Recurrent Test of Electrical Equipment

This document specifies the requirements of the test procedures to be applied for recurrent tests of current-using electrical equipment and appliances for the verification of the effectiveness of the protective measures and the permissible limits for product compliance.
This procedure is applicable to current-using electrical equipment connected to final circuits. They can be either pluggable equipment type A connected to final circuits at work places 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 document does not cover:
—    Test after repair defined in FprEN 50678;
—    type tests, routine tests, sample tests, special tests and acceptance tests for product safety nor for product functional requirements.
This document does not apply to:
—    devices and equipment that are part of the fixed electrical installations defined in HD 60364 (all parts);
—    uninterruptible Power Supply (UPS), photovoltaic inverters and power converters, e.g. AC/DC converters;
—    charging stations for electro-mobility;
—    stationary power supplies (generators);
—    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, EN 62353 applies;
—    arc welding equipment covered by EN 60974 1. For these devices, EN 60974 4 applies;
—    Machinery covered by EN 60204 1. For these devices, EN 60204 1 applies.

Wiederholungsprüfung für elektrische Geräte

Dieses Dokument legt die Anforderungen an die Prüfverfahren fest, die anlässlich einer wiederkehrenden Prüfung elektrischer Verbrauchsmittel und Geräte zur Überprüfung der Wirksamkeit der Schutzmaßnahmen auf Einhaltung der zulässigen Grenzwerte anzuwenden sind. Dieses Verfahren gilt für elektrische Geräte, die am Arbeitsplatz an Endstromkreise mit einer Nennspannung von über 25 V AC und 60 V DC bis zu 1 000 V AC und 1 500 V DC und Strömen bis zu bis 63 A angeschlossen sind. Dies können Geräte sein, die am Endstromkreis am Arbeitsplatz mit einem Anschlussstecker des Typs A, oder fest angeschlossen sind. Diese Norm geht davon aus, dass die in Rede stehenden elektrischen Geräte bereits auf dem Markt und in Gebrauch sind und den jeweiligen Produktnormen entsprechen. Dieses Dokument deckt nicht ab - Prüfung nach der Reparatur definiert in EN 50678; - Typprüfung, Stückprüfung, Stichprobenprüfungen, Sonderprüfungen und Abnahmeprüfungen für die Produktsicherheit und für die Produktfunktionsanforderungen. ANMERKUNG 1 Typprüfungen, Stückprüfungen, Stichprobenprüfungen, Sonderprüfungen und Abnahmeprüfungen sind normalerweise in Produktnormen definiert. Dieses Dokument ersetzt keine Prüfungen, die unter Produktnormen fallen. Dieses Dokument gilt nicht für: - Geräte und Einrichtungen die Teil der elektrischen Anlagen nach HD 60364 (alle Teile) sind; ANMERKUNG 2 Für diese Geräte werden Installationsprüfungen und regelmäßige Überprüfungen durch HD 60364-6 abgedeckt. - Unterbrechungsfreie Stromversorgung (USV), Photovoltaik-Wechselrichter und Stromrichter, z. B. AC / DC-Wandler; - Ladestationen für Elektrofahrzeuge; - Speicherprogrammierbare Steuerungen; - Leistungsantriebe; - Geräte für den EX-Bereich oder für den Bergbau allgemein; - Geräte, für die andere Vorschriften für die Instandhaltung und/oder Überprüfung gelten wie z. B.: a) medizinische elektrische Geräte nach IEC 60601-1. Für diese Geräte gilt die EN 62353; b) Lichtbogenschweißgeräte nach IEC 60974-1. Für diese Geräte gilt die EN 60974-4; c) Maschinen nach EN 60204-1. Für diese Geräte gilt die EN 60204-1.

Essais récurrents des appareils électriques

Ponavljalni preskus električne opreme

General Information

Status
Published
Public Enquiry End Date
29-Feb-2020
Publication Date
29-Nov-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
27-Nov-2020
Due Date
01-Feb-2021
Completion Date
30-Nov-2020

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SLOVENSKI STANDARD
SIST EN 50699:2021
01-januar-2021
Ponavljalni preskus električne opreme
Recurrent Test of Electrical Equipment
Wiederholungsprüfung für elektrische Geräte
Essais récurrents des appareils électriques
Ta slovenski standard je istoveten z: EN 50699:2020
ICS:
29.020 Elektrotehnika na splošno Electrical engineering in
general
SIST EN 50699:2021 en

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

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SIST EN 50699:2021
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SIST EN 50699:2021
EUROPEAN STANDARD EN 50699
NORME EUROPÉENNE
EUROPÄISCHE NORM
November 2020
ICS 19.080; 29.020
English Version
Recurrent Test of Electrical Equipment

Essais récurrents des appareils électriques Wiederholungsprüfung für elektrische Geräte

This European Standard was approved by CENELEC on 2020-09-21. 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 50699:2020 E
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SIST EN 50699:2021
EN 50699:2020 (E)
Contents

European foreword ...................................................................................................................................3

Introduction ...............................................................................................................................................4

1 Scope ...............................................................................................................................................5

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

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

4 Requirements ...................................................................................................................................9

5 Tests .............................................................................................................................................. 10

5.1 General ................................................................................................................................ 10

5.1.1 General test conditions ................................................................................................ 10

5.1.2 Visual inspection ......................................................................................................... 10

5.1.3 Test of the effectiveness of protective measures against electric hazards ................. 10

5.1.4 Confirmation of the compliance of additional protective measures............................. 11

5.1.5 Documentation and evaluation of test ......................................................................... 11

5.2 Visual inspection .................................................................................................................. 11

5.3 Measuring of protective conductor resistance ..................................................................... 12

5.4 Measurement of the insulation resistance ........................................................................... 14

5.5 Measurement of protective conductor current ..................................................................... 18

5.6 Measurement of the touch current ...................................................................................... 22

5.7 Confirmation of the compliance of the specifications for the protective measure

SELV/PELV ......................................................................................................................... 25

5.8 Measurement of the leakage current produced by a floating input (measuring- and

control input) with a rated input voltage above 50 V AC or 120 V DC ................................ 26

5.9 Confirmation of the operation of further protective measures ............................................. 27

6 Documentation and evaluation of test ........................................................................................... 27

7 Test equipment .............................................................................................................................. 27

Annex A (informative) General guidance and rationale ....................................................................... 28

A.1 Intended audience ......................................................................................................................... 28

A.2 Rationale ....................................................................................................................................... 29

A.2.1 Clause 5 – Tests .................................................................................................................. 29

A.2.2 Subclause 5.3 – Measuring of protective bonding resistance ............................................. 29

A.2.3 Subclause 5.4 – Measurement of insulation resistance ...................................................... 29

A.2.4 Reasons for choosing different measuring methods for leakage current ............................ 30

A.2.5 Alternative method ............................................................................................................... 30

A.2.6 Residual method .................................................................................................................. 31

Annex B (informative) Schematics for test sequences ........................................................................ 32

B.1 Schematic test sequence for equipment of class I ........................................................................ 32

B.2 Schematic test sequence for equipment of class II ....................................................................... 33

Annex C (normative) Special National Conditions ............................................................................... 34

Bibliography ........................................................................................................................................... 35

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SIST EN 50699:2021
EN 50699:2020 (E)
European foreword

This document (EN 50699:2020) has been prepared by CLC/BTTF 160-1 “Recurrent Test of Electrical

Equipment”.
The following dates are fixed:
• latest date by which this document has (dop) 2021-09-21
to be implemented at national level by
publication of an identical national
standard or by endorsement
• latest date by which the national (dow) 2023-09-21
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.

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SIST EN 50699:2021
EN 50699:2020 (E)
Introduction

This document intends to provide a uniform test procedure to test the effectiveness of the protective

measures for electrical safety for recurrent tests of current-using equipment and appliances during

their operating life time at work places.

This document can be considered by employers to support compliance with the European Directive

2009/104/EC concerning the minimum safety and health requirements for the use of work equipment

by workers at work and does not necessarily involve the manufacturer.

In general, test procedures for verification of products is the responsibility of the related product

technical committees. This document can be taken into consideration by product technical committees

if they need to take into consideration modified or additional tests for verification of products falling

within their scope.”

The described tests are simple and fast, well approved and safe for the testing person.

They can be carried out on site and/or in laboratories.
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SIST EN 50699:2021
EN 50699:2020 (E)
1 Scope

This document specifies the requirements of the test procedures to be applied for recurrent tests of

current-using electrical equipment and appliances for the verification of the effectiveness of the

protective measures and the permissible limits

This procedure is applicable to current-using electrical equipment connected at work places to final

circuits 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. They can be either pluggable equipment type A connected to final circuits at work

places via a plug or permanently connected equipment.

This document assumes that the current-using equipment or appliances under consideration complies

with its related product standard, has been introduced on the market and is in use.

This document does not cover:
— tests after repair defined in EN 50678;

— type tests, routine tests, sample tests, special tests and acceptance tests for product safety nor

for product functional requirements.

NOTE 1 type tests, routine tests, sample tests, special tests and acceptance tests are usually defined in

product standards. This document does not replace tests covered by product standards.

This document does not apply to:

— devices and equipment that are part of the fixed electrical installations defined in

HD 60364 (all parts);

NOTE 2 For these devices, tests for initial and periodic verifications are covered by HD 60364-6.

— uninterruptible Power Supply (UPS), photovoltaic inverters and power converters, e.g. AC/DC

converters;
— charging stations for electro-mobility;
— stationary power supplies (generators);
— 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:

a) medical equipment covered by EN 60601-1. For these devices, EN 62353 applies;

b) arc welding equipment covered by EN 60974-1. For these devices, EN 60974-4 applies;

c) machinery covered by EN 60204-1. For these devices, EN 60204-1 applies.
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SIST EN 50699:2021
EN 50699:2020 (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.

EN 61557-1, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. -

Equipment for testing, measuring or monitoring of protective measures - Part 1: General requirements

EN 61557-2, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. -

Equipment for testing, measuring or monitoring of protective measures - Part 2: Insulation resistance

EN 61557-4, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. -

Equipment for testing, measuring or monitoring of protective measures - Part 4: Resistance of earth

connection and equipotential bonding

EN 61557-16, Electrical safety in low voltage distribution systems up to 1 000 V a.c. and 1 500 V d.c. -

Equipment for testing, measuring or monitoring of protective measures - Part 16: Equipment for testing

the effectiveness of the protective measures of electrical equipment and/or medical electrical

equipment
IEC 60417, Graphical symbols for use on equipment
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 https://www.iso.org/obp

NOTE Some of the definitions are different from those in the product standards for type testing, as different

measuring methods are used.
3.1
electrical safety

protection within a piece of 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

process of visually controlling, measuring or proving the electrical equipment in order to assure that

equipment remains safe to use
3.3
electrically skilled person
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: IEV 195-04-01]
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SIST EN 50699:2021
EN 50699:2020 (E)
3.4
electrically instructed person
instructed person

person adequately advised or supervised by electrically skilled persons to enable him or her to

perceive risks and to avoid hazards which electricity can create
[SOURCE: IEV, 195-04-02]
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.
3.6
final circuit

electric circuit intended to directly supply electric current to current-using equipment or socket-outlets

[SOURCE: IEV 826-14-03 modified, buildings is removed]
3.7
leakage current
current flowing from live parts of the equipment to earth

[SOURCE: IEV 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

current passing through a human or animal body when it touches one or more accessible parts of a

piece of electrical equipment not connected to protective earth

[SOURCE: IEV 195-05-21 modified – the wording of the definition has been narrowed]

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: IEV 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: IEV 826-11-19 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: IEV 151-15-43]
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SIST EN 50699:2021
EN 50699:2020 (E)
3.12
protective bonding resistance

resistance between any accessible conductive part, which is 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;
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: IEV 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: IEV 826-12-32]
3.15
recurrent test

periodic verification of the effectiveness of protective measures of electrical equipment

3.16
permanently connected equipment

equipment that can only be electrically connected to or disconnected from the mains by the use of a

tool
3.17
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 appliance couplers covered by standards such as EN 60320-1.

3.18
current-using equipment

electrical equipment intended to convert electrical energy into another form of energy, for example

light, heat, mechanical energy
[SOURCE: IEC 60050-826:2004, 826-16-02]
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SIST EN 50699:2021
EN 50699:2020 (E)
3.19
hazardous live parts
live part which, under certain conditions, can give a harmful electric shock
[SOURCE: IEC 60050-826:2004, 826-12-13]
4 Requirements

Recurrent tests shall be performed by an electrically skilled person or by an electrically instructed

person, supervised 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 may be

taken into account.

If it is not possible to perform a certain test step, an electrically skilled person shall decide if the safety

of the equipment under test can be confirmed without the test step or by other means. This decision

shall be justified and reported.

If testing the equipment requires additional knowledge or additional 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 r.m.s. 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, minimized 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.

During a recurrent test the equipment shall not be disassembled. 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 document

and/or according to the relevant clauses of 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.

NOTE The frequency of testing can be determined by the national requirements or recommendation of the

manufacturer. Where no national requirements or information of the manufacturer is existing a risk analysis can

be used.
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SIST EN 50699:2021
EN 50699:2020 (E)
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.

If it is obvious that the equipment is contaminated by dust or moisture, it is allowed to clean the

equipment under test and/or to allow it to dry before starting the tests

The operational limits of the test equipment and the equipment under test shall be taken into account.

The equipment shall be tested according to the test steps in 5.1.1 to 5.1.5, as long as it is possible

with the equipment under test. The sequence of testing shall be as defined in this document.

Each individual performed 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 equipment under test can be confirmed without the test step or by other means. This decision

shall be justified and reported.
Manufacturer’s instructions on tests to be performed, shall be considered.

The values in this document shall be used unless the product standard specifically provides in-service

limits in which case the product standard limits shall be used or justified values from the manufacturer.

External equipment that could influence the tests should be disconnected, if possible.

Measurement of leakage currents using the direct or residual method shall be performed using a TN

supply system or a TT supply system with an earth resistance below 1000 Ω.

NOTE 1 It is preferable to use a TN supply for the measurement of leakage currents using the direct or

residual method.

Accessible conductive parts not relevant for touch current measurement can be identified by risk

analysis. Risk assessment and risk analysis should be carried out by skilled persons and should be

based on knowledge of the electrical circuitry and construction of the Equipment Under Test (EUT).

NOTE 2 In general this document does not address the measurement of DC leakage currents.

5.1.2 Visual inspection
Visual inspection shall be performed according to 5.2.
5.1.3 Test of the effectiveness of 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.
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SIST EN 50699:2021
EN 50699:2020 (E)

— 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 The measurement of protective earth leakage current can be omitted on permanently connected

(installed) equipment.

— 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 (e.g. inputs for measuring and control) with a rated input voltage above 50 V AC or

120 V DC according to 5.8.
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.

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 applicable):
— any damage or contamination;
— that all cables and connectors are connected in their intended way ;

— checking by hand to ensure that the anchorages and the inlets of each connector are properly

fixed.
— 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 cord grip;
— condition of anchorage, cable clip, accessible fuse insert;

— damage of the housing and protective cover that could give access to live or dangerous moving

parts;
— signs of overload or overheating or unintended use;
— signs of improper change;
— signs of corrosion that impacts protective measures and improper aging;
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SIST EN 50699:2021
EN 50699:2020 (E)
— blockage of cooling inlets and outlets e.g. air filters ;

— tightness of container for water, air, or other medium, condition of pressure control valve;

— usability of switches, control and setup equipment;

— readability and completeness of all safety relevant markings, labels 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) ;

— assess the relevant accessories together with the equipment (e.g. detachable or fixed power

supply cords tubing);
— defect due to bending of cords, cables, hoses and tubing.

NOTE 1 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.
NOTE 2 This list is not exhaustive
5.3 Measuring of protective conductor resistance
The integrity of the protective conductor connections shall be confirmed by:

— visually inspecting the entire length of the protective earth path, according to 5.2;

— measuring the resistance between the protective earth terminal of the equipment (where

applicable contact on the mains plug) and each accessible conductive part, directly connected to

the protective earth.

NOTE 1 Conductive parts, which are not part of the protective measures, could have a higher measured

resistance values (e.g. mechanical construction parts, decorative parts, functional earthing, etc.). On these parts,

touch current measurements are used.

NOTE 2 During the measurement, the conductor is flexing over the entire length and at the point of entry on

the equipment and the mains plug. Flexing is not required for permanently connected equipment where the

conductor is not accessible.
Test circuits according to Figure 1a or Figure 1b may be used.

The protective bonding resistance shall not exceed 0,3 Ω for equipment under test with cable lengths

up to 5 m and a cross section area up to 1,5 mm . For each further 7,5 m of cable length 0,1 Ω shall

be added up to a maximum limit value of 1 Ω.

For cross section areas above 1,5 mm2 and other cable lengths the limit shall be calculated by the

following formula.
R=ρΩ+=01,,or R + 01Ω
AAκ
where
R is the electrical resistance (Ω);

ρ (Roh) is the standard value of electrical conductivity (Ω mm2/m) for the metal used for the PE

conductor;
l is the length of the cable in meters (m);
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SIST EN 50699:2021
EN 50699:2020 (E)
A is the cross-sectional area of the conductor in square millimetres (mm2);
κ is the electrical conductivity (S/m).

NOTE 3 The value of 0,1 Ω in the formulae above takes into account the influence of the contact resistance.

If fixed installed equipment is measured using an adjacent connection, an electrically skilled person

shall decide which value shall be added.

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 under test 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 4 During this measurement parallel earth connections, for example due to the type of installation (water

pipe or data line), can influence the result.

NOTE 5 Some equipment under test could 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.

a) Example of test circuit for the measurement of protective ea
...

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