Assessment of workers' exposure to electric and magnetic fields of industrial induction heating equipment

This European Standard specifies procedures for assessment of electric, magnetic and electromagnetic fields produced by industrial and professional induction heating equipment.

Beurteilung der Exposition von Arbeitnehmern gegenüber elektrischen und magnetischen Feldern von industriellen induktiven Elektrowärmeanlagen

Evaluation de l'exposition des travailleurs aux champs électriques et magnétiques produits par les équipements industriels de chauffage par induction

Ocena izpostavljenosti delavcev električnim in magnetnim poljem opreme za industrijsko indukcijsko gretje

Ta evropski standard določa postopke za oceno električnih, magnetnih in elektromagnetnih polj, ki jih proizvaja oprema za industrijsko in profesionalno indukcijsko gretje.

General Information

Status
Withdrawn
Public Enquiry End Date
31-Jul-2008
Publication Date
11-Apr-2010
Withdrawal Date
26-Nov-2017
Current Stage
9900 - Withdrawal (Adopted Project)
Start Date
12-Oct-2017
Due Date
04-Nov-2017
Completion Date
27-Nov-2017

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SLOVENSKI STANDARD
SIST EN 50519:2010
01-maj-2010
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LQGXVWULMVNRLQGXNFLMVNRJUHWMH

Assessment of workers' exposure to electric and magnetic fields of industrial induction

heating equipment
Beurteilung der Exposition von Arbeitnehmern gegenüber elektrischen und
magnetischen Feldern von industriellen induktiven Elektrowärmeanlagen

Evaluation de l'exposition des travailleurs aux champs électriques et magnétiques

produits par les équipements industriels de chauffage par induction
Ta slovenski standard je istoveten z: EN 50519:2010
ICS:
13.280 Varstvo pred sevanjem Radiation protection
25.180.10 (OHNWULþQHSHþL Electric furnaces
SIST EN 50519:2010 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 50519:2010
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SIST EN 50519:2010
EUROPEAN STANDARD
EN 50519
NORME EUROPÉENNE
March 2010
EUROPÄISCHE NORM
ICS 13.280; 25.180.10
English version
Assessment of workers' exposure to electric and magnetic fields
of industrial induction heating equipment
Evaluation de l'exposition des travailleurs Beurteilung der Exposition
aux champs électriques et magnétiques von Arbeitnehmern gegenüber
produits par les équipements industriels elektrischen und magnetischen Feldern
de chauffage par induction von industriellen induktiven
Elektrowärmeanlagen

This European Standard was approved by CENELEC on 2010-02-01. 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, Croatia, 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.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: Avenue Marnix 17, B - 1000 Brussels

© 2010 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 50519:2010 E
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SIST EN 50519:2010
EN 50519:2010 - 2 -
Foreword

This European Standard was prepared by WG 9 WP 1 “Induction Heaters” of the Technical Committee

CENELEC TC 106X, Electromagnetic fields in the human environment.

The text of the draft was submitted to the formal vote in February 2009. On the basis of the established

voting results, CLC/TC 106X decided to prepare an amendment for inclusion in the standard to make it

fully protective for doing workers exposure assessments in all eventualities.

The text of the draft amendment (FprAA) was submitted to the Unique Acceptance Procedure and the

combined text was approved by CENELEC as EN 50519 on 2010-02-01.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent

rights.
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) 2011-02-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2013-02-01

This European Standard has been prepared under Mandate M/351 given to CENELEC by the European

Commission and the European Free Trade Association and covers essential requirements of

EC Directive 2004/40/EC.
___________
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SIST EN 50519:2010
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Contents

1 Scope ................................................................................................................................................. 4

2 Normative references ....................................................................................................................... 4

3 Terms and definitions ...................................................................................................................... 5

4 General considerations ................................................................................................................... 7

5 Classification of induction heating equipment ............................................................................. 8

6 Assessment procedure .................................................................................................................... 8

7 Measurement .................................................................................................................................... 9

7.1 Preparation of the measuring action ...................................................................................... 9

7.2 Initial field topology scan ......................................................................................................10

7.3 Final measurement ...............................................................................................................10

8 Documentation ...............................................................................................................................11

Annex A (informative) Particular induction heating applications and worst case operating

conditions..............................................................................................................................................13

Annex B (informative) Examples of magnetic field-measurements ...............................................14

B.1 Example for the assessment of the magnetic-field of a horizontal source ...........................14

B.2 Example for a documentation of the measurement results ..................................................16

Bibliography ..........................................................................................................................................17

Figures

Figure 1 - Principle layout of an induction heating installation .................................................................7

Figure B.1 - Example of system of co-ordinates x, y, h in a layout drawing of an induction heating

equipment for the assessment of the magnetic-field of a horizontal source ........................................ 14

Figure B.2 - Example for the documentation of the measurement results ............................................ 16

Tables

Table A.1 - List of particular induction heating applications (as listed in Clause 1) indicating

specific features with the view to particular characteristics to be considered for the measuring

procedure............................................................................................................................................... 13

Table B.1 - Example of a working table to introduce the co-ordinates of the measuring points

relating to example Figure B.1 .............................................................................................................. 15

Table B.2 - Example of a form for the report of the measuring procedure ............................................ 15

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EN 50519:2010 - 4 -
1 Scope

This European Standard specifies procedures for assessment of electric, magnetic and

electromagnetic fields produced by industrial and professional induction heating equipment.

NOTE This European Standard does not apply to household appliances.
Typical induction heating applications are for example:
- melting;
- zone-melting;
- heating before hot forming;
- heating by tunnel-inductor;
- hardening / coaxial transformer handheld devices;
- tube welding;
- tube annealing;
- hardening;
- soldering;
- hard-soldering /brazing;
- bonding;
- annealing;
- metal-strip and wire heating;
- tempering;
- sintering;
- shrinking.

This product standard covers the frequency range up to 30 MHz taking into account the specific

characteristics of industrial and professional induction heating equipment and its usage.

This European Standard may also be used for assessment regarding the requirements of

Directive 2004/40/EC [1] on the minimum health and safety requirements regarding the exposure of

workers to the risks arising from physical agents (electromagnetic fields), provided that no other relevant

field sources are present in close proximity. If other field sources are present, additional assessment

according to EN 50499:2008 is necessary.

This European Standard does not cover protective measures for people with active implants.

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 50413:2008, Basic standard on measurement and calculation procedures for human exposure to

electric, magnetic and electromagnetic fields (0 Hz – 300 GHz)

EN 50499:2008, Procedure for the assessment of the exposure of workers to electromagnetic fields

EN 12198-1, Safety of machinery - Assessment and reduction of risks arising from radiation emitted by

machinery - Part 1: General principles

IEC 60050-841:2004, International Electrotechnical Vocabulary - Part 841: Industrial electroheat

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3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
SI-units are used throughout the standard.
3.1
action values

the magnitude of directly measurable parameters, provided in terms of electric field strength (E), magnetic

field strength (H), magnetic flux density (B) and power density (S), at which one or more of the specified

measures in Directive 2004/40/EC must be undertaken. Compliance with these values will ensure

compliance with the relevant exposure limit values (from 2004/40/EC)
[EN 50413:2008, 3.1]
3.2
contact current (I )

current flowing into the body resulting from contact with a conductive object in an electromagnetic field.

This is the localised current flow into the body (usually the hand, for a light brushing contact), expressed

in Ampere (A)
[EN 50413:2008, 3.4]
3.3
electric field strength (E)

vector quantity obtained at a given point that represents the force (F) on an infinitely small charge (q)

divided by the charge:
E =
electric field strength is expressed in volt per metre (V/m)
[EN 50413:2008, 3.7]
3.4
employer

any natural or legal person who has an employment relationship with the worker and has responsibility for

the undertaking and/or establishment (from 89/391/EEC)
[EN 50499:2008, 3.2]
3.5
exposure

for the purpose of this standard exposure occurs whenever and wherever a worker is subjected to

magnetic fields from industrial induction heating equipment
3.6
exposure limit values

limits of exposure to electromagnetic fields, which are based directly on established health effects and

biological considerations. Compliance with these limits will ensure that workers exposed to

electromagnetic fields are protected against all known adverse health effects (from 2004/40/EC)

[EN 50413:2008, 3.9]
3.7
induced current (I)

current induced inside the body as a result of direct exposure to electromagnetic fields, expressed in

Ampere (A)
[EN 50413:2008, 3.13]
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EN 50519:2010 - 6 -
3.8
inductor

a heating inductor for creating the magnetic field, which induces currents in a metal charge or in a

crucible of conductive materials
[IEV 841-27-48:2004, mod.]
3.9
iso-field-line

line with constant values of a recorded field (e.g. magnetic field strength H or magnetic flux

density B)
3.10
magnetic field strength (H)

vector quantity obtained at a given point by subtracting the magnetization M from the magnetic flux

density B divided by the permeability of free space µ :
H=− M
Magnetic field strength is expressed in Ampere per meter (A/m)

NOTE In vacuum, the magnetic field strength is at all points equal to the magnetic flux density divided by the permeability of free

space: H = .
[EN 50413:2008, 3.16]
3.11
magnetic flux density (B)

the field vector in a point that results in a force (F) on a charge (q) moving with the velocity (v):

F = q (v × B)
The magnitude of the magnetic flux density is expressed in Tesla (T)
[EN 50413:2008, 3.15]
3.12
measuring distance

distance between a reference surface of the appliance and the geometrical centre of the field probe

3.13
modulation

process of modifying the amplitude, phase and/or frequency of a periodic waveform in order to convey

information
[EN 50413:2008, 3.17]
3.14
peak value

the peak value of the electric or magnetic field strength or magnetic flux density represents the maximum

magnitude of the field vector. It is composed of three individual components of the electric or magnetic

field strength or magnetic flux density, which are instantaneous values in three mutually orthogonal

directions
22 2 
V=+max V(tV)(tV)(+ t)
P xy z
 
 
[EN 50413:2008, 3.19]
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3.15
probe

input device of a measuring instrument, generally made as a separate unit, which transforms the

measured input value to a suitable output value
[EN 50413:2008, 3.24]
3.16
worker

any person employed by an employer, including trainees and apprentices but excluding domestic

servants (from 89/391/EEC)

NOTE This definition may be subject to national adaptation which then takes precedence.

[EN 50499:2008, 3.9]
3.17
work place
location where workers have access as part of their duties
[EN 50499:2008, 3.8]
3.18
worst case operating conditions
operating conditions of the equipment, where the maximum exposure occurs

(See also Annex A, list of relevant items for particular equipment with reference to the list of typical

application in Clause 1).
4 General considerations

The principle layout of an induction heating installation consisting of power source and load is shown in

Figure 1 as a parallel compensated circuit. Serial compensated circuits are used as well. The load is a

resonance circuit comprising a compensating capacitor bank, high current conductors and an inductor

or an inductor coil including matching transformer, if applicable.
Load
Power Source
High Current
Conductors Compensation Inductor
Conductors
Figure 1 – Principle layout of an induction heating installation

Inductor and high current carrying conductors are the main sources of magnetic fields.

Contact currents generated by electromagnetic fields and electric fields from induction heating

installations with frequencies below 1 MHz are usually below the action values. Therefore they are not

taken into account in the context of this standard.
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EN 50519:2010 - 8 -

Contact currents from shielded, and some unshielded, induction heating installations at frequencies of

1 MHz or above can approach the action values and they may need to be measured. If so, this should

be done in accordance with EN 50413.

Electric fields from some unshielded induction heating installations at frequencies of 1 MHz or above

can approach the action values and they may need to be measured. If so, this should be done in

accordance with EN 50413.
5 Classification of induction heating equipment
Induction heating equipment can be divided in three groups:

(1) equipment using inductors with cylindrical coil/s operating in horizontal position;

(2) equipment using inductors with cylindrical coil/s operating in vertical position;

(3) equipment not belonging to groups (1) and (2).

In general groups (1) and (2) contain high power equipment, e.g. for melting, sintering, heating of billets

before hot forming. Their field distribution is approximately rotationally symmetrical. However, the field

distribution may be influenced by metallic construction elements (e.g. yokes, frames and cages).

Group (3) contains equipment with non-cylindrical inductors, which may have complex geometries and

are used e.g. for ha
...

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