IEC 60309-2:1999+AMD1:2005+AMD2:2012 CSV

IEC 60309-2 ®
Edition 4.2 2012-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Plugs, socket-outlets and couplers for industrial purposes –
Part 2: Dimensional interchangeability requirements for pin and contact-tube
accessories
Prises de courant pour usages industriels –
Partie 2: Règles d'interchangeabilité dimensionnelle pour les appareils à
broches et alvéoles
IEC 60309-2:1999+A1:2005+A2:2012

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IEC 60309-2 ®
Edition 4.2 2012-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Plugs, socket-outlets and couplers for industrial purposes –

Part 2: Dimensional interchangeability requirements for pin and contact-tube

accessories
Prises de courant pour usages industriels –

Partie 2: Règles d'interchangeabilité dimensionnelle pour les appareils à

broches et alvéoles
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX CR
ICS 29.120.30 ISBN 978-2-88912-054-3

– 2 – 60309-2  IEC:1999+A1:2005
+A2:2012
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Definitions . 7
3 Normative references . 8
4 General . 8
5 Standard ratings . 8
6 Classification . 9
7 Marking . 9
8 Dimensions . 12
9 Protection against electric shock . 17
10 Provision for earthing . 17
11 Terminals and terminations . 17
12 Interlocks and retaining devices . 20
13 Resistance to ageing of rubber and thermoplastic material . 20
14 General construction . 21
15 Construction of socket-outlets . 22
16 Construction of plugs and connectors . 23
17 Construction of appliance inlets . 24
18 Degrees of protection . 25
19 Insulation resistance and dielectric strength . 25
20 Breaking capacity . 25
21 Normal operation . 25
22 Temperature rise . 26
23 Flexible cables and their connection . 26
24 Mechanical strength . 26
25 Screws, current-carrying parts and connections . 26
26 Creepage distances, clearances and distances through sealing compound . 26
27 Resistance to heat, fire and tracking . 26
28 Corrosion and resistance to rusting . 26
29 Conditional short-circuit current withstand test . 26
30 Electromagnetic compatibility . 26

Standards sheets . 54
Figures . 91
Annex AA (informative) List of the clause numbers that require re-testing . 105

Table 101 . 8
Table 102 . 12
Table 103-1 – General purpose accessories with rated voltage not exceeding 50 V . 13
Table 103-2 – Special application accessories with rated voltage not exceeding 50 V . 13
Table 104 . 14
Table 105 . 16

60309-2  IEC:1999+A1:2005 – 3 –
+A2:2012
Table 106 . 17
Table 107 – Size of connectable conductors . 19
Table 108 . 20
Table 109 . 21
Table 110 . 22
Table 111 . 23
Table 112 . 23

– 4 – 60309-2  IEC:1999+A1:2005
+A2:2012
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
PLUGS, SOCKET-OUTLETS AND COUPLERS
FOR INDUSTRIAL PURPOSES –
Part 2: Dimensional interchangeability requirements
for pin and contact-tube accessories

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
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2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international
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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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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 60309-2 has been prepared by subcommittee 23H: Industrial plugs
and socket-outlets, of IEC technical committee 23: Electrical accessories.
This part 2 shall be used in conjunction with part 1.
This consolidated version of IEC 60309-2 consists of the fourth (1999) [documents
23H/89/FDIS and 23H/92/RVD], its amendment 1 (2005) [documents 23H/175/FDIS and
23H/183/RVD] and its amendment 2 (2012) [documents 23H/275/FDIS and 23H/280/RVD].
The technical content is therefore identical to the base edition and its amendments and has
been prepared for user convenience.
It bears the edition number 4.2.
A vertical line in the margin shows where the base publication has been modified by
amendments 1 and 2.
60309-2  IEC:1999+A1:2005 – 5 –
+A2:2012
The committee has decided that the contents of the base publication and its amendments 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 – 60309-2  IEC:1999+A1:2005
+A2:2012
INTRODUCTION
This standard is divided into several parts:
Part 1: General requirements, comprising clauses of a general character.
Subsequent parts: Particular requirements dealing with particular types. The clauses of these
particular requirements supplement or modify the corresponding clauses in Part 1. Where the
text of subsequent parts indicates an "addition" to or a "replacement" of the relevant
requirement, test specification or explanation of Part 1, these changes are made to the
relevant text of Part 1, which then becomes part of the standard. Where no change is
necessary, the words "This clause of Part 1 is applicable" are used.

60309-2  IEC:1999+A1:2005 – 7 –
+A2:2012
PLUGS, SOCKET-OUTLETS AND COUPLERS
FOR INDUSTRIAL PURPOSES –
Part 2: Dimensional interchangeability requirements for
pin and contact-tube accessories

1 Scope
Replacement:
This standard applies to plugs and socket-outlets, cable couplers and appliance couplers with
a rated operating voltage not exceeding 1 000 V, 500 Hz and a rated current not exceeding
125 A, primarily intended for industrial use, either indoors or outdoors.
NOTE All references for accessories with a rated current of more than 125 A in part 1 are not applicable to this
part 2.
This standard applies to plugs and socket-outlets, cable couplers and appliance couplers with
pins and contact tubes of standardized configurations.
This standard applies to plugs and socket-outlets, cable couplers and appliance couplers,
hereinafter referred to as accessories, for use when the ambient temperature is normally
within the range –25 °C to 40 °C.
The use of these accessories on building sites and for agricultural, commercial and domestic
applications is not precluded.
This standard applies to accessories with screwless type terminals or insulation piercing
terminals, with a rated current up to and including 32 A for series I and 30 A for series II.

Socket-outlets or appliance inlets incorporated in or fixed to electrical equipment are within
the scope of this standard. This standard also applies to accessories intended to be used in
extra-low voltage installations.
NOTE This standard does not apply to accessories primarily intended for domestic and similar general purposes.
In locations where special conditions prevail, for example on board ship or where explosions are liable to occur,
additional requirements may be necessary.
2 Definitions
This clause of part 1 is applicable except as follows:
Additional subclause:
2.101
phase inverter
a plug or an appliance inlet with operating means to interchange the position of two phase
pins without disconnecting them from the conductors

– 8 – 60309-2  IEC:1999+A1:2005
+A2:2012
3 Normative references
This clause of part 1 is applicable except as follows:
Addition:
IEC 60364-4-41, Low-voltage electrical installations – Part 4-41: Protection for safety –
Protection against electric shock
IEC 60617-2:1996, Graphical symbols for diagrams – Part 2: Symbol elements, qualifying
symbols and other symbols having general application
4 General
This clause of part 1 is applicable except as follows:
4.1 The last paragraph of this subclause of Part 1 is not applicable.
See Amendment 1 of IEC 60309-1.
Additional subclause:
4.101 If gauges are used, they shall be of hardened steel, all corners shall be slightly
rounded-off with a maximum radius of 0,1 mm, and the surface finish for all measurement
N8
surfaces shall be min., if not otherwise specified.
In this standard:
covers both 2P + and 1P + N + and
2P +
3P + covers both 3P + and 2P + N +
unless specifically excluded (see Table 104).

5 Standard ratings
This clause of part 1 is applicable except as follows:
5.2 Replacement:
Standard rated currents are given in Table 101.
Table 101
Series I Series II
A A
16 20
32 30
63 60
125 100
5.101 The standard IP ratings according to IEC 60529 are:
– IP44,
– IP67,
– IP66/IP67.
60309-2  IEC:1999+A1:2005 – 9 –
+A2:2012
6 Classification
This clause of part 1 is applicable except as follows:
6.1.2 This clause of Part 1 is applicable.
7 Marking
This clause of part 1 is applicable except as follows:
7.1 Modification:
Delete the note
Addition:
The symbol indicating the position of the earthing contact or of the minor key or keyway shall
be placed before or above the figure for the rated operating voltage, and separated from it by
a line.
These markings shall be placed after that for rated current, separated from it by a dash if an
oblique line separates the symbol indicating the position of the earthing contact or of the
minor key or keyway from the figure for the rated operating voltage.
If a symbol for nature of supply is used, it shall be placed next to or below the marking for
rated operating voltage.
For three-phase accessories it is not necessary to mark the voltage phase to neutral, if any.
The marking for rated current(s), position of the earthing contact or the minor key, keyway,
rated operating voltage(s) and nature of supply accordingly may be as follows:
For series I:
9 h
16 A - 9 h/400 V~, or 16 - 9 h/400~, or 16 - , or
400 ~
9 h
16 A - 9 h/380-415 V~, or 16 - 9 h/380-415~, or 16 -
380 - 415 ~
6 h
32 A - 6 h/230/400 V~, or 32 - 6 h/230/400~, or 32 - , or
230 / 400 ~
6 h
6 h / 220 / 380 V ~ 6 h / 220 / 380 ~
32 A - , or 32 - , or 32 -
220 / 380 ~
240 / 415 V ~ 240 / 415 V ~
240 / 415 ~
– 10 – 60309-2  IEC:1999+A1:2005
+A2:2012
For series II
7 h
20 A - 7 h/480 V a.c. or 20 A - 7 h/480~, or 20 A -
480 ~
7 h
30 A - 7 h/480 V, 3 Phase, or 30 A - 7 h/480, 3Φ, or 30 A -
480 V, 3Φ
7 h
60 A - 7 h/277/480 V, 3 Phase Y, or 60 A - 7 h/277/480, 3ΦY, or 60 A -
277 / 480 V, 3Φ Y
It is allowed to put the symbols for a.c. (~) and d.c. ( or ) after the values (IEC 60617-2).
The drawings of standard sheets 2-I, 2-II, 2-III and 2-lV show accessories with the symbol 6 h
and those of standard sheets 2-VIII and 2-lX accessories with the symbol 12 h.
For accessories having rated operating voltages exceeding 50 V, the symbol indicating the
position of the earthing contact shall be a numeral followed by the letter h.
The numeral is derived from the position of the earth contact tube, when compared with the
face of a clock, the socket-outlet or connector being viewed from the front with the keyway at
the sixth hour.
For accessories having rated operating voltages not exceeding 50 V, the symbol indicating
the position of the minor key shall be a numeral followed by the letter h.
The numeral is derived from the position of the minor key, when compared with the face of a
clock, the socket-outlet or connector being viewed from the front with the major key at the
sixth hour.
For plugs and appliance inlets, the symbol indicating the position of the earthing contact or
the minor keyway shall be the same as that for the corresponding socket-outlet or connector.
Contact tubes of socket-outlets and connectors shall be positioned in the clockwise order
when viewed from the front as shown in the standard sheets (see also 7.5).
Pins of plugs and appliance inlets shall be positioned in the opposite order viewed from the
front.
7.2 This clause of Part 1 is applicable.
7.4 Replacement
For plugs and connectors, the marking specified in 7.1 shall be easily discernible when the
accessory is wired ready for use.
The marking for insulation voltage shall be on the main part; it shall not be visible when the
accessory is mounted and wired as in normal use.
NOTE 1 The term "ready for use" does not imply that the plug or connector is engaged with its complementary
accessory.
NOTE 2 The term "main part" of a plug or a connector means the part carrying the contacts.
Compliance is checked by inspection.

60309-2  IEC:1999+A1:2005 – 11 –
+A2:2012
7.5 Replacement
For rewirable accessories, the contacts shall be indicated by the following symbols.
– for accessories with three contacts (phase + neutral + earth, or, phase + phase + earth):
L / +, unmarked, or
except for Series II clock position 4 h and 5 h which are marked:
N, unmarked, or
– for accessories with four contacts (three phase + earth):
L1, L2, L3, or or alternatively 1, 2, 3, or
except for Series II clock position 12 h (phase + centre tap + phase + earth) which is
marked:
L1, N, L2, or
– for accessories with five contacts (three phase + neutral + earth):
L1, L2, L3, N, or or alternatively 1, 2, 3, N or
– for a period of time the marking R1, S2, T3 may be used instead of L1, L2, L3.
– for accessories having a rated operating voltage not exceeding 50 V, 8 h clock position for
portable electric incubator : +12, +24.
These symbols shall be placed close to the relevant terminals; they shall not be placed on
screws, removable washers or other removable parts.
For phase inverters these symbols shall conform in one position with the requirements of 7.1.
In the other position of the inverting means, the phase marking need not conform.
NOTE The terminals for pilot conductors are not required to be indicated.
The figures used with the letters may be written as an index. It is recommended that where practicable the
symbol be used.
Compliance is checked by inspection.
7.7 Modification:
This subclause of part 1 is applicable except for the following addition:
Add:
The 2P + N + earth, 12 h, Series II accessories shall use the indicating colour orange.

– 12 – 60309-2  IEC:1999+A1:2005
+A2:2012
8 Dimensions
This clause of part 1 is applicable except as follows:
8.1 Replacement:
Accessories shall comply with the relevant standard sheets as specified below:
– accessories having rated operating voltages exceeding 50 V:
• 16/20 A and 32/30 A: . Sheets 2-I and 2-II;
• 63/60 A and 125/100 A, without pilot contact:. Sheets 2-III and 2-IV;
• 63/60 A and 125/100 A, with pilot contact: . Sheets 2-IIIa and 2-IVa;
• mechanical interlock for 16 A to 125 A accessories . Sheet 2-V
– accessories having rated operating voltage not exceeding 50 V:
16/20 A and 32/30 A: .… Sheets 2-VIII and 2-IX.
Deviations from the dimensions specified in the standard sheets may be made, but only if
they provide a technical advantage and do not adversely affect the purpose and safety of the
accessories complying with the standard sheets, especially with regard to interchangeability
and non-interchangeability.
Compliance is checked by means of gauges or by measurement for those dimensions not
covered by gauges,
– for accessories having rated operating voltages exceeding 50 V according to:
• Figures 101 and 102 for socket-outlets and connectors;
• Figures 107 and 108 for plugs and appliance inlets;
– for accessories having rated operating voltages not exceeding 50 V according to:
• Figures 110 and 112 for 16/20 A and 32/30 A accessories.
The gauges shall be moved axially to the centre line of the accessory with a force as shown in
the Table 102, applied for 1 min.
Table 102
Rated current
Rated operating Force (max.) for Force (max.) for
voltage "GO" gauge "NOT GO" gauge
A
N ( )
V Series I Series II N
−1
Not exceeding 50 V 16 20 150 30
32 30 150 30
Exceeding 50 V 16 20 60 20
32 30 90 30
63 60 165 55
125 100 240 80
Before the test, the test specimen of insulating material shall be stored at a temperature of
(20 ± 5) °C and a relative humidity between 45 % and 75 % for four weeks.
For accessories having rated operating voltages not exceeding 50 V, the position of the minor
key or keyway shall be as shown in Tables 103-1 or 103-2

60309-2  IEC:1999+A1:2005 – 13 –
+A2:2012
For accessories having rated operating voltages exceeding 50 V, the position of the earthing
contact shall be as shown in Table 104.
Compliance is checked by inspection.
Table 103-1 – General purpose accessories with rated voltage
not exceeding 50 V
Rated operating
Frequency Minor key or
voltage
keyway position*
V Hz
20 to 25 50 and 60 No minor key or keyway
40 to 50 50 and 60 12
100 up to and including 200 4
20 to 25 300 2
and 400 3
40 to 50 Over 400 up to and including 500 11
Direct current 10
*  The minor key or keyway position is indicated by the relevant number (see 7.1).

Table 103-2 – Special application accessories with rated voltage not exceeding 50 V
Rated Minor key or
Numbers of
operating Rated current Other characteristics and application keyway
poles
voltage position *
Portable electric incubators – use at 12 V d.c. or
25 V 32 A 3 8
24 V d.c. on ambulances or helicopters
* The minor key or keyway is indicated by the relevant number.

Positions 1 and 9 are reserved for future standardisation. For constructional reasons,
positions 5, 6 and 7 cannot be used.

– 14 – 60309-2  IEC:1999+A1:2005
+A2:2012
Table 104
Number of Accessories earthing-
Type Frequency Rated operating voltage
contacts a
contact position
16/20 A 63/60 A
Hz V
32/30 A 125/100 A
1P+N+ 50 and 60 100 to 130 4 4
Series II 60 277 5 5
100 to 130 4 4
50 and 60
200 to 250 6 6
380 to 415 9 9
50 and 60 480 to 500 7 7
3 contacts Supply from an isolating 12 12
2P+
transformer
Series I
and II
100 up to and Over 50 10 10
including 300
Over 300 up to Over 50 2 2
and including 500
d 3 3
Over 50 up to and including 250
Direct current
Over 250 8 8
2P+N+ 50 and 60 125/250 12 12
single-phase
Series II
Series I 50 and 60 Supply from an isolating 12 12
transformer
7100 to 130 4 4
50 and 60 200 to 250 9 9
380 to 415 6 6
60 b 11 11
440 to 460
4 contacts 3P+ 480 to 500 7 7
50 and 60
Series I 600 to 690 5 5
and II
50 380 3 3
60 c
50 and 60 1000 - 8
100 up to and Over 50 10 10
including 300
Over 300 up to Over 50 2 2
and including 500
57/100 to 75/130 4 4
120/208 to 144/250 9 9
50 and 60 200/346 to 240/415 6 6
277/480 to 288/500 7 7
5 contacts 3P+N+ 347/600 to 400/690 5 5
Series I 60 b 11 11
250/440 to 265/460
and II
50 220/380 3 3
60 c
250/440
60309-2  IEC:1999+A1:2005 – 15 –
+A2:2012
Table 104 (2 of 2)
Number of Accessories earthing-
Type Frequency Rated operating voltage
contacts a
contact position
16/20 A 63/60 A
Hz V
32/30 A 125/100 A
50 and 60 Supply from an isolating 12 12
transformer
100 up to and Over 50 10 10
including 300
Over 300 up to Over 50 2 2
and including 500
All types All rated operating voltage and/or frequencies 1 1
not covered by other configurations.
This clock counter position can additionally be used in
special applications where a distinction to
standardized positions is needed

NOTE The positions shown by a dash (–) are not standardized.

a The earthing-contact position is indicated by the relevant numeral (see 7.1).
b
Mainly for marine installations.
c
Only for refrigerated containers (standardized ISO).
d
This configuration is required to have an earthing contact because it covers voltages above the upper limits of
ELV (d.c.) according to IEC 60364-4-41.

8.2 Replacement:
For accessories having rated operating voltages exceeding 50 V, it shall not be possible to
engage plugs or connectors with socket-outlets or appliance inlets having different ratings, or
having different contact combinations.
In addition, for all accessories the design shall be such that improper connections shall not be
possible between:
– the earth and/or pilot plug-contact and a live socket-contact, or a live plug-contact and the
earth and/or pilot socket-contact;
– the phase plug-contacts and the neutral socket-contact, if any;
– the neutral plug-contact and a phase socket-contact.
Compliance is checked by inspection, with the following exception:
For the two last indents, compliance is not required between three contacts accessories
Series I and II, 4 h, since these have reciprocal contact positions.
NOTE These conflicting versions have both been in use for many years and resolution of this problem has been
found to be impractical.
It shall not be possible to engage plugs with socket-outlets or connectors having different
earthing-contact positions or minor key positions.
Compliance is checked by inspection and tests using the methods indicated below. These
tests are made after storage of test specimens of insulating material at a temperature of
(20 ± 5) °C and with relative humidity between 45 % and 75 % for four weeks.
For accessories having thermoplastic housing, this test is made at a temperature of (35 ± 2) °C,
both the accessories and the gauges being at this temperature.

– 16 – 60309-2  IEC:1999+A1:2005
+A2:2012
a) Checking plugs and appliance inlets
For plugs and appliance inlets with rated operating voltage exceeding 50 V, gauges
according to Figure 109 are used.
For plugs and appliance inlets with rated operating voltage not exceeding 50 V, gauges
according to Figure 113 are used.
First test (key)
The socket-gauge shown in Figure 109 is placed before the plug in such a way that during
the test the key shall hit the lower part of the shroud of the gauge approximately in the
middle.
The force F is slowly increased in such a way that the total force given in Table 105 is
exerted after 15 s. After that the full force is applied for 1 min.
The forces used are given in Table 105.
Table 105
Rated current
A 16/20 32/30 63/60 125/100
Series I/II
Force F N 175 210 385 560
When the force is applied the gauge is not permitted to move more than 4 mm in relation to
the shroud of the plug or appliance inlet.
After the test, the plug and appliance inlet shall not be damaged in such a way that
impairs further use of the accessory.
These forces are equal to 1,4 times the corresponding withdrawal forces.
Second test (earth-pin)
The force F shall be applied to the earth-pin in the same manner and for the same
duration as in the previous test.
After that test, the plug and appliance inlet shall comply with the relevant standard sheet.
b) Checking socket-outlets and connectors
For socket-outlets and connectors having rated operating voltages exceeding 50 V,
gauges according to Figure 104 are used.
For socket-outlets and connectors having rated operating voltages not exceeding 50 V,
gauges according to Figure 111 are used.
First test (shroud)
The first test is carried out on all different clock positions, except for the one
corresponding to the socket-outlet or connector to be used.
The test specimen shall be fixed and supported in such a way that the rigidity of the
socket-outlet or connector is not influenced.
Arrangement for test shall be according to Figure 103.
The gauge shown in Figure 104 shall hit two opposite points of the accessory at the same
time. The axis of the gauge and of the accessory shall be approximately parallel and the
chamfer shall be equally divided in both sides.
The force F is slowly increased in such a way that the total force given in Table 105 is
exerted after 15 s. After that the full force is applied for 1 min.
When the force is applied, the gauge is not permitted to move more than 4 mm in relation
to the shroud of the socket-outlet or connector.
After the test, the socket-outlet of the connector shall not be damaged to the extent of
impairing the further use of the accessory.
Second test (holes)
For the second test, the gauge shown in Figure 105 is inserted in each phase hole.

60309-2  IEC:1999+A1:2005 – 17 –
+A2:2012
The gauge shall not enter the phase hole by a greater distance than that shown in
Table 106 measured from the front of the internal part (see Figure 106).
The same forces and duration and the same method of application are used as for the
previous test.
Table 106
Rated current
A 16/20 32/30 63/60 125/100
Series I/II
Distance X mm 11 12,5 15 20
8.3 Addition:
Compliance is checked by manual test and, for accessories with enclosures of resilient or
thermoplastic material, by means of the gauge shown in Figure 114.
The gauge is applied with a force of 200 N for 1 min. For accessories with enclosures of
thermoplastic material the gauge is applied at a temperature of (35 ± 2) °C, both the
accessories and the gauge being at this temperature.
NOTE For accessories of rigid material, such as metal, thermosetting resins, ceramic material and the like,
conformity to the relevant standard sheets ensures compliance with this requirement.

9 Protection against electric shock
This clause of part 1 is applicable except as follows:
9.1 Addition:
Conformity with the relevant standard sheets ensures compliance with the requirement as far
as inaccessibility of contacts during insertion of a plug or connector into the complementary
accessories is concerned.
9.2 Addition:
Conformity with the relevant standard sheets ensures compliance with these requirements.
10 Provision for earthing
This clause of part 1 is applicable.
11 Terminals and terminations
This clause of Part 1 is applicable except as follows:
11.2.1 Addition:
Screw type terminals may be identified by the terminal sizes given in the Table 107.
NOTE For screw type terminals not identified by terminal sizes given in the Table 107, Part 1 is applicable.
Screw type terminals identified by terminal sizes shall comply with standard sheets as
specified in 11.101 of this standard and are not subject to test as in 11.5 of Part 1.

– 18 – 60309-2  IEC:1999+A1:2005
+A2:2012
Add the following new subclause:
11.101 Screw type terminals identified by terminal sizes
11.101.1 Terminals shall comply with the standard sheets as specified below, except those
for standard sheets 2-X, 2-XI and 2-XII. For these standard sheets, the length of thread in the
fixed part or nut and the length of thread on the screw or stud may be reduced, if the
mechanical strength of the terminal is adequate and at least two full threads of every
clamping screw are in engagement when a conductor of the most unfavourable cross-
sectional area is clamped.
Standard sheet 2-X applies to pillar terminals.
Standard sheet 2-XI applies to screw terminals and stud terminals.
Standard sheet 2-XII applies to saddle terminals.
Standard sheet 2-XIII applies to lug terminals.
Mantle terminals shall comply with standard sheet 2-X with regard to the dimensions D and e.
Terminals which are essentially of the pillar type, but with the part with the hole for the
conductor slotted to enable the conductor to be moved laterally into position, shall comply
with standard sheet 2-X. Anyhow, the maximum gap between the conductor restraining parts
on the side where the slot is located shall comply with standard sheet 2-XI.
If the required length of thread in a terminal screw hole is obtained by plunging, the edge of
the extrusion shall be reasonably smooth and the length of the thread shall exceed the
specified minimum value by at least 0,5 mm.
Compliance is checked by inspection, by measurement and, for terminals with a reduced
length of thread, by test of 11.101.2.
The maximum gap between the conductor restraining parts is checked by means of a steel
gauge pin with a diameter equal to e ± 0,05 mm.
For terminals without pressure plate(s) or the like, complying with standard sheet 2-X, the
clamping screw is screwed fully home without a conductor in position. It shall not then be
possible to insert the gauge pin between the threaded part of the screw and the wall of the
conductor space.
For terminals complying with standard sheet 2-XI, and for terminals with a pressure plate or
the like complying with standard sheet 2-X, where it is not appropriate to insert the gauge pin
in all positions, a conductor is clamped in the terminal.
For terminals complying with standard sheet 2-X, the conductor is in the form of a rod with a
diameter equal to that corresponding to the middle cross-sectional area of the range specified
for the particular terminal, and having a flat end perpendicular to the axis.
For terminals complying with standard sheet 2-XI, the conductor is solid and has a diameter D
as specified in this standard sheet.
With this conductor in position, it shall not be possible to insert the gauge pin, applied in a
direction parallel to the axis of the conductor, into any gap through which a wire of a stranded
conductor might escape.
The minimum distance between the clamping screw and the end of the conductor, when fully
inserted, is specified in standard sheet 2-X. It is checked by means of the rod conductor
specified above, which shall pass into the conductor space for a distance, beyond the
threaded hole, at Ieast equal to the minimum distance specified.
For terminals with pressure plate(s) complying with standard sheet 2-X, the gauge pin is
applied to the gap between the pressure plate and the wall of the conductor space.

60309-2  IEC:1999+A1:2005 – 19 –
+A2:2012
The following negative deviations from the specified values are allowed for the minimum
nominal thread diameter of the screw:
– 0,15 mm for screws with a nominal diameter not exceeding 5 mm;
– 0,22 mm for screws with a nominal diameter over 5 mm but not exceeding 10 mm;
– 0,27 mm for screws with a nominal diameter of over 10 mm.
This subclause does not exclude terminals of types other than those shown in the standard
sheets. Such terminals shall, however, comply with the other requirements of this clause as
far as is reasonable, and it may be necessary to formulate additional requirements.
If the thread in the fixed part or nut is recessed, the total length of the shank of headed
screws shall be increased accordingly.
If one or more of the dimensions are larger than the minimum values specified in the standard
sheets, the other dimensions need not be correspondingly increased, but departures from the
specified values shall not impair the function of the terminal.
11.101.2 Terminals complying with standard sheet 2-X, but with a reduced length of thread,
are fitted with a conductor of the smallest cross-sectional area specified in Table 107, tightly
clamped, or a conductor of the largest cross-sectional area specified in this table, lightly
clamped, whichever is the most unfavourable.
Table 107 – Size of connectable conductors
1)
Rating of the accessory
Internal connection
Flexible cables for plugs
External earthing
2)
and connectors
Voltage Current connection if any
Solid or stranded cables
2) 6)
for socket-outlets
Solid or stranded
V A
cables for appliance
2)
inlets
Series Series Series Series Terminal Series Series Terminal Series Series Termin

size al
I II I II I II I II
size
size
2 2 2 AWG/
mm AWG/ mm AWG/ mm
3)
3) 3) MCM
MCM MCM
Not 16 20 4 to 10 12 to 8 6 4 to 10 12 to 8 5
exceeding
32 30 4 to 10 12 to 8 6 4 to 10 12 to 8 5
...