EN 50444:2008
(Main)Basic standard for the evaluation of human exposure to electromagnetic fields from equipment for arc welding and allied processes
Basic standard for the evaluation of human exposure to electromagnetic fields from equipment for arc welding and allied processes
This European Standard applies to equipment for arc welding and allied processes designed for use in industrial or domestic environments, including welding power sources, wire feeders and ancillary equipment, e.g. torches, liquid cooling systems and arc striking and stabilising devices. NOTE Allied processes are for example electric arc cutting and arc spraying. This standard specifies procedures for assessment of electromagnetic fields produced by arc welding equipment and defines standardized operating conditions and test set-ups. This standard may be used as a basis to demonstrate compliance to national and international guidelines or requirements with regard to human exposure to EMF from arc welding equipment [1] [2]. Other standards may apply to products covered by this standard. In particular this standard can not be used to demonstrate electromagnetic compatibility with other equipment; nor does it specify any product safety requirements other than those specifically related to human exposure to electromagnetic fields.
Grundnorm zur Ermittlung der Exposition von Personen gegenüber elektromagnetischen Feldern von Einrichtungen zum Lichtbogenschweißen und artverwandten Prozessen
Diese Norm gilt für Einrichtungen zum Lichtbogenschweißen und für artverwandte Prozesse für den Gebrauch im Industrie- oder Wohnbereich, einschließlich Schweißstromquellen, Drahtvorschubgeräte und Zusatzeinrichtungen, wie z.B. Brenner, Flüssigkeitskühlgeräte und Lichtbogenzünd- und Stabilisierungseinrichtungen. ANMERKUNG Verwandte Prozesse sind beispielsweise Elektrolichtbogenschneiden und Lichtbogenspritzen. Diese Norm legt Verfahren zur Bewertung der von Lichtbogenschweißeinrichtungen erzeugten elektromagnetischen Felder fest und definiert genormte Betriebsbedingungen und Messanordnungen. Dieses Dokument kann als Grundlage zum Nachweis der Einhaltung von nationalen und internationalen Richtlinien und Anforderungen hinsichtlich der Exposition von Personen gegenüber den von Lichtbogenschweißeinrichtungen erzeugten elektromagnetischen Feldern (EMF) verwendet werden [1] [2]. Für Produkte, für die diese Norm gilt, können weitere Normen anwendbar sein. Im Besonderen ist diese Norm weder dafür vorgesehen, elektromagnetische Verträglichkeit mit anderen Einrichtungen nachzuweisen, noch spezifiziert sie andere Produktsicherheitsanforderungen als jene, die sich speziell auf die Exposition von Personen durch elektromagnetische Felder beziehen.
Norme de base pour l'évaluation de l'exposition des personnes aux champs électromagnétiques d'un équipement pour le soudage à l'arc et les techniques connexes
La présente Norme Européenne s’applique au matériel de soudage électrique et des techniques connexes conçu pour l’utilisation dans les environnements industriels ou domestiques, incluant les sources de courant de soudage, les dévidoirs et l’équipement auxiliaire, par exemple les torches, les systèmes de refroidissement par liquide et les dispositifs d'amorçage et de stabilisation de l'arc. NOTE Des techniques connexes sont par exemple le coupage à l’arc électrique et la projection à l'arc électrique. La présente norme établit des procédures d’évaluation des champs électromagnétiques produits par le matériel de soudage électrique et définit des conditions de service normalisées ainsi que les montages d'essai. La présente norme peut servir de base pour montrer la conformité aux guides nationaux et internationaux ou aux exigences relatives à l'exposition humaine aux champs électromagnétiques émanant du matériel de soudage électrique [1] [2]. D’autres normes peuvent s’appliquer à des produits couverts par cette norme. En particulier cette norme ne peut pas être utilisée pour démontrer la compatibilité électromagnétique avec d’autres matériels et elle ne spécifie aucune exigence de sécurité de produit autre que celles relevant spécifiquement de l’exposition humaine aux champs électromagnétiques.
Osnovni standard za oceno izpostavljenosti ljudi elektromagnetnim sevanjem opreme za obločno varjenje in sorodne postopke
General Information
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Standards Content (Sample)
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Basic standard for the evaluation of human exposure to electromagnetic fields from equipment for arc welding and allied processesNorme de base pour l'évaluation de l'exposition des personnes aux champs électromagnétiques d'un équipement pour le soudage à l'arc et les techniques connexesGrundnorm zur Ermittlung der Exposition von Personen gegenüber elektromagnetischen Feldern von Einrichtungen zum Lichtbogenschweißen und artverwandten Prozessen25.160.10Varilni postopki in varjenjeWelding processes13.280Varstvo pred sevanjemRadiation protectionICS:SIST EN 50444:2008en,fr,deTa slovenski standard je istoveten z:EN 50444:200801-junij-2008SIST EN 50444:2008SLOVENSKI
STANDARD
EUROPEAN STANDARD EN 50444 NORME EUROPÉENNE
EUROPÄISCHE NORM February 2008
CENELEC European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels
© 2008 CENELEC -
All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 50444:2008 E
ICS 13.280; 25.160.10
English version
Basic standard for the evaluation of human exposure
to electromagnetic fields from equipment
for arc welding and allied processes
Norme de base pour l'évaluation
de l'exposition des personnes
aux champs électromagnétiques
d'un équipement pour le soudage à l'arc et les techniques connexes
Grundnorm zur Ermittlung der Exposition von Personen gegenüber elektromagnetischen Feldern von Einrichtungen zum Lichtbogenschweißen und artverwandten Prozessen
This European Standard was approved by CENELEC on 2008-02-01. 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 Central Secretariat 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 Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Cyprus, the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom.
The text of the draft was submitted to the formal vote and was approved by CENELEC as EN 50444 on 2008-02-01. The following dates were fixed: – latest date by which the EN has to be implemented at national level by publication of an identical national standard or by endorsement
(dop)
2009-02-01 – latest date by which the national standards conflicting with the EN have to be withdrawn
(dow)
2011-02-01 This European Standard is to be read in conjunction with EN 50445. This European Standard has been prepared under mandates M/305 and M/351 given to CENELEC by the European Commission and the European Free Trade Association. __________
– 3 – EN 50444:2008 Contents 1 Scope.6 2 Normative references.6 3 Terms and definitions.6 3.1 General.6 3.2 Specific for arc welding and similar applications.8 4 Physical quantities, units and constants.9 4.1 Quantities and units.9 4.2 Constants.9 5 Assessment procedures.9 5.1 Arc welding equipment components to be tested.9 5.2 Assessment conditions.9 5.3 Averaging.9 5.4 Pulsed or non-sinusoidal welding current.9 5.4.1 General.9 5.4.2 Summation for basic restriction assessment.10 5.4.2.1 Summation of current density components without phase information.10 5.4.2.2 Summation of currents density components including phase information.10 5.4.2.3 Summation of specific absorption rate (SAR) components.11 5.4.3 Summation for reference level assessment.11 5.4.3.1 Summation for stimulation effects without phase information.11 5.4.3.2 Effective reference level method.12 5.4.3.3 Summation for stimulation effects including phase information.13 5.4.3.4 Summation for thermal effects.13 5.4.4 Equivalent frequency of induced current density waveforms.13 5.5 Conductivity of living tissue.14 5.6 Frequency range limitations.14 5.7 Application of assessment procedures.15 5.8 Measurements.16 5.8.1 Measuring equipment.16 5.8.2 Static field measurements.17 5.8.3 Time domain field measurements.17 5.8.4 Broadband field measurements.17 5.8.5 Frequency selective field measurements.17 5.8.6 Time domain weighted field measurements.18 5.9 Analytical calculations.18 5.9.1 General information.18 5.9.2 Derivation of magnetic field based on welding current.18 5.9.3 Derivation of induced current density based on magnetic field.19
Assessment parameters.26 Annex B (informative)
Examples for exposure assessment.30 Annex C (informative)
Numerical simulation using anatomical body models.39 Annex D (informative)
Geometry factor and field gradients.43 Annex E (informative)
Welding current ripple assessment.44 Annex F (informative)
Summation using first order filter weighting functions.46 Annex G (informative)
Example for an uncertainty budget.50 Bibliography.51
– 5 – EN 50444:2008 Figures Figure 1 – Average electrical conductivities for homogeneous body modelling from 10 Hz to 10 MHz.14 Figure A.1 – Probe position for measurement on welding cables.27 Figure A.2 – Topology of welding cable for numerical simulations.28 Figure B.1 – Probe position during measurement.31 Figure B.2 – Planar current density distribution in the disk.32 Figure B.3 – Welding current waveform and calculation parameters.33 Figure B.4 – Induced current density derived from welding current.33 Figure B.5 – Spectral components of welding current pulse.34 Figure B.6 – Summation of induced current density components with phase information.35 Figure B.7 – Flux density waveform and r.m.s. values of the spectral components.35 Figure B.8 – Flux density waveform and r.m.s. values of the spectral components.36 Figure B.9 – Summation of flux density components with phase information.37 Figure B.10 – Flux density waveform and r.m.s. values of the spectral components.37 Figure D.1 – Planar field distribution for different cable arrangements at I2 = 200 A.43 Figure E.1 – Spectral analysis of triangular function.44 Figure F.1 – Magnetic flux density reference levels, filter and tabulated values.47 Figure F.2 – Weighting function phase angles for B and H, filter and tabulated values.47 Figure F.3 – Induced current density basic restrictions, filter and tabulated values.48 Figure F.4 – Weighting function phase angles for J, filter and tabulated values.49 Figure F.5 – Comparison of results for example B.7 (first order filter left, tabulated values right).49 Tables Table 1 – Permissible assessment procedures for arc welding equipment.15 Table 2 – Permissible assessment procedures for welding cables.16 Table 3 – Reasonable expanded assessment uncertainties.24 Table A.1 – Typical parameters for tests with pulsed welding cu
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