Safety of machinery - Safety requirements for machinery and equipment for production of steel by electric arc furnaces

This European Standard specifies the general safety requirements for electric arc furnaces (EAF) to melt steel not containing radioactive material.
This European Standard deals with all significant hazards, hazardous situations and events pertinent to EAF, when used as intended and under conditions foreseen by the manufacturer, but also includes foreseeable faults and malfunctions in case of misuse.
This European Standard specifies also criteria for the plant and equipment integrated in the production process.
This European Standard specifies the requirements to ensure the safety of persons which are to be met during the design, assembly, transport, commissioning, operation, maintenance and decommissioning of the equipment.
This European Standard assumes that installations are operated and maintained by adequately trained and competent personnel. Manual intervention for setting, adjustment and maintenance is accepted as part of the normal use of the equipment.
This European Standard covers the following equipment (see Annex B):
-   EAF with AC technology (alternating current);
-   EAF with DC technology (direct current);
-   scrap pre-heating technology;
-   associated equipment/devices according Annex B.
The following equipment is not covered by this European Standard:
-   induction furnace;
-   resistance-arc furnace;
-   electron beam furnace;
-   plasma furnace;
-   other electrical furnaces used in secondary steelmaking.
This European Standard does not specify safety requirements for the following equipment, which can be an integral or complementary part of the equipment covered by the Scope:
a)   cranes;
b)   scrap basket;
c)   transport car for scrap basket;
d)   elephant house (furnace encasing for environmental reasons);
e)   separate scrap drying equipment.

Sicherheit von Maschinen - Sicherheitsanforderungen für Anlagen und Einrichtungen zur Erzeugung von Stahl mittels Elektrolichtbogenofen

Diese Europäische Norm legt die allgemeinen Sicherheitsanforderungen für Elektrolichtbogenöfen (ELO) beim Schmelzen von Stahl ohne radioaktives Material fest.
Diese Europäische Norm legt die vorhersehbaren, signifikanten Gefährdungen, Gefährdungssituationen und
ereignisse für einen ELO fest, wenn dieser bestimmungsgemäß und unter vom Hersteller vorhersehbaren Zuständen genutzt wird, schließt aber auch vorhersehbare Fehler und Fehlfunktionen im Falle von Fehl-gebrauch ein.
Diese Europäische Norm legt auch Merkmale für Anlagen und Einrichtungen fest, die in den Produktions-prozess integriert sind.
Diese Europäische Norm legt die zu erfüllenden Anforderungen fest, um die Sicherheit von Personen während der Konstruktion, des Baus, des Transports, der Inbetriebnahme, des Betriebs, der Wartung und der Außerbetriebnahme sicherzustellen.
Diese Europäische Norm geht davon aus, dass die Anlagen von entsprechend geschultem und fähigem Personal bedient und gewartet werden. Manuelles Eingreifen zur Einstellung, Anpassung und Wartung wird als Teil des Normalbetriebs der Ausrüstung akzeptiert.
Diese Europäische Norm gilt für folgende Ausrüstung (siehe Anhang B):
-   Elektrolichtbogenofen mit AC Technologie (Wechselstrom);
-   Elektrolichtbogenofen mit DC Technologie (Gleichstrom);
-   Schrottvorwärmungs Technologie;
-   zugehörige Ausrüstung/Geräte, entsprechend Anhang B.
Die nachfolgende Ausrüstung wird nicht durch diese Europäische Norm abgedeckt:
-   Induktionsofen;
-   Lichtbogen Widerstandsofen;
-   Elektrostrahlofen;
-   Plasmaofen;
-   andere Elektroöfen, die in der Sekundärmetallurgie verwendet werden.
Diese Europäische Norm legt keine Sicherheitsanforderungen an die folgende Ausrüstung fest, die ein integraler oder ergänzender Teil der Ausrüstung sein kann, die durch den Geltungsbereich abgedeckt ist:
a)   Krane;
b)   Schrottkorb;
c)   Transportwagen für Schrottkörbe;
d)   Ofen Einhausung/"Elephant house" (Ofenumhüllung aus Umweltschutzgründen);
(...)

Sécurité des machines - Exigences de sécurité pour les machines et les équipements pour la production d'acier par four à arc électrique

La présente Norme européenne spécifie les exigences de sécurité générales pour les fours à arc électrique (FAE) utilisés pour la fusion de l’acier ne contenant pas de matériau radioactif.
La présente Norme européenne traite tous les phénomènes, situations et événements dangereux significatifs pertinents pour les FAE, lorsqu'ils sont utilisés comme prévu et dans des conditions prévues par le fabricant, mais inclut aussi des défauts et défaillances prévisibles en cas de mauvais usage.
La présente Norme européenne spécifie aussi des critères pour l'usine et l'équipement intégré dans le processus de production.
La présente Norme européenne spécifie également les exigences pour assurer la sécurité des personnes devant être impliquées lors de la conception, de l’assemblage, du transport, de la mise en service, du fonctionnement, de la maintenance et de la mise hors service des équipements.
La présente Norme européenne suppose que les installations sont utilisées et entretenues par du personnel compétent ayant reçu une formation appropriée. Une intervention manuelle pour le réglage, l’ajustage et la maintenance est acceptée comme partie intégrante de l’utilisation normale des équipements.
La présente Norme européenne couvre les équipements suivants (voir Annexe B) :
-   fours à arc électrique avec technologie du CA (courant alternatif) ;
-   fours à arc électrique avec technologie du CC (courant continu) ;
-   technique de préchauffage des déchets ;
-   équipements/dispositifs associés selon l’Annexe B.
La présente Norme européenne ne couvre pas les équipements suivants :
-   four à induction ;
-   four à résistance ;
-   four à bombardement électronique ;
-   four à plasma ;
-   autres fours électriques utilisés en métallurgie secondaire.

Varnost strojev - Varnostne zahteve za stroje in opremo za proizvodnjo jekla z električnimi obločnimi pečmi

Ta evropski standard določa splošne varnostne zahteve za električne obločne peči (EAF) za taljenje jekla, ki ne vsebuje radioaktivnih materialov. Ta evropski standard obravnava vse bistvene nevarnosti, nevarne situacije in dogodke, pomembne za električne obločne peči, ko se uporabljajo kot predvideno in pod pogoji, ki jih predvidi proizvajalec, vključuje pa tudi predvidljive napake in okvare v primeru napačne uporabe. Ta evropski standard tudi določa merila za obrat in opremo, vključeno v proizvodni proces. Ta evropski standard določa zahteve za zagotavljanje varnosti oseb, ki so vključene v načrtovanje, sestavljanje, prevoz, usposobitev za zagon, delovanje, vzdrževanje in izločitev opreme iz uporabe. Ta evropski standard predvideva, da inštalacije upravlja in vzdržuje primerno usposobljeno in  pristojno osebje. Ročni posegi v nastavitve, prilagoditve in vzdrževanje so sprejemljivi kot del normalne uporabe te opreme.
Ta evropski standard zajema naslednjo opremo (glej Dodatek B):
- električne obločne peči s tehnologijo izmeničnega toka;
- električne obločne peči s tehnologijo enosmernega toka;
- tehnologijo predogrevanja sekundarnih surovin;
- povezano opremo/naprave v skladu z Dodatkom B.
Ta evropski standard ne zajema naslednje opreme:
- indukcijskih peči;
- uporovnih obločnih peči;
- peči z elektronskim žarkom;
- plazemskih peči;
- drugih električnih peči, ki se uporabljajo v sekundarni proizvodnji jekla.
Ta evropski standard ne določa varnostnih zahtev za naslednjo opremo, ki je lahko vgrajeni ali dodatni del opreme, ki jo zajema področje uporabe standarda:
a) za žerjave;
b) za koš za sekundarne surovine;
c) za vozilo, ki prevaža koš za sekundarne surovine;
d) za slonje ohišje (ohišje peči zaradi varovanja okolja);
e) za ločeno opremo za sušenje sekundarnih surovin.

General Information

Status
Published
Publication Date
06-Apr-2010
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
07-Apr-2010
Completion Date
07-Apr-2010

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Sicherheit von Maschinen - Sicherheitsanforderungen für Anlagen und Einrichtungen zur Erzeugung von Stahl mittels ElektrolichtbogenofenSécurité des machines - Exigences de sécurité pour les machines et les équipements pour la production d'acier par four à arc électriqueSafety of machinery - Safety requirements for machinery and equipment for production of steel by electric arc furnaces77.180Oprema za metalurško industrijoEquipment for the metallurgical industry25.180.10Electric furnaces13.110Varnost strojevSafety of machineryICS:Ta slovenski standard je istoveten z:EN 14681:2006+A1:2010SIST EN 14681:2007+A1:2010en,fr01-junij-2010SIST EN 14681:2007+A1:2010SLOVENSKI

STANDARD
SIST EN 14681:2007+A1:2010
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 14681:2006+A1
April 2010 ICS 25.180.10; 77.180 Supersedes EN 14681:2006English Version

Safety of machinery - Safety requirements for machinery and equipment for production of steel by electric arc furnaces

Sécurité des machines - Exigences de sécurité pour les machines et les équipements pour la production d'acier par four à arc électrique

Sicherheit von Maschinen - Sicherheitsanforderungen für Anlagen und Einrichtungen zur Erzeugung von Stahl mittels Elektrolichtbogenofen This European Standard was approved by CEN on 26 June 2006 and includes Amendment 1 approved by CEN on 28 February 2010.

CEN 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 Management Centre or to any CEN 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 CEN member into its own language and notified to the CEN Management Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 14681:2006+A1:2010: ESIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 2 Contents Page Foreword ..............................................................................................................................................................4Introduction .........................................................................................................................................................51Scope ......................................................................................................................................................62Normative references ............................................................................................................................73Terms, definitions and abbreviations ..................................................................................................93.1Terms and definitions ...........................................................................................................................93.2Abbreviations ...................................................................................................................................... 104List of significant hazards ................................................................................................................. 115Safety requirements and/or measures ............................................................................................. 115.1General ................................................................................................................................................. 115.1.1General design requirements ............................................................................................................ 115.1.2Electrical melting power supply ........................................................................................................ 125.1.3Electrical low voltage supply ............................................................................................................. 125.1.4Grounding of mechanical furnace parts .......................................................................................... 125.1.5Fluid systems ...................................................................................................................................... 125.1.6Linked equipment ............................................................................................................................... 135.1.7!Ergonomic principles .................................................................................................................... 135.1.8Leakage from hydraulic system and EAF-Transformer .................................................................. 145.1.9Access ................................................................................................................................................. 145.1.10Safety control system ........................................................................................................................ 145.1.11Harmful areas ...................................................................................................................................... 145.1.12Blocking device for tilting platform .................................................................................................. 155.1.13Gantry movement ............................................................................................................................... 155.1.14Loss of energy .................................................................................................................................... 155.1.15Electrode clamp .................................................................................................................................. 155.1.16Pulpit .................................................................................................................................................... 155.1.17Personal protective equipment (PPE) .............................................................................................. 165.1.18Warning devices and safety signs" ................................................................................................. 165.1.19!Surface temperatures and heat radiation ........................................................................................ 165.1.20Noise ..................................................................................................................................................... 165.1.21Vibrations" ........................................................................................................................................ 175.2List of significant hazards, hazardous situations, safety requirements and/or measures ......... 175.2.2EAF including scrap pre-heating ...................................................................................................... 195.3Special requirements for explosion prevention and protection .................................................... 215.4Noise reduction as a safety requirement ......................................................................................... 225.4.1Noise reduction at source by design ................................................................................................ 225.4.2Noise reduction by protective measures ......................................................................................... 235.4.3Noise reduction by information ......................................................................................................... 236Verification of the safety requirements and/or measures .............................................................. 237Information for use ............................................................................................................................. 247.1General ................................................................................................................................................. 247.2Warning devices and safety signs .................................................................................................... 247.3Accompanying documents ................................................................................................................ 247.3.1Instruction handbook ......................................................................................................................... 247.3.2Machine/equipment declaration ........................................................................................................ 247.3.3Instruction for transportation and assembly of the equipment ..................................................... 257.3.4Information about commissioning and dismantling of the equipment ......................................... 257.3.5Operation instructions concerning the equipment ......................................................................... 26SIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 3 7.3.6Maintenance manual ........................................................................................................................... 277.4Minimum marking ................................................................................................................................ 277.5Training of personnel .......................................................................................................................... 28Annex A (normative)

Noise test code ............................................................................................................. 29Annex B (normative)

Equipment covered by this European Standard ....................................................... 33Annex C (informative)

Examples of electric arc furnaces ............................................................................ 35Annex ZA (informative)

!Relationship between this European Standard and the Essential Requirements of EU Directive 2006/42/EC" .................................................................................. 37Annex ZB (informative)

Relationship between this European Standard and the Essential Requirements of EU Directive 94/9/EC .............................................................................................. 38Bibliography ...................................................................................................................................................... 39 Figures Figure B.1 — Specification of equipment covered by this standard (solid line) and take over points of linked equipment (dashed line) ............................................................................................................... 34 Figure C.1 — Example of an EAF .................................................................................................................... 35 Figure C.2 — Example of an EAF: Single shaft furnace with scrap preheating system ........................... 36

Tables Table 1 — Significant hazards, hazardous situations, safety requirements and/or measures ................ 18 Table A.1 — Example of declared dual-number noise emission values .................................................... 32 Table B.1 — EAF with AC technology ............................................................................................................ 33 Table B.2 — EAF with DC technology ............................................................................................................ 33 Table B.3 — Auxiliaries .................................................................................................................................... 33

SIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 4 Foreword This document (EN 14681:2006+A1:2010) has been prepared by Technical Committee CEN/TC 322 “Equipments for making and shaping of metals - Safety requirements”, the secretariat of which is held by DIN. 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 October 2010, and conflicting national standards shall be withdrawn at the latest by October 2010. This document includes Amendment 1, approved by CEN on 2010-02-28. This document supersedes EN 14681:2006. The start and finish of text introduced or altered by amendment is indicated in the text by tags!"Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annexes ZA and ZB, which are integral parts of this document. This European Standard was elaborated by CEN/TC 322/WG1 comprising experts from the following countries: Austria, Germany, Italy and Sweden. NOTE Initially it was planned to prepare this European Standard as a part of the standard series EN 746 "Industrial thermoprocessing equipment". As a result of the time gap between the elaboration of EN 746-1:1997 and this European Standard the goal could not be achieved because of a diverging technical level in both standards. For the next revision of both standards it is foreseen to reconsider the initial plan. According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

SIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 5 Introduction This European Standard is a type C standard as stated in EN ISO 12100. The machinery concerned and the extent to which hazards, hazardous situations and events are covered are indicated in the scope of this European Standard. When provisions of this type C standard are different from those which are stated in type A or B standards, the provisions of this type C standard take precedence over the provisions of the other standards, for machines that have been designed and built according to the provisions of this type C standard. Where for clarity an example of a preventive measure is given in this European Standard, this should not been considered as the only possible solution. Any other solution leading to the same risk reduction is permissible if an equivalent level of safety is achieved.

SIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 6 1 Scope This European Standard specifies the general safety requirements for electric arc furnaces (EAF) to melt steel not containing radioactive material. This European Standard deals with all significant hazards, hazardous situations and events pertinent to EAF, when used as intended and under conditions foreseen by the manufacturer, but also includes foreseeable faults and malfunctions in case of misuse. This European Standard specifies also criteria for the plant and equipment integrated in the production process. This European Standard specifies the requirements to ensure the safety of persons which are to be met during the design, assembly, transport, commissioning, operation, maintenance and decommissioning of the equipment. This European Standard assumes that installations are operated and maintained by adequately trained and competent personnel. Manual intervention for setting, adjustment and maintenance is accepted as part of the normal use of the equipment. This European Standard covers the following equipment (see Annex B):  EAF with AC technology (alternating current);  EAF with DC technology (direct current);  scrap pre-heating technology;  associated equipment/devices according Annex B. The following equipment is not covered by this European Standard:  induction furnace;  resistance-arc furnace;  electron beam furnace;  plasma furnace;  other electrical furnaces used in secondary steelmaking. This European Standard does not specify safety requirements for the following equipment, which can be an integral or complementary part of the equipment covered by the Scope: a) cranes; b) scrap basket; c) transport car for scrap basket; d) elephant house (furnace encasing for environmental reasons); e) separate scrap drying equipment.

SIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 7 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 614-1, Safety of machinery — Ergonomic design principles — Part 1: Terminology and general principles EN 614-2, Safety of machinery — Ergonomic design principles — Part 2: Interactions between the design of machinery and work tasks EN 842, Safety of machinery — Visual danger signals — General requirements, design and testing EN 894-1, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 1: General principles for human interactions with displays and control actuators EN 894-2, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 2: Displays EN 894-3, Safety of machinery — Ergonomics requirements for the design of displays and control actuators — Part 3: Control actuators EN 981, Safety of machinery — System of auditory and visual danger and information signals EN 982:1996, Safety of machinery — Safety requirements for fluid power systems and their components — Hydraulics EN 983:1996, Safety of machinery — Safety requirements for fluid power systems and their components — Pneumatics EN 1037:1995, Safety of machinery — Prevention of unexpected start-up EN 1088:1995, Safety of machinery — Interlocking devices associated with guards — Principles for design and selection EN 1127-1, Explosive atmospheres — Explosion prevention and protection — Part 1: Basic concepts and methodology EN 1299, Mechanical vibration and shock — Vibration isolation of machines — Information for the application of source isolation EN 1837, Safety of machinery — Integral lighting of machines EN 12198-3, Safety of machinery — Assessment and reduction of risks arising from radiation emitted by machinery — Part 3: Reduction of radiation by attenuation or screening EN 12464-1, Light and lighting — Lighting of work places — Part 1: Indoor work places EN 13463-1:2009, Non-electrical equipment for use in potentially explosive atmospheres — Part 1: Basic method and requirements EN 13463-5, Non-electrical equipment intended for use in potentially explosive atmospheres — Part 5: Protection by constructional safety “c” EN 14253, Mechanical vibration — Measurement and calculation of occupational exposure to whole-body vibration with reference to health — Practical guidance SIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 8 EN 50171, Central power supply systems EN 60079-0, Electrical apparatus for explosive gas atmospheres — Part 0: General requirements (IEC 60079-0:2004, modified) EN 60204-1:2006, Safety of machinery — Electrical equipment of machines — Part 1: General requirements (IEC 60204-1:2005, modified) EN 60204-11; Safety of machinery — Electrical equipment of machines — Part 11: Requirements for HV equipment for voltages above 1000 V a.c. or 1500 V d.c. and not exceeding 36 kV (IEC 60204-11:2000) EN 60447, Basic and safety principles for man-machine interface — Marking and identification — Actuating principles (IEC 60447:2004) EN 60519-4:2006, Safety in electroheat installations — Part 4: Particular requirements for arc furnace installations (IEC 60519-4:2006) EN 61310-1, Safety of machinery — Indication, marking and actuation — Part 1: Requirements for visual, acoustic and tactile signals (IEC 61310-1:2007) EN 61310-2, Safety of machinery — Indication, marking and actuation — Part 2: Requirements for marking (IEC 61310-2:2007) EN ISO 4871:1996, Acoustics — Declaration and verification of noise emission values of machinery and equipment (ISO 4871:1996) EN ISO 6682, Earth-moving machinery — Zones of comfort and reach for controls (ISO 6682:1996, including Amd 1:1989) EN ISO 7731, Ergonomics — Danger signals for public and work areas — Auditory danger signals

(ISO 7731:2003) EN ISO 11064-1, Ergonomic design of control centres — Part 1: Principles for the design of control centres (ISO 11064-1:2000) EN ISO 11202:1995, Acoustics — Noise emitted by machinery and equipment — Measurement of emission sound pressure levels at a work station and at other specified positions — Survey method in situ

(ISO 11202:1995) EN ISO 11688-1, Acoustics — Recommended practice for the design of low-noise machinery and equipment — Part 1: Planning (ISO/TR 11688-1:1995) EN ISO 12100-1:2003, Safety of machinery — Basic concepts, general principles for design — Part 1: Basic terminology, methodology (ISO 12100-1:2003) EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2: Technical principles (ISO 12100-2:2003) EN ISO 13732-1, Ergonomics of the thermal environment — Methods for the assessment of human responses to contact with surfaces — Part 1: Hot surfaces (ISO 13732-1:2006) EN ISO 13849-1:2008, Safety of machinery — Safety-related parts of control systems — Part 1: General principles for design (ISO 13849-1:2006) EN ISO 13850:2008, Safety of machinery — Emergency stop — Principles for design (ISO 13850:2006) EN ISO 13857:2008, Safety of machinery — Safety distances to prevent hazard zones being reached by upper and lower limbs (ISO 13857:2008) SIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 9 EN ISO 14121-1, Safety of machinery — Risk assessment — Part 1: Principles (ISO 14121-1:2007) EN ISO 14122-1, Safety of machinery — Permanent means of access to machinery — Part 1: Choice of fixed means of access between two levels (ISO 14122-1:2001) EN ISO 14122-2, Safety of machinery — Permanent means of access to machinery — Part 2: Working platforms and walkways (ISO 14122-2:2001) EN ISO 14122-3, Safety of machinery — Permanent means of access to machinery — Part 3: Stairs, stepladders and guard-rails (ISO 14122-3:2001) EN ISO 14122-4, Safety of machinery — Permanent means of access to machinery — Part 4: Fixed ladders (ISO 14122-4:2004) ISO 3864-1, Graphical symbols — Safety colours and safety signs — Part 1: Design principles for safety signs in workplaces and public areas ISO 7000, Graphical symbols for use on equipment — Index and synopsis" 3 Terms, definitions and abbreviations 3.1 Terms and definitions For the purpose of this document, the terms and definitions given in EN ISO 12100:2003 and the following apply. NOTE Definition used in EN and ISO standards referred to in this European Standard are also valid for this European Standard. 3.1.1 charge material material which is charged into the furnace, e.g. steel scrap 3.1.2 standard cycle time period between two consecutive tappings with defined power-on and power-off time 3.1.3 hydraulic fluid fluid used to transmit force via hydraulic pressure (see EN ISO 6743-4) 3.1.4 fire-resistant fluid fluid with low flame propagation (see ISO 5598) 3.1.5 ladle vessel to collect, transport and discharge molten steel 3.1.6 pulpit room in which the control desk and monitoring facilities for a machine or equipment are located 3.1.7 control stand free standing control desk to operate the equipment locally SIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 10 3.1.8 tilting movement of the furnace to discharge molten steel or slag from foreseen openings 3.1.9 blocking device device to block the equipment in the desired position 3.1.10 high voltage switch gear furnace breaker to connect and disconnect the EAF to/from electrical high voltage supply 3.1.11 reactor device to increase the reactance of the EAF system 3.1.12 furnace transformer device for the transformation of the high voltage electrical supply to arc voltage 3.1.13 alloying system device to store and feed any metallic and non-metallic materials to/into the EAF 3.1.14 electrode nippling system device, in which electrode strands can be stored or new electrode sections are added 3.1.15 dog house furnace enclosure serving as indirect fume extraction system and minimising noise propagation 3.1.16 fume extraction system equipment for the collection of created off-gas during operation (direct and/or indirect system) 3.1.17 bus bar system high-current connection-line between transformer and cable 3.1.18 linked equipment equipment which may be connected to an EAF 3.1.19 trained personnel persons with the knowledge of systems, background, experience and ability to operate and/or maintain the equipment in the way intended 3.2 Abbreviations For the purpose of this document, the following abbreviations apply. AC Alternating Current; DC Direct Current; EAF Electric Arc Furnace. SIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 11 4 List of significant hazards This clause contains all significant hazards, hazardous situations and events, as far as they are dealt with in this European Standard, identified by risk assessment as significant for this type of machinery and which requires action to eliminate or reduce the risk: a) potentially hazardous situations having significant risks; b) the safety requirements and/or measures which shall be incorporated into the machinery/equipment; c) special instructions which shall be communicated to the user. The significant hazards and hazardous situations identified are listed in columns 1 and 2 of 5.2, Table 1. In addition it is important for the manufacturer to carry out a risk assessment according to

!EN ISO 14121-1" to identify any other relevant hazard of the machine/equipment and take measures to eliminate or minimize the risk. 5 Safety requirements and/or measures 5.1 General 5.1.1 General design requirements Electric arc furnace and equipment conforming to this European Standard shall comply with the safety requirements and/or measures of this clause. This European Standard assumes that:  machinery and equipment are operated and maintained by adequately trained and competent personnel. Manual intervention for setting, adjustment and maintenance is accepted as part of the normal use of the equipment;  machinery is used with adequate workplace lighting conforming to EN 12464-1 or to local regulations. The manufacturer shall undertake and record design calculations of the structural assembly, e.g. steel sections, auxiliaries and service as part of the equipment which shall be stable, suitable for function and intended use. Safety devices shall be protected against damage. In particular, they shall be robust to withstand continuous operation in the respective area. In particular the design shall include requirements and constructional details with respect to, e.g.:  accessibility;  guards and protection;  maintenance openings and clearance gaps for cleaning;  escape routes;  movement of machinery and material;  safety during operation; SIST EN 14681:2007+A1:2010

EN 14681:2006+A1:2010 (E) 12  safety devices, e.g. hold-to-run control, emergency stop;  requirements for fluid and gas systems;  slag area, e.g. heat protected;  emergency pit for liquid steel being able to contain the volume of the EAF. 5.1.2 Electrical melting power supply The electrical melting power supply, comprising of the high voltage switch gear, reactor (if applicable), furnace transformer, AC/DC converters (if applicable) and interconnecting bus bar systems and cables, shall meet the requirements as defined in EN 60204-1 and/or EN 60204-11. 5.1.3 Electrical low voltage supply The electrical low voltage supply, comprising of low voltage switch gear, control system and low voltage cables, shall meet the requirements as defined EN 60204-1 and/or !EN ISO 13849-1". 5.1.4 Grounding of mechanical furnace parts To prevent potential differences between mechanical furnace parts, all of these parts shall be connected to each other and grounded according Clause 10 of !EN 60519-4:2006". 5.1.5 Fluid systems 5.1.5.1 !Hydraulic, pneumatic, cooling and lubrication systems" Hydraulic and pneumatic fluid systems and their components shall meet the requirements as defined in EN 982 and EN 983. Instruction shall be given in the information for use about systems filled with fluids, which are likely to solidify and/or change viscosity under extreme environmental temperatures and which may cause hazardous situations. Cooling systems, hydraulic and lubrication systems shall account for risks created by temperature and pressure, ignition sources, including fire and toxic effects, as well as gas/dust reactions. Instructions shall be given for small and large water leakages inside

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