SIST EN 50519:2010

SLOVENSKI STANDARD
SIST EN 50519:2010
01-maj-2010
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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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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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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 )
C
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:
F
E =
q
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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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 :
0
B
H=− M
µ
0
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
B
space: H = .
µ
0
[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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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
...