IEC 62852:2014

Connectors for DC-application in photovoltaic systems - Safety requirements and tests

IEC 62852:2014 applies to connectors for use in the d.c. circuits of photovoltaic systems according to class II of IEC 61140:2001 with rated voltages up to 1 500 V d.c. and rated currents up to 125 A per contact. It applies to connectors without breaking capacity but which might be engaged and disengaged under voltage.

Connecteurs pour applications en courant continu pour systèmes photovoltaïques - Exigences de sécurité et essais

L'IEC 62852:2014 s'applique aux connecteurs utilisés dans les circuits à courant continu des systèmes photovoltaïques selon la classe II de l'IEC 61140:2001 de tension assignée allant jusqu'à 1 500 V en courant continu et de courant assigné allant jusqu'à 125 A par contact. Elle s'applique à des connecteurs sans pouvoir de coupure mais qui peuvent être branchés et débranchés sous tension.

General Information

• Status: Published
• Publication Date: 24-Mar-2020
• ICS: 27.160 - Solar energy engineering
• Technical Committee: TC 82 - Solar photovoltaic energy systems
• Drafting Committee: WG 2 - TC 82/WG 2
• Current Stage: PPUB - Publication issued
• Start Date: 06-Nov-2014
• Completion Date: 30-Nov-2014

Relations

• Amended By: IEC 62852:2014/AMD1:2020 - Amendment 1 - Connectors for DC-application in photovoltaic systems - Safety requirements and tests
• Effective Date: 05-Sep-2023

Overview

IEC 62852:2014, developed by the International Electrotechnical Commission (IEC), specifies safety requirements and test methods for connectors used in the direct current (DC) circuits of photovoltaic (PV) systems. This standard covers connectors with rated voltages up to 1,500 V DC and rated currents up to 125 A per contact. It is applicable to connectors without breaking capacity, which may be engaged and disengaged under voltage, and is designed to ensure safety, reliability, and performance in solar energy applications.

Key Topics

• Scope and Classification
  IEC 62852 covers connectors intended for use in class II photovoltaic systems, as defined in IEC 61140:2001. The standard distinguishes between different types of connectors, such as free connectors, built-in connectors, and integrated connectors, and considers additional features like cable anchorage, IP codes (Ingress Protection), and rewiring capability.

• Constructional Requirements
  Connectors must be suitable for outdoor use and withstand ambient temperatures ranging from -40°C to +85°C. Key constructional aspects include:

  • Marking and identification requirements
  • Provisions to prevent incorrect mating
  • Electric shock protection measures
  • Durable terminations and connection methods
  • Mechanical and electrical durability specifications

• Performance Criteria
  The standard outlines minimum requirements for:

  • Degree of protection (IP code) against dust and moisture
  • Dielectric strength and insulation properties
  • Mechanical strength and resistance to environmental deterioration
  • Temperature rise, cable anchorage, and torque values for connections
  • Durability of marking and prevention of accidental disconnection

• Testing Methods
  To ensure compliance, IEC 62852 mandates a series of rigorous tests, including:

  • Mechanical operation and bending (flex) tests
  • Dielectric and impulse voltage tests
  • Resistance to corrosion, extreme temperatures, and damp heat
  • Pull and torsion force tests for cable anchorage and connectors with/without locking devices
  • Measurement of clearances and creepage distances

Applications

• Solar Photovoltaic Installations
  IEC 62852 is essential for manufacturers of PV connectors-and for engineers designing and installing solar power plants. Use of compliant connectors helps ensure long-term safety, reliability, and electrical performance in PV modules and DC string wiring.

• Device Integration
  The standard applies to connectors built into enclosures or devices within PV systems, extending its relevance to junction boxes, inverters, combiner boxes, and other DC circuit components commonly found in solar installations.

• Compliance and Certification
  Adoption of IEC 62852 is key for industry compliance and certification processes, enabling products to meet international safety requirements and facilitating access to global markets.

Related Standards

• IEC 61140:2001 – Protection against electric shock in electrical installations.
• IEC 60529 – Degrees of protection provided by enclosures (IP Code).
• IEC 61984 – Safety requirements and tests for connectors.
• IEC 60364-7-712 – Requirements for PV power supply systems.
• IEC 61215 – Qualification and type approval for PV modules.
• IEC 62930 – Electric cables for PV systems.
• IEC 62548 – Design requirements for PV arrays.

Summary

IEC 62852:2014 delivers a comprehensive framework for ensuring the safe design, performance, and testing of connectors in DC circuits of photovoltaic systems. By following this international standard, manufacturers, installers, and system integrators can guarantee the safety, durability, and reliability of PV connectors under real-world operating conditions. This is vital to the long-term performance, maintenance, and safety compliance of solar energy infrastructure worldwide.

Keywords: IEC 62852, PV connector standard, DC connector, photovoltaic connector, solar energy, safety requirements, connector testing, renewable energy compliance, IP code, electric shock protection, solar installation standards.

Standards Content (Sample)

IEC 62852 ®
Edition 1.0 2014-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for DC-application in photovoltaic systems – Safety requirements
and tests
Connecteurs pour applications en courant continu pour systèmes
photovoltaïques – Exigences de sécurité et essais
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IEC 62852 ®
Edition 1.0 2014-11
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Connectors for DC-application in photovoltaic systems – Safety requirements

and tests
Connecteurs pour applications en courant continu pour systèmes

photovoltaïques – Exigences de sécurité et essais

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 27.160 ISBN 978-2-8322-1898-3

– 2 – IEC 62852:2014 © IEC 2014
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Classification . 12
4.1 General . 12
4.2 Type of connector . 12
4.3 Additional characteristics . 12
5 Constructional requirements and performance . 13
5.1 General . 13
5.2 Marking and identification . 13
5.2.1 Identification . 13
5.2.2 Marking . 13
5.2.3 Technical documentation . 13
5.3 Provision against incorrect mating (non-intermateable) . 14
5.4 Protection against electric shock . 14
5.5 Terminations and connection methods . 14
5.6 Resistance to deterioration . 15
5.7 General design . 15
5.8 Design of a free connector . 15
5.9 Degree of protection (IP Code) . 16
5.10 Dielectric strength . 16
5.11 Mechanical and electrical durability . 16
5.12 Range of ambient temperature . 16
5.13 Temperature rise . 16
5.14 Cable anchorage . 16
5.15 Mechanical strength . 17
5.16 Connector without locking device . 17
5.17 Connector with locking device . 17
5.18 Clearances and creepage distances . 17
5.18.1 General . 17
5.18.2 Clearances . 18
5.18.3 Creepage distances . 18
5.19 Insulation parts . 20
5.19.1 General . 20
5.19.2 Outer accessible parts . 20
5.19.3 Inner parts . 20
5.20 Current carrying parts and resistance against corrosion . 20
6 Tests . 20
6.1 General . 20
6.2 Preparation of specimens . 21
6.3 Performance of tests . 22
6.3.1 General . 22
6.3.2 Durability of marking . 23
6.3.3 Protection against electric shock . 23
6.3.4 Temperature rise . 23

6.3.5 Mechanical operation . 23
6.3.6 Bending (flexing) test (see IEC 60309-1:1999, 24.4) . 24
6.3.7 Measurement of clearances and creepage distances . 25
6.3.8 Dielectric strength . 25
6.3.9 Corrosion test . 26
6.3.10 Mechanical strength at lower temperatures . 26
6.3.11 Change of temperature (IEC 60068-2-14 test Na) . 26
6.3.12 Damp heat test . 26
6.3.13 Insertion and withdrawal force . 27
6.3.14 Effectiveness of connector coupling device . 27
6.3.15 Terminations and connecting methods . 27
6.4 Test schedule (routine test) for non-rewirable free connectors . 28
6.5 Test schedule . 28
Annex A (informative) Warning symbols used on connectors . 35
Annex B (normative) Measurement of clearances and creepage distances . 36
Bibliography . 40

Figure 1 – Device for the bending test. 25
Figure A.1 – Symbol "DO NOT DISCONNECT UNDER LOAD" . 35
Figure A.2 – Symbol "DO NOT DISCONNECT UNDER LOAD” (IEC 60417-6070) . 35
Figure B.1– Examples of methods of measuring clearances and creepage distances . 39

Table 1 – Values for cable anchorage testing . 17
Table 2 – Rated impulse voltages and minimum clearances . 18
Table 3 – Creepage distances for basic insulation. . 19
Table 4 – Plan of specimens required for tests . 21
Table 5 – Values of torque for screw-type clamping units . 22
Table 6 – Mechanical test group A (test group A are separate tests) . 28
Table 7 – Service life test group B . 29
Table 8 – Service life test group C . 30
Table 9 – Thermal test group D (mated test specimen) . 31
Table 10 – Climatic test group E (mated test specimen) . 32
Table 11 – Degree of protection, test group F . 33
Table 12 – Insulation material, test group G . 34
Table B.1 – Dimensions of X . 36

– 4 – IEC 62852:2014 © IEC 2014
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONNECTORS FOR DC-APPLICATION IN PHOTOVOLTAIC SYSTEMS –
SAFETY REQUIREMENTS AND TESTS
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
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Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any
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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
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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 62852 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
This International Standard is derived from EN 50521.
The text of this standard is based on the following documents:
FDIS Report on voting
82/878/FDIS 82/905/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.

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.
– 6 – IEC 62852:2014 © IEC 2014
CONNECTORS FOR DC-APPLICATION IN PHOTOVOLTAIC SYSTEMS –
SAFETY REQUIREMENTS AND TESTS
1 Scope
This International Standard applies to connectors for use in the d.c. circuits of photovoltaic
systems according to class II of IEC 61140:2001 with rated voltages up to 1 500 V d.c. and
rated currents up to 125 A per contact.
This standard applies to connectors without breaking capacity but which might be engaged
and disengaged under voltage.
This standard also applies to connectors which are intended to be built-in or integrated in
enclosures of devices for photovoltaic systems. This standard may be used as a guide for
connectors in photovoltaic systems of classes 0 and III according to IEC 61140:2001 as well
as for protection for Class II equipment intended for use at less than 50 V d.c.
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 (all parts): International Electrotechnical Vocabulary (available at
http://www.electropedia.org)
IEC 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test
requirements
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
IEC 60068-2-14:2009, Environmental testing – Part 2-14: Tests – Test N: Change of
temperature
IEC 60068-2-75:1997, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60068-2-78:2012, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat,
steady state
IEC 60228:2004, Conductors of insulated cables
IEC 60309-1:1999, Plugs, socket-outlets and couplers for industrial purposes – Part 1:
General requirements
IEC 60352-2:2006, Solderless connections – Part 2: Solderless crimped connections –
General requirements, test methods and practical guidance
IEC 60352-3:1993, Solderless connections – Part 3: Solderless accessible insulation
displacement connections – General requirements, test methods and practical guidance

IEC 60352-4:1994, Solderless connections – Part 4: Solderless non-accessible insulation
displacement connections – General requirements, test methods and practical guidance
IEC 60352-5:2012, Solderless connections – Part 5: Press-in connections – General
requirements, test methods and practical guidance
IEC 60352-6:1997, Solderless connections – Part 6: Insulation piercing connections – General
requirements, test methods and practical guidance
IEC 60352-7:2002, Solderless connections – Part 7: Spring clamp connections – General
requirements, test methods and practical guidance
IEC 60364-7-712:2002, Electrical installations of buildings – Part 7-712: Requirements for
special installations or locations – Solar photovoltaic (PV) power supply systems
IEC 60512 (all parts), Connectors for electronic equipment – Tests and measurements
IEC 60512-1:2001, Connectors for electronic equipment – Tests and measurements – Part 1:
General
IEC 60512-11-7:2003, Electromechanical components for electronic equipment – Basic testing
procedures and measuring methods – Part 11-7: Climatic tests – Test 11g: Flowing mixed gas
corrosion test
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60664-1:2007, Insulation coordination for equipment within low voltage systems – Part 1:
Principles, requirements and tests
IEC 60695-2-11:2014, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods -
Glow-wire flammability test method for end-products (GWEPT)
IEC 60695-11-10:2013, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
IEC TR 60943:1998, Guidance concerning the permissible temperature rise for parts of
electrical equipment, in particular for terminals
IEC 60998-2-3:2002, Connecting devices for low-voltage circuits for household and similar
purposes – Part 2-3: Particular requirements for connecting devices as separate entities with
insulation-piercing clamping units
IEC 60999-1:1999, Connecting devices – Electrical copper conductors – Safety requirements
for screw-type and screwless-type clamping units – Part 1: General requirements and
2 2
particular requirements for clamping units for conductors from 0,2 mm up to 35 mm
(included)
IEC 60999-2:2003, Connecting devices – Electrical copper conductors – Safety requirements
for screw-type and screwless-type clamping units – Part 2: Particular requirements for
2 2
clamping units for conductors above 35 mm up to 300 mm (included)
IEC 61032:1997, Protection of persons and equipment by enclosures – Probes for verification
IEC 61140:2001, Protection against electric shock – Common aspects for installation and
equipment
– 8 – IEC 62852:2014 © IEC 2014
IEC 61210: 2010, Connecting devices – Flat quick-connect terminations for electrical copper
conductors –Safety requirements
IEC 61215:2005, Crystalline silicon terrestrial photovoltaic (PV) modules – Design
qualification and type approval
IEC 61984:2008, Connectors – Safety requirements and tests
IEC 62444:2010, Cable glands for electrical installations
IEC TS 62548, Photovoltaic (PV) arrays – Design requirements
ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc
sources
ISO 4892-3, Plastics – Methods of exposure to laboratory light sources – Part 3: Fluorescent
UV-lamps
ISO 6988:1985, Metallic and other non organic coatings – Sulfur dioxide test with general
condensation of moisture
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-581,
IEC 60050-826, IEC 60309-1, IEC 60664-1, IEC 60999-1 and IEC 61140, as well as the
following apply.
3.1
connector
component which terminates conductors for the purpose of providing connection to and
disconnection from a suitable mating component
[SOURCE: IEC 60050-581:2008, 581-06-01]
3.2
multi-way connector
connector with more than one contact
Note 1 to entry: Multiple single-way connectors used in a PV-junction box are not to be regarded as a multi-way
connector according to this standard.
3.3
connector under voltage
CuV
connector specially designed to be engaged or disengaged in normal use when live but not
under load
Note 1 to entry: In this standard, the term "live" is used if contacts are under an applied voltage, but not
necessarily carrying current. The term "load" is used if a current is flowing through the contacts.
3.4
connector without breaking capacity
COC
connector which is not allowed to be engaged or disengaged in normal use when live or under
load
[SOURCE: IEC 60050-581:2008, 581-27-73]

3.5
type of connector
3.5.1
free connector
connector for attachment to the free end of a wire or cable
[SOURCE: IEC 60050-581:2008, 581-06-12]
3.5.2
built-in connector
a pre-manufactured connector that is subsequently integrated into an enclosure
3.5.3
integrated connector
a connector assembly that is manufactured as an integral component during enclosure
fabrication
3.6
non-rewirable connector
connector so constructed that the cable cannot be separated from the connector without
making it permanently useless
[SOURCE: IEC 60309-1:1999, 2.5, modified]
3.7
connector for Class II equipment
connector in which the protection against indirect contact is realised by double or reinforced
insulation
Note 1 to entry: Class II according to IEC 61140.
3.8
intended use
application conditions of connectors which are included within the permissible rated values
and environmental conditions and characteristics assigned by the manufacturer
3.9
interlock
device, either electrical or mechanical, which prevents the contacts of a connector from
becoming live before it is in proper engagement with its counterpart, and which either
prevents the connector from being withdrawn while its contacts are live or makes the contacts
dead before separation
[SOURCE: IEC 60309-1:1999, 2.9, modified]
3.10
cycle of mechanical operation
one insertion and one withdrawal of the connector with his counterpart
3.11
clamping unit
part(s) of the terminal necessary for the mechanical clamping and the electrical connection of
the conductor(s), including the parts which are necessary to ensure the correct contact
pressure
[SOURCE: IEC 60999-1:1999, 3.1]

– 10 – IEC 62852:2014 © IEC 2014
3.12
upper limiting temperature
maximum temperature of a connector as defined by the manufacturer, in which the connector
is intended to operate
Note 1 to entry: The abbreviation ULT is often used.
3.13
ambient temperature
maximum temperature of the ambient assigned from the manufacturer, in which the connector
is able to operate permanently without the upper limiting temperature being exceeded
3.14
lower limiting temperature
minimum temperature of a connector as defined by the manufacturer in which a connector is
intended to operate
Note 1 to entry: The abbreviation LLT is often used.
3.15
clearance
the shortest distance in air between two conductive parts
[SOURCE: IEC 60664-1:2007, 1.3.2]
3.16
creepage distance
shortest distance along the surface of the insulating material between two conductive parts
[SOURCE: IEC 60664-1:2007, 1.3.3]
3.17
overvoltage category
numeral defining a transient overvoltage condition
[SOURCE: IEC 60664-1:2007, 1.3.10]
3.18
pollution
any addition of foreign matter, solid, liquid, or gaseous, that can result in a reduction of
electric strength or surface resistivity of the insulation
[SOURCE: IEC 60664-1:2007, 1.3.11]
3.19
pollution degree
numeral characterising the expected pollution of the micro-environment
[SOURCE: IEC 60664-1:2007, 1.3.13]
3.20
rated voltage
value of voltage assigned by the manufacturer to the connector and to which operation and
performance characteristics are referred
Note 1 to entry: Rated voltage is equivalent to the rated system voltage according to IEC 61730-1.
[SOURCE: IEC 60664-1:2007, 1.3.9, modified]

3.21
rated insulation voltage
r.m.s. withstand voltage value assigned by the manufacturer to the connector, characterising
the specified (long term) withstand capability of its insulation
Note 1 to entry: The rated insulation voltage is not necessarily equal to the rated voltage, which is primarily
related to functional performance.
[SOURCE: IEC 60664-1:2007, 1.3.9.1, modified]
3.22
rated impulse voltage
impulse withstand voltage value assigned by the manufacturer to the connector,
characterising the specified withstand capability of its insulation against transient
overvoltages
[SOURCE: IEC 60664-1:2007, 1.3.9.2, modified]
3.23
impulse withstand voltage
highest peak value of impulse voltage, of prescribed form and polarity which does not cause
breakdown of the insulation under specified conditions
Note 1 to entry: The impulse withstand voltage is equal to or higher than the rated impulse voltage.
[SOURCE: IEC 60664-1:2007, 1.3.8.1]
3.24
r.m.s. withstand voltage
power-frequency withstand voltage
highest r.m.s. value of a voltage which does not cause breakdown of the insulation under
specified conditions
[SOURCE: IEC 60664-1:2007, 1.3.8.2]
3.25
rated current
current value assigned by the manufacturer, which the connector can carry continuously
(without interruption) and simultaneously through all its contacts wired with the largest
specified conductor, preferably at an ambient temperature of 85 °C, without the upper limiting
temperature being exceeded
Note 1 to entry:If other ambient temperature values are used for the definition of the rated current, the
manufacturer should state in the technical documentation the ambient temperature on which the rating is based,
with reference, if appropriate, to the derating curve defined in IEC 60512-5-2, test 5b.
3.26
functional insulation
insulation between conductive parts which is necessary only for the proper functioning of the
equipment
[SOURCE: IEC 60664-1:2007, 1.3.17.1]
3.27
basic insulation
insulation applied to live parts to provide basic protection against electric shock
Note 1 to entry: Basic insulation does not necessarily include insulation used exclusively for functional purposes
(see IEC 61140:2001, 3.10.1).
– 12 – IEC 62852:2014 © IEC 2014
[SOURCE: IEC 60664-1:2007, 1.3.17.2]
3.28
supplementary insulation
independent insulation applied in addition to basic insulation, in order to provide protection
against electric shock in the event of a failure of basic insulation (see IEC 61140:2001,
3.10.2)
[SOURCE: IEC 60664-1:2007, 1.3.17.3]
3.29
double insulation
insulation comprising both basic insulation and supplementary insulation (see
IEC 61140:2001, 3.10.3)
[SOURCE: IEC 60664-1:2007, 1.3.17.4]
3.30
reinforced insulation
single insulation system applied to live parts, which provides a degree of protection against
electric shock equivalent to double insulation under the conditions specified in the relevant
IEC standard (see IEC 61140:2001, 3.10.4)
Note 1 to entry: A single insulation system does not imply that the insulation is a homogeneous piece. It may
comprise several layers which cannot be tested separately as basic or supplementary insulation.
[SOURCE: IEC 60664-1:2007, 1.3.17.5]
3.31
internal insulation
part of basic insulation providing the required clearance and creepage distances inside a
conductive housing or enclosure
4 Classification
4.1 General
In order to apply the relevant test requirements, connectors shall be classified by the
manufacturer’s specification, according to their intended use under consideration of class II,
according to IEC 61140 and characteristics, as set out below.
4.2 Type of connector
a) Free connector.
b) Built-in connector.
c) Integrated connector.
4.3 Additional characteristics
a) Connector with cable anchorage.
b) IP-code of a connector according to IEC 60529.
c) Connector for Class II equipment.
d) Non-rewirable connector.
e) Rewirable connector.
f) Terminations and connection methods.

5 Constructional requirements and performance
5.1 General
This standard does not define electrical rating values for voltage and current. These values
are assigned by the manufacturer.
Connectors shall be suitable for durable outdoor use in an ambient temperature area from
–40 °C to +85 °C.
Multi-way connectors shall be designed so that these requirements for earth-faulted and
short-circuit-proofed installation complies with IEC TS 62548 or IEC 60364-7-712.
Compliance with the requirements is verified by the specified tests of this standard.
5.2 Marking and identification
5.2.1 Identification
Connectors shall be identified and characterised by the following:
a) manufacturer’s name, trademark or mark of origin;
b) type reference (for example, the catalogue number);
c) rated current in amperes (A);
d) rated voltages or rated insulation voltages between line to earth and line to line in volts
(V);
e) rated impulse voltage in kilovolts (kV), if specified;
f) pollution degree;
g) degree of protection by enclosure according to IEC 60529;
h) range of temperature (ULT and LLT, maximum ambient temperature);
i) type of terminals;
j) connectable conductors;
NOTE For current capacity of cables and wires, see IEC 60364-5-52.
k) reference to this standard or to the Detail Specification (DS), if applicable;
l) symbols „Do not disconnect under load“, as given in Annex A; alternatively an adequate
warning notice can be found in particular national language;
m) polarity of connector, if applicable.
5.2.2 Marking
The marking shall be indelible and easily legible.
The minimum marking on the connector shall be that of item a), l) and m) in 5.2.1.
Symbol or warning notice listed in I) of 5.2.1 shall be imprinted or labelled close to connector.
A notice to attach the label shall be given in technical documentation.
Markings a) and b) of 5.2.1 shall be applied on the smallest package unit.
5.2.3 Technical documentation
Identification items of 5.2.1 not marked on the connector according to 5.2.2 and the following
information shall be given in the technical documentation of the manufacturer:

– 14 – IEC 62852:2014 © IEC 2014
a) information regarding the type of cable suitable for termination, if applicable;
b) information regarding mounting, if applicable;
c) assembly information such as required tooling (part number) by manufacturer, if
applicable.
5.3 Provision against incorrect mating (non-intermateable)
A multi-way connector shall be so designed that contact between live contacts of different
polarity is not possible by engagement.
Compliance shall be tested by performing a polarisation test (see A3 of Table 6).
5.4 Protection against electric shock
5.4.1 A connector shall be so designed that, after mounting, its live parts are not accessible
by the IEC test finger in accordance with IEC 60529.
5.4.2 Protection against electric shock shall be ensured also during insertion and
withdrawal. Compliance shall be tested by the IEC test probe 11 in accordance with
IEC 61032.
5.5 Terminations and connection methods
This standard applies to the following terminations and connection methods:
a) crimped connections according to IEC 60352-2
b) insulation displacement connections according to IEC 60352-3 (accessible IDC) or
IEC 60998-2-3
c) insulation displacement connections according to IEC 60352-4 (non-accessible
IDC) or IEC 60998-2-3
d) press-in connections according to IEC 60352-5
e) insulation piercing connections according to IEC 60352-6 or IEC 60998-2-3
f) screwless-type clamping units according to IEC 60999-1 or IEC 60999-2
or IEC 60352-7
g) screw-type clamping units according to IEC 60999-1 or IEC 60999-2
h) flat, quick-connect terminations according to IEC 61210
As a minimum the applicable tests according to 6.3.15 shall be performed for all terminations
and connection methods intended to be used.
Other terminations and connection methods shall be tested in accordance with the relevant
standards.
Soldering and welding connections are also permitted.
Termination and connection methods shall provide sufficient means for retaining the
conductor in position.
Electrical connections shall be so designed that the contact pressure is not transmitted
through insulating material other than ceramic, pure mica or other material with characteristics
not less suitable, unless there is sufficient resiliency in the metallic parts to compensate for
any shrinkage or yielding of the insulating material (see IEC 60309-1:1999, 25.3 or
IEC 60999-1:1999, Clause 7 or IEC 60999-2). Insulation piercing terminations and insulation
displacement connections are excluded from this requirement because of the tests performed
according to IEC 60352-6 or IEC 60998-2-3.

Precautions shall be taken to ensure that adequate contact pressure is maintained during
connector lifetime.
To compensate for changes during use, (e.g. loosening at screw-type clamping units caused
by thermal cycles) the use of a lock washer, spring washer or similar could be sufficient.
All terminations and connection methods shall be protected from mechanical and excessive
thermal stress which could cause increased contact resistance.
5.6 Resistance to deterioration
If deterioration of specific parts might impair safety, the resistance of those parts to expected
stresses shall be verified by the execution of the test program in Clause 6.
5.7 General design
5.7.1 Mechanisms which are used for mounting the connector and/or termination of
conductors shall not be used to fix live parts in the connector housing, if it may impair the
proper function of the mechanism or reduce the clearance and creepage distances below the
requirements according to 5.18.
5.7.2 Connectors shall be so designed that connection of conductors of the type and cross-
sectional areas as specified by the manufacturer is possible. Besides the termination of the
conductor, care shall be taken that no damage of the insulation is possible, e.g. by avoiding
sharp edges.
5.7.3 Cables connected to the connector shall be suitable for use in photovoltaic systems.
The values of the rated current and the rated voltage shall have at least the rated values of
the connector. Cables shall be flexible and the conductor shall be at least class 5 according to
IEC 60228.
5.7.4 Non-rewirable connectors shall be so designed that:
– the flexible cable cannot be separated from the connector without making it permanently
useless,
– the connector cannot be disassembled or parts of it cannot be removed by hand or by
using a general purpose tool, for example a screwdriver, as intended,
– means are provided to prevent live parts, e.g. free strands of a conductor, from reducing
the minimum insulation distance between such live parts and all accessible external
surfaces of the connector, with the exception of the engagement face of the male
connector,
– a connector becomes useless for further use when for the re-mounting, other parts than
the original ones are necessary,
– connectors with non-rewirable terminations are also considered as rewirable, if they are
reconstituted with original parts and with tools of the manufacturer, if applicable.
If this cannot be granted by the design or manufacturing process itself, the in-process test
schedule according to 6.4 or another test of the same safety level shall be carried out.
5.8 Design of a free connector
In a free connector, the wires shall be protected against shear and tensile stress at the
termination and be secured to prevent twisting.
This requirement does not apply to
a) free connectors for termination to cables in fixed mountings (plug connection in the sense
of a detachable connection),
– 16 – IEC 62852:2014 © IEC 2014
b) free connectors in which the termination is protected against pull and twisting mounting
provisions in the end-use product.
5.9 Degree of protection (IP Code)
A connector shall have a degree of protection at least of IP55, according to IEC 60529.
Depending on the installation a higher degree of protection may be required.
5.10 Dielectric strength
A connector shall withstand the specified test voltage. Compliance is determined by the tests
according to 6.3.8.
5.11 Mechanical and electrical durability
5.11.1 A connector shall meet the mechanical operations without load of 50 operating cycles.
5.11.2 A non-rewirable connector shall withstand number of bends as described in 6.3.6.
Compliance shall checked by the execution of tests in 6.3.5 and 6.3.6.
5.12 Range of ambient temperature
A connector shall withstand the upper and lower values of temperature range as given in 5.2.1
or as specified by the manufacturer, if lower than the minimum value or higher than the
maximum value as defined in 5.2.1.
Compliance is determined by the tests according to test program in Clause 6.
5.13 Temperature rise
The sum of the ambient temperature and the temperature rise of a connector shall not exceed
the upper limiting temperature.
Compliance shall be checked by the execution of test 6.3.4.
5.14 Cable anchorage
The cable anchorage shall be suitable for the cable to be
...

IEC 62852 ®
Edition 1.1 2020-03
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Connectors for DC-application in photovoltaic systems – Safety requirements
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Connecteurs pour applications en courant continu pour systèmes
photovoltaïques – Exigences de sécurité et essais

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IEC 62852 ®
Edition 1.1 2020-03
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Connectors for DC-application in photovoltaic systems – Safety requirements

and tests
Connecteurs pour applications en courant continu pour systèmes

photovoltaïques – Exigences de sécurité et essais

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 27.160 ISBN 978-2-8322-8070-6

IEC 62852 ®
Edition 1.1 2020-03
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Connectors for DC-application in photovoltaic systems – Safety requirements
and tests
Connecteurs pour applications en courant continu pour systèmes
photovoltaïques – Exigences de sécurité et essais

– 2 – IEC 62852:2014+AMD1:2020 CSV
© IEC 2020
CONTENTS
FOREWORD . 4
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 8
4 Classification . 13
4.1 General . 13
4.2 Type of connector . 13
4.3 Additional characteristics . 13
5 Constructional requirements and performance . 13
5.1 General . 13
5.2 Marking and identification . 13
5.2.1 Identification . 13
5.2.2 Marking . 14
5.2.3 Technical documentation . 14
5.3 Provision against incorrect mating (non-intermateable) . 14
5.4 Protection against electric shock . 14
5.5 Terminations and connection methods . 14
5.6 Resistance to deterioration . 15
5.7 General design . 15
5.8 Design of a free connector . 16
5.9 Degree of protection (IP Code) . 16
5.10 Dielectric strength . 16
5.11 Mechanical and electrical durability . 16
5.12 Range of ambient temperature . 17
5.13 Temperature rise . 17
5.14 Cable anchorage . 17
5.14.1 Connectors intended to be used with cables specified by the
manufacturer . 17
5.14.2 Connectors intended to be used with generic cables . 18
5.15 Mechanical strength . 19
5.16 Connector without locking device . 19
5.17 Connector with locking device . 19
5.18 Clearances and creepage distances . 19
5.18.1 General . 19
5.18.2 Clearances . 20
5.18.3 Creepage distances . 20
5.19 Insulation parts . 22
5.19.1 General . 22
5.19.2 Outer accessible parts . 22
5.19.3 Inner parts . 22
5.20 Current carrying parts and resistance against corrosion . 22
6 Tests . 23
6.1 General . 23
6.2 Preparation of specimens . 23
6.3 Performance of tests . 24
6.3.1 General . 24

© IEC 2020
6.3.2 Durability of marking . 25
6.3.3 Protection against electric shock . 25
6.3.4 Temperature rise . 25
6.3.5 Mechanical operation . 25
6.3.6 Bending (flexing) test (see IEC 60309-1:1999, 24.4) . 26
6.3.7 Measurement of clearances and creepage distances . 27
6.3.8 Dielectric strength . 27
6.3.9 Corrosion test . 28
6.3.10 Mechanical strength at lower temperatures . 28
6.3.11 Change of temperature (IEC 60068-2-14 test Na) . 28
6.3.12 Damp heat test . 28
6.3.13 Insertion and withdrawal force . 29
6.3.14 Effectiveness of connector coupling device . 29
6.3.15 Terminations and connecting methods . 29
6.4 Test schedule (routine test) for non-rewirable free connectors . 30
6.5 Test schedule . 30
Annex A (informative) Warning symbols used on connectors . 37
Annex B (normative) Measurement of clearances and creepage distances . 38
Bibliography . 42

Figure 1 – Device for the bending test. 27
Figure A.1 – Symbol "DO NOT DISCONNECT UNDER LOAD" . 37
Figure A.2 – Symbol "DO NOT DISCONNECT UNDER LOAD” (IEC 60417-6070 (2014-
06)) . 37
Figure B.1– Examples of methods of measuring clearances and creepage distances . 41

Table 1 – Values for cable anchorage testing .
Table 2 – Rated impulse voltages and minimum clearances . 20
Table 3 – Creepage distances for basic insulation . 21
Table 4 – Plan of specimens required for tests . 23
Table 5 – Values of torque for screw-type clamping units . 24
Table 6 – Mechanical test group A (test group A are separate tests) . 30
Table 7 – Service life test group B . 31
Table 8 – Service life test group C . 32
Table 9 – Thermal test group D (mated test specimen) . 33
Table 10 – Climatic test group E (mated test specimen) . 34
Table 11 – Degree of protection, test group F . 35
Table 12 – Insulation material, test group G . 36
Table 13 – Pull forces for cord anchorage . 18
Table 14 – Values for torsion test . 19
Table B.1 – Dimensions of X . 38

– 4 – IEC 62852:2014+AMD1:2020 CSV
© IEC 2020
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
CONNECTORS FOR DC-APPLICATION IN PHOTOVOLTAIC SYSTEMS –
SAFETY REQUIREMENTS AND TESTS
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
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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.
This consolidated version of the official IEC Standard and its amendment has been
prepared for user convenience.
IEC 62852 edition 1.1 contains the first edition (2014-11) [documents 82/878/FDIS and
82/905/RVD] and its amendment 1 (2020-03) [documents 82/1646/FDIS and 82/1667/RVD].
In this Redline version, a vertical line in the margin shows where the technical content
is modified by amendment 1. Additions are in green text, deletions are in strikethrough
red text. A separate Final version with all changes accepted is available in this
publication.
© IEC 2020
International Standard IEC 62852 has been prepared by IEC technical committee 82: Solar
photovoltaic energy systems.
This International Standard is derived from EN 50521.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
The committee has decided that the contents of the base publication and its amendment 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.
IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.
– 6 – IEC 62852:2014+AMD1:2020 CSV
© IEC 2020
CONNECTORS FOR DC-APPLICATION IN PHOTOVOLTAIC SYSTEMS –
SAFETY REQUIREMENTS AND TESTS
1 Scope
This International Standard applies to connectors for use in the d.c. circuits of photovoltaic
systems according to class II of IEC 61140:2001 with rated voltages up to 1 500 V d.c. and
rated currents up to 125 A per contact.
This standard applies to connectors without breaking capacity but which might be engaged
and disengaged under voltage.
This standard also applies to connectors which are intended to be built-in or integrated in
enclosures of devices for photovoltaic systems. This standard may be used as a guide for
connectors in photovoltaic systems of classes 0 and III according to IEC 61140:2001 as well
as for protection for Class II equipment intended for use at less than 50 V d.c. This document
does not apply to connectors for data collection, tracker controls or similar, but it may be used
as a guide for those connectors.
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 (all parts): International Electrotechnical Vocabulary (available at
http://www.electropedia.org)
IEC 60060-1:2010, High-voltage test techniques – Part 1: General definitions and test
requirements
IEC 60068-1:2013, Environmental testing – Part 1: General and guidance
IEC 60068-2-14:2009, Environmental testing – Part 2-14: Tests – Test N: Change of
temperature
IEC 60068-2-75:1997, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60068-2-78:2012, Environmental testing – Part 2-78: Tests – Test Cab: Damp heat,
steady state
IEC 60112, Method for the determination of the proof and the comparative tracking indices of
solid insulating materials
IEC 60216-1, Electrical insulating materials – Thermal endurance properties – Part 1: Ageing
procedures and evaluation of test results
IEC 60216-5, Electrical insulating materials – Thermal endurance properties – Part 5:
Determination of relative thermal endurance index (RTE) of an insulating material
IEC 60228:2004, Conductors of insulated cables

© IEC 2020
IEC 60309-1:1999, Plugs, socket-outlets and couplers for industrial purposes – Part 1:
General requirements
IEC 60352-2:2006, Solderless connections – Part 2: Solderless crimped connections –
General requirements, test methods and practical guidance
IEC 60352-3:1993, Solderless connections – Part 3: Solderless accessible insulation
displacement connections – General requirements, test methods and practical guidance
IEC 60352-4:1994, Solderless connections – Part 4: Solderless non-accessible insulation
displacement connections – General requirements, test methods and practical guidance
IEC 60352-5:2012, Solderless connections – Part 5: Press-in connections – General
requirements, test methods and practical guidance
IEC 60352-6:1997, Solderless connections – Part 6: Insulation piercing connections – General
requirements, test methods and practical guidance
IEC 60352-7:2002, Solderless connections – Part 7: Spring clamp connections – General
requirements, test methods and practical guidance
IEC 60364-7-712:2002, Electrical installations of buildings – Part 7-712: Requirements for
special installations or locations – Solar photovoltaic (PV) power supply systems
IEC 60512 (all parts), Connectors for electronic equipment – Tests and measurements
IEC 60512-1:2001, Connectors for electronic equipment – Tests and measurements – Part 1:
General
IEC 60512-11-7:2003, Electromechanical components for electronic equipment – Basic testing
procedures and measuring methods – Part 11-7: Climatic tests – Test 11g: Flowing mixed gas
corrosion test
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60664-1:2007, Insulation coordination for equipment within low voltage systems – Part 1:
Principles, requirements and tests
IEC TR 60664-2-1, Insulation coordination for equipment within low-voltage systems –
Part 2-1: Application guide – Explanation of the application of the IEC 60664 series,
dimensioning examples and dielectric testing
IEC 60695-2-11:2014, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods -
Glow-wire flammability test method for end-products (GWEPT)
IEC 60695-11-10:2013, Fire hazard testing – Part 11-10: Test flames – 50 W horizontal and
vertical flame test methods
IEC TR 60943:1998, Guidance concerning the permissible temperature rise for parts of
electrical equipment, in particular for terminals
IEC 60998-2-3:2002, Connecting devices for low-voltage circuits for household and similar
purposes – Part 2-3: Particular requirements for connecting devices as separate entities with
insulation-piercing clamping units

– 8 – IEC 62852:2014+AMD1:2020 CSV
© IEC 2020
IEC 60999-1:1999, Connecting devices – Electrical copper conductors – Safety requirements
for screw-type and screwless-type clamping units – Part 1: General requirements and
2 2
particular requirements for clamping units for conductors from 0,2 mm up to 35 mm
(included)
IEC 60999-2:2003, Connecting devices – Electrical copper conductors – Safety requirements
for screw-type and screwless-type clamping units – Part 2: Particular requirements for
2 2
clamping units for conductors above 35 mm up to 300 mm (included)
IEC 61032:1997, Protection of persons and equipment by enclosures – Probes for verification
IEC 61140:2001, Protection against electric shock – Common aspects for installation and
equipment
IEC 61210:2010, Connecting devices – Flat quick-connect terminations for electrical copper
conductors –Safety requirements
IEC 61215:2005, Crystalline silicon terrestrial photovoltaic (PV) modules – Design
qualification and type approval
IEC 61215-2, Terrestrial photovoltaic (PV) modules – Design qualification and type approval –
Part 2: Test procedures
IEC 61984:2008, Connectors – Safety requirements and tests
IEC 62444:2010, Cable glands for electrical installations
IEC TS 62548, Photovoltaic (PV) arrays – Design requirements
IEC 62930, Electric cables for photovoltaic systems with a voltage rating of 1,5 kV DC
ISO 868, Plastics and ebonite – Determination of indentation hardness by means of a
durometer (Shore hardness)
ISO 4892-2, Plastics – Methods of exposure to laboratory light sources – Part 2: Xenon-arc
sources
ISO 4892-3, Plastics – Methods of exposure to laboratory light sources – Part 3: Fluorescent
UV-lamps
ISO 6988:1985, Metallic and other non organic coatings – Sulfur dioxide test with general
condensation of moisture
3 Terms and definitions
For the purposes of this document, the terms and definitions given in IEC 60050-581,
IEC 60050-826, IEC 60309-1, IEC 60664-1, IEC 60999-1 and IEC 61140, as well as the
following apply.
3.1
connector
component which terminates conductors for the purpose of providing connection to and
disconnection from a suitable mating component
[SOURCE: IEC 60050-581:2008, 581-06-01]

© IEC 2020
3.2
multi-way connector
connector with more than one contact
Note 1 to entry: Multiple single-way connectors used in a PV-junction box are not to be regarded as a multi-way
connector according to this standard.
3.3
connector under voltage
CuV
connector specially designed to be engaged or disengaged in normal use when live but not
under load
Note 1 to entry: In this standard, the term "live" is used if contacts are under an applied voltage, but not
necessarily carrying current. The term "load" is used if a current is flowing through the contacts.
3.4
connector without breaking capacity
COC
connector which is not allowed to be engaged or disengaged in normal use when live or under
load
[SOURCE: IEC 60050-581:2008, 581-27-73]
3.5
type of connector
3.5.1
free connector
connector for attachment to the free end of a wire or cable
[SOURCE: IEC 60050-581:2008, 581-06-12]
3.5.2
built-in connector
a pre-manufactured connector that is subsequently integrated into an enclosure
3.5.3
integrated connector
a connector assembly that is manufactured as an integral component during enclosure
fabrication
3.6
non-rewirable connector
connector so constructed that the cable cannot be separated from the connector without
making it permanently useless
[SOURCE: IEC 60309-1:1999, 2.5, modified]
3.7
connector for Class II equipment
connector in which the protection against indirect contact is realised by double or reinforced
insulation
Note 1 to entry: Class II according to IEC 61140.
3.8
intended use
application conditions of connectors which are included within the permissible rated values
and environmental conditions and characteristics assigned by the manufacturer

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3.9
interlock
device, either electrical or mechanical, which prevents the contacts of a connector from
becoming live before it is in proper engagement with its counterpart, and which either
prevents the connector from being withdrawn while its contacts are live or makes the contacts
dead before separation
[SOURCE: IEC 60309-1:1999, 2.9, modified]
3.10
cycle of mechanical operation
one insertion and one withdrawal of the connector with his counterpart
3.11
clamping unit
part(s) of the terminal necessary for the mechanical clamping and the electrical connection of
the conductor(s), including the parts which are necessary to ensure the correct contact
pressure
[SOURCE: IEC 60999-1:1999, 3.1]
3.12
upper limiting temperature
maximum temperature of a connector as defined by the manufacturer, in which the connector
is intended to operate
Note 1 to entry: The abbreviation ULT is often used.
3.13
maximum ambient temperature
maximum temperature of the ambient assigned from the manufacturer, in which the connector
is able to operate permanently without the upper limiting temperature being exceeded
3.14
lower limiting temperature
minimum temperature of a connector as defined by the manufacturer in which a connector is
intended to operate
Note 1 to entry: The abbreviation LLT is often used.
3.15
clearance
the shortest distance in air between two conductive parts
[SOURCE: IEC 60664-1:2007, 1.3.2]
3.16
creepage distance
shortest distance along the surface of the insulating material between two conductive parts
[SOURCE: IEC 60664-1:2007, 1.3.3]
3.17
overvoltage category
numeral defining a transient overvoltage condition
[SOURCE: IEC 60664-1:2007, 1.3.10]

© IEC 2020
3.18
pollution
any addition of foreign matter, solid, liquid, or gaseous, that can result in a reduction of
electric strength or surface resistivity of the insulation
[SOURCE: IEC 60664-1:2007, 1.3.11]
3.19
pollution degree
numeral characterising the expected pollution of the micro-environment
[SOURCE: IEC 60664-1:2007, 1.3.13]
3.20
rated voltage
value of voltage assigned by the manufacturer to the connector and to which operation and
performance characteristics are referred
Note 1 to entry: Rated voltage is equivalent to the rated system voltage according to IEC 61730-1.
[SOURCE: IEC 60664-1:2007, 1.3.9, modified]
3.21
rated insulation voltage
r.m.s. withstand voltage value assigned by the manufacturer to the connector, characterising
the specified (long term) withstand capability of its insulation
Note 1 to entry: The rated insulation voltage is not necessarily equal to the rated voltage, which is primarily
related to functional performance.
[SOURCE: IEC 60664-1:2007, 1.3.9.1, modified]
3.22
rated impulse voltage
impulse withstand voltage value assigned by the manufacturer to the connector,
characterising the specified withstand capability of its insulation against transient
overvoltages
[SOURCE: IEC 60664-1:2007, 1.3.9.2, modified]
3.23
impulse withstand voltage
highest peak value of impulse voltage, of prescribed form and polarity which does not cause
breakdown of the insulation under specified conditions
Note 1 to entry: The impulse withstand voltage is equal to or higher than the rated impulse voltage.
[SOURCE: IEC 60664-1:2007, 1.3.8.1]
3.24
r.m.s. withstand voltage
power-frequency withstand voltage
highest r.m.s. value of a voltage which does not cause breakdown of the insulation under
specified conditions
[SOURCE: IEC 60664-1:2007, 1.3.8.2]

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3.25
rated current
current value assigned by the manufacturer, which the connector can carry continuously
(without interruption) and simultaneously through all its contacts wired with the largest
specified conductor, preferably at an ambient temperature of 85 °C, without the upper limiting
temperature being exceeded
Note 1 to entry:If other ambient temperature values are used for the definition of the rated current, the
manufacturer should state in the technical documentation the ambient temperature on which the rating is based,
with reference, if appropriate, to the derating curve defined in IEC 60512-5-2, test 5b.
3.26
functional insulation
insulation between conductive parts which is necessary only for the proper functioning of the
equipment
[SOURCE: IEC 60664-1:2007, 1.3.17.1]
3.27
basic insulation
insulation applied to live parts to provide basic protection against electric shock
Note 1 to entry: Basic insulation does not necessarily include insulation used exclusively for functional purposes
(see IEC 61140:2001, 3.10.1).
[SOURCE: IEC 60664-1:2007, 1.3.17.2]
3.28
supplementary insulation
independent insulation applied in addition to basic insulation, in order to provide protection
against electric shock in the event of a failure of basic insulation (see IEC 61140:2001,
3.10.2)
[SOURCE: IEC 60664-1:2007, 1.3.17.3]
3.29
double insulation
insulation comprising both basic insulation and supplementary insulation (see
IEC 61140:2001, 3.10.3)
[SOURCE: IEC 60664-1:2007, 1.3.17.4]
3.30
reinforced insulation
single insulation system applied to live parts, which provides a degree of protection against
electric shock equivalent to double insulation under the conditions specified in the relevant
IEC standard (see IEC 61140:2001, 3.10.4)
Note 1 to entry: A single insulation system does not imply that the insulation is a homogeneous piece. It may
comprise several layers which cannot be tested separately as basic or supplementary insulation.
[SOURCE: IEC 60664-1:2007, 1.3.17.5]
3.31
internal insulation
part of basic insulation providing the required clearance and creepage distances inside a
conductive housing or enclosure

© IEC 2020
4 Classification
4.1 General
In order to apply the relevant test requirements, connectors shall be classified by the
manufacturer’s specification, according to their intended use under consideration of class II,
according to IEC 61140 and characteristics, as set out below.
4.2 Type of connector
a) Free connector.
b) Built-in connector.
c) Integrated connector.
4.3 Additional characteristics
a) Connector with cable anchorage.
b) IP-code of a connector according to IEC 60529.
c) Connector for Class II equipment.
d) Non-rewirable connector.
e) Rewirable connector.
f) Terminations and connection methods.
5 Constructional requirements and performance
5.1 General
This standard does not define electrical rating values for voltage and current. These values
are assigned by the manufacturer.
Connectors shall be suitable for durable outdoor use in an ambient temperature area from
–40 °C to +85 °C.
Multi-way connectors shall be designed so that these requirements for earth-faulted and
short-circuit-proofed installation complies with IEC TS 62548 or IEC 60364-7-712.
Compliance with the requirements is verified by the specified tests of this standard.
5.2 Marking and identification
5.2.1 Identification
Connectors shall be identified and characterised by the following:
a) manufacturer’s name, trademark or mark of origin;
b) type reference (for example, the catalogue number);
c) rated current in amperes (A);
d) rated voltages or rated insulation voltages between line to earth and line to line in volts
(V);
e) rated impulse voltage in kilovolts (kV), if specified;
f) pollution degree;
g) degree of protection by enclosure according to IEC 60529;
h) range of temperature (ULT and LLT, maximum ambient temperature) specified
temperatures: ULT, LLT, maximum ambient temperature (minimum +85 °C);

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i) type of terminals;
j) connectable conductors;
NOTE For current capacity of cables and wires, see IEC 60364-5-52.
k) reference to this standard or to the Detail Specification (DS), if applicable;
l) symbols „Do not disconnect under load“, as given in Annex A; alternatively an adequate
warning notice can be found in particular national language;
m) polarity of connector, if applicable;
n) RTE/RTI or TI (mechanical and electrical) of all polymeric insulating materials used in the
connector.
5.2.2 Marking
The marking shall be indelible and easily legible.
The minimum marking on the connector shall be that of item a), l) and m) in 5.2.1.
Symbol or warning notice listed in I) of 5.2.1 shall be imprinted or labelled close to connector.
A notice to attach the label shall be given in technical documentation.
Markings a) and b) of 5.2.1 shall be applied on the smallest package unit.
5.2.3 Technical documentation
Identification items of 5.2.1 not marked on the connector according to 5.2.2 and the following
information shall be given in the technical documentation of the manufacturer:
a) information regarding the type of cable suitable for termination, if applicable;
b) information regarding mounting, if applicable;
c) assembly information such as required tooling (part number) by manufacturer, if
applicable.
5.3 Provision against incorrect mating (non-intermateable)
A multi-way connector shall be so designed that contact between live contacts of different
polarity is not possible by engagement.
Compliance shall be tested by performing a polarisation test (see A3 of Table 6).
5.4 Protection against electric shock
5.4.1 A connector shall be so designed that, after mounting, its live parts are not accessible
by the IEC test finger in accordance with IEC 60529.
5.4.2 Protection against electric shock shall be ensured also during insertion and
withdrawal. Compliance shall be tested by the IEC test probe 11 in accordance with
IEC 61032.
5.5 Terminations and connection methods
This standard applies to the following terminations and connection methods:
a) crimped connections according to IEC 60352-2
b) insulation displacement connections according to IEC 60352-3 (accessible IDC) or
IEC 60998-2-3
c) insulation displacement connections according to IEC 60352-4 (non-accessible
IDC) or IEC 60998-2-3
© IEC 2020
d) press-in connections according to IEC 60352-5
e) insulation piercing connections according to IEC 60352-6 or IEC 60998-2-3
f) screwless-type clamping units according to IEC 60999-1 or IEC 60999-2
or IEC 60352-7
g) screw-type clamping units according to IEC 60999-1 or IEC 60999-2
h) flat, quick-connect terminations according to IEC 61210
As a minimum the applicable tests according to 6.3.15 shall be performed for all terminations
and connection methods intended to be used.
Other terminations and connection methods shall be tested in accordance with the relevant
standards.
Soldering and welding connections are also permitted.
Termination and connection methods shall provide sufficient means for retaining the
conductor in position.
Electrical connections shall be so designed that the contact pressure is not transmitted
through insulating material other than ceramic, pure mica or other material with characteristics
not less suitable, unless there is sufficient resiliency in the metallic parts to compensate for
any shrinkage or yielding of the insulating material (see IEC 60309-1:1999, 25.3 or
IEC 60999-1:1999, Clause 7 or IEC 60999-2). Insulation piercing terminations and insulation
displacement connections are excluded from this requirement because of the tests performed
according to IEC 60352-6 or IEC 60998-2-3.
Precautions shall be taken to ensure that adequate contact pressure is maintained during
connector lifetime.
To compensate for changes during use, (e.g. loosening at screw-type clamping units caused
by thermal cycles) the use of a lock washer, spring washer or similar could be sufficient.
All terminations and connection methods shall be protected from mechanical and excessive
thermal stress which could cause increased contact resistance.
5.6 Resistance to deterioration
If deterioration of specific parts might impair safety, the resistance of those parts to expected
stresses shall be verified by the execution of the test program in Clause 6.
5.7 General design
5.7.1 Mechanisms which are used for mounting the connector and/or termination of
conductors shall not be used to fix live parts in the connector housing, if it may impair the
proper function of the mechanism or reduce the clearance and creepage distances below the
requirements according to 5.18.
5.7.2 Connectors shall be so designed that connection of conductors of the type and cross-
sectional areas as described in 5.7.3 and as specified by the manufacturer is possible.
Besides the termination of the conductor, care shall be taken that no damage of the insulation
is possible, e.g. by avoiding sharp edges.

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5.7.3 Cables connected to the connector shall be suitable for use in photovoltaic systems
and shall comply with the requirements of IEC 62930. The values of the rated current and the
rated voltage shall have at least the rated values of the connector. Cables shall be flexible
and the conductor shall be at least class 5 according to IEC 60228.
The class of the conductor shall be Cl
...