.48 10 Shock tube initiators.49 10.1 Requirements for shock tube initiators to be verified by visual examination of the initiator, simple measurement and reference to the manufacturer’s scale drawings.49 10.2 Function test for shock tube initiators.49 10.3 Electromagnetic compatibility and interference.50 10.4 Ingress protection.50 10.5 Climatic and mechanical tests.50 10.6 Marking requirements for shock tube initiators.50 Annex A (normative)
Electromagnetic compatibility and interference testing.52 As described in the relevant European Standard.52 Annex B (normative)
Climatic and mechanical tests.55 Bibliography.59
SIST EN 13763-26:2004
EN 13763-26:2004 (E) 4 Foreword This document (EN 13763-26:2004) has been prepared by Technical Committee CEN/TC 321 "Explosives for civil uses", the Secretariat of which is held by AENOR. This European Standard shall be given the status of a national standard, either by publication of an identical text or by endorsement, at the latest by February 2005, and conflicting national standards shall be withdrawn at the latest by February 2005. This document is one of a series of standards with the generic title Explosives for civil uses – Detonators and relays. The other parts of this series are listed below: EN 13763-1
Part 1: Requirements EN 13763-2
Part 2: Determination of thermal stability EN 13763-3
Part 3: Determination of sensitiveness to impact EN 13763-4
Part 4: Determination of resistance to abrasion of leading wires and shock tubes EN 13763-5
Part 5: Determination of resistance to cutting damage of leading wires and shock tubes EN 13763-6
Part 6: Determination of resistance to cracking in low temperatures of leading wires EN 13763-7 Part 7: Determination of the mechanical strength of leading wires, shock tubes, connections, crimps and closures EN 13763-8
Part 8: Determination of resistance to vibration of plain detonators EN 13763-11
Part 11: Determination of resistance to damage by dropping of detonators and relays EN 13763-12
Part 12: Determination of resistance to hydrostatic pressure EN 13763-13
Part 13: Determination of resistance of electric detonators against electrostatic discharge prEN 13763-15 Part 15: Determination of equivalent initiating capability EN 13763-16
Part 16: Determination of delay accuracy EN 13763-17
Part 17: Determination of no-fire current of electric detonators EN 13763-18
Part 18: Determination of series firing current of electric detonators EN 13763-19
Part 19: Determination of firing impulse of electric detonators EN 13763-20
Part 20: Determination of total electrical resistance of electric detonators EN 13763-21
Part 21: Determination of flash-over voltage of electric detonators EN 13763-22 Part 22: Determination of capacitance, insulation resistance and insulation breakdown of leading wires EN 13763-23 Part 23: Determination of the shock-wave velocity of shock tube SIST EN 13763-26:2004
EN 13763-26:2004 (E) 5 EN 13763-24
Part 24: Determination of the electrical non-conductivity of shock tube EN 13763-25 Part 25: Determination of transfer capability of surface connectors, relays and coupling accessories CEN/TS 13763-27 Part 27: Definitions, methods and requirements for electronic initiation systems According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
SIST EN 13763-26:2004
EN 13763-26:2004 (E) 6
1 Scope 1.1 This document specifies the constructional and functional requirements and methods for testing of devices and accessories needed for the reliable and safe initiation of detonators and relays, under normal working conditions. It covers the following six types of equipment: blasting machines for initiating electric detonators; blasting machine checkers; initiating circuit field testers; shot firing cables for use with electric blasting machines; detonator connecting wires; shock tube initiators for non-electric systems. 1.2 Equipment indented only for use indoors is excluded from the environmental testing in Annex B. 1.3 Blasting machines for use with electronic detonators and magnetically coupled detonators are outside the scope of this document. NOTE This document does not meet all of the requirements of all relevant European Directives, such as the ATEX Directive 94/9/EC and the low voltage Directive 73/23/EEC. For example, EN 61010 (Safety requirements for electrical equipment for measurement, control and laboratory use) might also be relevant for some devices and accessories described in this document. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 13857-1:2003, Explosives for civil uses – Part 1: Terminology. EN 13763-4:2003, Explosives for civil uses – Detonators and relays – Part 4: Determination of resistance to abrasion of leading wires and shock tubes. EN 13763-5, Explosives for civil uses – Detonators and relays – Part 5: Determination of resistance to cutting damage of leading wires and shock tubes. EN 13763-6, Explosives for civil uses – Detonators and relays – Part 6: Determination of resistance to cracking in low temperatures of leading wires. EN 13763-22:2003, Explosives for civil uses – Detonators and relays – Part 22: Determination of capacitance, insulation resistance and insulation breakdown of leading wires. EN 55011:1998, Industrial, scientific and medical (ISM) radio-frequency equipment – Radio disturbance characteristics – Limits and methods of measurement (CISPR 11:1997, modified). EN 60068-2-1:1993, Environmental testing – Part 2: Tests – Tests A: Cold (IEC 60068-2-1:1990). SIST EN 13763-26:2004
EN 13763-26:2004 (E) 7 EN 60068-2-2:1993, Basic environmental testing procedures – Part 2: Tests – Tests B: Dry heat (IEC 600-2-2:1976). EN 60068-2-14:1999, Environmental testing – Part 2: Tests – Test N: Change of temperature (IEC 60068-2-14:1984 + A1:1986). EN 60068-2-29:1993, Basic environmental testing procedures – Part 2: Tests – Test Eb and guidance: Bump (IEC 60068-2-29:1987). EN 60068-2-30:2004, Environmental testing – Part 2: Tests – Test Db and guidance: Damp heat, cyclic (12 + 12 hour cycle) (IEC 60068-2-30:1980 + A1: 1985). EN 60068-2-32, Basic environmental testing procedures – Part 2: Tests – Test Ed: Free fall (IEC 60068-2-32:1975 + A1: 1982 + A2: 1990). EN 60068-2-64:1994, Environmental testing – Part 2: Test methods – Test Fh: Vibration, broad band random (digital control) and guidance (IEC 60068-2-64:1993 + Corrigendum:1993). EN 60068-2-78:2001, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat, steady state (IEC 60068-2-78:2001). EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989). EN 61000-4-2, Electromagnetic compatibility (EMC) – Part 4: Testing and measurement techniques – Section 2: Electrostatic discharge immunity test – Basic EMC publication (IEC 61000-4-2:1995). EN 61000-4-3, Electromagnetic compatibility (EMC) – Part 4-3: Testing and measurement techniques;Radiated, radio-frequency, electromagnetic field immunity test (IEC 61000-4-3:2002). EN 61000-4-4, Electromagnetic compatibility (EMC) – Part 4: Testing and measurement techniques – Section 4: Electrical fast transient/burst immunity test – Basic EMV publication (IEC 61000-4-4:1995). EN 61000-4-5, Electromagnetic compatibility (EMC) – Part 4: Testing and measurement techniques – Section 5: Surge immunity test (IEC 61000-4-5:1995) EN 61000-4-6, Electromagnetic compatibility (EMC) – Part 4: Testing and measurement techniques – Section 6: Immunity to conducted disturbances, induced by radio-frequency fields (IEC 61000-4-6:1996). EN 61000-4-11, Electromagnetic compatibility (EMC) – Part 4: Testing and measurement techniques – Section 11: Voltage dips, short interruptions and voltage variations immunity test (IEC 61000-4-11:1994). EN ISO/IEC 17025, General requirements for the competence of testing and calibration laboratories (ISO/IEC 17025:1999). 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 13857-1:2003 and the following apply. 3.1
blasting machine equipment intended to supply electrical energy to a circuit of electric detonators to initiate them 3.2
sequential blasting machine blasting machine incorporating a means to control the sequence of firing of the electric detonators connected to it SIST EN 13763-26:2004
EN 13763-26:2004 (E) 8 3.3
blasting machine checker equipment specifically designed for connection to a blasting machine’s output terminals to verify that the machine’s output performance is within the operating limits specified by its manufacturer and that it is capable of initiating the maximum number of detonators claimed NOTE
Blasting machine checkers are usually supplied by the blasting machine manufacturer and are designed for use with a particular type of machine. They are designed to allow the blasting machine user to perform periodic checks to verify that the machine is functioning correctly before it is used on site. The indication provided by checkers may vary from one type to another. For example, some have a simple “Go/No-Go” indicator lamp and others have analogue or digital displays capable of indicating the blasting machine’s actual output energy. In some E.U. member state countries, the regular use of such checkers is required by national legislation as part of a users “blasting machine maintenance scheme”. 3.4
initiating circuit electrical circuit intended to be connected to a blasting machine, consisting of shot firing cable, electric detonators, detonator leading wires and any extensions to them by connecting wires 3.5
field circuit tester instrument intended for measuring, checking, or testing an initiating circuit outdoors on site, usually before an attempt is made to initiate the detonators with a blasting machine 3.6
continuity and resistance tester type of field circuit tester, intended for measuring, checking or testing the continuity and resistance of an initiating circuit 3.7
continuity and impedance tester type of field circuit tester, intended for measuring, checking or testing the continuity and impedance of an alternating current initiating circuit at a frequency specified by the manufacturer 3.8
circuit insulation tester type of field circuit tester, intended to measure, check or test the electrical resistance of the insulation between the main electrical conductors in an initiating circuit and the general mass of earth 3.9
connecting wires electrically insulated conductors that can be connected between the shot-firing cable and the detonator leading wire NOTE Connecting wires are normally used only once in service because they are located so close to the explosive devices that they are usually damaged by the explosive blast. 3.10
maximum initiating circuit resistance
(Re) maximum electrical resistance of a particular configuration of an electrical detonator initiating circuit. NOTE The maximum initiating circuit resistance is given by the equation.
R e = R t + NR s n 2 SIST EN 13763-26:2004
EN 13763-26:2004 (E) 9
where Rt is the shot firing cable electrical resistance in ; N is the total number of electric detonators; Rs
is the total resistance in
of one electric detonator; n
is the number of parallel circuits 3.11
shock tube initiator equipment intended to supply a spark or a similar energy impulse to the explosive coating material inside a non electric shock tube so as to initiate it 4 General requirements for Testing 4.1
Unless otherwise specified in the test instructions, testing shall be performed within an ambient temperature range of (20 ± 5) °C, a relative humidity of (60 ± 15) % and an air pressure of (960 ± 100) hPa. If these conditions cannot be achieved or maintained, the actual conditions shall be recorded in the test report. 4.2
The order of checking and testing of each device or accessory shall be in the same order as they appear in this document. NOTE If there are no influences to the test results, tests may also be carried out in parallel using more than one test piece. 4.3
Equipment and devices intended for use outdoors shall be subjected to the environmental tests in Annex B. 5 Blasting machines for initiating electric detonators 5.1 Requirements for blasting machines to be verified by visual examination of the machine, simple measurement and reference to the manufacturer’s parts list and scale drawings 5.1.1 Every blasting machine shall have output terminals or outlets incorporating means to securely attach the type of shot firing cable intended to be used with them. The area of electrical contact of each terminal shall be a least twice the cross sectional area of the shot firing cable intended to be used with it. The blasting machine’s output terminals shall have a barrier of insulating material between them which protrudes at least
4 mm higher than the conductive part. 5.1.2 Every blasting machine shall contain a means for the operator to control the instant of firing, or control the commencement of the firing sequence. SIST EN 13763-26:2004
EN 13763-26:2004 (E) 10 5.1.3 Every blasting machine not designed to be carried in the hand at all times by the operator, shall incorporate a device, e.g. a key operated key-switch or removable operating handle, which prevents the machine being operated when it is removed from the machine. 5.1.4 Capacitor blasting machines with a selectable initiating circuit output voltage shall include a suitable indicator to show that the required voltage has been achieved (for example a meter or a LED indicator). 5.1.5 Blasting machines shall not produce their output energy by direct manual operation of a speed dependent generating mechanism. 5.1.6 Blasting machines intended for use in coal mines shall contain a two-pole switch (which may be electrical, mechanical or electronic) initiated by the firing mechanism for connecting the internal energy source (e.g. generator, capacitor, battery) to the output terminals. 5.1.7 Blasting machines intended for use in potentially explosive atmospheres of gas (e.g. in coal mines, or tunnels in coal/oil bearing strata), shall not have any part of their exposed surface made of alloys containing more than 15 %, by mass in total, of aluminium, magnesium or titanium and not more than 6 %, by mass in part, of magnesium and titanium. NOTE This requirement is to prevent incendive sparking by thermite reaction when such light metals impact with rusty iron/steel. 5.2 Test for insulation resistance between exposed conducting parts 5.2.1 Requirements The insulation resistance between exposed electrically conducting parts (including the output terminals) and the blasting machine outer enclosure, or outer case, or container, shall be at least 2 MΩ when tested at
500 V DC. 5.2.2 Test pieces One complete blasting machine of each type. 5.2.3 Apparatus Electrical insulation test meter, capable of applying 500 V with a tolerance of ± 10 V and measuring the insulation resistance over a range between 0 MΩ to 3 MΩ, within a tolerance of ± 0,1 MΩ. 5.2.4 Procedure Short circuit the terminals of the blasting machine and apply the test voltage of 500 V between the terminals and the casing of the equipment. Measure and record the insulation resistance in MΩ. 5.2.5 Test report The test report shall conform to EN ISO/IEC 17025. In addition, the following information shall be given: a) the insulation resistance in MΩ; b) whether or not the insulation is ≥ 2 MΩ. SIST EN 13763-26:2004
EN 13763-26:2004 (E) 11 5.3 Electrical voltage resistance of insulated parts 5.3.1 Requirements The insulated parts of the blasting machine shall be capable of withstanding twice the peak output voltage of the machine, or 1 000 V AC RMS whichever is the greater for a period of 60 s without flashover or breakdown of the insulation. Where fitted, any mechanically operated switch, provided to disconnect the output circuit after a pre-determined interval shall be bridged to allow the machine’s internal components to be subjected to the insulation test. 5.3.2 Test pieces One complete blasting machine of each type. 5.3.3 Apparatus 5.3.3.1 A variable high voltage AC 50 Hz source capable of applying
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