Arc welding equipment - Part 5: Wire feeders

This part of IEC 60974 specifies safety and performance requirements for industrial and professional equipment used in arc welding and allied processes to feed filler wire. The wire feeder may be a stand-alone unit which may be connected to a separate welding power source or one where the welding power source and the wire feeder are housed in a single enclosure. The wire feeder may be suitable for manually or mechanically guided torches. This part of IEC 60974 is not applicable to spool-on torches that are covered by IEC 60974-7. This part of IEC 60974 is not applicable to wire feeders which are designed mainly for use by laymen and design in accordance with IEC 60974-6.

Lichtbogenschweißeinrichtungen - Teil 5: Drahtvorschubgeräte

Matériel de soudage à l'arc - Partie 5: Dévidoirs

La CEI 60974-5:2013 spécifie les exigences de sécurité et de performance pour le matériel industriel et professionnel utilisé en soudage à l'arc et les techniques connexes pour l'alimentation en fil d'apport. Cette troisième édition annule et remplace la deuxième édition parue en 2007 et constitue une révision technique. La présente édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente: - modifications induites par la publication de la CEI 60974-1:2012; - ajout d'un nouveau symbole pour la surface chaude (voir Article 9); - détermination de la charge maximale conformément au 10.7.

Oprema za obločno varjenje - 5. del: Podajalniki žice

Ta del standarda IEC 60974 določa varnostne zahteve in zahteve glede zmogljivosti za panožno ter profesionalno opremo, ki se uporablja pri obločnem varjenju in podobnih postopkih za podajanje žice polnila. Podajalnik žice je lahko samostojna enota, povezana z ločenim napajalnim virom varjenja, ali enota z napajalnim virom varjenja in podajalnikom žice v istem ohišju. Podajalnik žice je lahko primeren za ročni ali mehansko vodeni gorilnik. Ta del standarda IEC 60974 se ne uporablja za gorilnike z navojem, ki jih zajema IEC 60974-7. Ta del standarda IEC 60974 se ne uporablja za podajalnike žice, ki so namenjeni predvsem za laično uporabo in so oblikovani v skladu s standardom IEC 60974-6.

General Information

Status
Published
Publication Date
27-Aug-2013
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
27-Aug-2013
Due Date
01-Nov-2013
Completion Date
28-Aug-2013

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Standards Content (sample)

SLOVENSKI STANDARD
SIST EN 60974-5:2013
01-oktober-2013
1DGRPHãþD
SIST EN 60974-5:2008
2SUHPD]DREORþQRYDUMHQMHGHO3RGDMDOQLNLåLFH
Arc welding equipment - Part 5: Wire feeders
Lichtbogenschweißeinrichtungen - Teil 5: Drahtvorschubgeräte
Matériel de soudage à l'arc - Partie 5: Dévidoirs
Ta slovenski standard je istoveten z: EN 60974-5:2013
ICS:
25.160.30 Varilna oprema Welding equipment
SIST EN 60974-5:2013 en

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

---------------------- Page: 1 ----------------------
SIST EN 60974-5:2013
---------------------- Page: 2 ----------------------
SIST EN 60974-5:2013
EUROPEAN STANDARD
EN 60974-5
NORME EUROPÉENNE
August 2013
EUROPÄISCHE NORM
ICS 25.160 Supersedes EN 60974-5:2008
English version
Arc welding equipment -
Part 5: Wire feeders
(IEC 60974-5:2013)
Matériel de soudage à l'arc - Lichtbogenschweißeinrichtungen -
Partie 5: Dévidoirs Teil 5: Drahtvorschubgeräte
(CEI 60974-5:2013) (IEC 60974-5:2013)

This European Standard was approved by CENELEC on 2013-06-27. 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.

CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels

© 2013 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60974-5:2013 E
---------------------- Page: 3 ----------------------
SIST EN 60974-5:2013
EN 60974-5:2013 - 2 -
Foreword

The text of document 26/503/FDIS, future edition 3 of IEC 60974-5, prepared by IEC/TC 26 "Electric

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

EN 60974-5:2013.
The following dates are fixed:
(dop) 2014-03-27
• 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) 2016-06-27
standards conflicting with the
document have to be withdrawn
This document supersedes EN 60974-5:2008.

EN 60974-5:2013 includes the following significant technical changes with respect to

EN 60974-5:2008:
– changes induced by the publication of EN 60974-1:2012;
– addition of a new symbol for hot surface (as specified in Clause 9);
– determination of the maximum load in accordance with 10.7.
This standard is to be read in conjunction with EN 60974-1.

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.

This standard covers the Principle Elements of the Safety Objectives for Electrical Equipment

Designed for Use within Certain Voltage Limits (LVD - 2006/95/EC).
Endorsement notice

The text of the International Standard IEC 60974-5:2013 was approved by CENELEC as a European

Standard without any modification.

In the official version, for Bibliography, the following note has to be added for the standard indicated:

IEC 60974-6 NOTE Harmonised as EN 60974-6.
---------------------- Page: 4 ----------------------
SIST EN 60974-5:2013
- 3 - EN 60974-5:2013
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 When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD

applies.
Publication Year Title EN/HD Year
IEC 60050-195 - International Electrotechnical Vocabulary - -
(IEV) -
Chapter 195: Earthing and protection against
electric shock
IEC 60529 - Degrees of protection provided by EN 60529 -
enclosures (IP Code)
IEC 60974-1 2012 Arc welding equipment - EN 60974-1 2012
Part 1: Welding power sources
IEC 60974-7 - Arc welding equipment - EN 60974-7 -
Part 7:Torches
IEC 60974-10 - Arc welding equipment - EN 60974-10 -
Part 10: Electromagnetic compatibility (EMC)
requirements
IEC 61140 - Protection against electric shock - Common EN 61140 -
aspects for installation and equipment
---------------------- Page: 5 ----------------------
SIST EN 60974-5:2013
---------------------- Page: 6 ----------------------
SIST EN 60974-5:2013
IEC 60974-5
Edition 3.0 2013-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Arc welding equipment –
Part 5: Wire feeders
Matériel de soudage à l’arc –
Partie 5: Dévidoirs
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX S
ICS 25.160 ISBN 978-2-83220-825-0

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 60974-5:2013
– 2 – 60974-5 © IEC:2013
CONTENTS

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

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

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

3 Terms and definitions ....................................................................................................... 6

4 Environmental conditions .................................................................................................. 7

5 Tests ................................................................................................................................ 7

5.1 Test conditions ........................................................................................................ 7

5.2 Measuring instruments ............................................................................................ 7

5.3 Conformity of components ....................................................................................... 8

5.4 Type tests ............................................................................................................... 8

5.5 Routine tests ........................................................................................................... 8

6 Protection against electric shock ...................................................................................... 8

6.1 Insulation ................................................................................................................ 8

6.2 Protection against electric shock in normal service (direct contact) ......................... 8

6.2.1 Protection provided by the enclosure ........................................................... 8

6.2.2 Capacitors ................................................................................................... 9

6.2.3 Automatic discharge of supply circuit capacitors .......................................... 9

6.2.4 Isolation of the welding circuit ...................................................................... 9

6.2.5 Welding circuit touch current ....................................................................... 9

6.2.6 Touch current in normal condition ................................................................ 9

6.3 Protection against electric shock in case of a fault condition (indirect contact) ...... 10

6.3.1 Protective provisions ................................................................................. 10

6.3.2 Isolation between windings of the supply circuit and the welding

circuit ........................................................................................................ 10

6.3.3 Internal conductors and connections .......................................................... 10

6.3.4 Isolation of the welding circuit from the frame ............................................ 10

6.3.5 Touch current in fault condition .................................................................. 10

6.4 Supply voltage ....................................................................................................... 10

6.5 Protective provisions ............................................................................................. 10

6.6 Overcurrent protection of the supply circuit............................................................ 11

6.7 Cable anchorage ................................................................................................... 11

6.8 Auxiliary power supply ........................................................................................... 11

6.9 Inlet openings ........................................................................................................ 11

6.10 Control circuits ...................................................................................................... 11

6.11 Isolation of hanging means .................................................................................... 11

7 Liquid cooling system ..................................................................................................... 11

8 Shielding gas supply....................................................................................................... 11

9 Thermal requirements ..................................................................................................... 12

10 Mechanical provisions .................................................................................................... 12

10.1 Wire feeder ........................................................................................................... 12

10.2 Enclosure strength ................................................................................................ 12

10.3 Handling means .................................................................................................... 13

10.4 Drop withstand ...................................................................................................... 13

10.5 Tilting stability ....................................................................................................... 13

10.6 Filler wire supply ................................................................................................... 13

---------------------- Page: 8 ----------------------
SIST EN 60974-5:2013
60974-5 © IEC:2013 – 3 –

10.6.1 Filler wire supply mounting ........................................................................ 13

10.6.2 Wire spool retaining device ........................................................................ 13

10.6.3 Filler wire over-run .................................................................................... 13

10.7 Feeding ................................................................................................................. 14

10.8 Protection against mechanical hazards .................................................................. 14

11 Rating plate .................................................................................................................... 15

11.1 General ................................................................................................................. 15

11.2 Description ............................................................................................................ 15

11.3 Contents................................................................................................................ 15

12 Indication of wire-feed speed .......................................................................................... 16

13 Instructions and markings ............................................................................................... 16

13.1 Instructions ........................................................................................................... 16

13.2 Markings ............................................................................................................... 17

Annex A (normative) Determination of the variation in wire-feed speed ................................ 18

Annex B (informative) Example for a rating plate of a stand-alone wire feeder ..................... 20

Bibliography .......................................................................................................................... 21

Figure 1 – Principle of the rating plate of stand-alone wire feeder ......................................... 15

Table 1 – Minimum degree of protection ................................................................................. 9

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SIST EN 60974-5:2013
– 4 – 60974-5 © IEC:2013
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
ARC WELDING EQUIPMENT –
Part 5: Wire feeders
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 60974-5 has been prepared by IEC technical committee 26:

Electric welding.

This third edition cancels and replaces the second edition published in 2007 and constitutes a

technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
– changes induced by the publication of IEC 60974-1:2012;
– addition of a new symbol for hot surface (as specified in Clause 9);
– determination of the maximum load in accordance with 10.7.
---------------------- Page: 10 ----------------------
SIST EN 60974-5:2013
60974-5 © IEC:2013 – 5 –
The text of this standard is based on the following documents:
FDIS Report on voting
26/503/FDIS 26/507/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.

This standard shall be used in conjunction with IEC 60974-1.

The list of all the parts of IEC 60974, under the general title Arc welding equipment, can be

found on the IEC web site.

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

the stability date indicated on the IEC web site 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.
---------------------- Page: 11 ----------------------
SIST EN 60974-5:2013
– 6 – 60974-5 © IEC:2013
ARC WELDING EQUIPMENT –
Part 5: Wire feeders
1 Scope

This part of IEC 60974 specifies safety and performance requirements for industrial and

professional equipment used in arc welding and allied processes to feed filler wire.

The wire feeder may be a stand-alone unit which may be connected to a separate welding

power source or one where the welding power source and the wire feeder are housed in a

single enclosure.
The wire feeder may be suitable for manually or mechanically guided torches.

This part of IEC 60974 is not applicable to spool-on torches that are covered by IEC 60974-7.

This part of IEC 60974 is not applicable to wire feeders which are designed mainly for use by

laymen and design in accordance with IEC 60974-6.
NOTE 1 Typical allied processes are electric arc cutting and arc spraying.

NOTE 2 This standard does not include electromagnetic compatibility (EMC) requirements.

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 60050-195, International Electrotechnical Vocabulary (IEV) – Part 195: Earthing and

protection against electric shock
IEC 60529, Degrees of protection provided by enclosures (IP Code)
IEC 60974-1:2012, Arc welding equipment – Part 1: Welding power sources
IEC 60974-7, Arc welding equipment – Part 7: Torches

IEC 60974-10, Arc welding equipment – Part 10: Electromagnetic compatibility (EMC)

requirements

IEC 61140, Protection against electric shock – Common aspects for installation and

equipment
3 Terms and definitions

For the purposes of this document, the terms and definitions given in IEC 60050-195,

IEC 60974-1, and IEC 60974-7, as well as the following apply.
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SIST EN 60974-5:2013
60974-5 © IEC:2013 – 7 –
3.1
drive roll

roll in contact with the filler wire and which transfers mechanical power to the filler wire

3.2
filler wire supply

source of filler wire and means for dispensing filler wire to the feeding mechanism

3.3
liner
replaceable component that guides the filler wire
3.4
maximum load

maximum value of the force required to feed the specified types and sizes of filler wires over

the rated speed range
3.5
rated speed range

speed range of the filler wire assigned by the manufacturer for each specified size of filler

wire
3.6
rated supply current
r.m.s. value of an input current to the wire feeder at maximum load
3.7
wire-feed control

electrical or mechanical apparatus, or both, which control(s) the speed of the filler wire, the

sequence of operations and other services as required

Note 1 to entry: The wire feed control may be integral with the wire feeder or in a separate enclosure.

3.8
wire feeder

equipment that delivers filler wire to the arc or weld zone which includes means to apply

motion to the filler wire

Note 1 to entry: The wire feeder may also include the wire-feed control, the filler wire supply, devices for gas

control, indicators and remote connectors.
4 Environmental conditions
As specified in Clause 4 of IEC 60974-1:2012.
5 Tests
5.1 Test conditions
As specified in 5.1 of IEC 60974-1:2012.
5.2 Measuring instruments
The accuracy of measuring instruments shall be:
---------------------- Page: 13 ----------------------
SIST EN 60974-5:2013
– 8 – 60974-5 © IEC:2013

a) electrical measuring instruments: class 1 (±1 % of full-scale reading), except for the

measurement of insulation resistance and dielectric strength where the accuracy of the

instruments is not specified, but shall be taken into account for the measurement;

b) thermometer: ±2 K;
c) tachometer: ± 1 % of full-scale reading;
d) pressure measuring instruments: class 2,5 (±2,5 % of full-scale reading).
5.3 Conformity of components
As specified in 5.3 of IEC 60974-1:2012.
5.4 Type tests
All type tests given below shall be carried out on the same wire feeder.

As a condition of conformity the type tests given below shall be carried out in the following

sequence:
a) visual inspection (as defined in 3.7 of IEC 60974-1:2012);

b) insulation resistance (as specified in 6.1.4 of IEC 60974-1:2012 (preliminary check));

c) enclosure (as specified in 14.2 of IEC 60974-1:2012);
d) handling means (as specified in 10.3);
e) drop withstand (as specified in 10.4);
f) protection provided by the enclosure (as specified in 6.2.1);
g) insulation resistance (as specified in 6.1.4 of IEC 60974-1:2012);
h) dielectric strength (as specified in 6.1.5 of IEC 60974-1:2012);
i) visual inspection (as defined in 3.7 of IEC 60974-1:2012).

The other tests included in this standard and not listed here shall be carried out, but may be

completed in any convenient sequence.
5.5 Routine tests

All routine tests given below shall be carried out on each wire feeder in the following

sequence:
a) visual inspection in accordance with manufacturer’s specification;

b) continuity of the protective circuit, if applicable (as specified in 10.5.3 of IEC 60974-

1:2012);
c) dielectric strength (as specified in 6.1.5 of IEC 60974-1:2012);
6 Protection against electric shock
6.1 Insulation
As specified in 6.1 of IEC 60974-1:2012.
6.2 Protection against electric shock in normal service (direct contact)
6.2.1 Protection provided by the enclosure

Wire feeders shall have a minimum degree of protection in accordance with Table 1 using

IEC 60529 test procedures and conditions.
---------------------- Page: 14 ----------------------
SIST EN 60974-5:2013
60974-5 © IEC:2013 – 9 –
Table 1 – Minimum degree of protection
Designed for Designed for
Component
indoor use outdoor use
Motor and control supplied by a voltage ≤ SELV IP2X IP23S
IP21S IP23S
Motor and control supplied by a voltage > SELV
Live parts at welding potential for wire feeders used with
manually guided torches (for example, filler wire, wire spool, IPXX IPX3
drive rolls)
Live parts at welding potential for wire feeders used with
mechanically guided torches (for example, filler wire, wire IPXX IPXX
spool, drive rolls)
NOTE Additional requirement for mechanical hazards are given in 10.8.

Wire feeders with degree of protection IP23S may be stored but are not intended to be used

outside during precipitation unless sheltered.

Adequate drainage shall be provided by the enclosure. Retained water shall not interfere with

the correct operation of the equipment or impair safety. The quantity of water that may enter

the enclosure during the following test is not limited.
Conformity shall be checked by the following test:

The filler wire shall be fed into the drive system and all external connectors shall be

connected or covered.

The wire feeder shall be subjected to the appropriate water test without being energized.

Immediately after the test, the wire feeder shall be moved to a safe environment and

subjected to the insulation resistance test, listed in 5.4 g) and dielectric strength test, listed in

5.4 h).

When live parts at welding potential are protected against precipitation, the filler wire shall

show no visual wetness after the test.
6.2.2 Capacitors
As specified in 6.2.2 of IEC 60974-1:2012.
6.2.3 Automatic discharge of supply circuit capacitors
As specified in 6.2.3 of IEC 60974-1:2012.
6.2.4 Isolation of the welding circuit
As specified in 6.2.4 of IEC 60974-1:2012.
6.2.5 Welding circuit touch current
For Class I stand-alone wire feeders, as specified in 6.2.5 of IEC 60974-1:2012.
6.2.6 Touch current in normal condition
As specified in 6.2.6 of IEC 60974-1:2012.
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SIST EN 60974-5:2013
– 10 – 60974-5 © IEC:2013

6.3 Protection against electric shock in case of a fault condition (indirect contact)

6.3.1 Protective provisions

Wire feeder shall be class I, class II or class III equipment in accordance with IEC 61140, with

the exception of the welding circuit.
6.3.2 Isolation between windings of the supply circuit and the welding circuit
As specified in 6.3.2 of IEC 60974-1:2012.
6.3.3 Internal conductors and connections
As specified in 6.3.3 of IEC 60974-1:2012.
6.3.4 Isolation of the welding circuit from the frame

Live parts at welding potential (for example, filler wire, wire spool, drive rolls) shall be isolated

from the wire feeder frame or other structure to which they are attached by basic insulation

(minimum clearances are specified in Tables 1 of IEC 60974-1:2012 and minimum creepage

distances are specified in Table 2 of IEC 60974-1:2012).
Conformity shall be checked as specified in 6.1.2 and 6.1.3 of IEC 60974-1:2012.
6.3.5 Touch current in fault condition
For Class I stand-alone wire feeders, as specified in 6.3.6 of IEC 60974-1:2012.
6.4 Supply voltage

The supply voltage shall be supplied from a welding power source as specified in 11.5 of

IEC 60974-1:2012 or from the supply network provided that 6.5 is met.
6.5 Protective provisions

Connection of exposed conductive parts to the protective conductor is not required if the

supply voltage is supplied by the welding circuit or safety extra low voltage (SELV).

Connection of exposed conductive parts to the protective conductor is required if the wire

feeder is rated for supply voltages above SELV. The protective conductor connection shall be

secured to the frame or enclosure by a screw or fastening that shall not require removal

during any servicing operation. Solder alone shall not be used for securing the protective

conductor terminals.

The welding circuit and conductive parts connected to the welding circuit shall not be

connected to the protective conductor.

Where a protective conductor is used, it shall be protected against damage by stray welding

currents, for example, by a device to sense welding current in the protective earth conductor

under a fault condition and to de-energize the welding circuit or by insulation of the relevant

metal parts, for example, by an enclosure.

Conformity shall be checked by visual inspection and performing the following fault

simulations:

a) applying a current not greater than the rated current value of the protective conductor;

b) p
...

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