Basic standard for the evaluation of workers' exposure to electric and magnetic fields from equipment and installations for the production, transmission and distribution of electricity

This European Standard provides a general procedure to assess workers’ exposure to electric and magnetic fields (EMF) in work places associated with the production, transmission and distribution of electric energy, and to demonstrate compliance with exposure limit values and action levels as stated in the Council and European Parliament "EMF" Directive 2013/35/EU [12]. NOTE 1 The Council and European Parliament Directive 2013/35/EU will be transposed into national legislation in all the EU member countries. It is important that users of this standard consult the national legislation related to this transposition in order to identify the national regulations and requirements. These national regulations and requirements may have additional requirements that are not covered by this standard It has the role of a specific workplace standard. It takes into account the non-binding application guide for implementing the EMF Directive [11] and it defines the assessment procedures and compliance criteria applicable to the electric industry. The frequency range of this standard covers from DC to 20 kHz, which is sufficient to include the power frequency used for electric power supply systems throughout Europe (50 Hz) and the various harmonics and inter-harmonics occurring in the supply system. In this extremely low frequency range, electric and magnetic fields are independent and, therefore, they both have to be addressed in the exposure assessment. NOTE 2 Electrical companies also use radio frequency transmissions to operate and maintain their networks and power plants. Similarly, other exposures to EMF may occur during maintenance operations, for instance, due to the use of hand-held electrical tools. All these EMF sources are outside the scope of this standard. NOTE 3 Regarding EMF in the low frequency range, the scientific basis of the EMF directive is the ICNIRP health guidelines published in 2010 [14]. Reference is made to this scientific basis when necessary for justifying or clarifying some of the technical statements of the present document.

Basisnorm für die Evaluierung der beruflichen Exposition gegenüber elektrischen und magnetischen Feldern ausgehend von Komponenten und Anlagen zur Erzeugung, Übertragung und Verteilung elektrischer Energie

Norme fondamentale pour l'évaluation de l'exposition des travailleurs aux champs électriques et magnétiques produits par les équipements et installations de production, transport et distribution d'électricité

La présente Norme européenne fournit une procédure générale pour évaluer l’exposition des travailleurs aux champs électriques et magnétiques (EMF) sur les lieux de travail associés à la production, au transport et à la distribution de l’énergie électrique et démontrer la conformité aux valeurs limites d’exposition et aux valeurs déclenchant l’action indiquées dans la Directive 2013/35/UE « EMF » du Parlement européen et du Conseil [12]. NOTE 1 La Directive 2013/35/UE du Parlement européen et du Conseil sera transposée dans le droit national dans tous les pays membres de l’UE. Il est important que les utilisateurs de la présente norme consultent le droit national relatif à cette transposition afin d’identifier la règlementation nationale. Cette règlementation nationale peut comporter des exigences supplémentaires qui ne sont pas prévues par la présente norme. Elle joue le rôle de norme spécifique au lieu de travail. Elle tient compte du guide d’application non contraignant pour la mise en œuvre de la directive EMF [11] et définit les procédures d’évaluation et critères de conformité applicables à l’industrie de l’électricité. La plage de fréquences de la présente norme s’étend du continu à 20 kHz, ce qui est suffisant pour inclure la fréquence industrielle utilisée dans les réseaux d’énergie électrique européens (50 Hz) et les diverses harmoniques et interharmoniques présentes dans le réseau d’alimentation. Dans cette plage de très basses fréquences, les champs électriques et magnétiques sont indépendants et doivent par conséquent être pris tous les deux en compte dans l’évaluation de l’exposition. NOTE 2 Les entreprises d’électricité utilisent également des transmissions par radiofréquence pour gérer et entretenir leurs réseaux et centrales électriques. De la même façon, d’autres expositions aux champs électromagnétiques peuvent avoir lieu au cours des opérations de maintenance, par exemple du fait de l’utilisation d’outils électriques portatifs. Toutes ces sources de champs électromagnétiques ne relèvent pas du domaine d’application de la présente norme. NOTE 3 En ce qui concerne les champs électromagnétiques dans la plage de basses fréquences, les lignes directrices de l’ICNIRP sur la santé publiées en 2010 [14] constituent la base scientifique de la directive EMF. Une référence est faite à cette base scientifique lorsque cela s’avère nécessaire pour justifier ou préciser certains des points techniques du présent document.

Osnovni standard za ocenjevanje izpostavljenosti delavcev elektromagnetnim sevanjem, ki jih oddajajo oprema in inštalacije za proizvodnjo, prenos in razdeljevanje električne energije

Ta evropski standard določa splošni postopek za ocenjevanje izpostavljenosti delavcev elektromagnetnim sevanjem (EMF) na delovnih mestih, povezanih s proizvodnjo, prenosom in distribucijo električne energije, ter za dokazovanje skladnosti z mejnimi vrednostmi izpostavljenosti in ravnmi za ukrepanje, kot je navedeno v Direktivi evropskega sveta in parlamenta 2013/35/EU o elektromagnetnih sevanjih [10].
Ima vlogo posebnega standarda za delovna mesta. Upošteva neobvezujoča navodila za izvajanje direktive o elektromagnetnih sevanjih [9] ter določa postopke ocenjevanja in merila skladnosti, ki se uporabljajo v elektroindustriji.
Frekvenčno območje tega standarda obsega od enosmernega toka do 20 kHz, kar zadostuje za vključitev omrežne frekvence, ki se uporablja za električna omrežja v Evropi (50 Hz), in različnih harmonskih in medsebojno harmonskih nihanj, ki se pojavljajo v napajalnem sistemu. V tem izjemno nizkem frekvenčnem območju so elektromagnetna sevanja neodvisna in jih je zato treba obravnavati pri ocenjevanju izpostavljenosti.
OPOMBA 1: Podjetja za distribucijo električne energije upravljajo in vzdržujejo svoja omrežja in elektrarne tudi z radiofrekvenčnimi prenosi. Podobno lahko med vzdrževanjem pride do drugih izpostavljenosti elektromagnetnemu sevanju, na primer zaradi uporabe ročnih električnih orodij. Področje uporabe tega standarda ne zajema nobenega od teh virov elektromagnetnega sevanja.
OPOMBA 2: Pri elektromagnetnem sevanju v nizkem frekvenčnem območju so znanstvena podlaga za direktivo o elektromagnetnih sevanjih zdravstvene smernice ICNIRP, objavljene leta 2010 [12]. Ta znanstvena podlaga se omenja, ko je to potrebno za utemeljitev ali pojasnitev tehničnih izjav v tem dokumentu.

General Information

Status
Published
Publication Date
01-Jun-2017
Current Stage
6060 - Document made available
Due Date
02-Jun-2017
Completion Date
02-Jun-2017

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SLOVENSKI STANDARD
SIST EN 50647:2017
01-september-2017
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VHYDQMHPNLMLKRGGDMDMRRSUHPDLQLQãWDODFLMH]DSURL]YRGQMRSUHQRVLQ
UD]GHOMHYDQMHHOHNWULþQHHQHUJLMH

Basic standard for the evaluation of workers' exposure to electric and magnetic fields

from equipment and installations for the production, transmission and distribution of

electricity

Basisnorm für die Evaluierung der beruflichen Exposition gegenüber elektrischen und

magnetischen Feldern ausgehend von Komponenten und Anlagen zur Erzeugung,
Übertragung und Verteilung elektrischer Energie
Norme fondamentale pour l’évaluation de l’exposition des travailleurs aux champs

électriques et magnétiques produits par les équipements et installations de production,

transport et distribution d’électricité
Ta slovenski standard je istoveten z: EN 50647:2017
ICS:
13.100 Varnost pri delu. Industrijska Occupational safety.
higiena Industrial hygiene
17.220.01 Elektrika. Magnetizem. Electricity. Magnetism.
Splošni vidiki General aspects
SIST EN 50647:2017 en

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

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SIST EN 50647:2017
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SIST EN 50647:2017
EUROPEAN STANDARD EN 50647
NORME EUROPÉENNE
EUROPÄISCHE NORM
June 2017
ICS 17.220.20; 17.240
English Version
Basic standard for the evaluation of workers' exposure to electric
and magnetic fields from equipment and installations for the
production, transmission and distribution of electricity

Norme fondamentale pour l'évaluation de l'exposition des Basisnorm für die Evaluierung der beruflichen Exposition

travailleurs aux champs électriques et magnétiques produits gegenüber elektrischen und magnetischen Feldern

par les équipements et installations de production, transport ausgehend von Komponenten und Anlagen zur Erzeugung,

et distribution d'électricité Übertragung und Verteilung elektrischer Energie

This European Standard was approved by CENELEC on 2017-04-10. 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: Avenue Marnix 17, B-1000 Brussels

© 2017 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 50647:2017 E
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SIST EN 50647:2017
EN 50647:2017 (E)
Contents Page

European foreword ............................................................................................................................................ 4

3.1 Terms and definitions .......................................................................................................................... 6

3.2 Physical quantities and units .............................................................................................................. 8

3.3 Abbreviations ........................................................................................................................................ 8

6.1 General ................................................................................................................................................. 11

6.2 Exposure assessment regarding external fields ............................................................................. 11

6.2.1 General ................................................................................................................................................. 11

6.2.2 Harmonics of magnetic field.............................................................................................................. 12

6.2.3 Harmonics of electric field ................................................................................................................. 12

6.3 Numerical calculation of induced electric fields inside the human body ..................................... 13

8.1 General ................................................................................................................................................. 13

8.2 Simplified criteria for compliance with action levels ...................................................................... 15

8.2.1 General ................................................................................................................................................. 15

8.2.2 Magnetic fields .................................................................................................................................... 15

8.2.3 Electric fields ...................................................................................................................................... 16

8.3 Assessment using measurements or calculations ......................................................................... 17

8.3.1 General ................................................................................................................................................. 17

8.3.2 Magnetic fields .................................................................................................................................... 17

8.3.3 Electric fields ...................................................................................................................................... 18

9.1 General ................................................................................................................................................. 19

9.2 Simplified criteria for compliance with exposure limit values ....................................................... 19

9.2.1 General ................................................................................................................................................. 19

9.2.2 Magnetic fields .................................................................................................................................... 20

9.2.3 Electric fields ...................................................................................................................................... 21

9.3 Assessment using dosimetry and considerations for non-uniform fields ................................... 21

13.1 Workers at particular risk .................................................................................................................. 23

13.2 Other requirements ............................................................................................................................ 23

Annex A (informative) Assessment of harmonics in magnetic fields ....................................................... 24

A.1 Introduction ......................................................................................................................................... 24

A.2 Assessment Method using TEI ......................................................................................................... 24

A.3 Assessment using the weighted peak function .............................................................................. 26

A.4 Simplified assessment procedure for public grids ......................................................................... 28

Annex B (normative) 50 Hz magnetic field sources in the environment of equipment and installations

for production, transmission and distribution of electricity .......................................................... 29

B.1 General ................................................................................................................................................. 29

B.2 Currents in single conductors .......................................................................................................... 29

B.3 Currents in circuits ............................................................................................................................. 31

B.4 Assessing magnetic fields exposures ............................................................................................. 31

B.5 Check list for assessing compliance for magnetic fields .............................................................. 33

Annex C (informative) Examples of application of the different assessment criteria ............................. 34

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SIST EN 50647:2017
EN 50647:2017 (E)

C.1 Assessment for air-cored reactors: Simplified calculation of the magnetic field under a

vertical air-cored self-inductance ...................................................................................................... 34

C.2 Assessment for insulated cables: Calculation of compliance distances for typical XLPE

cables.................................................................................................................................................... 36

C.3 Assessment for exposure to electric fields considering different coupling conditions ............. 38

Annex D (informative) Method for deriving Exposure-Limit-Equivalent-Fields (LEFs) ........................... 41

D.1 Introduction .......................................................................................................................................... 41

D.2 Method .................................................................................................................................................. 41

D.3 Selection of the reference model: ...................................................................................................... 42

D.4 Reference organs and data ................................................................................................................ 42

D.5 Uncertainty assessment ..................................................................................................................... 43

D.6 Deriving the Exposure-Limit-Equivalent-Field (LEF) ....................................................................... 44

Annex E (informative) Considerations about DC magnetic fields in electrical companies ..................... 45

E.1 Introduction .......................................................................................................................................... 45

E.2 Exposure of workers to DC magnetic field in electrical companies .............................................. 45

E.3 Attention points ................................................................................................................................... 45

Annex F (informative) contact currents ........................................................................................................ 46

F.1 Introduction .......................................................................................................................................... 46

F.2 Influence of electric fields .................................................................................................................. 46

F.2.1 General ................................................................................................................................................. 46

F.2.2 Person isolated (at floating potential), capacitive coupling to ground ......................................... 46

F.2.3 Person at earth potential, isolated object ......................................................................................... 47

F.2.4 Spark discharges ................................................................................................................................. 48

F.3 Influence of magnetic fields ............................................................................................................... 48

F.3.1 General ................................................................................................................................................. 48

F.3.2 Working adjacent to live circuits ....................................................................................................... 48

F.4 Summary .............................................................................................................................................. 49

Annex G (informative) Exposure during transient and fault conditions ................................................... 50

G.1 Introduction .......................................................................................................................................... 50

G.2 Faults .................................................................................................................................................... 50

G.2.1 Overview ............................................................................................................................................... 50

G.2.2 Short-circuit currents during faults ................................................................................................... 50

G.2.3 Prevention and protection against faults.......................................................................................... 50

G.2.4 Magnetic field exposures during faults............................................................................................. 51

G.3 Switching transients ........................................................................................................................... 51

G.4 Lightning strikes .................................................................................................................................. 51

G.5 Inrush currents .................................................................................................................................... 51

G.6 Compliance of short-duration events with the Directive................................................................. 52

Bibliography ...................................................................................................................................................... 53

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SIST EN 50647:2017
EN 50647:2017 (E)
European foreword

This document [EN 50647:2017] has been prepared by CLC/TC 106X “Electromagnetic fields in the human

environment”.
The following dates are fixed:
• latest date by which this document has to be (dop) 2018-04-10
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) 2020-04-10
conflicting with this document have to
be withdrawn

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

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

This document has been prepared under a mandate given to CENELEC by the European Commission and

the European Free Trade Association.
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SIST EN 50647:2017
EN 50647:2017 (E)
1 Scope

This European Standard provides a general procedure to assess workers’ exposure to electric and magnetic

fields (EMF) in work places associated with the production, transmission and distribution of electric energy,

and to demonstrate compliance with exposure limit values and action levels as stated in the Council and

European Parliament “EMF” Directive 2013/35/EU [11].

NOTE 1 The Council and European Parliament Directive 2013/35/EU will be transposed into national legislation in all

the EU member countries. It is important that users of this standard consult the national legislation related to this

transposition in order to identify the national regulations and requirements. These national regulations and requirements

may have additional requirements that are not covered by this standard

It has the role of a specific workplace standard. It takes into account the non-binding application guide for

implementing the EMF Directive [10] and it defines the assessment procedures and compliance criteria

applicable to the electric industry.

The frequency range of this standard covers from DC to 20 kHz, which is sufficient to include the power

frequency used for electric power supply systems throughout Europe (50 Hz) and the various harmonics and

inter-harmonics occurring in the supply system. In this extremely low frequency range, electric and magnetic

fields are independent and, therefore, they both have to be addressed in the exposure assessment.

NOTE 2 Electrical companies also use radio frequency transmissions to operate and maintain their networks and

power plants. Similarly, other exposures to EMF may occur during maintenance operations, for instance, due to the use

of hand-held electrical tools. All these EMF sources are outside the scope of this standard.

NOTE 3 Regarding EMF in the low frequency range, the scientific basis of the EMF directive is the ICNIRP health

guidelines published in 2010 [13]. Reference is made to this scientific basis when necessary for justifying or clarifying

some of the technical statements of the present document.
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 61786-1, Measurement of DC magnetic, AC magnetic and AC electric fields from 1 Hz to 100 kHz with

regard to exposure of human beings - Part 1: Requirements for measuring instruments (IEC 61786-1)

EN 50527-1, Procedure for the assessment of the exposure to electromagnetic fields of workers bearing

active implantable medical devices - Part 1: General

EN 50527-2-1, Procedure for the assessment of the exposure to electromagnetic fields of workers bearing

active implantable medical devices - Part 2-1: Specific assessment for workers with cardiac pacemakers

IEC 61786-2, Measurement of DC magnetic, AC magnetic and AC electric fields from 1 Hz to 100 kHz with

regard to exposure of human beings - Part 2: Basic standard for measurements
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SIST EN 50647:2017
EN 50647:2017 (E)
3 Terms, definitions, physical quantities, units and abbreviations
3.1 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1.1
action level

operational level established for the purpose of simplifying the process of demonstrating compliance with the

relevant exposure limit value or, where appropriate, to take relevant protection or prevention measures

Note 1 to entry: “Reference levels” as defined in the European Recommendation 1999/519/EC [3] for limiting the

exposure of the public and in ICNIRP Health Guidelines [13] are based on the same approach as Action Levels and the

two terms are defined to achieve the same objective.

Note 2 to entry: For electric fields, “Low ALs” and “High ALs” are levels which relate to the specific protection or

prevention measures specified in the EMF Directive [11].

Note 3 to entry: The Low AL for external electric field is based both on limiting the internal electric field below ELVs and

on limiting spark discharges in the working environment. Below the High AL, the internal electric field does not exceed

ELVs and annoying spark discharges are prevented, provided that the relevant protection measures are taken.

Note 4 to entry: For magnetic fields, “Low ALs” are levels which relate to the sensory effects ELVs and “High ALs” to

the health effects ELVs.

Note 5 to entry: Compliance with the ALs will ensure compliance with the relevant ELVs. If the assessed exposure

values are higher than the ALs, it does not necessarily follow that the ELVs have been exceeded, but a more detailed

analysis is necessary to demonstrate compliance with the ELVs.

Note 6 to entry: ALs may not provide adequate protection to workers at particular risks, for whom a particular risk

assessment shall be performed.
3.1.2
compliance distance

distance from a source of field that ensures respect of the relevant exposure limit values or action levels

Note 1 to entry: Working at distances smaller than compliance distances requires a specific assessment.

3.1.3
contact current

current between a person in established contact with a conductive object, resulting from the inductive or

capacitive coupling between the field and the person and/or object, and expressed in amperes (A)

Note 1 to entry: The EMF directive [11] specifies limits for the steady-state value of the contact current.

3.1.4
electric field

constituent of an electromagnetic field which is characterized by the electric field strength E together with the

electric flux density D

Note 1 to entry: In French, the term “champ électrique ” is also used for the quantity electric field strength.

[SOURCE: IEV, ref 121-11-67]
3.1.5
exposure index
assessed exposure divided by the relevant action level or exposure limit value
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SIST EN 50647:2017
EN 50647:2017 (E)
3.1.6
exposure-limit-equivalent field
LEF

magnitude of uniform external electric or magnetic field that exposes the person to the sensory or health

effects ELV
Note 1 to entry: The numerical values of LEFs are derived from dosimetry.
3.1.7
exposure limit value
ELV

limit which is based directly on established health effects and biological considerations

Note 1 to entry: In the frequency range covered by the present standard, ELVs are expressed in terms of induced

electric fields except between 0 Hz and 1 Hz where the ELV is given in terms of external magnetic field.

Note 2 to entry: “Basic restrictions” as defined in the European Recommendation 1999/519/EC [3] for limiting the

exposure of the public and in ICNIRP Health Guidelines [13] are based on the same approach as Exposure Limit Values

and the two terms are defined to achieve the same objective.
3.1.8
exposure limit values for sensory effects (sensory effects ELVs)

ELVs above which workers might be subject to transiently disturbed sensory perceptions, i.e. retinal

phosphenes and minor changes in brain functions

Note 1 to entry: The sensory effects relate only to the central nervous system of the head. Exceeding sensory effects

ELVs is allowed under controlled conditions for informed workers.
3.1.9
exposure limit values for health effects (health effects ELVs)

ELVs above which workers might be might be subject to adverse health effects, such as stimulation of nerve

and muscle tissue

Note 1 to entry: Compliance with health effects ELVs will ensure that workers exposed to electric and magnetic fields

are protected against all established adverse health effects.

Note 2 to entry: The threshold for muscle excitation is far higher than for nerve excitation, and therefore the directive

[11], consistently with its scientific basis [13], considers limits to prevent only nerve excitation, as they are conservative

with regard to muscle excitation. As a result, the health effects relate to the peripheral nervous system, i.e. the whole

body.
3.1.10
induced electric field

electric field inside a human body resulting directly from an exposure to an external source of electric or

magnetic field
3.1.11
magnetic field

constituent of an electromagnetic field which is characterized by the magnetic field strength H together with

the magnetic flux density B

Note 1 to entry: In French, the term “champ magnétique” is also used for the quantity magnetic field strength.

Note 2 to entry: In this document, the term magnetic field is used for magnetic flux density.

[SOURCE: IEV ref 121-11-69]
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SIST EN 50647:2017
EN 50647:2017 (E)
3.1.12
total exposure index
TEI

sum of all exposure indexes (e.g. at different frequencies, or from different sources) of either electric or

magnetic field

Note 1 to entry: If the total exposure index is less than one, the exposure is compliant.

Note 2 to entry: Using the arithmetic sum makes the TEI a conservative assessment of exposure.

3.1.13
unperturbed field

field at a point that would exist in the absence of persons or in the absence of movable objects which are not

necessary for the work progress

Note 1 to entry: All limits expressed in terms of fields external to the human body refer to the unperturbed field.

[SOURCE: EN 61786-1:2014, 3.3.1]
3.2 Physical quantities and units

For the purposes of this document, the physical quantities and units given in Table 1 apply.

Table 1 — Physical quantities and units
Quantity Symbol Unit Comments
Electric field strength E V/m
Magnetic flux density B T µT is more usually used at 50 Hz
Contact current I A
3.3 Abbreviations
AL action level
CNS central nervous system
DC direct current
EI exposure index
ELV exposure limit value
GIS gas insulated substation
HV high voltage
LEF exposure limit equivalent field
PNS peripheral nervous system
TEI total exposure index
WPR worker at particular risk
rms root mean square
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SIST EN 50647:2017
EN 50647:2017 (E)
4 Assessment procedure

According to Article 4 of EU Directive 2013/35/EU [11] “...the employer shall assess all risks for workers

arising from electromagnetic fields at the workplace and, if necessary, measure or calculate the levels of

electromagnetic fields to which workers are exposed......In workplaces open to the public it is not necessary

for the exposure assessment to be carried out if an evaluation has already been undertaken in accordance

with the provisions on the limitation of exposure of the general public to electromagnetic fields, if the

restrictions specified in those provisions are respected for workers and if the health and safety risks are

excluded. Where equipment intended for the public use is used as intended and complies with Union law on

products that establishes stricter safety levels than those provided for by this Directive, and no other

equipment is used, these conditions are deemed to be met.”

Electrical equipment for the production, transmission and distribution of electricity is highly standardized and

a few general assessments may cover many sites which have similar equipment and work positions.

Therefore, a systematic and thorough assessment of every site containing electrical equipment is not

necessary. For a given site, the risk assessment should be limited to any specific equipment or work

positions not covered by the general assessments.

The exposure assessment shall be updated if any modification to the installation, the working environment or

the work practice significantly affects the EMF exposure conditions.

In electrical companies, many workplaces are exposed simultaneously to electric and magnetic fields. The

internal electric fields induced simultaneously by external electric and magnetic fields are vectors, which

most often are neither collinear in space nor coincident in phase. ICNIRP’s position [13] is that situations

where these field vectors are collinear and in phase “are judged to be very infrequent taking into account the

great difference in the distribution of the electrically and magnetically induced electric fields“.

Therefore, when assessing compliance with the Directive according to the present standard, exposure to low

frequency electric and magnetic fields shall be considered separately and not additively.

This clause gives a general procedure for the exposure assessment of a work place, which is presented in

Figure 1 as a flowchart. It shows all the possible methods to demonstrate compliance with the EMF directive

[11]. The different steps of this flowchart are developed in Clauses 5, 7, 8, 9, 10 and 13.

Compliance can be demonstrated using any of the possible methods. For example, in some cases it might

be more simple and efficient to demonstrate compliance using measurements (e.g. subclause 8.3) rather

than identifying all the electrical equipment and checking whether it meets the criteria for simplified

assessment (e.g. subclause 8.2).
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SIST EN 50647:2017
EN 50647:2017 (E)
Figure 1 — General flowchart of the compliance assessment procedure
5 Collection of technical data

For assessing compliance, it is necessary to characterize the workplace in terms of EMF sources and of

work positions in relation to them, and of the work practices involved. In terms of t

...

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