SIST EN 60929:2011
AC and/or DC-supplied electronic control gear for tubular fluorescent lamps - Performance requirements
AC and/or DC-supplied electronic control gear for tubular fluorescent lamps - Performance requirements
This international Standard specifies performance requirements for electronic control gear for use on a.c. at 50 Hz or 60 Hz and/or d.c. supplies, both up to 1 000 V, with operating frequencies deviating from the supply frequency, associated with fluorescent lamps as specified in IEC 60081 and IEC 60901, and other fluorescent lamps for high-frequency operation.
NOTE 1 Tests in this standard are type tests. Requirements for testing individual control gear during production are not included.
NOTE 2 There are regional standards regarding the regulation of mains current harmonics and immunity for endproducts like luminaires and independent control gear. In a luminaire, the control gear is dominant in this respect. Control gear, together with other components, should comply with these standards.
Wechsel- und/oder gleichstromversorgte elektronische Betriebsgeräte für röhrenförmige Leuchtstofflampen - Anforderungen an die Arbeitsweise
Appareillages électroniques alimentés en courant alternatif et/ou continu pour lampes tubulaires à fluorescence - Exigences de performances
La CEI 60929:2011 spécifie les exigences de performances pour les appareillages électroniques alimentés en courant alternatif 50 Hz ou 60 Hz et/ou continu jusqu'à 1 000 V à, avec des fréquences de travail s'écartant de la fréquence d'alimentation, et utilisés en association avec des lampes à fluorescence comme celles indiquées dans la CEI 60081 et la CEI 60901, ou avec d'autres types de lampes à fluorescence pour fonctionnement à haute fréquence. Cette quatrième édition annule et remplace la troisième édition parue en 2006, la CEI 60925 parue en 1989, son amendement 1 (1996) et son amendement 2 (2001). Cette quatrième édition constitue une révision technique. Les modifications majeures par rapport à la troisième édition concernent l'extension aux appareillages alimentés en courant continu et la suppression des exigences pour les commandes par signaux numériques des appareillages électroniques. Le contenu du corrigendum de septembre 2011 a été pris en considération dans cet exemplaire.
Izmenično napajane elektronske predstikalne naprave za cevaste fluorescenčne svetilke - Tehnične zahteve
Ta mednarodni standard določa tehnične zahteve za elektronske predstikalne naprave za
uporabo pri izmeničnem 50 Hz ali 60 Hz in/ali enosmernem napajanju do 1000 V, s frekvencami delovanja, ki odstopajo od frekvenc napajanja, povezanimi s fluorescenčnimi svetilkami, kot je določeno v IEC 60081 in IEC 60901 in drugimi fluorescenčnimi svetilkami za visokofrekvenčno delovanje.
OPOMBA 1: Preskusi v tem standardu so tipski. Zahteve za preskušanje posameznih predstikalnih naprav med proizvodnjo niso vključene.
OPOMBA 2: Glede ureditve harmonik toka v omrežjih ter odpornosti končnih proizvodov, kot so svetila in neodvisne predstikalne naprave, obstajajo regijski standardi. Pri sijalki v zvezi s tem prevladuje predstikalna naprava.
Predstikalna naprava in druge komponente morajo biti v skladu s temi standardi.
General Information
Relations
Standards Content (Sample)
SLOVENSKI STANDARD
SIST EN 60929:2011
01-oktober-2011
,]PHQLþQRQDSDMDQHHOHNWURQVNHSUHGVWLNDOQHQDSUDYH]DFHYDVWHIOXRUHVFHQþQH
VYHWLONH7HKQLþQH]DKWHYH
AC and/or DC-supplied electronic control gear for tubular fluorescent lamps -
Performance requirements
Wechsel- und/oder gleichstromversorgte elektronische Betriebsgeräte für röhrenförmige
Leuchtstofflampen - Anforderungen an die Arbeitsweise
Appareillages électroniques alimentés en courant alternatif et/ou continu pour lampes
tubulaires à fluorescence - Exigences de performances
Ta slovenski standard je istoveten z: EN 60929:2011
ICS:
29.140.30 )OXRUHVFHQþQHVLMDONH6LMDONH Fluorescent lamps.
Discharge lamps
SIST EN 60929:2011 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.
---------------------- Page: 1 ----------------------
SIST EN 60929:2011
---------------------- Page: 2 ----------------------
SIST EN 60929:2011
EUROPEAN STANDARD
EN 60929
NORME EUROPÉENNE
July 2011
EUROPÄISCHE NORM
ICS 29.140.30 Supersedes EN 60929:2006 + corr. Dec.2006
English version
AC and/or DC-supplied electronic control gear for tubular fluorescent
lamps -
Performance requirements
(IEC 60929:2011)
Appareillages électroniques alimentés en Wechsel- und/oder gleichstromversorgte
courant alternatif et/ou continu pour elektronische Betriebsgeräte für
lampes tubulaires à fluorescence - röhrenförmige Leuchtstofflampen -
Exigences de performances Anforderungen an die Arbeitsweise
(CEI 60929:2011) (IEC 60929:2011)
This European Standard was approved by CENELEC on 2011-06-23. CENELEC members are bound to comply
with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard
the status of a national standard without any alteration.
Up-to-date lists and bibliographical references concerning such national standards may be obtained on
application to the Central Secretariat or to any CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other
language made by translation under the responsibility of a CENELEC member into its own language and notified
to the Central Secretariat has the same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus,
the Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy,
Latvia, Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia,
Spain, Sweden, Switzerland and the United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Management Centre: Avenue Marnix 17, B - 1000 Brussels
© 2011 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. EN 60929:2011 E
---------------------- Page: 3 ----------------------
SIST EN 60929:2011
EN 60929:2011 - 2 -
Foreword
The text of document 34C/963/FDIS, future edition 4 of IEC 60929, prepared by SC 34C, Auxiliaries for
lamps, of IEC TC 34, Lamps and related equipment, was submitted to the IEC-CENELEC parallel vote
and was approved by CENELEC as EN 60929 on 2011-06-23.
This European Standard supersedes EN 60929:2006 + corr. Dec.2006.
The essential change with respect to EN 60929:2006 + corr. Dec.2006 is the extension to DC supplied
control gear and the deletion of the requirements for digital signal control of electronic control gear.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN and CENELEC shall not be held responsible for identifying any or all such patent
rights.
The following dates were fixed:
– latest date by which the EN has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2012-03-23
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2014-06-23
NOTE In this standard, the following print types are used:
– Requirements proper: in roman type.
– Test specifications: in italic type.
– Explanatory matter: in smaller roman type.
Annex ZA has been added by CENELEC.
__________
Endorsement notice
The text of the International Standard IEC 60929:2011 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards indicated:
IEC 61000-3-2 NOTE Harmonized as EN 61000-3-2.
IEC 61000-4-30 NOTE Harmonized as EN 61000-4-30.
IEC 61547 NOTE Harmonized as EN 61547
__________
---------------------- Page: 4 ----------------------
SIST EN 60929:2011
- 3 - EN 60929:2011
Annex ZA
(normative)
Normative references to international publications
with their corresponding European publications
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.
NOTE When an international publication has been modified by common modifications, indicated by (mod), the relevant EN/HD
applies.
Publication Year Title EN/HD Year
IEC 60081 1997 Double-capped fluorescent lamps - EN 60081 1998
+ A1 (mod) 2000 Performance specifications + A1 2002
+ A2 2003 + A2 2003
+ A3 2005 + A3 2005
+ A4 2010 + A4 2010
IEC 60901 1996 Single-capped fluorescent lamps - EN 60901 1996
+ A1 1997 Performance specifications + A1 1997
+ A2 2000 + corr. October 1997
+ A3 2004 + A2 2000
+ A4 2007 + A3 2004
+ A4 2008
IEC 61347-1 (mod) 2007 Lamp controlgear - EN 61347-1 2008
Part 1: General and safety requirements
IEC 61347-2-3 2000 Lamp controlgear - EN 61347-2-3 2001
+ A1 2004 Part 2-3: Particular requirements for a.c. + corr. July 2003
+ A2 2006 supplied electronic ballasts for fluorescent + corr. December 2010
lamps + A1 2004
+ A2 2006
IEC 62386 Series Digital addressable lighting interface EN 62386 Series
---------------------- Page: 5 ----------------------
SIST EN 60929:2011
---------------------- Page: 6 ----------------------
SIST EN 60929:2011
IEC 60929
®
Edition 4.0 2011-05
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
AC and/or DC-supplied electronic control gear for tubular fluorescent lamps –
Performance requirements
Appareillages électroniques alimentés en courant alternatif et/ou continu pour
lampes tubulaires à fluorescence – Exigences de performances
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
PRICE CODE
INTERNATIONALE
CODE PRIX X
ICS 29.140.30 ISBN 978-2-88912-509-8
® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 7 ----------------------
SIST EN 60929:2011
– 2 – 60929 © IEC:2011
CONTENTS
FOREWORD . 4
INTRODUCTION . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 8
4 General notes on tests . 9
5 Marking . 10
5.1 Mandatory marking . 10
5.2 Additional mandatory Information . 10
5.3 Non-mandatory information . 10
6 General statement . 11
7 Starting conditions . 11
7.1 General . 11
7.2 Conditions for control gear with preheating . 11
7.2.1 General . 11
7.2.2 Preheat energy . 11
7.2.3 Open-circuit voltage . 12
7.3 Conditions for control gear without preheating . 13
7.3.1 General . 13
7.3.2 Open-circuit voltage . 13
7.3.3 Control gear impedance test . 13
7.3.4 Cathode current . 13
7.4 Starting aid and distances . 14
8 Operating conditions . 14
8.1 Ballast lumen factor . 14
8.2 Total circuit power . 14
8.3 Requirements for dimming . 14
8.3.1 Lamp cathode heating . 14
8.3.2 Control interfaces . 14
8.4 Current limitation . 14
9 Circuit power factor . 14
10 Supply current . 15
11 Maximum current in any lead to a cathode . 15
12 Lamp operating current waveform . 15
13 Impedance at audio frequencies . 15
14 Operational tests for abnormal conditions . 16
14.1 Removal of lamp(s) . 16
14.2 Lamp fails to start . 16
14.3 Control gear behaviour close to end of lamp life . 16
15 Endurance . 16
15.1 General . 16
15.2 Temperature cycling . 16
15.3 Test at tc +10 K . 17
Annex A (normative) Tests . 21
Annex B (normative) Reference ballasts . 26
---------------------- Page: 8 ----------------------
SIST EN 60929:2011
60929 © IEC:2011 – 3 –
Annex C (normative) Conditions for reference lamps . 30
Annex D (informative) Explanation of starting conditions . 31
Annex E (normative) Control interface for controllable control gear . 35
Bibliography . 40
Figure 1 – Schematic illustration of the energy required for preheating and starting . 18
Figure 2 – Test circuits for non-preheat starting mode . 20
Figure A.1 – Measurement of impedance at audio frequencies. 24
Figure A.2 – Test circuit for control gear for preheat starting mode . 25
Figure B.1 – HF reference circuit . 29
Figure E.1 – Functional specification for d.c. voltage control . 35
Figure E.2 – Connection diagram for several controllable control gear . 36
Figure E.3 – Circuit diagram with current sourcing . 36
Figure E.4 – Functional specification for PWM control . 37
Figure E.5 – PWM signal characteristics . 37
Figure E.6 – Connecting diagram for PWM controllable control gear . 38
Figure E.7 – Dimming curve for controllable control gear . 39
Table 1 – Control gear life time information . 10
---------------------- Page: 9 ----------------------
SIST EN 60929:2011
– 4 – 60929 © IEC:2011
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
AC and/or DC-SUPPLIED ELECTRONIC CONTROL GEAR
FOR TUBULAR FLUORESCENT LAMPS –
PERFORMANCE REQUIREMENTS
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
members of its technical committees and IEC National Committees for any personal injury, property damage or
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.
International Standard IEC 60929 has been prepared by subcommittee 34C: Auxiliaries for
lamps, of IEC technical committee 34: Lamps and related equipment.
This fourth edition cancels and replaces the third edition published in 2006, IEC 60925
published in 1989, its Amendment 1 (1996) and its Amendment 2 (2001). This fourth edition
constitutes a technical revision. The essential change with respect to the third edition is the
extension to DC supplied control gear and the deletion of the requirements for digital signal
control of electronic control gear.
The text of this standard is based on the following documents:
FDIS Report on voting
34C/963/FDIS 34C/976/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.
---------------------- Page: 10 ----------------------
SIST EN 60929:2011
60929 © IEC:2011 – 5 –
This publication has been drafted in accordance with ISO/IEC Directives, Part 2.
NOTE In this standard, the following print types are used:
– Requirements proper: in roman type.
– Test specifications: in italic type.
– Explanatory matter: in smaller roman type.
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.
---------------------- Page: 11 ----------------------
SIST EN 60929:2011
– 6 – 60929 © IEC:2011
INTRODUCTION
This International Standard covers performance requirements for electronic control gear for
use on a.c., at 50 Hz or 60 Hz, and/or d.c. supplies up to 1 000 V with operating frequencies
deviating from the supply frequency, associated with tubular fluorescent lamps as specified in
IEC 60081 and IEC 60901, and other tubular fluorescent lamps for high frequency operation,
still to be standardised.
These control gear are intended to operate lamps at various frequencies including high
frequencies and at various lamp powers. Attention is drawn to the fact that operating
frequencies below 20 kHz may cause audio noise disturbance, whereas frequencies above
50 kHz may increase radio interference problems.
Some lamps may be specifically designed for high-frequency operation on high-frequency
control gear. Two starting modes, preheat and non-preheat, are described.
NOTE Lamps, only specified for preheat starting may be operated on other types of circuits. The control gear
manufacturer should provide test data which shows satisfactory starting and operation similar as the ones stated in
Clause 6.
In order to obtain satisfactory performance of fluorescent lamps and electronic control gears,
it is necessary that certain features of their design be properly co-ordinated. It is essential,
therefore, that specifications for them be written in terms of measurement made against some
common baseline of reference, permanent and reproducible.
These conditions may be fulfilled by reference ballasts. Moreover, the testing of control gear
for fluorescent lamps will, in general, be made with reference lamps and, in particular, by
comparing results obtained on such lamps with control gear to be tested and with reference
ballast.
Whereas the reference ballast for frequencies of 50 Hz or 60 Hz is a self-inductive coil, the
high-frequency reference ballast is a resistor because of its independence of frequency and
the lack of influence of parasitic capacitance.
---------------------- Page: 12 ----------------------
SIST EN 60929:2011
60929 © IEC:2011 – 7 –
AC and/or DC-SUPPLIED ELECTRONIC CONTROL GEAR
FOR TUBULAR FLUORESCENT LAMPS –
PERFORMANCE REQUIREMENTS
1 Scope
This international Standard specifies performance requirements for electronic control gear for
use on a.c. at 50 Hz or 60 Hz and/or d.c. supplies, both up to 1 000 V, with operating
frequencies deviating from the supply frequency, associated with fluorescent lamps as
specified in IEC 60081 and IEC 60901, and other fluorescent lamps for high-frequency
operation.
NOTE 1 Tests in this standard are type tests. Requirements for testing individual control gear during production
are not included.
NOTE 2 There are regional standards regarding the regulation of mains current harmonics and immunity for end-
products like luminaires and independent control gear. In a luminaire, the control gear is dominant in this respect.
Control gear, together with other components, should comply with these standards.
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 60081:1997, Double-capped fluorescent lamps – Performance specifications
Amendment 1(2000)
Amendment 2 (2003)
Amendment 3 (2005)
Amendment 4 (2010)
IEC 60901:1996, Single-capped fluorescent lamps – Performance specifications
Amendment 1(1997)
Amendment 2 (2000)
Amendment 3 (2004)
Amendment 4 (2007)
IEC 61347-1:2007, Lamp controlgear – Part 1: General and safety requirements
1
Amendment 1(2010)
IEC 61347-2-3:2000, Lamp controlgear – Part 2-3: Particular requirements for a.c. supplied
electronic ballasts for fluorescent lamps
Amendment 1(2004)
Amendment 2 (2006)
IEC 62386 (all parts), Digital addressable lighting
———————
1
There exists a consolidated edition 2.1 (2010) that comprises IEC 61347-1:2007 and its Amendment 1 (2010).
---------------------- Page: 13 ----------------------
SIST EN 60929:2011
– 8 – 60929 © IEC:2011
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
3.1
starting aid
a conductive strip affixed to the outer surface of a lamp, or a conductive plate which is spaced
within an appropriate distance from the lamp
A starting aid is usually connected to earth potential, and can only be effective when it has an
adequate potential difference from one end of the lamp.
3.2
ballast lumen factor
blf
ratio of the luminous flux of the lamp when the ballast under test is operated at its rated
voltage, to the luminous flux of the same lamp operated with the appropriate reference ballast
supplied at its rated voltage and frequency
3.3
reference ballast
special ballast, either inductive for lamps for operation on a.c. mains frequencies, or resistive
for lamps for operation on high frequency
It is designed for the purpose of providing comparison standards for use in testing ballasts, for
the selection of reference lamps and for testing regular production lamps under standardised
conditions. It is essentially characterised by the fact that, at its rated frequency, it has a stable
voltage/current ratio which is relatively uninfluenced by variations in current, temperature and
magnetic surroundings, as outlined in this standard.
[IEC 60050-845:1987, 845-08-36, modified]
3.4
reference lamp
lamp selected for testing control gear which, when associated with a reference ballast, has
electrical characteristics which are close to the nominal values as stated in the relevant lamp
standard
NOTE Specified conditions are given in Annex C.
3.5
total circuit power
total power dissipated by control gear and lamp in combination, at rated voltage and
frequency of the control gear
3.6
circuit power factor
λ
power factor of the combination of a control gear and the lamp or lamps for which the control
gear is designed
3.7
preheat starting
type of circuit in which the lamp electrodes are brought to emission temperature before the
lamp actually ignites
---------------------- Page: 14 ----------------------
SIST EN 60929:2011
60929 © IEC:2011 – 9 –
3.8
non-preheat starting
type of circuit which utilises a high open-circuit voltage causing secondary electron emission
from electrodes
3.9
electronic control gear life time
declared average life time at which 90 % of the electronic control gears are still operating
NOTE 1 In the context of life time, an electronic control gear is “operating” if it still fulfils it intended functions.
NOTE 2 The manufacturer apply suitable methods, e.g. statistical calculation and/or reliability testing.
3.10
ambient temperature
t
a
temperature range of the air surrounding the electronic control gear declared by the
manufacturer to indicate the normal operating temperature range for the electronic control
gear
NOTE 1 The lifetime of the electronic control gear is given at the ambient temperature ta; for ease of
measurement, also the corresponding temperature of the tc point is given.
NOTE 2 The measurement test condition for the ambient temperature assigned to the DUT should be in
accordance to Annex D of IEC 61347-1 at the rated voltage.
4 General notes on tests
4.1 Tests according to this standard are type tests.
NOTE The requirements and tolerances permitted by this standard are based on the testing of a type test sample
submitted by the manufacturer for that purpose. In principle this type test sample should consist of units having
characteristics typical of the manufacturer’s production and be as close to the production centre point values as
possible.
It may be expected with the tolerances given in this standard that products manufactured in accordance with the
type test sample will ensure compliance with the standard for the majority of the production. However, due to the
production spread, it is inevitable that there will sometimes be products outside the specified tolerances. For
guidance on sampling plans and procedures for inspection by attributes, see IEC 60410.
4.2 The tests are carried out in the order of the clauses, unless otherwise specified.
4.3 One control gear is submitted to all tests, unless otherwise stated.
4.4 In general, all tests are made on each type of control gear or where a power range of
similar control gear is involved, for each rated power in the range or on a representative
selection from the range as agreed with the manufacturer.
4.5 The tests are made under the conditions specified in Annex A. Lamp data sheets not
published in an IEC publication shall be made available by the lamp manufacturer.
4.6 All control gear specified in this standard shall comply with the requirements of
IEC 61347-2-3.
4.7 Attention is drawn to lamp performance standards which contain “information for
control gear design”; this should be followed for proper lamp operation; however, this
standard does not require the testing of lamp performance as part of the type test approval for
control gear.
---------------------- Page: 15 ----------------------
SIST EN 60929:2011
– 10 – 60929 © IEC:2011
5 Marking
5.1 Mandatory marking
Electronic control gear shall be clearly marked with the following mandatory marking as
applicable.
a) Circuit power factor, e.g. 0,85.
If the power factor is less than 0,95 capacitive, it shall be followed by the letter C, e.g.
0,85 C.
The following marking shall also be added, if appropriate:
b) The symbol Z which indicates that the control gear is designed to comply with the
conditions for audio-frequency impedance.
5.2 Additional mandatory Information
In addition to the above mandatory markings, the following informatio
...
Questions, Comments and Discussion
Ask us and Technical Secretary will try to provide an answer. You can facilitate discussion about the standard in here.