SIST EN 50678:2020
(Main)General procedure for verifying the effectiveness of the protective measures of electrical equipment after repair
General procedure for verifying the effectiveness of the protective measures of electrical equipment after repair
This document specifies requirements for setting a uniform procedure to verify the effectiveness of the protective measures for current-using electrical equipment or appliances after they have been repaired.
This procedure is applicable to equipment or appliances that are pluggable equipment type A connected to final circuits via a plug or permanently connected equipment, with a rated voltage above 25 V AC and 60 V DC up to 1 000 V AC and 1 500 V DC, and currents up to 63A.
This standard does not cover:
- type tests, routine tests and acceptance tests for product safety requirements and product functional requirements.
NOTE Product safety requirements and product functional requirements are specified in the related product standards.
This document assumes that the electrical equipment under consideration complies with its related product standard, has been introduced on the market, has been in use, has failed, and has then been repaired.
It intends to verify that operations for repairs have not jeopardized basic protective measures, for example to verify the continuity of the protective conductor, the withstand capability of the insulation or to verify that no metallic part is loose or is inadvertently inserted in the device.
This document does not apply to:
- devices and equipment that are part of the fix electrical installations. For these devices, tests for verification after repair are covered by IEC 60364 6;
- audio/video, information and communication technology equipment;
- uninterruptible Power Supply (UPS);
- charging stations for electro-mobility;
- power supplies;
- programmable Logic Controllers (PLC);
- power Drives;
- devices for EX-zones or for mining applications in general;
- products already covered by standards addressing similar topics such as:
- medical equipment covered by IEC 60601 1. For these devices, tests for verification after repair are covered by IEC 62353;
- arc welding equipment covered by IEC 60974 1. For these devices, tests for verification after repair are covered by IEC 60974 4.
Allgemeines Verfahren zur Überprüfung der Wirksamkeitder Schutzmaßnahmen von Elektrogeräten nach der Reparatur
Procédure générale visant à vérifier l'efficacité des mesures de protection des équipements électriques après réparation
Le présent document spécifie les exigences relatives à la définition d'une procédure uniforme visant à vérifier l'efficacité des mesures de protection pour les matériels ou appareils d'utilisation après leur réparation.
Cette procédure s'applique aux matériels ou appareils d'utilisation avec une tension assignée supérieure à 25 V en courant alternatif et 60 V en courant continu jusqu'à 1 000 V en courant alternatif et 1 500 V en courant continu et des courants jusqu'à 63 A, raccordés à des circuits terminaux. Il peut s'agir d'équipements enfichables de type A ou d'équipements reliés en permanence.
Le présent document ne vise pas à remplacer les essais couverts par les normes de sécurité ou les normes de produit, par exemple les essais de type, les essais individuels de série et les essais d'acceptation.
Le présent document retient l'hypothèse que les matériels ou appareils d'utilisation à l'étude sont conformes à la norme de produit associée, qu'ils ont été mis sur le marché, qu'ils ont été utilisés, qu'ils ont subi une panne et qu'ils ont ensuite été réparés.
Il vise à vérifier que les actions de réparation n'ont pas compromis les mesures de protection de base, pour contrôler par exemple la continuité du conducteur de protection, la capacité de tenue de l'isolement, ou pour contrôler qu'aucune pièce métallique ne s'est desserrée ou n'a été insérée dans l'appareil par inadvertance.
Ce document ne s'applique pas aux:
— essais récurrents définis dans l'EN 50699;
— dispositifs et équipements qui font partie des installations électriques fixes. Pour ceux-ci, les essais concernant la vérification après réparation sont couverts par la norme HD 60364 6;
— équipements des technologies de l'audio/vidéo, de l'information et de la communication;
— alimentations sans interruptions (ASI);
— bornes de charge pour l'électromobilité;
— alimentations;
— automates programmables (AP);
— entraînements de puissance;
— dispositifs pour les zones explosives (EX) ou pour les applications minières en général;
— produits déjà couverts par des normes traitant de sujets similaires, tels que:
— les appareils médicaux couverts par l'EN 60601 1. Pour ces dispositifs, les essais concernant la vérification après réparation sont couverts par l'EN 62353;
— le matériel de soudage à l'arc couvert par l'EN IEC 60974 1. Pour ces dispositifs, les essais concernant la vérification après réparation sont couverts par l'EN 60974 4;
— les machines couvertes par l'EN 60204-1. Pour ces dispositifs, l'EN 60204-1 s'applique.
Splošni postopek preverjanja učinkovitosti zaščitnih ukrepov za električno opremo po popravilu
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 50678:2020
01-julij-2020
Splošni postopek preverjanja učinkovitosti zaščitnih ukrepov za električno
opremo po popravilu
General procedure for verifying the effectiveness of the protective measures of electrical
equipment after repair
Allgemeines Verfahren zur Überprüfung der Wirksamkeitder Schutzmaßnahmen von
Elektrogeräten nach der Reparatur
Procédure générale visant à vérifier l'efficacité des mesures de protection des
équipements électriques après réparation
Ta slovenski standard je istoveten z: EN 50678:2020
ICS:
17.220.20 Merjenje električnih in Measurement of electrical
magnetnih veličin and magnetic quantities
SIST EN 50678:2020 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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SIST EN 50678:2020
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SIST EN 50678:2020
EUROPEAN STANDARD EN 50678
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2020
ICS 17.220.20
English Version
General procedure for verifying the effectiveness of the
protective measures of electrical equipment after repair
Procédure générale visant à vérifier l'efficacité des mesures Allgemeines Verfahren zur Überprüfung der Wirksamkeit
de protection des équipements électriques après réparation der Schutzmaßnahmen von Elektrogeräten nach der
Reparatur
This European Standard was approved by CENELEC on 2019-12-16. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, the
Netherlands, Norway, Poland, Portugal, Republic of North Macedonia, 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: Rue de la Science 23, B-1040 Brussels
© 2020 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50678:2020 E
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EN 50678:2020 (E)
Contents Page
European foreword . 3
Introduction . 3
1 Scope . 5
2 Normative references . 6
3 Terms and definitions . 6
4 Requirements . 9
5 Tests . 9
5.1 General . 9
5.1.1 General test conditions . 9
5.1.2 Visual inspection . 10
5.1.3 Test of the protective measures against electric hazards . 10
5.1.4 Confirmation of the compliance of additional protective measures . 10
5.1.5 Documentation and evaluation of test . 10
5.2 Visual inspection . 11
5.3 Measurement of protective bonding resistance . 11
5.4 Measurement of the insulation resistance . 14
5.5 Measurement of protective conductor current . 21
5.6 Measurement of the touch-current . 27
5.7 Confirmation of the compliance of the specifications for the protective measure
SELV/PELV . 31
5.8 Measurement of the leakage current produced by a floating input with a rated input
voltage above 50 V AC or 120 V DC . 31
5.9 Confirmation of the operation of further protective measures . 32
5.10 Confirmation of the polarity of mains plug wiring . 32
5.11 Functional test . 32
6 Documentation and evaluation of test . 32
7 Test equipment . 33
Annex A (informative) General guidance and rationale . 34
A.1 Intended audience . 34
A.2 Rationale . 35
A.2.1 Clause 5 – Tests . 35
A.2.2 Subclause 5.3 – Measuring of protective bonding resistance . 35
A.2.3 Subclause 5.4 – Measurement of insulation resistance . 35
A.2.4 Alternative method . 37
A.2.5 Differential method . 37
Annex B (informative) Schematics for test sequences . 38
Annex D (normative) Special National Conditions . 41
Bibliography . 42
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European foreword
This document (EN 50678:2020) has been prepared by CLC/TC 85X “Measuring equipment for
electrical and electromagnetic quantities”.
The following dates are fixed:
• latest date by which this document has (dop) 2020-12-16
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2022-12-16
standards 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.
3
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EN 50678:2020 (E)
Introduction
This standard intends to provide a general test procedure to verify the effectiveness of the basic
protective measures for current-using equipment or appliances after they have been repaired, thus
ensuring the safety of people using repaired equipment.
This standard may be considered to support compliance with the European Directive 2009/104/EU
concerning the minimum safety and health requirements for the use of work equipment by workers at
work.
In general, the test procedure for verification of products after repair is the responsibility of the related
product technical committees. This document may be taken into consideration by product technical
committees if they need to take into consideration modified or additional tests for verification after
repairs for products falling within their scope.
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1 Scope
This document specifies requirements for setting a uniform procedure to verify the effectiveness of the
protective measures for current-using equipment or appliances after they have been repaired.
This procedure is applicable to current-using equipment or appliances with a rated voltage above 25 V
AC and 60 V DC up to 1 000 V AC and 1 500 V DC, and currents up to 63 A, connected to final
circuits. They may be either pluggable equipment type A connected or permanently connected.
This document is not intended to replace test covered by safety standards nor product standards, for
example type tests, routine tests and acceptance tests.
This document assumes that the current-using equipment or appliances under consideration complies
with its related product standard, has been introduced on the market, has been in use, has failed, and
has then been repaired.
It intends to verify that operations for repairs have not jeopardized basic protective measures, for
example to verify the continuity of the protective conductor, the withstand capability of the insulation or
to verify that no metallic part is loose or is inadvertently inserted in the device.
This document does not apply to:
1
— recurrent tests defined in EN 50699;
— devices and equipment that are part of the fixed electrical installations. For these, tests for
verification after repair are covered by HD 60364-6;
— audio/video, information and communication technology equipment;
— uninterruptible Power Supply (UPS);
— charging stations for electro-mobility;
— power supplies;
— programmable Logic Controllers (PLC);
— power Drives;
— devices for EX-zones or for mining applications in general;
— products already covered by standards addressing similar topics such as:
— medical equipment covered by EN 60601-1. For these devices, tests for verification after
repair are covered by EN 62353;
— arc welding equipment covered by EN IEC 60974-1. For these devices, tests for verification
after repair are covered by EN 60974-4.
— machinery covered by EN 60204-1. For these devices, EN 60204-1 applies.
___________
1
Under preparation. Stage at time of publication: prEN 50699:2019.
5
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EN 50678:2020 (E)
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
HD 60364-6, Low-voltage electrical installations — Part 6: Verification (IEC 60364-4)
EN 61557 (series), Electrical safety in low voltage distribution systems up to 1 000 V AC and 1 500 V
DC — Equipment for testing, measuring or monitoring of protective measures (IEC 61557, series)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
NOTE Some of the definitions may differ from those in the product standards for type testing, as different
test methods are used.
3.1
electrical safety
protection within an equipment which limits the effects of electrical current on a user or other
individuals
Note 1 to entry: Safety is defined as freedom from unacceptable risk (refer to ISO 14971:2007, definition
2.24).
3.2
testing
visual control, measure and prove the electric equipment after repair to assure that equipment remains
safe to use
3.3
repair
means for restoration of the intended function of the equipment
3.4
(electrically) skilled person
person with relevant education and experience to enable him or her to perceive risks and to avoid
hazards which electricity can create
[SOURCE: IEC 60050-195:1998, 195-04-01]
3.5
electrical equipment
single apparatus using electrical energy and connected by plug or permanently connected to a final
circuit of the distribution system
Note 1 to entry: Equipment includes those accessories as defined by the manufacturer that are necessary to
enable the normal use of the equipment.
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3.6
final circuit (of buildings)
electric circuit intended to supply directly electric current to current-using equipment or socket-outlets
[SOURCE: IEC 60050-826:2004, 826-14-03]
3.7
leakage current
current flowing from live parts of the equipment to earth
[SOURCE: IEC 60050-442:1998, 442-01-24 modified – the term has changed and a reference to the
absence of an insulation fault has been removed]
3.8
touch-current
electric current passing through a human body or through an animal body when it touches one or more
accessible parts of electrical equipment not connected to protective earth
[SOURCE: IEC 60050-195:1998, 195-05-21 modified – the wording of the definition has been
narrowed to electrical equipment not connected to protective earth]
3.9
protective conductor current
electric current which flows in a protective conductor and is frequency weighted according to the
characteristics of the human body
[SOURCE: IEC 60050-826:2004, 826-11-21, modified – the wording of the definition has been
expanded.]
3.10
residual current
vectorial sum of the currents flowing in the live conductors of the mains circuit of the equipment and
frequency weighted according to the characteristics of the human body
[SOURCE: IEC 60050-442:1998, 442-05-19 modified – the wording of the definition has been
expanded]
3.11
insulation resistance
resistance under specified conditions between two conductive elements separated by insulating
materials
[SOURCE: IEC 60050-151:2001, 151-15-43]
3.12
protective bonding resistance
resistance between any accessible conductive part, which has to be connected for safety purposes to
the protective earth terminal, and the
— protective terminal of the mains plug, or
— protective terminal of the equipment inlet, or
— protective terminal permanently connected to the supply mains,
resistance between protective earth terminals at each end of a detachable power supply cord,
extension leads and multi-way adapters
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3.13
SELV
electric system in which the voltage cannot exceed the value of extra-low voltage:
— under normal conditions and
— under single fault conditions, including earth faults in other electric circuits
Note 1 to entry: SELV is the abbreviation for safety extra-low voltage.
[SOURCE: IEC 60050-826:2004, 826-12-31]
3.14
PELV
electric system in which the voltage cannot exceed the value of extra-low voltage:
— under normal conditions and
— under single fault conditions, except earth faults in other electric circuits
Note 1 to entry: PELV is the abbreviation for protective extra-low voltage.
[SOURCE: IEC 60050-826:2004, 826-12-32]
3.15
permanently connected equipment
equipment that can only be electrically connected to or disconnected from the mains by the use of a
tool
3.16
pluggable equipment type A
equipment that is intended for connection to the mains via a non-industrial plug and socket outlet or
via a non-industrial appliance coupler, or both
Note 1 to entry: Examples are plugs and socket-outlets covered by standards such as IEC/TR 60083 and
EN 60320-1.
3.17
current-using equipment
electric equipment intended to convert electric energy into another form of energy, for example light,
heat, mechanical energy
[SOURCE: IEC 60050-826:2004, 826-16-02]
3.18
hazardous-live-part
live part which, under certain conditions, can give a harmful electric shock
[SOURCE: IEC 60050-826:2004, 826-12-13]
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4 Requirements
Tests after repair shall only be performed by an electrically skilled person.
Additional requirements (e.g. for the mechanical safety or for fire protection) according to the
requirements from the product safety standard shall be considered.
If testing the equipment requires additional knowledge or additional test and test equipment, for
example equipment for microwaves, tests shall be done according to the instructions of the
manufacturer.
All tests shall be performed in such a manner that the risk for testing personnel or other individuals
shall be reduced by appropriate protective measures.
If not otherwise stated, all values for current and voltage are the RMS values of an alternating, direct
or composite voltage or current.
The applicable tests as listed in Clause 5 shall be used to advise that:
— there are no visible faults on safety related parts, which are accessible by the user, and
— by the intended use of the equipment, no hazard for the user or the environment originates.
The electrically skilled person who is responsible for the test shall decide if additional tests are
required to meet the protective measures.
The electrically skilled person may decide that, for equipment that is connected to the distribution
system with fixed and protected wiring and is not intended to be hand-held during operation, the test is
carried out according to this standard and/or according to HD 60364-6.
The test procedure shall be interrupted, and the equipment shall be disconnected from mains and
marked as failed, if it is found that during the test:
— reduced safety levels are present due to damage or from unintended use, and/or
— functional hazards could occur.
5 Tests
5.1 General
5.1.1 General test conditions
The tests may be performed at the ambient temperature, humidity and atmospheric pressure present
at the location of testing. The operational limits of the test equipment and the equipment under test
(EUT) shall be considered.
The test equipment shall be tested according to the test steps in 5.1.2 to 5.1.5, as long as it is possible
with the EUT. The sequence of testing shall be as defined in this standard.
For schematics of test sequences, see Annex B.
Each individual test shall be passed before proceeding to the next test.
If it is not possible to perform a certain test step, an electrically skilled person shall decide if the safety
of the EUT can be confirmed without the test step or by other means.
NOTE 1 Manufacturer’s instructions on tests to be performed after repair can be considered as other means.
The values in this standard shall be used unless the product standard specifically provides in-service
limits in which case the product standard limits shall be used.
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NOTE 2 If other external equipment is connected to the EUT, for example via data connectors, measured
values will be for the total system including the external equipment or accessories. If the external equipment is
disconnected from the mains but remains connected to the EUT, measurements can still be influenced such that it
is not possible to correctly access the safety of the EUT.
If it is obvious that the EUT is contaminated by dust or moisture, it is allowed to clean the EUT and/or
the EUT is allowed to dry before starting the tests.
5.1.2 Visual inspection
Visual inspection shall be performed according to 5.2.
5.1.3 Test of the protective measures against electric hazards
Test of the protective measures against electric hazards shall be performed according to 5.3 to 5.8.
— Confirmation of the effectiveness of the protective bonding to all accessible conductive parts
connected for safety reasons to protective earth according to 5.3.
— Confirmation of the effectiveness of the insulation by measuring the insulation resistance between
live parts and accessible conductive parts:
— connected to protective earth (primarily on class I equipment) according to 5.4;
— protected by double or reinforced insulation and not connected to protective earth (primarily
on class II equipment but also on class I equipment) according to 5.4;
— protected by SELV/PELV according to 5.4.
— Confirmation of the compliance with the limits for the leakage currents by measuring of:
— the protective conductor current according to 5.5;
— The touch-current of accessible conductive parts not connected to protective earth, if
applicable, according to 5.6.
NOTE 1 The measurement of leakage current can be omitted on extension leads, detachable power cables,
multiple socket-outlets without electrical parts between live conductors and protective earth.
NOTE 2 In general this standard does not address the measurement of DC leakage currents.
— Confirmation of the compliance with the requirements for the protective measure SELV/PELV by
measuring the output voltage, if the output voltage is accessible according to 5.7.
— Confirmation of the compliance with the limits for the leakage currents produced by a floating
input with a rated input voltage above 50 V AC or 120 V DC according to 5.8.
— Confirmation of the compliance of the polarity of mains plug wiring according to 5.11.
5.1.4 Confirmation of the compliance of additional protective measures
Confirmation of the compliance of additional protective measures shall be according to 5.9.
5.1.5 Documentation and evaluation of test
The documentation and the evaluation of the tests shall be according to Clause 6.
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5.2 Visual inspection
The visual inspection shall take place to detect external defects and, if possible, to determine the
qualification of the suitability of the equipment for the environment.
Special attention shall be paid to the following (if any):
— any damage or contamination;
— all cables and connectors fulfil the requirements of their intended use;
— condition of the mains plug and the mains connectors and conductors;
— defects of the strain relief of the mains supply cord;
— defect of the mains lead cleat;
— condition of anchorage, cable clip, accessible fuse insert;
— damage of the housing and protective cover that may give access to live or dangerous moving
parts;
— signs of overload or overheating or unintended use;
— signs of improper change;
— signs of contamination, corrosion and improper aging;
— contamination, blockage of cooling inlets;
— condition of air filter;
— density of container for water, air, or other medium, condition of pressure control valve;
— usability of switches, control and setup equipment;
— readability of all safety relevant markings or symbols, of the ratings and of the position indicators;
— all fuses accessible from the outside are complying with the data given by the manufacturer (rated
current, characteristics);
— the integrity of mechanical parts;
— assess the relevant accessories together with the equipment (e.g. detachable or fixed power
supply cords tubing);
— defect due to over-bending of cords, cables, hoses and tubing.
NOTE It is appropriate to determine during the visual inspection, if accessible conductive parts, that have to
be tested according to 5.3 to 5.8, are present.
5.3 Measurement of protective bonding resistance
The integrity of the connection between:
— the protective earth terminal of the equipment (where applicable contact on the mains plug) and
— each accessible conductive part intended to be connected to the protective earth. Additional
confirmation is needed for all parts that are visible during repair.
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EN 50678:2020 (E)
The integrity of those connections shall be confirmed by:
— visually inspecting the entire length of the protective earth path according to 5.2;
— measuring the resistance of each protective terminal; and
NOTE 1 During the measurement the conductor is flexed over the entire length and at the point of entry on the
equipment and the mains plug.
— checking by hand to ensure that the anchorages and the inlets of each connector are properly
fixed.
Test circuits according to Figure 1a or Figure 1b may be used.
2
For cable lengths up to 5 m and a cross section area up to 1,5 mm , the protective bonding resistance
shall not exceed 0,3 Ω. For each further 7,5 m cable length 0,1 Ω shall be added to the limit up to a
maximum value of 1 Ω.
2
For cross section areas above 1,5 mm and other cable lengths the limit shall be calculated by the
following formula:
II
R= p+Ω0,1 or R= +Ω0,1
A κA
where
R is the electrical resistance (Ω);
ρ is the standard value of electrical conductivity (m/(Ω mm2) for the metal used for the PE
conductor;
l is the length of the cable in meters (m);
2
A is the cross-sectional area of the conductor in square millimetres (mm );
2
κ is the electrical conductivity (m/(Ω mm ).
NOTE 2 The value of 0,1 Ω in the equation above considers the influence of the contact resistance.
It is recommended that care be taken to ensure that the contact resistance between the test probe and
the metal part under test does not influence the test result.
When equipment is permanently connected to the distribution system, an earth reference point on the
fixed installation is required to measure the earth continuity. The protective earth conductor shall not
be disconnected from the installation and protective covers shall not be removed.
NOTE 3 During this measurement parallel earth connections, for example due to the type of installation (water
pipe or data line), can influence the result.
Some equipment may have accessible metal parts which are earthed only for functional or screening
purposes with protection against electric shock being provided by double or reinforced insulation. It is
important that these non-safety earthed metal parts are not subjected to a high current test otherwise
damage may result.
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EN 50678:2020 (E)
Key for all Figures 1 to 4
G generating measuring supply
PE Protective Earth
L Live
MΩ Ohm meter
N Neutral
U Measured voltage
1 measuring device
2 equipment under test (EUT)
3 fuse or circuit breaker
4 socket
5 N (neutral) or live interrupted
6.1 test point(s), accessible conductive parts, connected to PE
6.2 test point(s), accessible conductive parts, not connected to PE
7 earth potential
8 equipment is isolated from earth
9.1 test probe to protective earth and to accessible protective parts, connected to PE
9.2 test probe to protective earth and to accessible protective parts, not connected to PE
9.3 test probe to live parts
10 possible parallel earth connection
11 double or reinforced insulation
Figure 1a — Example of test circuit for the measurement of protective earth resistance in
equipment that is disconnected from the supply mains
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Figure 1b — Example of test circuit for the measurement of protective earth resistance in
equipment, which for functional reasons cannot be disconnected from supply mains, or in
equipment or permanently connected to mains
5.4 Measurement of the insulation resistance
The insulation resistance shall be measured:
— between live parts and each accessible conductive part, including protective earth (except PELV);
— between live parts of a SELV/PELV circuit and live parts of mains supply, if affected by the repair.
Test circuits according to Figure 2a to Figure 2f may be used.
The test circuits and limits in Table 1 shall be used. The EUT shall be disconnected from mains supply.
To include all insulation of all live parts, all switches, controls etc. shall be closed during the
meas
...
SLOVENSKI STANDARD
oSIST prEN 50678:2019
01-april-2019
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General procedure for verifying the effectiveness of the protective measures of electrical
equipment after repair
Ta slovenski standard je istoveten z: prEN 50678:2019
ICS:
17.220.20 0HUMHQMHHOHNWULþQLKLQ Measurement of electrical
PDJQHWQLKYHOLþLQ and magnetic quantities
oSIST prEN 50678:2019 en,fr,de
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
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oSIST prEN 50678:2019
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oSIST prEN 50678:2019
EUROPEAN STANDARD DRAFT
prEN 50678
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2019
ICS 17.220.20
English Version
General procedure for verifying the effectiveness of the
protective measures of electrical equipment after repair
To be completed To be completed
This draft European Standard is submitted to CENELEC members for enquiry.
Deadline for CENELEC: 2019-04-26.
It has been drawn up by CLC/TC 85X.
If this draft becomes a European Standard, 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.
This draft European Standard was established by CENELEC 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.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.
Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Project: 65081 Ref. No. prEN 50678 E
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CONTENTS
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 Requirements . 11
5 Tests . 11
5.1 General . 11
5.1.1 General test conditions . 11
5.1.2 Visual inspection . 12
5.1.3 Test of the protective measures against electric hazards . 12
5.1.4 Confirmation of the compliance of additional protective measures . 13
5.1.5 Documentation and evaluation of test . 13
5.2 Visual inspection . 13
5.3 Measuring of protective bonding resistance . 14
5.4 Measurement of the insulation resistance . 16
5.5 Measurement of protective conductor current . 24
5.6 Measurement of the touch current. 29
5.7 Confirmation of the compliance of the specifications for the protective measure
SELV/PELV . 35
5.8 Measurement of the leakage current produced by a floating input with a rated input
voltage above 50 V AC or 120 V DC . 35
5.9 Confirmation of the operation of further protective measures . 36
5.10 Confirmation of the polarity of mains plug wiring . 37
5.11 Functional test . 37
6 Documentation and evaluation of test . 37
7 Measuring equipment . 37
Annex A (informative) General guidance and rationale . 38
A.1 Intended audience . 38
A.2 Rationale . 39
Annex B (normative) Requirements for test instruments . 42
B.1 General . 42
B.2 Protective bonding resistance . 42
B.3 Insulation resistance . 42
B.4 Leakage current . 42
B.4.1 General . 42
B.4.2 Direct method . 42
B.4.3 Residual current test method . 43
B.4.4 Alternative method for leakage current . 43
Annex C (informative) Schematics for test sequences . 44
C.1 Schematic test sequence for equipment of protective class I . 44
C.2 Schematic test sequence for equipment of protective class II . 45
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Annex D (normative) Requirements for testing household and similar appliances in the scope
of standard series EN 60335 . 46
Bibliography . 47
Figures
Figure 1a — Example measuring circuit for the measurement of protective earth resistance in
equipment that is disconnected from the supply mains . 15
Figure 1b — Example measuring circuit for the measurement of protective earth resistance in
equipment, which for functional reasons cannot be disconnected from supply mains, or in
equipment or permanently connected to mains . 16
Figure 1 — Example measuring circuits for the measurement of protective earth resistance . 16
Figure 2a — Example measuring circuit for the measurement of insulation resistance –
equipment with protective earth connector and a plug . 18
Figure 2b — Example measuring circuit for the measurement of insulation resistance –
equipment with protective earth connector fixed installed and accessible conductive parts
not connected to protective earth . 19
Figure 2c — Example measuring circuit for the measurement of insulation resistance –
equipment with double insulation and a plug . 20
Figure 2d — Example measuring circuit for the measurement of insulation resistance –
equipment with SELV/PELV and a plug . 21
Figure 2e — Example measuring circuit for the measurement of insulation resistance –
equipment with protective earth connector and a plug and accessible conductive parts not
connected to protective earth . 22
Figure 2f — Example measuring circuit for the measurement of insulation resistance –
equipment with protective isolation transformers, verifying the safe insulation . 23
Figure 2 — Example measuring circuits for the measurement of insulation resistance . 23
Figure 3a — Example protective conductor current – direct method . 25
Figure 3b — Example protective conductor current – residual current method . 26
Figure 3c — Example protective conductor current – alternative method . 27
Figure 3d — Example protective conductor current – residual current method . 28
Figure 3e — Example protective conductor current – direct method with clamp . 29
Figure 3 — Example protective conductor current . 29
Figure 4a — Example touch current – residual current method . 31
Figure 4b — Example touch current – direct method . 32
Figure 4c — Example touch current – alternative method . 33
Figure 4d — Example touch current; direct method – on SELV/PELV connectors . 34
Figure 4 — Example touch current – different measuring methods . 34
Figure 5 — Example leakage current produced by a floating input with a rated input voltage . 36
Figure C.1 — Schematic test sequence for equipment of protective class I . 44
Figure C.2 — Schematic test sequence for equipment of protective class II . 45
Tables
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Table 1 — Limits (minimum values) for insulation resistance . 17
Table 2 — Limits (maximum values) for protective conductor current . 24
Table 3 — Limits (maximum values) for touch current . 30
Table A.1 — Addressees and their possible interest in this standard . 38
Table A.2 — Reasons for choosing different measuring methods for leakage current . 40
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1 European foreword
2 This document [prEN 50678:2019] has been prepared by CLC/TC 85X "Measuring equipment for
3 electrical and electromagnetic quantities".
4 This document is currently submitted to the Enquiry.
5 The following dates are proposed:
• latest date by which the existence of this (doa) dor + 6 months
document has to be announced at national
level
• latest date by which this document has to be (dop) dor + 12 months
implemented at national level by publication of
an identical national standard or by
endorsement
• latest date by which the national standards (dow) dor + 36 months
conflicting with this document have to be (to be confirmed or
withdrawn modified when voting)
6
5
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7 Introduction
8 This standard intends to provide a general test procedure to verify the effectiveness of the basic
9 protective measures for electrical equipment after it has been repaired, thus ensuring the safety of
10 people using repaired equipment.
11 This standard may be considered to support compliance with the European Directive 2009/104/EG
12 concerning the minimum safety and health requirements for the use of work equipment by workers at
13 work.
14 In general, the test procedure for verification of products after repair is the responsibility of the related
15 product technical committees. This document may be taken into consideration by product technical
16 committees if they need to take into consideration modified or additional tests for verification after
17 repairs for products falling within their scope.
18
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19 1 Scope
20 This document specifies requirements for setting a uniform procedure to verify the effectiveness of the
21 protective measures for current-using electrical equipment or appliances after they have been repaired.
22 This procedure is applicable to equipment or appliances that are pluggable equipment type A
23 connected to final circuits via a plug or permanently connected equipment, with a rated voltage above
24 25 V AC and 60 V DC up to 1 000 V AC and 1 500 V DC, and currents up to 63A.
25 This standard does not cover:
26 — type tests, routine tests and acceptance tests for product safety requirements and product
27 functional requirements.
28 NOTE Product safety requirements and product functional requirements are specified in the related product
29 standards.
30 This document assumes that the electrical equipment under consideration complies with its related
31 product standard, has been introduced on the market, has been in use, has failed, and has then been
32 repaired.
33 It intends to verify that operations for repairs have not jeopardized basic protective measures, for
34 example to verify the continuity of the protective conductor, the withstand capability of the insulation or
35 to verify that no metallic part is loose or is inadvertently inserted in the device.
36 This document does not apply to:
37 — devices and equipment that are part of the fix electrical installations. For these devices, tests for
38 verification after repair are covered by IEC 60364-6;
39 — audio/video, information and communication technology equipment;
40 — uninterruptible Power Supply (UPS);
41 — charging stations for electro-mobility;
42 — power supplies;
43 — programmable Logic Controllers (PLC);
44 — power Drives;
45 — devices for EX-zones or for mining applications in general;
46 – products already covered by standards addressing similar topics such as:
47 — medical equipment covered by IEC 60601-1. For these devices, tests for verification after
48 repair are covered by IEC 62353;
49 — arc welding equipment covered by IEC 60974-1. For these devices, tests for verification after
50 repair are covered by IEC 60974-4.
51 2 Normative references
52 The following documents are referred to in the text in such a way that some or all of their content
53 constitutes requirements of this document. For dated references, only the edition cited applies. For
54 undated references, the latest edition of the referenced document (including any amendments) applies.
55 EN 60335, Household and similar electrical appliances
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56 HD 60364-6, Low-voltage electrical installations — Part 6: Verification
57 EN 61010-1:2010, Safety requirements for electrical equipment for measurement, control and
58 laboratory use — Part 1: General requirements
59 EN 61010-2-030:2010, Safety requirements for electrical equipment for measurement, control, and
60 laboratory use — Part 2-030: Particular requirements for testing and measuring circuits
61 EN 61010-2-032, Safety requirements for electrical equipment for measurement, control, and
62 laboratory use — Part 2-032: Particular requirements for hand-held and hand-manipulated current
63 sensors for electrical test and measurement
64 EN 61557-2, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. —
65 Equipment for testing, measuring or monitoring of protective measures — Part 2: Insulation resistance
66 EN 61557-4, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. —
67 Equipment for testing, measuring or monitoring of protective measures — Part 4: Resistance of earth
68 connection and equipotential bonding
69 EN 61557-16, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c
70 — Equipment for testing, measuring or monitoring of protective measures — Part 16: Equipment for
71 testing the effectiveness of the protective measures of electrical equipment and/or medical electrical
72 equipment
73 EN 62353:2014, Medical electrical equipment — Recurrent test and test after repair of medical
74 electrical equipment
75 3 Terms and definitions
76 For the purposes of this document, the following terms and definitions apply.
77 ISO and IEC maintain terminological databases for use in standardization at the following addresses:
78 — IEC Electropedia: available at http://www.electropedia.org/
79 — ISO Online browsing platform: available at http://www.iso.org/obp
80 Note 1 to entry: Some of the definitions are different from those in the product standards for type testing, as
81 different measuring methods are used.
82 3.1
83 electrical safety
84 protection within an equipment which limits the effects of electrical current on a user or other
85 individuals
86 Note 1 to entry: Safety is defined as freedom from unacceptable risk (refer to ISO 14971:2007, definition
87 2.24).
88 3.2
89 testing
90 visual control, measure and prove the electrical equipment after repair to assure that equipment
91 remains safe to use
92 3.3
93 maintenance
94 combination of all technical and administrative means, including supervising means, to keep or restore
95 an equipment in working condition
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96 3.4
97 repair
98 means for restoration of the intended function of the equipment
99 3.5
100 (electrically) skilled person
101 person with relevant education and experience to enable him or her to perceive risks and to avoid
102 hazards which electricity can create
103 [SOURCE: IEC 60050-195:1998, 195-04-01]
104 3.6
105 (electrically) instructed person
106 person adequately advised or supervised by electrically skilled persons to enable him or her to
107 perceive risks and to avoid hazards which electricity can create
108 [SOURCE: IEC 60050-195:1998, 195-04-02]
109 3.7
110 electrical equipment
111 single apparatus using electrical energy and connected by plug or permanently connected to a final
112 circuit of the distribution system
113 Note 1 to entry: Equipment includes those accessories as defined by the manufacturer that are necessary to
114 enable the normal use of the equipment.
115 3.8
116 final circuit (of buildings)
117 electric circuit intended to supply directly electric current to current-using equipment or socket-outlets
118 [SOURCE: IEC 60050-826:2004, 826-14-03]
119 3.9
120 leakage current
121 current flowing from live parts of the equipment to earth
122 [SOURCE: IEC 60050-442:1998, 442-01-24 modified – the term has changed and a reference to the
123 absence of an insulation fault has been removed]
124 3.10
125 touch-current
126 electric current passing through a human body or through an animal body when it touches one or more
127 accessible parts of electrical equipment not connected to protective earth
128 [SOURCE: IEC 60050-195:1998, 195-05-21 modified – the wording of the definition has been
129 narrowed to electrical equipment not connected to protective earth]
130 3.11
131 protective conductor current
132 electric current which flows in a protective conductor and is frequency weighted according to the
133 characteristics of the human body
134 [SOURCE: IEC 60050-826:2004, 826-11-21, modified – the wording of the definition has been
135 expanded.]
136 3.12
137 residual current
138 vectorial sum of the currents flowing in the live conductors of the mains circuit of the equipment and
139 frequency weighted according to the characteristics of the human body
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140 [SOURCE: IEC 60050-442:1998, 442-05-19 modified – the wording of the definition has been
141 expanded]
142 3.13
143 insulation resistance
144 resistance under specified conditions between two conductive elements separated by insulating
145 materials
146 [SOURCE: IEC 60050-151:2001, 151-15-43]
147 3.14
148 protective bonding resistance
149 resistance between any accessible conductive part, which has to be connected for safety purposes to
150 the protective earth terminal, and the
151 — protective terminal of the mains plug, or
152 — protective terminal of the equipment inlet, or
153 — protective terminal permanently connected to the supply mains,
154 resistance between protective earth terminals at each end of a detachable power supply cord,
155 extension leads and multi-way adapters
156 3.15
157 SELV
158 electric system in which the voltage cannot exceed the value of extra-low voltage:
159 — under normal conditions and
160 — under single fault conditions, including earth faults in other electric circuits
161 Note 1 to entry: SELV is the abbreviation for safety extra-low voltage.
162 [SOURCE: IEC 60050-826:2004, 826-12-31]
163 3.16
164 PELV
165 electric system in which the voltage cannot exceed the value of extra-low voltage:
166 — under normal conditions and
167 — under single fault conditions, except earth faults in other electric circuits
168 Note 1 to entry: PELV is the abbreviation for protective extra-low voltage.
169 [SOURCE: IEC 60050-826:2004, 826-12-32]
170 3.17
171 permanently connected equipment
172 equipment that can only be electrically connected to or disconnected from the mains by the use of a
173 tool
174 3.18
175 pluggable equipment type A
176 equipment that is intended for connection to the mains via a non-industrial plug and socket outlet or
177 via a non-industrial appliance coupler, or both
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178 Note 1 to entry: Examples are plugs and socket-outlets covered by standards such as IEC/TR 60083 and
179 IEC 60320-1.
180 3.19
181 current-using equipment
182 electrical equipment intended to convert electrical energy into another form of energy, for
183 example light, heat, mechanical energy
184 [SOURCE: IEC 60050-826:2004, 826-16-02]
185 4 Requirements
186 Tests after repair shall only be performed by an electrically skilled person.
187 The qualification of the electrically instructed person shall include training on the subject and on the
188 test equipment. See 3.6.
189 Additional requirements (e.g. for the mechanical safety or for fire protection) according to the
190 requirements from the product safety standard shall be taken into account.
191 If testing the equipment requires additional knowledge or additional test and measurement equipment,
192 for example equipment for microwaves, tests shall be done according to the instructions of the
193 manufacturer.
194 All tests shall be performed in such a manner that the risk for testing personnel or other individuals
195 shall be reduced by appropriate protective measures.
196 If not otherwise stated, all values for current and voltage are the RMS values of an alternating, direct
197 or composite voltage or current.
198 The applicable tests as listed in Clause 5 shall be used to advise that:
199 — there are no visible faults on safety related parts, which are accessible by the user, and
200 — by the intended use of the equipment, no hazard for the user or the environment originates.
201 The electrically skilled person who is responsible for the test shall decide if additional tests are
202 required to meet the protective measures.
203 The electrically skilled person may decide that, for equipment that is connected to the distribution
204 system with fixed and protected wiring and is not intended to be hand-held during operation, the test is
205 carried out according to this standard and/or according to HD 60364-6.
206 The test procedure shall be interrupted and the equipment shall be disconnected from mains and
207 marked as failed, if it is found that during the test:
208 — reduced safety levels are present due to damage or from unintended use, and/or
209 — functional hazards could occur.
210 5 Tests
211 5.1 General
212 5.1.1 General test conditions
213 The tests may be performed at the ambient temperature, humidity and atmospheric pressure present
214 at the location of testing. The operational limits of the test equipment and the equipment under test
215 shall be taken into account.
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216
The equipment shall be tested according to the test steps in 5.1.2 to 5.1.5, as long as it is possible
217 with the equipment under test. The sequence of testing shall be as defined in this standard.
218 Each individual test shall be passed before proceeding to the next test.
219 If it is not possible to perform a certain test step, an electrically skilled person shall decide if the safety
220 of the equipment under test can be confirmed without the test step or by other means.
221 NOTE 1 Manufacturer’s instructions on tests to be performed after repair can be considered as other means.
222 The values in this standard shall be used unless the product standard specifically provides in-service
223 limits in which case the product standard limits shall be used.
224 NOTE 2 If external equipment is connected to the equipment under test, for example via data connectors,
225 measured values will be for the total system including the external equipment or accessories. If the external
226 equipment is disconnected from the mains but remains connected to the equipment under test, measurements
227 can still be influenced such that it is not possible to correctly access the safety of the equipment under test.
228 5.1.2 Visual inspection
229 Visual inspection shall be performed according to 5.2.
230 5.1.3 Test of the protective measures against electric hazards
231 Test of the protective measures against electric hazards shall be performed according to 5.3 to 5.8.
232 — Confirmation of the effectiveness of the protective bonding to all accessible conductive parts
233 connected for safety reasons to protective earth according to 5.3.
234 — Confirmation of the effectiveness of the insulation by measuring the insulation resistance between
235 live parts and accessible conduct
...
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