Assessment of electric welding equipment related to resctrictions of human exposure to electromagnetic fields (0Hz . 300 GHz) - Part 2: Basic standard for arc welding equipment (IEC 62822-2:2016)

This part of IEC 62822 applies to equipment for arc welding and allied processes designed for
occupational use by professionals and for use by laymen.
NOTE 1 Typical allied processes are electric arc cutting and arc spraying.
This standard specifies procedures for the assessment of human exposure to magnetic fields
produced by arc welding. It covers non-thermal biological effects in the frequency range from
0 Hz to 10 MHz and defines standardized test scenarios.
NOTE 2 The general term “field” is used throughout this document for “magnetic field”.
NOTE 3 For the assessment of exposure to electric fields and thermal effects, the methods specified in the
Generic Standard IEC 62311 apply.
This standard does not define methods for workplace assessment regarding the risks arising
from electromagnetic fields (EMF). However, the EMF data that results from the application of
this standard can be used to assist in workplace assessment.
Other standards may apply to products covered by this standard. In particular this standard
cannot be used to demonstrate electromagnetic compatibility with other equipment. It does
not specify any product safety requirements other than those specifically related to human
exposure to electromagnetic fields.

Elektrische Schweißeinrichtungen - Bewertung in Bezug auf Begrenzungen der Exposition von Personen gegenüber elektromagnetischen Feldern (0 Hz bis 300 GHz) - Teil 2: Lichtbogenschweißeinrichtungen

Matériels de soudage électrique - Évaluation des restrictions relatives à l'exposition humaine aux champs électromagnétiques (0 Hz à 300 GHz) - Partie 2: Matériels de soudage à l’arc

L'IEC 62822-2:2016 s'applique aux matériels de soudage à l'arc et techniques connexes conçus pour un usage professionnel et non professionnel.

Ocena električne varilske opreme glede na omejitve izpostavljenosti delavcev elektromagnetnim poljem (0Hz . 300 GHz) - 2. del: Osnovni standard za obločno varjenje (IEC 62822-2:2016)

Ta del standarda IEC 62822 se uporablja za opremo za obločno varjenje in sorodne postopke, zasnovano za uporabo pri delu strokovnjakov in laikov.
OPOMBA 1: Tipični sorodni postopki so električno obločno rezanje in brizganje.
Ta standard določa postopke za oceno izpostavljenosti delavcev magnetnim poljem, ki ustvarijo pri obločnem varjenju. Obravnava atermične biološke vplive v frekvenčnem razponu od 0 HZ do 10 MHz in določa standardizirane preskusne scenarije.
OPOMBA 2: Splošni izraz »polje« se v tem dokumentu uporablja za »magnetno polje«.
OPOMBA 3: Za oceno izpostavljenosti električnim poljem in toplotnim vplivom se uporabljajo metode, podane v splošnem standardu IEC 62311.
Ta standard ne določa metod za oceno delovnega mesta v povezavi s tveganji zaradi elektromagnetnih polj (EMF). Vendar podatki o elektromagnetnih poljih, ki se pridobijo na podlagi uporabe tega standarda, se lahko uporabijo kot pomoč pri ocenjevanju delovnega mesta.
Za proizvode, ki jih obravnava ta standard, se lahko uporabljajo drugi standardi. Ta standard se ne uporablja za dokazovanje elektromagnetne združljivosti z drugo opremo. Ne določa nobenih varnostnih zahtev za proizvode, razen tistih, ki se posebej navezujejo na izpostavljenost delavcev elektromagnetnim poljem.

General Information

Status
Published
Publication Date
27-Sep-2016
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
21-Sep-2016
Due Date
26-Nov-2016
Completion Date
28-Sep-2016

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SLOVENSKI STANDARD
SIST EN 62822-2:2016
01-november-2016
2FHQDHOHNWULþQHYDULOVNHRSUHPHJOHGHQDRPHMLWYHL]SRVWDYOMHQRVWLGHODYFHY
HOHNWURPDJQHWQLPSROMHP +]*+] GHO2VQRYQLVWDQGDUG]DREORþQR
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Assessment of electric welding equipment related to resctrictions of human exposure to

electromagnetic fields (0Hz . 300 GHz) - Part 2: Basic standard for arc welding
equipment (IEC 62822-2:2016)
Ta slovenski standard je istoveten z: EN 62822-2:2016
ICS:
13.280 Varstvo pred sevanjem Radiation protection
25.160.30 Varilna oprema Welding equipment
SIST EN 62822-2:2016 en

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

---------------------- Page: 1 ----------------------
SIST EN 62822-2:2016
---------------------- Page: 2 ----------------------
SIST EN 62822-2:2016
EUROPEAN STANDARD EN 62822-2
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2016
ICS 25.160; 25.160.30
English Version
Electric welding equipment - Assessment of restrictions related
to human exposure to electromagnetic fields (0 Hz to 300 GHz) -
Part 2: Arc welding equipment
(IEC 62822-2:2016)

Matériels de soudage électrique - Évaluation des Bewertung Elektrischer Schweisseinrichtungen in Bezug

restrictions relatives à l'exposition humaine aux champs auf Begrenzungen der Exposition von Personen gegenüber

électromagnétiques (0 Hz à 300 GHz) - Elektromagnetischen Feldern (0 Hz - 300 GHz) -

Partie 2: Matériels de soudage à l'arc Teil 2: Grundnorm für Lichtbogenschweißeinrichtungen

(IEC 62822-2:2016) (IEC 62822-2:2016)

This European Standard was approved by CENELEC on 2016-05-04. 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, 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

© 2016 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.

Ref. No. EN 62822-2:2016 E
---------------------- Page: 3 ----------------------
SIST EN 62822-2:2016
EN 62822-2:2016
European foreword

The text of document 26/584/FDIS, future edition 1 of IEC 62822-2, prepared by IEC/TC 26 "Electric

welding" was submitted to the IEC-CENELEC parallel vote and approved by CENELEC as

EN 62822-2:2016.
The following dates are fixed:
(dop) 2017-03-16
• latest date by which the document has to be
implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2019-09-16
standards conflicting with the
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 [and/or CEN] shall not be held responsible for identifying any or all such

patent rights.
Endorsement notice

The text of the International Standard IEC 62822-2:2016 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following notes have to be added for the standards indicated:

IEC 62226-1 NOTE Harmonized as EN 62226-1.
IEC 62226-2-1:2004 NOTE Harmonized as EN 62226-2-1:2005 (not modified).
IEC 62311 NOTE Harmonized as EN 62311.
---------------------- Page: 4 ----------------------
SIST EN 62822-2:2016
EN 62822-2:2016
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications

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.

NOTE 1 When an International Publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.

NOTE 2 Up-to-date information on the latest versions of the European Standards listed in this annex is available here:

www.cenelec.eu
Publication Year Title EN/HD Year
IEC 60050-851 2008 International Electrotechnical Vocabulary - - -
Part 851: Electric welding
IEC 60974-1 - Arc welding equipment - EN 60974-1 -
Part 1: Welding power sources
IEC 60974-6 - Arc welding equipment - EN 60974-6 -
Part 6: Limited duty equipment
IEC 61786-1 - Measurement of DC magnetic, AC EN 61786-1 -
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 61786-2 - Measurement of DC magnetic, AC EN 61788-2 -
magnetic and AC electric fields from 1 Hz
to 100 kHz with regard to exposure of
human beings -
Part 2: Basic standard for measurements
IEC 62822-1 - Electric welding equipment - Assessment EN 62822-1 -
of restrictions related to human exposure
to electromagnetic fields (0 Hz to 300 GHz)
- Part 1: Product family standard
---------------------- Page: 5 ----------------------
SIST EN 62822-2:2016
---------------------- Page: 6 ----------------------
SIST EN 62822-2:2016
IEC 62822-2
Edition 1.0 2016-03
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Electric welding equipment – Assessment of restrictions related to human
exposure to electromagnetic fields (0 Hz to 300 GHz) –
Part 2: Arc welding equipment
Matériels de soudage électrique – Évaluation des restrictions relatives à
l'exposition humaine aux champs électromagnétiques (0 Hz à 300 GHz) –
Partie 2: Matériels de soudage à l’arc
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 25.160; 25.160.30 ISBN 978-2-8322-3271-2

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 62822-2:2016
– 2 – IEC 62822-2:2016 © IEC 2016
CONTENTS

FOREWORD ......................................................................................................................... 4

1 Scope ............................................................................................................................ 6

2 Normative references..................................................................................................... 6

3 Terms, definitions and abbreviations .............................................................................. 7

3.1 Terms and definitions ............................................................................................ 7

3.2 Quantities and units .............................................................................................. 8

3.3 Constants ............................................................................................................. 8

4 Requirements ................................................................................................................ 8

5 Assessment methods ..................................................................................................... 8

5.1 General considerations .......................................................................................... 8

5.1.1 Time averaging .............................................................................................. 8

5.1.2 Spatial averaging of external field values ........................................................ 8

5.1.3 Spatial averaging of intracorporeal values ...................................................... 9

5.1.4 Equipment with pulsed or non-sinusoidal welding current ................................ 9

5.1.5 Considerations for spectral analysis ............................................................. 12

5.1.6 Uncertainty of assessment ........................................................................... 13

5.2 Measurement of external field levels .................................................................... 14

5.2.1 General ....................................................................................................... 14

5.2.2 Measurement equipment .............................................................................. 14

5.3 Calculation of external field levels ....................................................................... 14

5.3.1 General ....................................................................................................... 14

5.3.2 Source model and calculation equation ......................................................... 14

5.4 Calculation of intracorporeal levels ...................................................................... 15

5.4.1 General ....................................................................................................... 15

5.4.2 Source model ............................................................................................... 15

5.4.3 Body model for analytical calculations .......................................................... 15

5.4.4 Anatomical body models for numerical calculations ....................................... 17

6 Assessment conditions ................................................................................................ 18

6.1 Assessment configurations .................................................................................. 18

6.1.1 General ....................................................................................................... 18

6.1.2 Exposure of the head ................................................................................... 18

6.1.3 Exposure of the trunk ................................................................................... 21

6.1.4 Exposure of limbs ........................................................................................ 24

6.2 Welding current conditions .................................................................................. 26

6.2.1 General ....................................................................................................... 26

6.2.2 Single operating mode ................................................................................. 27

6.2.3 Multiple operating modes ............................................................................. 28

6.2.4 Worst case power source capability .............................................................. 28

6.2.5 Current ripple ............................................................................................... 28

7 EMF data sheet and assessment report ........................................................................ 28

Annex A (informative) Example for EMF data sheet structure .............................................. 30

Annex B (informative) Assessment example for maximum power-source capability .............. 31

B.1 Equipment description ......................................................................................... 31

B.2 Welding current measurement and spectral analysis ............................................ 31

B.3 Assessment of non-thermal effects ...................................................................... 32

Annex C (informative) Summation with approximated and piecewise linear limit values ....... 36

---------------------- Page: 8 ----------------------
SIST EN 62822-2:2016
IEC 62822-2:2016 © IEC 2016 – 3 –

Annex D (informative) Coupling factors for various distances and disk radii ......................... 37

Bibliography ....................................................................................................................... 38

Figure 1 – Piecewise linear and approximated limit amplitudes ............................................ 11

Figure 2 – Piecewise linear and approximated summation function phase angles ................. 11

Figure 3 – Spectral synthesis for the validation of the analysis ............................................. 12

Figure 4 – Equivalent waveform for non-repetitive signals .................................................... 13

Figure 5 – Conducting disk in a uniform magnetic flux density .............................................. 15

Figure 6 – Electrical conductivity for homogeneous body models ......................................... 16

Figure 7 – Field measurement at head position .................................................................... 19

Figure 8 – Field calculation at head position ........................................................................ 19

Figure 9 – Analytical calculation of intracorporeal metrics for the head ................................. 20

Figure 10 – Numerical calculation of intracorporeal metrics for the head .............................. 21

Figure 11 – Field measurement at trunk position .................................................................. 21

Figure 12 – Field calculation at trunk position ...................................................................... 22

Figure 13 – Analytical calculation of intracorporeal metrics for the trunk ............................... 22

Figure 14 – Numerical calculation of intracorporeal metrics for the trunk .............................. 23

Figure 15 – Field measurement at limb positions, hand and thigh ......................................... 24

Figure 16 – Field calculation at limb positions, hand and thigh ............................................. 24

Figure 17 – Analytical calculation of intracorporeal metrics for hand and thigh ..................... 25

Figure 18 – Numerical calculation of intracorporeal metrics for hand and thigh ..................... 26

Figure B.1 – Example 1 – Current ripple .............................................................................. 31

Figure B.2 – Example 1 – Maximum power-source capability ............................................... 32

Figure B.3 – Example 1 – EI calculation element ................................................................. 33

Figure B.4 – Example 1 – EI calculation summary ............................................................... 34

Figure B.5 – Example 1 – EMF data sheet ........................................................................... 35

Figure C.1 – EI comparison with approximated and piecewise linear values ......................... 36

Table 1 – Phase angles of weighting function or summation function ...................................... 9

Table 2 – Radii and coupling factors for 2D disk models ...................................................... 16

Table D.1 – Coupling factors for various distances and disk radii ......................................... 37

---------------------- Page: 9 ----------------------
SIST EN 62822-2:2016
– 4 – IEC 62822-2:2016 © IEC 2016
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ELECTRIC WELDING EQUIPMENT – ASSESSMENT OF
RESTRICTIONS RELATED TO HUMAN EXPOSURE TO
ELECTROMAGNETIC FIELDS (0 Hz to 300 GHz) –
Part 2: Arc welding equipment
FOREWORD

1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising

all national electrotechnical committees (IEC National Committees). The object of IEC is to promote

international co-operation on all questions concerning standardization in the electrical and electronic fields. To

this end and in addition to other activities, IEC publishes International Standards, Technical Specifications,

Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to as “IEC

Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee interested

in the subject dealt with may participate in this preparatory work. International, governmental and non-

governmental organizations liaising with the IEC also participate in this preparation. IEC collaborates closely

with the International Organization for Standardization (ISO) in accordance with conditions determined by

agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence

between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in

the latter.

5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity

assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is

indispensable for the correct application of this publication.

9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of

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

International Standard IEC 62822-2 has been prepared by IEC technical committee 26:

Electric welding.
The text of this standard is based on the following documents:
FDIS Report on voting
26/584/FDIS 26/591/RVD

Full information on the voting for the approval of this standard can be found in the report on

voting indicated in the above table.

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

---------------------- Page: 10 ----------------------
SIST EN 62822-2:2016
IEC 62822-2:2016 © IEC 2016 – 5 –

A list of all parts in the IEC 62822 series, published under the general title Electric welding

equipment – Assessment of restrictions related to human exposure to electromagnetic fields

(0 Hz to 300 GHz), can be found on the IEC website.

The committee has decided that the contents of this publication will remain unchanged until

the stability date indicated on the IEC website under "http://webstore.iec.ch" in the data

related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates

that it contains colours which are considered to be useful for the correct

understanding of its contents. Users should therefore print this document using a

colour printer.
---------------------- Page: 11 ----------------------
SIST EN 62822-2:2016
– 6 – IEC 62822-2:2016 © IEC 2016
ELECTRIC WELDING EQUIPMENT – ASSESSMENT OF
RESTRICTIONS RELATED TO HUMAN EXPOSURE TO
ELECTROMAGNETIC FIELDS (0 Hz to 300 GHz) –
Part 2: Arc welding equipment
1 Scope

This part of IEC 62822 applies to equipment for arc welding and allied processes designed for

occupational use by professionals and for use by laymen.
NOTE 1 Typical allied processes are electric arc cutting and arc spraying.

This standard specifies procedures for the assessment of human exposure to magnetic fields

produced by arc welding. It covers non-thermal biological effects in the frequency range from

0 Hz to 10 MHz and defines standardized test scenarios.

NOTE 2 The general term “field” is used throughout this document for “magnetic field”.

NOTE 3 For the assessment of exposure to electric fields and thermal effects, the methods specified in the

Generic Standard IEC 62311 apply.

This standard does not define methods for workplace assessment regarding the risks arising

from electromagnetic fields (EMF). However, the EMF data that results from the application of

this standard can be used to assist in workplace assessment.

Other standards may apply to products covered by this standard. In particular this standard

cannot be used to demonstrate electromagnetic compatibility with other equipment. It does

not specify any product safety requirements other than those specifically related to human

exposure to electromagnetic fields.
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.

IEC 60050-851:2008, International Electrotechnical Vocabulary – Part 851: Electric welding

IEC 60974-1, Arc welding equipment – Part 1: Welding power sources
IEC 60974-6, Arc welding equipment – Part 6: Limited duty equipment

IEC 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 61786-2, 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

IEC 62822-1, Electric welding equipment – Assessment of restrictions related to human

exposure to electromagnetic fields (0 Hz to 300 GHz) – Part 1: Product family standard

---------------------- Page: 12 ----------------------
SIST EN 62822-2:2016
IEC 62822-2:2016 © IEC 2016 – 7 –
3 Terms, definitions and abbreviations
3.1 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-851 on

electric welding, in IEC 60974-1 and IEC 60974-6, as well as the following, apply.

3.1.1
basic restrictions
exposure limit value

restrictions on exposure to electric, magnetic and electromagnetic fields that are based

directly on established health effects and biological considerations
3.1.2
exposure index

result of the evaluation of exposure to (both sinusoidal and non-sinusoidal) EMF, expressed

as a fraction or percentage of the permissible values

Note 1 to entry: Fractions higher than 1 (100 %) represent exceeding the permissible values.

3.1.3
general public
individuals of all ages and of varying health conditions

Note 1 to entry: Varying ages and health conditions can increase the individuals susceptibilities to EMF.

3.1.4
general public exposure
the exposure of members of the general public to EMF

Note 1 to entry: In many cases, members of the general public are unaware of their exposure to EMF.

3.1.5
health effects

adverse effects, such as thermal heating or stimulation of nerve and muscle tissue as a result

of human exposure to EMF
3.1.6
intracorporeal
situated or occurring within the body
3.1.7
layman

operator who does not weld in the performance of his profession and may have little or no

formal instruction in welding
[SOURCE: IEC 60050-851:2008, 851-11-14, modified – "arc welding" was replaced by
"welding"]
3.1.8
non-thermal effects

the stimulation of muscles, nerves or sensory organs as a result of human exposure to EMF

3.1.9
occupational exposure

the exposure of workers to EMF at their workplaces, generally under known conditions, and

as a result of performing their regular or assigned job activities
---------------------- Page: 13 ----------------------
SIST EN 62822-2:2016
– 8 – IEC 62822-2:2016 © IEC 2016

Note 1 to entry: A worker is any person employed by an employer, including trainees and apprentices.

3.1.10
reference levels
action levels

directly measurable quantities, derived from basic restrictions, provided for practical exposure

assessment purposes

Note 1 to entry: Respect of the reference levels will ensure respect of the relevant basic restriction. If the

reference levels are exceeded, it does not necessarily follow that the basic restriction will be exceeded.

3.1.11
sensory effects

transient disturbed sensory perceptions and minor changes in brain functions as a result of

human exposure to EMF
3.2 Quantities and units
The internationally accepted SI units are used throughout this document.
Physical quantity Symbol Unit Dimension
Current density J Ampere per square metre A m
Electric conductivity Siemens per metre S m
Electric current I Ampere A
Electric field strength E Volt per metre V m
Frequency ƒ Hertz Hz
Magnetic flux density B Tesla T (Vs m )
Permeability Henry per metre H m
3.3 Constants
Physical constant Symbol Magnitude Dimension
–7 –1
Permeability of free space µ 4⋅π ⋅10 H m
4 Requirements

Equipment shall be assessed as defined in Clause 7, using the methods given in Clause 5

and the conditions defined in Clause 6. The results shall be reported as specified in Clause 7.

5 Assessment methods
5.1 General considerations
5.1.1 Time averaging

Time averaging of exposure is not permitted for non-thermal effects unless the applied

national or international requirements explicitly specify time averaging procedures.

5.1.2 Spatial averaging of external field values

Reference levels are typically based on spatial averaging over the relevant part of the body. If

spatial averaging of exposure is not excluded and no specific procedures are defined in

applicable national and international requirements, the procedures detailed in the relevant

subclauses of 6.1 shall be applied.
---------------------- Page: 14 ----------------------
SIST EN 62822-2:2016
IEC 62822-2:2016 © IEC 2016 – 9 –
5.1.3 Spatial averaging of intracorporeal values

If spatial averaging of exposure is not excluded and no specific procedures are specified in

applicable national and international requirements, the procedures detailed in the relevant

subclauses of 5.3 and 6.1 shall be applied.
5.1.4 Equipment with pulsed or non-sinusoidal welding current
5.1.4.1 General

Several methods for the assessment of pulsed and non-sinusoidal fields are available. For the

purpose of this standard, only the weighted peak methods as given in 5.1.4.2 and 5.1.4.3 are

applicable. For additional information, see IEC 61786-2. The result of these calculation

methods is the exposure index (EI).

NOTE Applications of the weighted peak method in time domain or frequency domain are mathematically

equivalent and give exactly the same results, if applied correctly. For some cases, e.g. when large numbers of

spectral components have to be considered for the complete analysis of a signal, the application of the time

domain method can be less complex.
Phase angles used for the weighted peak methods are given in Table 1.
Table 1 – Phase angles of weighting function or summation function
a) 2 0
proportionality p 1/ƒ 1/ƒ ƒ (constant) ƒ
180° 90° 0° -90°
phase angle ϕ

p is the proportionality factor defining the variation of the basic restriction/reference level as specified in the

applicable national and international requirements.
ϕ is the phase angle of the weighting function or summation function.
5.1.4.2 Weighted peak method in the time domain

For time domain evaluation, an evaluation system which incorporates a weighting function is

applicable. The evaluation shall be based on the peak value of the weighted signal. This

method can be used for both external field levels and intracorporeal metrics.

For comparison with the given exposure levels, the weighting function shall have a freq

...

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