IEC 60670-22:2003

IEC 60670-22 ®
Edition 1.1 2015-03
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Boxes and enclosures for electrical accessories for household and similar fixed
electrical installations –
Part 22: Particular requirements for connecting boxes and enclosures

Boîtes et enveloppes pour appareillage électrique pour installations électriques
fixes pour usage domestique et analogue –
Partie 22: Règles particulières concernant les boîtes et enveloppes de
connexion
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IEC 60670-22 ®
Edition 1.1 2015-03
CONSOLIDATED VERSION
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Boxes and enclosures for electrical accessories for household and similar fixed

electrical installations –
Part 22: Particular requirements for connecting boxes and enclosures

Boîtes et enveloppes pour appareillage électrique pour installations électriques

fixes pour usage domestique et analogue –

Partie 22: Règles particulières concernant les boîtes et enveloppes de

connexion
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 29.120.10 ISBN 978-2-8322-2588-2

IEC 60670-22 ®
Edition 1.1 2015-03
CONSOLIDATED VERSION
REDLINE VERSION
VERSION REDLINE
colour
inside
Boxes and enclosures for electrical accessories for household and similar fixed
electrical installations –
Part 22: Particular requirements for connecting boxes and enclosures

Boîtes et enveloppes pour appareillage électrique pour installations électriques
fixes pour usage domestique et analogue –
Partie 22: Règles particulières concernant les boîtes et enveloppes de
connexion
– 2 – IEC 60670-22:2003
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CONTENTS
FOREWORD . 3
1 Scope . 5
2 Normative references . 5
3 Definitions . 5
4 General requirements . 6
5 General notes on tests . 6
6 Ratings . 7
7 Classification . 7
8 Marking . 7
9 Dimensions . 8
10 Protection against electric shock . 8
11 Provision for earthing . 8
12 Construction . 8
13 Resistance to ageing, protection against ingress of solid objects and against
harmful ingress of water . 9
14 Insulation resistance and electric strength . 9
15 Mechanical strength . 10
16 Resistance to heat . 10
17 Creepage distances, clearances and distances through sealing compound . 11
18 Resistance of insulating material to abnormal heat and to fire . 12
19 Resistance to tracking . 12
20 Resistance to corrosion . 12
21 Electromagnetic compatibility (EMC) . 12
Annex AA (informative) . 14
Annex BB (informative) Schematic presentation of connecting devices as a basis for
the definitions . 15

Figure 101 – Single terminal device . 13
Figure 102 – Multiway terminal device . 13
Figure AA.1 – Four examples of connecting boxes/enclosures . 14
Figure BB.1 – Schematic presentation . 15

Table 101 – Relationship between rated connecting capacity and test current . 11
Table 102 – Creepage distances, clearances and distances through sealing compound . 12

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INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES FOR
HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIONS –
Part 22: Particular requirements for connecting boxes and enclosures
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-
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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
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3) IEC Publications have the form of recommendations for international use and are accepted by IEC National
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between any IEC Publication and the corresponding national or regional publication shall be clearly indicated in
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5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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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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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 60670-22 edition 1.1 contains the first edition (2003-05) [documents 23B/700/FDIS and
23B/704/RVD] and its amendment 1 (2015-03) [documents 23B/1174/FDIS and 23B/1182/RVD].
In this Redline version, a vertical line in the margin shows where the technical content is
modified by amendment 1. Additions and deletions are displayed in red, with deletions being
struck through. A separate Final version with all changes accepted is available in this
publication.
– 4 – IEC 60670-22:2003
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International Standard IEC 60670-22 has been prepared by subcommittee 23B: Plugs, socket-
outlets and switches, of IEC Technical Committee 23: Electrical accessories.
This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
This standard shall be used in conjunction with IEC 60670-1. It lists the changes necessary
to convert that standard into a specific standard for connecting boxes and enclosures.
In this publication:
a) the following print types are used:
 requirements proper: in roman type.
 test specifications: in italic type.
 notes: in smaller roman type.
b) subclauses, figures or tables which are additional to those in Part 1 are numbered starting
from 101.
Annex AA and Annex BB is are for information only.
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.
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BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES FOR
HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIONS –

Part 22: Particular requirements for connecting boxes and enclosures

1 Scope
This clause of Part 1 applies with the following addition:
Add after the fourth paragraph:
This standard applies to connecting boxes for junction(s) and/or tapping(s).
NOTE Unless otherwise stated, throughout the document the term “boxes” also applies to “enclosures”.
2 Normative references
This clause of Part 1 applies with the following addition:
IEC 60998 (series), Connecting devices for low-voltage circuits for household and similar
purposes
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)
3 Definitions
This clause of Part 1 applies with the following additions:
3.101
connecting box
junction box
box allowing connection of conductors
3.101.1
junction connecting box
connecting box allowing connection of one or more junctions
3.101.2
tapping connecting box
connecting box allowing connection of one or more taps from one or more main conductors
NOTE Connecting boxes according to 3.101.1 and 3.101.2 may be combined.
3.101.3
cord outlet connecting box
connecting box allowing one or more connections to be made between a fixed installation and
a flexible cable
– 6 – IEC 60670-22:2003
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3.102
connecting box with integral integrated clamping units
connecting box in which clamping units are permanently retained as an integral integrated
part of the box (see Annex AA)
3.103
connecting box with incorporated terminals or connecting devices
connecting box with detachable terminals or connecting devices retained within the box by
mechanical means (see Annex AA)
3.104
connecting box with provisions for subsequent incorporation of terminals or
connecting devices
connecting box with provisions for incorporating terminals or connecting devices to be
retained within the box by mechanical means (see Annex AA)
3.105
connecting box for floating terminals or connecting devices
connecting box intended to accommodate terminals or connecting devices but without provision
to retain them (see Annex AA)
3.106
rated connecting capacity
cross-sectional area of the largest conductors as declared by the manufacturer
3.107
terminal
insulated or non-insulated re-usable connecting device intended for electrical connection of
conductors of cables
conductive part of one pole comprising one or more clamping unit(s) and insulation if
necessary
3.108
clamping unit
part(s) of a terminal necessary for the mechanical clamping and the electrical connection of
the conductor(s) including the parts which are necessary to ensure correct contact pressure
3.109
connecting device
device for the electrical connection of two or more conductors comprising one or more
terminals and if necessary, insulation and/or ancillary parts
NOTE For a schematic representation of connecting devices see Figure BB.1 of Annex BB.
4 General requirements
This clause of Part 1 is applicable with the following addition:
Connecting devices incorporated in connecting boxes shall comply with the requirements of
the IEC 60998 series; integrated clamping units shall comply with the requirements of the
IEC 60999 series.
NOTE In the following countries terminal blocks according to IEC 60947-7-1 and -7-2 are allowed to be
incorporated in connecting boxes: DE.
5 General notes on tests
This clause of Part 1 applies with the following addition:

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5.2 Add at the end:
Connecting boxes with provision for subsequent incorporation of terminals or connecting
devices clamping units are tested with the terminals or connecting devices clamping units
recommended by the manufacturer.
Connecting devices according to the IEC 60998 series need not be tested again.
NOTE 1 In the following countries terminal blocks according to IEC 60947-7-1 and -7-2 need not be tested again:
DE
NOTE 2 In the following countries connecting boxes shall be tested either:
 with their incorporated terminals or connecting devices or
 with the terminals or connecting devices recommended by the manufacturer for connecting boxes with
provision for subsequent incorporation of terminals or connecting devices:
UK.
6 Ratings
This clause of Part 1 is replaced by:
6.1 The preferred values of the rated voltage of the integrated or incorporated connecting
devices are 125 V 130 V, 250 V, 300 V, 400 V 450 V, 500 V, 600 V, 690 V 750V, 800 V,
1 000 V a.c. and 1 500 V d.c.
2 2 2 2
6.2 The standard rated connecting capacities are 0,2 mm , 0,34 mm , 0,5 mm , 0,75 mm ,
2 2 2 2 2 2 2 2 2
1 mm , 1,5 mm , 2,5 mm , 4 mm , 6 mm , 10 mm , 16 mm , 25 mm , 35 mm .
NOTE 1 For the time being, designation by wire gauge may be used in some countries (for example AWG in US
and CA), instead of the cross-sectional areas expressed in mm .
NOTE 2 The approximate relation between mm and AWG sizes is given in Appendix A of IEC 60999-1.
NOTE 3 In UK, a standard connecting capacity of 1,25 mm is used.
2 2 2 2 2 2
NOTE 4 In Japan, standard connecting capacities of 0.9 mm ,1.25 mm ,2.0 mm , 3.5 mm , 5.5 mm , 8 mm ,
2 2
14 mm , 22 mm are used.
7 Classification
This clause of Part 1 applies with the following addition:
Add the following:
7.101 The method of fixing the 7.101.1 With integrated clamping units
terminals or connecting devices

in the connecting box
7.101.2 With incorporated terminals or

connecting devices
7.101.3 With provisions for subsequent
incorporation of terminals or connecting
devices
7.101.4 Without fixing (for floating
terminals or connecting devices)
8 Marking
This clause of Part 1 applies with the following additions:
8.1 Add after j):
k) rated insulation voltage for boxes with integrated or incorporated terminals or connecting
devices (see note 1),
– 8 – IEC 60670-22:2003
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l) rated connecting capacity (see notes 1 and 2),
m) maximum number of conductors to be placed in the box (see notes 1 and 2).
The information l) and m) are optional for boxes classified according to 7.101.4.
n) Boxes and enclosures classified according to 7.101.1 or 7.101.2 shall be marked with an
appropriate rated current which does not exceed the test current given in Table 101.
NOTE 1 In the case of:
– integrated clamping units, k), l) and n) should be marked on the boxes,
– incorporated terminals or connecting devices, the marking k), l) and n) if marked on the box or on the
incorporated terminals or connecting devices, should be visible during installation,
– empty boxes for floating terminals or connecting devices classified according to 7.101.4, the marking l)
and m), if marked on the box, should be visible during installation.
NOTE 2 The manufacturer may mark or declare more than one combination of l) and m). This information is
mandatory for boxes classified according to 7.101.4 in the following countries: DE and SE.
Add the following subclause:
8.101 When symbols are used they shall be as follows:
Volt . V
Rated connecting capacity . mm or  or AWG
9 Dimensions
This clause of Part 1 applies.
10 Protection against electric shock
This clause of Part 1 applies.
11 Provision for earthing
This clause of Part 1 applies.
12 Construction
This clause of Part 1 applies with the following modifications:
12.1 Add after the first paragraph:
In connecting boxes where the fixing means of covers or cover-plates serve also to fix the
connecting device, it shall maintain the connecting device in the correct position after removal
of the cover or cover-plate.
Compliance is checked by inspection.
Add the following subclauses:
12.101 Connecting boxes shall have adequate space to allow the correct connection of
conductors which are specified in the relevant sections of the particular requirements of
Parts 2 of IEC 60998, concerning the number and cross-sectional area of the conductors.

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Compliance is checked by fitting the maximum number of conductors of the maximum cross-
sectional area if it is the worst case. If not, the most unfavourable combination shall be
checked.
This test shall be carried out in conjunction with that of 12.102.
For boxes classified according to 7.101.4 the test is made only if l) and m) of 8.1 are marked
or declared.
12.102 Retention means for terminals or connecting devices shall withstand the mechanical
stresses occurring during installation and normal use.
Compliance is checked by connecting conductors in accordance with the relevant Part(s) 2 of
IEC 60998 for the type of the connecting device used.
After the test there shall be no harmful deformation, cracks or similar damage which would
lead to non-compliance with this part.
12.103 Connecting boxes classified according to 7.101.1, 7.101.2 and 7.101.3 shall comply
with the temperature rise requirements of Clause 16.102.
13 Resistance to ageing, protection against ingress of solid objects and
against harmful ingress of water
This clause of Part 1 applies with the following addition:
13.3.3 Replace the last paragraph by the following:
The specimens, except connecting boxes classified according to 7.101.4, shall withstand an
electric strength test specified in 14.2 which shall be started within 5 min of the completion of
the test according to this subclause.
14 Insulation resistance and electric strength
This clause of Part 1 applies with the following addition:
Add the following:
14.2.101 For boxes with integrated or incorporated terminals or connecting devices, the
measurements are made consecutively as indicated below.
Each clamping unit of a connecting device shall be connected alternatively with conductors of
the smallest and the largest cross-sectional area.
The insulation resistance is then measured with a d.c. voltage of approximately 500 V applied,
the measurement being made 1 min after application of the voltage.
a) between all clamping units connected together and the body for connecting devices
without fixing means or between all clamping units connected together and the mounting
base for connecting devices with fixing means;
b) between each clamping unit and all others connected to the body for connecting devices
without fixing means or between each clamping unit and all others connected to the
mounting base for connecting devices with fixing means.
The metal foil is applied in such a way that the sealing compound, if any, is effectively tested.

– 10 – IEC 60670-22:2003
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15 Mechanical strength
This clause of Part 1 applies with the following amendment:
15.1 2 Replace the note sixth paragraph by the following:
NOTE Damage to the finish, small dents which do not reduce creepage distances or
clearances below the value specified in Table 102 and small chips which do not adversely
affect the protection against electric shock or harmful ingress of water are disregarded.
16 Resistance to heat
This clause of Part 1 applies with the following addition:
Add the following subclauses:
16.101 Connecting devices having parts of insulating material shall be sufficiently resistant
to heat.
Compliance is checked by the test of 16.101.1 to 16.101.3.
16.101.1 The specimens or portions of the specimens are kept for 1 h in a heating cabinet at
a temperature of (85 ± 2)°C.
During the test they shall not undergo any change impairing their further use and sealing
compound if any, shall not flow to such an extent that live parts are exposed.
After the test and after the specimens have been allowed to cool to approximately ambient
temperature, there shall be no access to live parts which are normally not accessible when
the specimens are mounted as in normal use, even if the test probe B of IEC 61032 is applied
with a force not exceeding 5 N.
After the test, markings shall still be legible.
16.101.2 Parts of the insulating material not necessary to retain current carrying parts and
parts of the earthing circuit in position, even though they are in contact with them, are
subjected to a ball-pressure test as described in clause 16.1 of Part 1 but at a temperature of
(70 ± 2) °C or (40 ± 2) °C, plus the highest temperature rise determined for the relevant part
during the test of 16.102.4, whichever is the higher.
16.101.3 Parts of the insulating material necessary to retain current carrying parts and parts
of the earthing circuit in position are subjected to a ball pressure test in a heating cabinet at
a temperature of (125 ± 2) °C.
16.102 Connecting devices integrated or incorporated in connecting boxes shall be so
constructed that the temperature rise in normal use does not exceed the value specified in
16.102.4.
Compliance is checked by the tests of 16.102.1 to 16.102.3.
NOTE In the following countries connecting devices integrated or incorporated in connecting boxes shall be so
constructed that the temperature rise in normal use does not exceed the values specified in 16.102.4. Compliance
is checked by the tests of 16.102.1 to 16.102.3: UK.
16.102.1 Connecting devices with a single terminal (see Figure 101) having one or more
clamping units shall be connected to conductors in the intended manner and the most
unfavourable conditions.
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16.102.2 For multiway terminal devices a maximum of 3 adjacent terminals are connected in
series. If single pole connecting devices are designed to be mounted side by side, 3 devices
are placed in the intended manner and connected together (see Figure 102).
16.102.3 The connections are made with new rigid or flexible conductors of the largest
cross-sectional area appropriate to the clamping units, the clamping units being connected
according to the specifications of the relevant part of IEC 60998.

Conductor length shall be 1 m for a cross-sectional area up to and including 10 mm and 2 m
for a cross-sectional area above 10 mm . Conductor length may be reduced in agreement
with the manufacturer.
16.102.4 Temperature rise measurements are made when the device under test has reached
thermal equilibrium. It is generally accepted that the temperature is stable when the
temperature of the part under test does not increase by more than 1 K/h. During the test
the devices are loaded with an alternating current having the value shown in Table 101 for the
corresponding rated connecting capacity.
The temperature is determined by means of colour changing indicators or thermocouples, so
chosen and positioned that they have a negligible effect on the temperature being determined
(e.g. on the metallic part in contact with the conductor).
Table 101 – Relationship between rated connecting capacity and test current
Rated connecting capacity Test current
mm A
0,2 4
0,34 5
0,5 6
0,75 9
1 13,5
1,5 17,5
2,5 24
4 32
6 41
10 57
16 76
25 101
35 125
The temperature rise of current-carrying parts of the clamping unit shall not exceed 45 K, it
being understood that in the case of an insulated device the temperature rise of the conductor
shall be measured as close as possible to the clamping unit.
NOTE For the purpose of the test of 16.101.2, the temperature rise of external parts of insulating material not
necessary to retain current-carrying parts and parts of the earthing circuit in position, even though they are in
contact with them, is also determined.
17 Creepage distances, clearances and distances through sealing compound
Creepage distances, clearances and distances through sealing compound shall not be less
than the value shown in Table 102.
This test does not apply to boxes for floating terminals or connecting devices classified
according to 7.101.4.
– 12 – IEC 60670-22:2003
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Table 102 – Creepage distances, clearances and distances through sealing compound
Creepage distance, clearance and
Rated voltage
distance through sealing compound
V
mm
1,5
≤130
3,0
>130 and ≤250
>250 and ≤450 4,0
6,0
>450 and ≤750
>750 8,0
Compliance is checked by measurement between the following parts:
Creepage distances and clearances:
– between live parts of different polarity;
– between live parts and
• metal covers and boxes without insulating lining;
• the surface on which the box is mounted.
Distances through sealing compound:
– between live parts covered with sealing compound and the surface on which the box is
mounted.
For multi-way terminal devices and terminals without fixing means but with protection,
distances are measured between live parts and any opening which represents the closest
point liable to touch any other part when the terminal is fitted with conductors having the
largest cross-sectional area.
This test does not apply to boxes for floating terminals or connecting devices classified
according to 7.101.4.
In cases where various terminals or connecting devices may be mounted in the box, the most
unfavourable combinations shall be tested.
18 Resistance of insulating material to abnormal heat and to fire
This clause of Part 1 applies.
19 Resistance to tracking
This clause of Part 1 applies.
20 Resistance to corrosion
This clause of Part 1 applies.
21 Electromagnetic compatibility (EMC)
This clause of Part 1 applies.

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L is 1 m up to and including 10 mm
L L
L is 2 m above 10 mm
IEC  1529/03
Figure 101 – Single terminal device

L
L
Connecting devices
L
L
L is 1 m up to and including 10 mm
L is 2 m above 10 mm
IEC  1530/03
Figure 102 – Multiway terminal device

– 14 – IEC 60670-22:2003
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Annex AA
(informative)
Examples of connecting boxes/enclosures

Figure AA.1a – Enclosures with
integral integrated clamping units
according to 7.101.1
IEC  1531/03
Figure AA.1b – Enclosures with
incorporated terminals or connecting
devices according to 7.101.2
IEC  1532/03
Figure AA.1c – Enclosures with
provisions for incorporating
IEC  1533/03
subsequently subsequent
incorporation of terminals or
connecting devices according to
7.101.3
IEC
Figure AA.1d – Enclosures with
without fixing (for floating terminals
or connecting devices) according to
7.101.4
IEC  1534/03
Figure AA.1 – Four examples of connecting boxes/enclosures

+AMD1:2015 CSV  IEC 2015
Annex BB
(informative)
Schematic presentation of connecting devices
as a basis for the definitions
Clamping unit(s)
Terminal(s)
Insulation if
necessary
Ancillary parts
if necessary
Insulation if
necessary
Connecting device
IEC
Figure BB.1 – Schematic presentation

______________
– 16 – IEC 60670-22:2003
+AMD1:2015 CSV  IEC 2015
SOMMAIRE
1 Domaine d’application . 19
2 Références normatives . 19
3 Définitions . 19
4 Règles générales . 20
5 Notes générales sur les essais . 21
6 Caractéristiques assignées . 21
7 Classification . 21
8 Marquage . 21
9 Dimensions . 22
10 Protection contre les chocs électriques . 22
11 Dispositions pour la mise à la terre . 22
12 Construction . 22
13 Résistance au vieillissement, protection contre la pénétration de corps solides et
contre la pénétration nuisible de l’eau . 23
14 Résistance d’isolement et rigidité diélectrique . 23
15 Résistance mécanique . 24
16 Résistance à la chaleur . 24
17 Lignes de fuite, distances d’isolement dans l’air et distances à travers le matériau
d’étanchéité . 26
18 Résistance du matériau isolant à la chaleur anormale et au feu . 27
19 Résistance au cheminement . 27
20 Résistance à la corrosion . 27
21 Compatibilité électromagnétique (CEM) . 27
Annexe AA (informative) Exemples de boîtes/enveloppes de connexion . 29
Annexe BB (informative) Présentation schématique des dispositifs de connexion
comme base pour les définitions . 30

Figure 101 – Dispositif de connexion à une seule borne . 27
Figure 102 – Barrette de jonction . 28
Figure AA.1 – Quatre exemples de boîtes/enveloppes de connexion. 29
Figure BB.1 – Présentation schématique . 30

Tableau 101 – Relations entre la capacité de connexion assignée et le courant d'essai . 26
Tableau 102 — Lignes de fuite, distances d’isolement dans l’air et distances à travers
le matériau d’étanchéité . 26

+AMD1:2015 CSV  IEC 2015
COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
BOÎTES ET ENVELOPPES POUR APPAREILLAGE ÉLECTRIQUE
POUR INSTALLATIONS ÉLECTRIQUES FIXES
POUR USAGE DOMESTIQUE ET ANALOGUE –
Partie 22: Règles particulières concernant
les boîtes et enveloppes de connexion
AVANT-PROPOS
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