IEC 61184:2008

IEC 61184 ®
Edition 3.1 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Bayonet lampholders
Douilles à baïonnette
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IEC 61184 ®
Edition 3.1 2011-07
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
colour
inside
Bayonet lampholders
Douilles à baïonnette
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX CR
ICS 29.140.10 ISBN 978-2-88912-608-8

– 2 – 61184  IEC:2008+A1:2011
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 General . 7
1.1 Scope . 7
1.2 Normative references . 7
2 Terms and definitions . 8
2.1 Materials . 8
2.2 Means of fixing . 8
3 General requirements . 12
4 General conditions for tests . 12
5 Standard ratings . 13
5.1 Standard rated voltage . 13
5.2 Standard rated currents . 14
6 Classification . 14
7 Marking . 15
8 Dimensions . 17
9 Protection against electric shock . 18
10 Terminals . 19
11 Provision for earthing . 21
12 Construction . 23
13 Switched lampholders. 27
14 Moisture resistance, insulation resistance and electrical strength . 28
15 Mechanical strength . 30
16 Screws, current-carrying parts and connections . 34
17 Creepage distances and clearances . 34
18 General resistance to heat. 36
19 Resistance to heat, fire and tracking . 40
20 Resistance to excessive residual stresses (season cracking) and to rusting . 42

Annex A (normative) Season cracking/corrosion test . 63
Bibliography . 65

Figure 1 – Loading device (see 15.1) . 44
Figure 2 – Bending apparatus (see 15.4) . 45
Figure 3 – Gauge for holes for backplate lampholders screws (see 12.11) . 46
Figure 4 – Clarification of some of the definitions in Clause 2 . 47
Figure 5 – Test cap B15d (see 18.3) . 48
Figure 6 – Test cap B22d (see 18.3) . 49
Figure 7 – Testing device (see 9.1) . 50
Figure 8 – Dimensions for shade support devices (see 8.1) . 51
Figure 9 – Dimensions for protective shields for B22d lampholders (see 9.1) . 52

61184  IEC:2008+A1:2011 – 3 –
Figure 10 – Test cap B15d (see 14.3) . 53
Figure 11 – Test cap B22d (see 14.3) . 54
Figure 12 – Typical apparatus for the heating test (see 18.5) . 55
Figure 13 – Nipple thread for lampholders – Basic profile and design profile for the nut
and for the screw . 57
Figure 14 – Gauges for metric ISO thread for nipples . 60
Figure 15 – Impact-test apparatus . 61
Figure 16 – Mounting support . 61
Figure 17 – Ball-pressure test apparatus . 62
Figure 18 – Pressure apparatus . 62

Table 1 – Dimensions of threaded entries and set screws . 18
Table 2 – Minimum dimensions of pillar type terminals . 20
Table 3 – Limits for contact forces . 23
Table 4 – Pull and torque values . 26
Table 5 – Heights of fall . 32
Table 6 – Maximum deformation values . 33
Table 7 – Torque values . 34
Table 8 – Minimum distances for a.c. (50/60 Hz) sinusoidal voltages – Impulse
withstand category II . 35
Table 9 – Heating cabinet temperature . 36
Table 10 – Heating cabinet temperature . 37
Table 11 – Test temperature and test lamp data . 39
Table A.1 – Ph adjustment . 63

– 4 – 61184  IEC:2008+A1:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
BAYONET LAMPHOLDERS
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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This consolidated version of IEC 611843 consists of the third edition (2008) [documents
34B/1385/FDIS and 34B/1401/RVD, its amendment 1 (2011) [documents 34B/1587/FDIS and
34B/1599/RVD] and its corrigendum of February 2009. It bears the edition number 3.1.
The technical content is therefore identical to the base edition and its amendment and
has been prepared for user convenience. A vertical line in the margin shows where the
base publication has been modified by amendment 1. Additions and deletions are
displayed in red, with deletions being struck through.

61184  IEC:2008+A1:2011 – 5 –
International Standard IEC 61184 has been prepared by subcommittee 34B: Lamp caps and
holders, of IEC technical committee 34: Lamps and related equipment.
In this edition, information to lampholders intended to be used in applications where they are
accessible in normal use (class II as well as class I luminaires) are introduced. Additionally, in
Table 11, lamp data where lamps no longer exist has been removed and requirements for
shade holder rings have been amended to include shade rings according to IEC 60399 into
testing.
In this standard, the following print types are used:
– requirements proper: in roman type;
– test specifications: in italic type;
– notes: in small roman type.
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.
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 publication using a colour printer.

– 6 – 61184  IEC:2008+A1:2011
INTRODUCTION
This standard covers safety requirements for bayonet lampholders and includes references to
IEC 60061 for the control of interchangeability and safety of the cap and holder fit.
NOTE Safety requirements ensure that electrical equipment constructed in accordance with these requirements
does not endanger the safety of persons, domestic animals or property when properly installed and maintained and
used in applications for which it was intended.
The thermal characteristics of lampholders are specified by the rated operating temperature
(symbol T), which is the highest temperature for which the lampholder is designed. The
temperature rating and the resistance to heat specified in this standard are based on two
different principles, as presently found in IEC 60238 for Edison screw lampholders and in
other national standards for bayonet lampholders. After experience, it may be possible to
rationalize the systems in future editions of this standard.

61184  IEC:2008+A1:2011 – 7 –
BAYONET LAMPHOLDERS
1 General
1.1 Scope
This International Standard applies to bayonet lampholders B15d and B22d for connection of
lamps and semi-luminaires to a supply voltage of 250 V.
This standard also covers lampholders which are integral with a luminaire or intended to be
built into appliances. It covers the requirements for the lampholder only.
For all other requirements, such as protection against electric shock in the area of the
terminals, the requirements of the relevant appliance standard shall be observed and tested
after building into the appropriate equipment, when that equipment is tested according to its
own standard. Lampholders for use by luminaire manufacturers only are not for retail sale.
NOTE Where lampholders are used in luminaires, their maximum operating temperatures are specified in
IEC 60598-1.
B15d denotes the cap/holder fit as defined by IEC 60061-1, sheet 7004-11 and IEC 60061-2,
sheet 7005-16 with the corresponding gauges.
B22d denotes the cap/holder fit as defined by IEC 60061-1, sheet 7004-10 and IEC 60061-2,
sheet 7005-10 with the corresponding gauges.
1.2 Normative references
The following referenced documents are indispensable for the application of this document.
For dated references, only the edition cited applies. For undated references, the latest edition
of the referenced document (including any amendments) applies.
IEC 60061 (all parts), Lamp caps and holders together with gauges for the control of
interchangeability and safety
IEC 60061-1, Lamp caps and holders together with gauges for the control of
interchangeability and safety – Part 1: Lamp caps
IEC 60061-2, Lamp caps and holders together with gauges for the control of
interchangeability and safety – Part 2: Lampholders
IEC 60061-3, Lamp caps and holders together with gauges for the control of
interchangeability and safety – Part 3: Gauges
IEC 60064, Tungsten filament lamps for domestic and similar general lighting purposes –
Performance requirements
IEC 60068-2-75:1997, Environmental testing – Part 2-75: Tests – Test Eh: Hammer tests
IEC 60112:2003, Method for the determination of the proof and the comparative tracking
indices of solid insulating materials
IEC 60227 (all parts), Polyvinyl chloride insulated cables of rated voltages up to and including
450/750 V
– 8 – 61184  IEC:2008+A1:2011
IEC 60245 (all parts), Rubber insulated cables – Rated voltages up to and including
450/750 V
IEC 60399, Barrel thread for lampholders with shade holder ring
IEC 60417, Graphical symbols for use on equipment
IEC 60432 (all parts), Incandescent lamps – Safety specifications
IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
IEC 60598-1, Luminaires – Part 1: General requirements and tests
IEC 60664-1:2007, Insulation coordination for equipment within low-voltage systems – Part 1:
Principles, requirements and tests
IEC 60695-2-11:2000, Fire hazard testing – Part 2-11: Glowing/hot-wire based test methods –
Glow-wire flammability test method for end-products
IEC 60695-11-5:2004, Fire hazard testing – Part 11-5: Test flames – Needle-flame test
method – Apparatus, confirmatory test arrangement and guidance
ISO 4046-4:2002, Paper, board, pulps and related terms – Vocabulary – Part 4: Paper and
board grades and converted products
2 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
NOTE For clarification of some definitions, see also Figure 4.
2.1 Materials
2.1.1
plastic lampholder
lampholder, the exterior of which is made wholly of plastic material
NOTE The exterior is any part of the lampholder which, when wired and fully assembled and fitted with the testing
device shown in Figure 7, can be touched directly by the standard test finger of IEC 60529.
2.1.2
ceramic lampholder
lampholder, the exterior of which is made wholly of ceramic material (see note to 2.1.1)
2.1.3
metal lampholder
lampholder, the exterior of which is made wholly or partly of metal (see note to 2.1.1)
2.2 Means of fixing
2.2.1
cord grip lampholder
lampholder incorporating a method of retaining a flexible cord by which it may be suspended
(see Figure 4a)
61184  IEC:2008+A1:2011 – 9 –
2.2.2
threaded entry lampholder
lampholder incorporating a threaded component at the point of entry of the supply wires
permitting the lampholder to be mounted on a mating threaded support (formerly called nipple
lampholder) (see Figure 4b)
2.2.3
backplate lampholder
lampholder so designed as to be suitable for mounting, by means of an associated or integral
backplate, directly on to a supporting surface or appropriate box (see Figure 4c)
2.3
terminal/contact assembly
part or assembly of parts which provides a means of connection between the termination of a
supply conductor and the contact-making surfaces of the corresponding lamp cap as well as
resilient means to maintain contact pressure
a) rising type, where the terminal is allowed to rise parallel with the lamp axis on insertion of
a lamp cap;
b) non-rising type, where the terminal is not allowed to rise on insertion of a lamp cap
NOTE The terminal and the barrel may be a unique element.
2.4
union ring
cylindrical component which joins together separate external parts of the lampholder
2.5
shade ring
cylindrical component having an internal thread or other means to engage a corresponding
support on the outer shell and intended to carry or retain a shade
2.6
skirt (plastic lampholders only)
component similar to a shade ring but having a longer cylindrical form to extend to the full
length of the lampholder body
2.6.1
protective shield (plastic lampholders only)
component similar to a skirt but having a flared open end to protect the user from accidental
contact with the lamp cap (see Figure 9)
2.7
dome
part of a cord grip lampholder or threaded entry lampholder which shields the connecting
terminals
2.8
barrel
part of a lampholder which serves for mechanical connection of the lamp cap with the
lampholder
2.9
lampholder for building-in
lampholder designed to be built into a luminaire, an additional enclosure or the like

– 10 – 61184  IEC:2008+A1:2011
2.9.1
unenclosed lampholder
lampholder for building-in so designed that it requires additional means, for example
enclosures, to meet the requirements of this standard with regard to protection against
electric shock
2.9.2
enclosed lampholder
lampholder for building-in so designed that, on its own, it fulfils the requirements of this
standard with regard to protection against electric shock and, if appropriate, IP classification
2.10
independent lampholder
lampholder so designed that it can be mounted separately from a luminaire and at the same
time provide all the necessary protection according to its classification and marking
2.11
switched lampholder
lampholder provided with an integral switch to control the supply to the lamp
2.12
basic insulation
insulation applied to live parts to provide basic protection against electric shock
NOTE Basic insulation does not necessarily include insulation used exclusively for functional purposes.
2.13
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
2.14
double insulation
insulation comprising both basic insulation and supplementary insulation
2.15
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
NOTE The term "insulation system" does not imply that the insulation must be one homogeneous piece. It may
comprise several layers which cannot be tested singly as supplementary or basic insulation.
2.16
live part
conductive part which may cause an electric shock in normal use
The neutral conductor is, however, regarded as a live part.
The test to determine whether or not a conductive part is a live part which may cause an
electric shock is given in Annex A of IEC 60598-1.
2.17
type test
test or series of tests made on a type test specimen for the purpose of checking compliance
of the design of a given product with the requirements of the relevant standard

61184  IEC:2008+A1:2011 – 11 –
2.18
type test sample
sample consisting of one or more similar specimens submitted by the manufacturer or
responsible vendor for the purpose of a type test
2.19
semi-luminaire
unit similar to a self-ballasted lamp but designed to utilize a replaceable light source and/or
starting device
2.20
rated operating temperature
highest temperature for which the lampholder is designed
2.21
rated pulse voltage
highest peak of pulse voltages that the holder is able to withstand
2.22
impulse withstand category
numeral defining a transient overvoltage condition
NOTE Impulse withstand categories I, II, III and IV are used.
a) Purpose of classification of impulse withstand categories
Impulse withstand categories are to distinguish different degrees of availability of equipment with regard to
required expectations on continuity of service and on an acceptable risk of failure.
By selection of impulse withstand levels of equipment, insulation co-ordination can be achieved in the whole
installation reducing the risk of failure to an acceptable level providing a basis for overvoltage control.
A higher characteristic numeral of an impulse withstand category indicates a higher specific impulse withstand of
the equipment and offers a wider choice of methods for overvoltage control.
The concept of impulse withstand categories is used for equipment energized directly from the mains.
b) Description of impulse withstand categories
Equipment of impulse withstand category I is equipment which is intended to be connected to the fixed electrical
installations of buildings. Protective means are taken outside the equipment - either in the fixed installation or
between the fixed installation and the equipment - to limit transient overvoltages to the specific level.
Equipment of impulse withstand category II is equipment to be connected to the fixed electrical installations of
buildings.
Equipment of impulse withstand category III is equipment which is part of the fixed electrical installations and other
equipment where a higher degree of availability is expected.
Equipment of impulse withstand category IV is for use at or in the proximity of the origin of the electrical
installations of buildings upstream of the main distribution board.
2.23
primary circuit
circuit which is directly connected to the AC mains supply
It includes, for example, the means for connection to the AC mains supply, the primary
windings of transformers, motors and other loading devices.

– 12 – 61184  IEC:2008+A1:2011
2.24
secondary circuit
circuit which has no direct connection to a primary circuit and derives its power from a
transformer, converter or equivalent isolation device, or from a battery
Exception: autotransformers. Although having direct connection to a primary circuit, the
tapped part of them is also deemed to be a secondary circuit in the above sense.
NOTE Mains transients in such a circuit are attenuated by the corresponding primary windings. Also inductive
ballasts reduce the mains transient voltage height. Therefore, components located after a primary circuit or after an
inductive ballast can be suited for an impulse withstand category of one step lower, i.e. for impulse withstand
category II.
2.25
enclosed reinforced insulated lampholder
lampholder for building-in, so designed that on its own it fulfils the requirements for double or
reinforced insulated parts in class II applications
2.26
partly reinforced insulated lampholder
lampholder for building-in, so designed that some parts of the lampholder require additional
means to fulfil the requirements with regard to double or reinforced insulation
NOTE  In some cases, the dimensions might be achieved only after mounting into the luminaire.
3 General requirements
Lampholders shall be so designed and constructed that in normal use they function reliably
and cause no danger to persons or surroundings.
In general, compliance is checked by carrying out all the relevant tests specified.
Independent lampholders, not specifically intended for building-in, shall comply with the
requirements of the following sections and subclauses of IEC 60598-1 where the subject-
matter of these headings is not dealt with in the present standard.
Section 2 – Classification
Section 3 – Marking
Section 4 – Construction (as appropriate)
Section 8 – Protection against electric shock
Section 9 – Resistance to dust, solid objects and moisture
Section 10 – Insulation resistance and electric strength (for class II)
Subclauses 12.4 and 12.5 – Thermal tests
4 General conditions for tests
4.1 Tests according to this standard are type tests.
NOTE The requirements and tolerances permitted by this standard are related to testing of a type test sample
submitted for that purpose. Compliance of the type test sample does not ensure compliance of the whole
production of a manufacturer with this safety standard. In addition to type testing, conformity of production is the
responsibility of the manufacturer and may include routine tests and quality control.
For further information see IEC 60061-4, sheet 7007-13.
4.2 Unless otherwise specified, the samples are tested as delivered and installed as in
normal use without lamps, at an ambient temperature of 20 °C ± 5 °C.

61184  IEC:2008+A1:2011 – 13 –
4.3 All inspections and tests are carried out on a total of:
– 8 specimens for unswitched lampholders, or
– 11 specimens for switched lampholders;
in the order of the clauses as follows:
– 3 specimens: Clauses 3 to 12;
– 3 specimens: Clauses 14 to 18;
– 3 specimens: Clause 13 (switched lampholder tests only);
– 2 specimens: Clauses 19 and 20.
NOTE For testing of screwless terminals according to 10.2, separate additional specimens are required.
This is also necessary for independent lampholders not specifically intended for building-in
(see Clause 3).
4.4 If no lampholder fails in the complete series of tests specified in 4.3, then lampholders of
that type shall be deemed to comply with this standard.
If one lampholder fails in any group in the complete series of tests specified in 4.3, the
lampholders of that type shall be deemed to have failed to comply with this standard, unless
that lampholder can be shown to be not representative of normal production or design, in
which case a further set of lampholders shall be submitted to the test or tests in that group.
Generally, it will be necessary to only repeat the test in which failure occurs. However, if the
lampholder fails in the test specified in Clauses 14 to 18 inclusive, the tests shall be repeated
from the tests of Clause 14 onwards.
An additional type test sample may be submitted, together with the first type test sample, in
case one lampholder fails, in which case the additional type test sample shall then be tested
and shall only be rejected if a further failure occurs. If there is no failure in this retest, then
lampholders of that type shall be deemed to comply with this standard. If the additional type
test sample is not submitted at the same time, a failure of one lampholder shall entail a
rejection.
If more than one specimen fails in the complete series of tests specified in 4.3 then
lampholders of that type shall be deemed to have failed to comply with this standard.
NOTE In view of the duration of the test procedure, lampholders differing only in detail and having the same
constructional principles and materials may be covered by a single series of type tests, subject to agreement
between applicant and test house.
5 Standard ratings
5.1 Standard rated voltage
For all lampholders only a rated voltage of 250 V is allowed.
Lampholders B15d are not intended for use in circuits with ignitors.
Lampholders B22d shall not be used in circuits with ignitors without approval from the
lampholder manufacturer.
NOTE From the theoretical point of view, the minimum creepage distance required for a holder B22d will result in
a clearance sufficient to withstand a pulse voltage of 2,5 kV.

– 14 – 61184  IEC:2008+A1:2011
The measures required to allow easy contact travel and lamp removal might in some
situations, however, be accompanied by unforeseen reduction of the clearance without
influence on normal operation (without ignition) where only the creepage distances are
critical.
BY22d lampholders are specially designed for use in ignitor circuits.
5.2 Standard rated currents
Standard rated currents are:
– 2 A for lampholders B15d;
– 2 A for lampholders B22d.
The rated current shall be not less than the standard value. Rated currents higher than 2 A
are allowed.
Compliance with the requirements of 5.1 and 5.2 is checked by inspection of the marking.
6 Classification
Lampholders are classified:
6.1 According to the material of the exterior:
– lampholders whose exterior is made wholly of plastic material;
– lampholders whose exterior is made wholly of ceramic material;
– lampholders whose exterior is made wholly or partly of metal.
NOTE For definition of "exterior", see note to 2.1.1.
Lampholders with external parts consisting partly of metal and lampholders comprising external parts of insulating
material with a conductive outer surface, e.g. a metallized outer shell, are considered as metal lampholders.
This does not apply to threaded entries and external parts, as for example a metal shade ring mounted on to the
outside of a lampholder of insulating material, which cannot become live even in the case of an insulation fault.
Metal lampholders with insulating coverings are considered as metal lampholders.
If in doubt as to whether or not a surface is conductive, two stripe-electrodes 1,5 mm wide,
25 mm long and with a distance of 2 mm from each other are applied to the surface (e.g. with
silver conductive paint). In accordance with 14.3, the insulating resistance is measured
between the stripes. The surface is considered to be conductive if the resistance is less than
5 MΩ.
6.2 According to degree of protection against solid objects and ingress of water:
– ordinary lampholders;
– drip-proof lampholders.
NOTE A classification for higher degrees of protection against ingress of water is under consideration.
6.3 According to method of fixing:
– threaded entry lampholders;
– cord grip lampholders;
– backplate lampholders;
– other lampholders.
61184  IEC:2008+A1:2011 – 15 –
NOTE Examples of other lampholders are lampholders provided with a mechanical suspension device e.g. a
hook.
6.4 According to type:
– switched lampholders provided with an integral switch to control the supply to the lamp;
– non-switched lampholders.
6.5 According to protection against electric shock:
– enclosed lampholders;
– unenclosed lampholders;
– independent lampholders.
− unenclosed lampholders;
− enclosed lampholders;
− independent lampholders;
− partly reinforced insulated lampholders;
− enclosed reinforced insulated lampholders.
NOTE Where a lampholder is used with a working voltage of 50 % or less of its maximum rating, it may be
regarded as equivalent to a reinforced insulated lampholder.
6.6 According to resistance to heat:
– without T marking, suitable for rated operating temperatures up to and including 135 °C for
B15d lampholders and 165 °C for B22d lampholders;
– with Txxx marking, suitable for rated operating temperatures up to and including the
temperature marked or declared by the manufacturer. These temperatures shall be not
lower than 140 °C for B15d lampholders and not lower than 170 °C for B22d lampholders;
NOTE The value of the temperature marking is increased by steps of 10 °C.
– with T1 marking, suitable for temperatures on the lamp cap up to and including 165 °C;
NOTE The continued use of T1 lampholders is subject to review.
– with T2 marking, suitable for temperatures on the lamp cap up to and including 210 °C.
7 Marking
7.1 Lampholders shall be marked with:
– rated voltage, in volts;
– rated operating temperature Txxx, T1 or T2, if applicable (see 6.6).
In the first version, the letter T shall be followed by the value of the rated operating
temperature in degrees Celsius;
– symbol for nature of supply, if required (for switched lampholders only);
– for lampholders whose exterior is made wholly of ceramic material, information on the
rated operating temperature, if applicable, shall either be marked on the lampholder or
given in the manufacturer's catalogue;
– mark of origin (this may take the form of a trade mark, or the manufacturer's or
responsible vendor's name or identification mark);
NOTE The mark of origin is not intended to mean the country of origin.
– either a unique catalogue number or an identifying reference;
NOTE An identifying reference may include numbers, letters, colour, etc. to identify the lampholder by
reference to the manufacturer's or responsible vendor's catalogue or similar literature.

– 16 – 61184  IEC:2008+A1:2011
NOTE Available technical documentation of the manufacturer like printed catalogues or online catalogues
should allow a clear identification of a lampholder either by a unique catalogue number or by an identifying
reference on the holder, specifying the essential characteristic features and the basic design of the product
supplemented by a clear description. Variations of the basic design like for example different cable length,
fixing means, colours etc., which do not affect safety or performance of the lampholder, may be disregarded
in the type reference marked on the product. Variations included in the type testing procedure are listed in the
corresponding test reports.
– rated current, in amperes, if greater than 2 A;
– IP number, if other than ordinary, for degree of protection against ingress of water (see
6.2);
– for single-pole switched lampholder, the switched pole shall be identified.
For lampholders according to this standard, the distances for impulse withstand category II
are applicable. This information shall be indicated in the manufacturer's catalogue or the like.
Lampholders complying with the electrical strength test for double or reinforced insulation and
having creepage distances and clearances equivalent to double or reinforced insulation offer
an adequate level of protection for use in luminaries where they are accessible in normal use.
Such lampholders are addressed as lampholders for use in class II applications. This
information shall be indicated in the manufacturer’s catalogue or the like.
NOTE Values for creepage distances and clearances as well as test voltages for the electrical strength test for
double or reinforced insulation are given in IEC 60598-1.
To achieve sufficient creepage distances and clearances to outer accessible surfaces,
additional attachments could be used. In some cases, these dimensions might be achieved
only after mounting the lampholder in the luminaire. Relevant information should be provided
in the manufacturer’s catalogue or the like.
Enclosed reinforced insulated lampholders offer an adequate level of protection for use in
luminaires where they are accessible in normal use. This information shall be indicated in the
manufacturer’s catalogue ore the like.
For partly reinforced insulated lampholders, sufficient creepage distances and clearances to
outer accessible surfaces will require additional protection to some parts of the lampholder by
the luminaire design or by use of additional attachment(s) or cover(s). This information shall
be indicated in the manufacturer’s catalogue or the like.
7.2 If symbols are used for current and voltage, A shall denote amperes and V volts.
Alternatively, figures alone may be used, the figure for the rated current being marked before
or above that for the rated voltage and separated from the latter by a line.
Therefore, the marking for current and voltage may be as follows:
4 A 250 V or 4/250 or
The symbol for d.c. shall be  (see IEC 60417, symbol IEC 60417-5031(2002-10)).
The symbol for protection against ingress of water shall, for drip-proof lampholders, be IPX1.
NOTE Where X is used in an IP number, it is intended to indicate a missing numeral in the symbol but both the
appropriate numerals in accordance with IEC 60529 must be marked on the lampholder.
7.3 The marking of degree of pr
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