Live working - Footwear for electrical protection - Insulating footwear and overboots

This European Standard specifies the requirements and testing for PPE footwear used as electrical insulating footwear and overboots that provide protection of the worker against electric shock and used for working live or close to live parts on installations up to 36 000 V AC or 25 000 V DC. The products designed and manufactured according to this standard contribute to the safety of the users provided they are used by skilled persons, in accordance with safe methods of work and the instructions for use. Antistatic, electrical shock resistant and conductive footwear are not covered by this standard. NOTE Part 2 Electrical Shock Resistant Footwear and Part 3 Conductive Footwear for Live Working are in development.

Arbeiten unter Spannung - Schuhe für elektrischen Schutz - Isolierende Schuhe und Überschuhe

Diese Europäische Norm legt die Anforderungen und Prüfungen für Schuhe als Persönliche Schutz¬ausrüstung (PPE) fest, die als elektrisch isolierende Schuhe und Überschuhe, Schutz gegen elektrischen Schlag beim Arbeiten unter Spannung oder in der Nähe von unter Spannung stehenden Teilen in Anlagen bis 36 000 V Wechselspannung bieten. Die nach dieser Norm entwickelten und hergestellten Produkte tragen zur Sicherheit der Anwender bei, vorausgesetzt, sie werden von Elektrofachkräften in Übereinstimmung mit sicheren Arbeitsverfahren und der Gebrauchsanleitung verwendet. Antistatische, gegen elektrischen Schlag beständige und leitfähige Schuhe sind vom Anwendungsbereich ausgeschlossen. ANMERKUNG 1 Diese Norm enthält nur Vorschriften für Wechselspannungsprüfungen. Es liegen begrenzte Erfahrungen für den Einsatz in Gleichstrom-Anwendungen vor. ANMERKUNG 2 Siehe Anhang A für empfohlene Gleichstromprüfungen und höchsten Gebrauch.

Travaux sous tension - Chaussures pour protection électrique - Partie 1 : Chaussures et couvre-chaussures isolants

La présente Norme européenne spécifie les exigences et les essais pour les chaussures de type EPI utilisées comme chaussures et couvre-chaussures électriquement isolants qui assurent la protection des travailleurs contre les chocs électriques et utilisées dans les travaux sous tension ou à proximité de parties actives dans des installations jusqu'à 36 000 V en courant alternatif et 25 000 V en courant continu. Les produits conçus et fabriqués conformément à la présente norme contribuent à la sécurité des utilisateurs, sous réserve qu'ils soient utilisés par des personnes qualifiées, conformément aux méthodes sures de travail et aux instructions d'utilisation. Les chaussures antistatiques, résistantes aux chocs électriques et conductrices ne sont pas couvertes par la présente Norme. NOTE La Partie 2 Chaussures résistantes aux chocs électriques et la Partie 3 Chaussures conductrices pour les travaux sous tension sont en cours d'élaboration.

Delo pod napetostjo - Obutev za zaščito pred električnim udarom - Elektroizolacijska obutev in zaščitne gamaše

Ta evropski standard določa zahteve in preskušanje za zaščitno obutev (PPE), ki se uporablja kot elektroizolacijska obutev, in zaščitne gamaše, ki se uporabljajo za delo z deli pod napetostjo na opremi z izmenično napetostjo do 36.000 V ali v njihovi bližini.
Izdelki, zasnovani in izdelani v skladu s tem standardom, prispevajo k varnosti uporabnikov, kadar jih uporabljajo usposobljene osebe v skladu z varnimi metodami dela in navodili za uporabo.
Antistatična in prevodna obutev ter obutev, odporna na udar, ni zajeta v tem standardu.

General Information

Status
Published
Publication Date
11-Jan-2018
Current Stage
6060 - Document made available
Due Date
12-Jan-2018
Completion Date
12-Jan-2018

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Arbeiten unter Spannung - Schuhe für elektrischen Schutz - Isolierende Schuhe und ÜberschuheTravaux sous tension - Chaussures pour protection électrique - Chaussures et couvre-chaussures isolantesLive working - Footwear for electrical protection - Insulating footwear and overboots13.340.50Varovanje nog in stopalLeg and foot protection13.260Protection against electric shock. Live workingICS:Ta slovenski standard je istoveten z:EN 50321-1:2018SIST EN 50321-1:2018en,fr01-marec-2018SIST EN 50321-1:2018SLOVENSKI

STANDARDSIST EN 50321:20001DGRPHãþD
SIST EN 50321-1:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 50321-1
January 2018 ICS 13.260; 13.340.50
Supersedes
EN 50321:1999English Version

Live working - Footwear for electrical protection - Insulating footwear and overboots

Travaux sous tension - Chaussures pour protection électrique - Chaussures et couvre-chaussures isolants

Arbeiten unter Spannung - Schuhe für elektrischen Schutz -Isolierende Schuhe und Überschuhe This European Standard was approved by CENELEC on 2017-09-14. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration.Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CENELEC member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions. CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic, Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom. European Committee for Electrotechnical Standardization

Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung CEN-CENELEC Management Centre: Rue de la Science 23,

B-1040 Brussels © 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50321-1:2018 ESIST EN 50321-1:2018

EN 50321-1:2018 (E) 2 Contents Page European foreword ............................................................................................................... 4 1 Scope .............................................................................................................................. 5 2 Normative references ..................................................................................................... 5 3 Terms and definitions .................................................................................................... 5 4 Requirements ................................................................................................................. 7 4.1 Electrical classification ................................................................................................. 7 4.2 Non-electrical requirements .......................................................................................... 7 4.2.1 General .................................................................................................................. 7 4.2.2 Footwear and overboot design ............................................................................. 7 4.3 Electrical requirements ................................................................................................ 10 4.4 Marking ......................................................................................................................... 10 4.5 Packaging ..................................................................................................................... 11 4.6 Information to be supplied by manufacturer .............................................................. 11 5 Testing .......................................................................................................................... 12 5.1 General ......................................................................................................................... 12 5.2 Electrical tests ............................................................................................................. 12 5.2.1 General ................................................................................................................ 12 5.2.2 Type tests ............................................................................................................ 13 5.2.3 Tests on footwear with perforation resistant inserts ........................................ 15 5.2.4 Alternative testing in case of footwear or overboots having completed the production phase ......................................................................................................... 16 5.2.5 Test report ........................................................................................................... 17 5.3 Marking ......................................................................................................................... 17 5.4 Packaging ..................................................................................................................... 17 5.5 Instructions for use...................................................................................................... 18 6 Conformity assessment of electrical insulating footwear or electrical insulating overboots having completed the production phase ................................................... 18 7 Modifications ................................................................................................................ 18 Annex A (informative)

Additional information to be supplied by manufacturer

to the instruction for use ....................................................................................................... 19 A.1 Storage, Examination before use, and Precautions in use and after use .................. 19 A.2 Periodic inspection ...................................................................................................... 19 Annex B (normative)

Suitable for live working; double triangle (IEC-60417-5216:2002-10) ................................................................................................................................. 20 Annex C (normative)

Chronological order of type testing ............................................... 21 Annex D (informative)

Classification of defects and tests to be allocated ..................... 22 Annex E (informative)

Rationale for the classification of defects................................... 23 Annex ZZ (informative)

Relationship between this European Standard and the essential requirements of Regulation 425/2016/EEC aimed to be covered ............... 24

SIST EN 50321-1:2018

EN 50321-1:2018 (E) 3 Figures Figure 1 — Designs of electrical insulating footwear ......................................................... 8 Figure 2 — Example of designs of overboot ....................................................................... 8 Figure 3 — Measurement of the height of the upper (X) ..................................................... 9 Figure 4 — Arrangement of electrical tests ...................................................................... 14 Figure 5 — Apparatus for testing footwear with perforation resistant inserts ................ 16 Figure B.1 — Double triangle ............................................................................................. 20 Tables Table 1 — Minimum height (Xmhu) to be tested .................................................................... 9 Table 2 — Proof test voltage, proof test current and withstand test voltage for footwear10 Table 3 — Proof test voltage, proof test current and withstand test voltage for overboots ..................................................................................................................... 10 Table 4 — Clearances to the level of water ....................................................................... 12 Table 5 — Sampling plan ................................................................................................... 17 Table C.1 — Type tests ...................................................................................................... 21 Table D.1 — Classification of defects and associated requirements and tests .............. 22 Table E.1 — Justification for the type of defect ................................................................ 23 Table ZZ.1 — Correspondence between this European Standard and Annex II of the Regulation 425/2016/EEC Personal Protective Equipment ......................................... 24 SIST EN 50321-1:2018

EN 50321-1:2018 (E) 4 European foreword This document (EN 50321-1:2018) has been prepared by CLC/TC 78 “Equipment and tools for live working”. The following dates are fixed: •

latest date by which this document has to be implemented at national level by publication of an identical national standard or by endorsement (dop) 2019-01-12 •

latest date by which the national standards conflicting with this document have to be withdrawn (dow) 2021-01-12 EN 50321-1:2018 includes the following significant technical changes with respect to EN 50321:1999: • the addition of electrical classifications 1, 2, 3 and 4 for AC voltages; • the addition of DC voltage testing for class 00, 0, 1 and 2; • the addition of classification of mechanical class II according to EN ISO 20345, EN ISO 20346, EN ISO 20347; • 16 h moisture conditioning for type test; • water as testing material for type test; • revised marking test; • inclusion of a test report; • inclusion of a dielectric test on footwear with perforation resistant insert; • inclusion of electrical insulating overboot style; • revised marking and test method; • periodic Inspection; • selection of EN 61318 for quality system within an annex; • definition of overboot; • definition of safety, occupational, electrical shock resistant, antistatic and conductive sole footwear; • steel metal balls to be used for routine testing only; • the addition of the Annex ZZ. This document has been prepared under a mandate given to CENELEC by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive. For the relationship with EU Directive see informative Annex ZZ, which is an integral part of this document. SIST EN 50321-1:2018

EN 50321-1:2018 (E) 5 1 Scope This European Standard specifies the requirements and testing for PPE footwear used as electrical insulating footwear and overboots that provide protection of the worker against electric shock and used for working live or close to live parts on installations up to 36 000 V AC or 25 000 V DC. The products designed and manufactured according to this standard contribute to the safety of the users provided they are used by skilled persons, in accordance with safe methods of work and the instructions for use. Antistatic, electrical shock resistant and conductive footwear are not covered by this standard. NOTE Part 2 Electrical Shock Resistant Footwear and Part 3 Conductive Footwear for Live Working are in development. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 12568:2010, Foot and leg protectors - Requirements and test methods for toecaps and penetration resistant inserts EN 60060-1, High-voltage test techniques - Part 1: General definitions and test requirements (IEC 60060-1) EN 60212, Standard conditions for use prior to and during the testing of solid electrical insulating materials (IEC 60212) EN 61318:2008, Live working - Conformity assessment applicable to tools, devices and equipment (IEC 61318:2007) EN ISO 20345:2011, Personal protective equipment - Safety footwear (ISO 20345:2011) EN ISO 20346:2014, Personal protective equipment - Protective footwear (ISO 20346:2014) EN ISO 20347:2012, Personal protective equipment - Occupational footwear (ISO 20347:2012) IEC 60417 DB, Graphical symbols for use on equipment 3 Terms and definitions For the purpose of this document, the terms and definitions given in EN 61318:2008 and the following apply. 3.1 antistatic footwear footwear, the resistance of which is above 1MM kΩ and less than or equal to 1 MMM MΩ Note 1 to entry: Resistance is measured in accordance with ISO 20344:2011, 5.10. [SOURCE: EN ISO 20345:2011, 3.15, modified] 3.2 conductive footwear for live working footwear, the resistance of which is in the range of M kΩ to 1M kΩ Note 1 to entry: Resistance is measured in accordance with EN 60895:2003, 8.3 (this was added in order to be comparable to conductive footwear). [SOURCE: EN 60895:2003, 8.3, modified] SIST EN 50321-1:2018

EN 50321-1:2018 (E) 6 3.3 electrical insulating footwear footwear which protects the wearer against electrical shocks by preventing the passage of dangerous current through the body via the feet [SOURCE: EN ISO 20345:2011, 3.16, modified] 3.4 electrical insulating overboot device designed to be worn over existing footwear, made of flexible insulating material with slip resistant sole, which protects the wearer against electric shock by preventing the passage of dangerous current through the body via the feet [SOURCE: IEC 60050-651:2014, 651-23-05, modified] 3.5 electrical shock resistant footwear footwear of which only the outsole protects the wearer against electrical shocks by preventing the passage of dangerous current through the body via the feet Note 1 to entry: Outsole is defined in Figure 3 as a single unit that incorporates the sole and heel. 3.6 height of the upper vertical distance between the lowest point of the insole i.e. between the heel breast and the back of the heel (see Figure 3) and the lowest point of the upper Note 1 to entry: the height of the upper is referred as (X) in the standard. 3.7 occupational footwear footwear incorporating protective features to protect the wearer from injuries which could arise through accidents Note 1 to entry: Items of occupational footwear are fitted without toecaps designed to give protection against impact or against compression [SOURCE: EN ISO 20347:2012, 3.1 modified] 3.8 proof test voltage specified voltage that is applied to an electrical insulating footwear or overboots for the time defined under specified conditions to assure that the electrical strength of the insulation is above a specified value 3.9 routine test test to which each unit is subjected during or after manufacture to ascertain whether it complies with certain criteria [SOURCE: IEC 60050-151: 2001, 151-16-17, and EN 61318:2008, 3.11, modified] 3.10 safety footwear footwear incorporating features to protect the wearer from injuries that could arise through accidents Note 1 to entry: Items of safety footwear are fitted with toe caps designed to give protection against impact when tested at an energy level of at least 200 J and against compression load of at least 15 kN. [SOURCE: EN ISO 20345:2011, 3.1] SIST EN 50321-1:2018

EN 50321-1:2018 (E) 7 3.11 type test test performed on one or more electrical insulating footwear and overboots representative of the production made to show that the design meets certain requirements [SOURCE: IEC 60050-151:2001 and EN 61318:2008, 3.15, modified] 3.12 withstand test voltage specified voltage that an electrical insulating footwear or overboots withstand without disruptive discharge or other electric failure when voltage is applied under specified conditions 4 Requirements 4.1 Electrical classification Electrical insulating footwear and overboots shall be classified by electrical classes, according to their use on or near electrical installations of a defined nominal voltage, as follows: — Electrical class 00, for installations with nominal voltage up to 500 V AC or 750 V DC; — Electrical class 0, for installations with nominal voltage up to 1 000 V AC or 1 500 V DC; — Electrical class 1, for installations with nominal voltage up to 7 500 V AC or 11 250 V DC; — Electrical class 2, for installations with nominal voltage up to 17 000 V AC or 25 500 V DC; — Electrical class 3, for installations with nominal voltage up to 26 500 V AC; — Electrical class 4, for installations with nominal voltage up to 36 000 V AC; Guidance to the use of electrical insulating footwear and overboots is given in Annex A. 4.2 Non-electrical requirements 4.2.1 General Electrical Insulating footwear shall comply with the requirements of EN ISO 20345:2011, Table 2 Class II or EN ISO 20346:2014, Table 2 or EN ISO 20347:2012, Table 2. Any additional requirements shall comply with EN ISO 20345:2011, Table 18 or EN ISO 20346:2014, Table 18 or EN ISO 20347:2012, Table 16. Electrical insulating overboots shall comply with the requirements of EN ISO 20347:2012, Table 2 The closing system when closed shall remain secure. 4.2.2 Footwear and overboot design 4.2.2.1 General The design of electrical insulating footwear shall be: A low shoe, B ankle boot, C half knee boot or D knee height boot, as given in Figure 1. In addition, the design of electrical insulating overboot shall be those described in Figure 2. Overboots shall at least cover the height of the footwear in use, In addition to the requirements given in EN ISO 20345:2011, Table 2, the height of the upperpart of design A, of electrical class 00 and 0 denoted as X, shall be a minimum of 75 mm, measured as indicated in Figure 3. SIST EN 50321-1:2018

EN 50321-1:2018 (E) 8
Figure 1 — Designs of electrical insulating footwear

Figure 2 — Example of designs of overboot 4.2.2.2 Height of upper The height of the upper (X in mm) is the vertical distance between the lowest point on the insole i.e. between the heel breast and the back of the heel (see Figure 3) and the lowest point of the upper. SIST EN 50321-1:2018

EN 50321-1:2018 (E) 9
Key 1 upper 2 insole
3 outsole

4 lowest point of the insole within the heel region 5 height of the upper (X) Figure 3 — Measurement of the height of the upper (X) 4.2.2.3 Minimum height of the upper (Xmhu) to be tested The minimum height of the upper be tested with the electrical tests (5.2) is given in Table 1. NOTE The minimum height of the upper to be tested is given as 40 % of the height of the upper footwear, as given the Table 4 of EN ISO 20345:2011 (for type B-C and D). Table 1 — Minimum height (Xmhu) to be tested Footwear size Height (Xmhu) French size UK size Design A mm Design B mm Design C mm Design D mm 36 and below up to 3 1/2 35 41 65 102 37 and 38 4 to 5 35 42 66 104 39 and 40 5 1/2 to 6 1/2 35 44 69 108 41 and 42 7 to 8 35 45 71 112 43 and 44 8 1/2 to 10 35 47 74 116 45 and above 10 1/2 and above 35 48 77 120 4.2.2.4 Minimum height of the upper The minimum height of the upper (Hum) is given by Formula (1): Hum = Xmhu + h (1) SIST EN 50321-1:2018

EN 50321-1:2018 (E) 10 where Hum
minimum height of the upper Xmhu minimum height of upper to be tested h

clearance to the level of water (see Table 5) 4.2.2.5 Requirement for the height of the upper The height of the upper of the footwear (X) is measured on the 3 tested sizes (smallest, largest and medium). For each size (X) shall be greater or equal to Hum (see 4.2.2.4). 4.3 Electrical requirements Electrical Insulating footwear and overboots shall pass an AC proof voltage test and a withstand voltage test according to its electrical classification, Additional DC voltage testing on electrical insulating footwear and overboots shall pass an AC proof voltage test and withstand test and a DC proof voltage test. Table 2 — Proof test voltage, proof test current and withstand test voltage for footwear Class of footwear AC Proof test voltage kV r.m.s. AC Proof test current mA r.m.s. AC Withstand test voltage kV r.m.s.

DC Proof voltage average kV Design (EN ISO 20345/EN ISO 20347) A B C D 00 2,5 1 1,5 2 3 5 10 0 5 2 2,5 4 5 10 20 1 10 N/a N/a 8 10 20 40 2 20 N/a N/a 18 18 30 50 3 30 N/a N/a 20 20 40 N/a 4 40 N/a N/a 24 24 50 N/a N/a – not applicable Table 3 — Proof test voltage, proof test current and withstand test voltage for overboots Class of footwear AC Proof test voltage kV r.m.s. AC Proof test current mA r.m.s. AC Withstand test voltage kV r.m.s.

DC Proof voltage average kV Design A B C D 00 2,5 2 3 4 5 5 10 0 5 5 6 7 8 10 20 1 10 N/a N/a 15 16 20 40 2 20 N/a N/a 18 18 30 50 3 30 N/a N/a 20 20 40 N/a 4 40 N/a N/a 24 24 50 N/a N/a – not applicable 4.4 Marking 4.4.1 The electrical insulating footwear and overboots shall be first marked according to Clause 7 of EN ISO 20345:2011 or Clause 7 of EN ISO 20347:2012 or Clause 7 of EN ISO 20346:2014 Additional marking to comply with this standard shall be the following: SIST EN 50321-1:2018

EN 50321-1:2018 (E) 11 Each electrical insulating footwear or overboots which claims to comply with the requirements of this standard, shall bear a label and/or marking giving the following information: — symbol IEC 60417-5216:2002-10–Suitable for live working; double triangle (see Annex B); NOTE The exact ratio of the height of the figure to the base of the triangle is 1,43. For the purpose of convenience, this ratio can be between the values of 1,4 and 1,5. — number of EN 50321:201X standard immediately adjacent to the symbol; — electrical class; — voltage current tested “AC” or “AC/DC” according to voltage testing applied. In addition, each unit of electrical insulating footwear or overboots shall have a strip or space to note the date of first use, the date of examination or the date of each periodic inspection. This shall be located near the IEC symbol. Marking shall be on the external surface of the electrical insulating footwear or overboots and shall be clearly visible and legible to a person with normal or corrected vision without additional magnification. The marking or label shall not impair the electrical and mechanical properties of the electrical insulating footwear or overboots. It shall be durable and shall remain visible after being subjected to a durability test 5.3. 4.4.2 If a colour code is used, the symbol (double triangle) shall correspond to the following: — Class 00 – beige; — Class 0 – red; — Class 1 – white; — Class 2 – yellow; — Class 3 – green; — Class 4 – orange. 4.5 Packaging The packaging type suitable for transportation of the electrical insulating footwear or overboots shall be defined by the manufacturer. Each pair of electrical insulating footwear or overboots shall be packed in individual container or package. The outside of packaging shall be marked with the name of the manufacturer or supplier, classification, size and design. 4.6 Information to be supplied by manufacturer Each pair of electrical insulating footwear or overboots shall be accompanied by the instructions for use, which contain the information necessary for use, maintenance and the potential risk of limited effectiveness of electrical insulation according to conditions of use (i.e. mechanical or chemical aggression). The information supplied by the manufacturer shall conform to EN ISO 20345:2011, 8.1 or EN ISO 20346:2014, 8.1 or EN ISO 20347:2012, 8.1. The instructions for use shall contain a) explanation of the symbol “double triangle”; b) storage; SIST EN 50321-1:2018

EN 50321-1:2018 (E) 12 c) examination before use; d) precaution of use; e) periodic inspection. Guidance to the use of electrical insulating footwear and overboots is given in Annex A. 5 Testing 5.1 General Electrical insulating footwear or overboots which have been subjected to type tests shall not be reused. The order of type tests that are carried out is given in Annex C. 5.2 Electrical tests 5.2.1 General Electrical testing shall be carried out on AC or ac/DC voltage and at a temperature of 23 °C ± 5 °C and 45 % to 75 % relative humidity (see EN 60212). The electrical insulating footwear or overboots shall be given an AC or ac/dc proof and withstand test after conditioning for moisture absorption by total immersion in water for a period of 16 h ± 0,5 h. The immersion shall be carried out without trapping air. After this period the footwear or overboots shall be emptied of water and conditioned in an upright position standing on its sole for a period of 45 min ± 15 min at 23°C ± 5°C) and 45 % to 75 % humidity. The AC or DC electric tests shall be conducted within 1 h after completion of conditioning. The clearances between the open part of the footwear and overboots with the water line are given in Table 4. Table 4 — Clearances to the level of water Class Clearance (h) mm For AC proof test Clearance (h) mm For AC withstand test Clearance (h) mm For DC proof test 00 30 30 40 0 40 40 90 1 70 90 120 2 90 120 130 3 120 130 N/a 4 130 150 N/a N/a – not applicable NOTE Tolerance for clearance distance is ± 3 mm The inner of the electrical insulating footwear or overboots is filled with tap water. Electrical Insulating overboots are tested without corresponding footwear Electrical proof and withstand tests shall be performed on whole electrical insulating footwear or overboots, which fulfil the declared non-electrical requirements. Three pairs (left and right) of electrical insulating footwear or overboots are to be tested, they shall meet the test requirements, including one pair the smallest size, one pair from the largest size and one pair of the middle size. SIST EN 50321-1:2018

EN 50321-1:2018 (E) 13 After electrical testing, the electrical insulating footwear or overboot shall not be used. These tests are considered as destructive. 5.2.2 Type tests 5.2.2.1 Test equipment The test equipment used in both the proof and withstand tests shall be capable of supplying an essentially stepless and continuously variable voltage to the footwear under test. The test equipment shall provide a uniformed rate. Motor-driven regulating equipment will provide a uniformed rate of rise to the test voltage. The test apparatus shall be protected by an automatic circuit-breaking device designed to open promptly on the current produced by failure of the footwear or overboots under test. This circuit-breaking device shall be designed to protect the test equipment under any conditions of short circuit. The AC proof test current is measured directly by inserting a milliameter in series with each unit of footwear or overboots in turn. It is recommended that the testing equipment system be inspected and calibrated at least annually to ensure that the general condition of the equipment is acceptable, and to verify the characteristics and accuracy of the test voltage. To eliminate damaging ozone and possible flashover along the collar, there should be a sufficient flow of air into and around the footwear and an exhaust system to adequately remove ozone from the test machine. Consistent ozone checking during the test procedure should be carried out to ascertain the adequacy of the exhaust system. Test arrangements, power sources and procedures shall be in accordance with EN 60060-1. The peak (crest) or r.m.s. value of the AC voltage shall be measured with an error of not more than 3 %. The peak to peak AC ripple value of the DC proof test voltage shall be measured with a value not more than 3 % of the average value under no load conditions. Footwear and overboot failure indicators or accessory circuits shall be designed to give positive indication of failure. SIST EN 50321-1:2018

EN 50321-1:2018 (E) 14

Key 1 connection to the voltage source 2 tank 3 water 4 electrode to connect water to the two poles of voltage source 5 clearance from open part of the footwear or overboot to the water line 6 height of the upper (X) 7 height of the water Figure 4 — Arrangement of electrical tests 5.2.2.2 Electrical test procedure After conditioning the footwear or overboots shall be filled with tap water (see Figure 3) having a specific

and immersed in a tank of water with the same specific resistivity. The water level during the test shall be the same inside and outside the footwear or overboot. The water inside the footwear or overboot, that forms one electrode shall be connected to one terminal of the voltage source that dips into the water. The water in the tank outside the footwear or overboot that forms the other electrode shall be connected directly to the other terminal of the voltage source. The water shall be free of air bubbles and air pockets and the exposed portion of the footwear or overboot above the water line shall be dry on the outer surface. The clearance between the open part of the footwear or overboot and the water line is given in Table 4. NOTE

It is customary to make this type of high-voltage test with one end of the circuit grounded. When proof current tests are made on one piece of footwear or overboot at a time, the water in the tank is usually connected to the grounded end of the high-voltage circuit. The milliammeter is connected in the grounded end of the circuit and shunted by a short-SIST EN 50321-1:2018

EN 50321-1:2018 (E) 15 circuiting, automatic self-closing switch which keeps the circuit closed except at the instant of reading and thus maintains an uninterrupted ground. When proof current tests are made on more than one piece of footwear or overboot at one time, the water in the tank should be at hi

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