Auxiliaries for lamps - Ballasts for discharge lamps (excluding tubular fluorescent lamps) - Performance requirements

This International Standard specifies performance requirements for ballasts for discharge lamps such as high-pressure mercury vapour, low-pressure sodium vapour, high-pressure sodium vapour and metal halide lamps. Clauses 12 through 15 each detail specific requirements for a particular type of ballast. This standard covers inductive type ballasts for use on a.c. supplies up to 1 000 V at 50 Hz to 60 Hz associated with discharge lamps, having rated wattage, dimensions and characteristics as specified in the relevant IEC lamp standards.
NOTE 1 For certain types of discharge lamps an ignitor is required.
NOTE 2 Extension of the standard to cover ballasts incorporating, or for use with, series capacitors is under consideration.
NOTE 3 The performance requirements of ballasts for tubular fluorescent lamps are covered by IEC 60921.
NOTE 4 There are regional standards regarding the regulation of mains current harmonics for end-products such as 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.

Geräte für Lampen - Vorschaltgeräte für Entladungslampen (ausgenommen röhrenförmige Leuchtstofflampen) - Anforderungen an die Arbeitsweise

Appareillages de lampes - Ballasts pour lampes à décharge (à l'exclusion des lampes tubulaires à fluorescence) - Exigences de performance

La présente Norme internationale spécifie les exigences de performances des ballasts pour lampes à décharge, telles que les lampes à vapeur de mercure à haute pression, à vapeur de sodium à basse pression, à vapeur de sodium à haute pression et aux halogénures métalliques. Les Articles 12 à 15 donnent chacun les exigences pour un type particulier de ballasts. La norme couvre les ballasts du type inductif pour courant alternatif de fréquence égale à 50 Hz ou 60 Hz, et de tensions inférieures à 1 000 V, associés à des lampes à décharge dont la puissance nominale, les dimensions et les caractéristiques sont indiquées dans les normes de la CEI qui leurs sont applicables.

Pribor za sijalke – Dušilke za sijalke (razen cevastih fluorescenčnih sijalk) – Zahteve glede tehničnih lastnosti (IEC 60923:2005)

General Information

Status
Published
Publication Date
31-Dec-2005
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-Jan-2006
Due Date
01-Jan-2006
Completion Date
01-Jan-2006

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SLOVENSKI SIST EN 60923:2006
STANDARD
januar 2006
Pribor za sijalke – Dušilke za sijalke (razen cevastih fluorescenčnih sijalk) –
Zahteve glede tehničnih lastnosti (IEC 60923:2005)
(istoveten EN 60923:2005)

Auxiliaries for lamps – Ballasts for discharge lamps (excluding tubular fluorescent

lamps) – Performance requirements (IEC 60923:2005)
ICS 29.140.30 Referenčna številka
SIST EN 60923:2006(en)

© Standard je založil in izdal Slovenski inštitut za standardizacijo. Razmnoževanje ali kopiranje celote ali delov tega dokumenta ni dovoljeno

---------------------- Page: 1 ----------------------
EUROPEAN STANDARD EN 60923
NORME EUROPÉENNE
EUROPÄISCHE NORM November 2005
ICS 29.140.30 Supersedes EN 60923:1996 + A1:2001
English version
Auxiliaries for lamps –
Ballasts for discharge lamps (excluding tubular fluorescent lamps) -
Performance requirements
(IEC 60923:2005)
Appareillages de lampes – Geräte für Lampen –
Ballasts pour lampes à décharge Vorschaltgeräte für Entladungslampen
(à l'exclusion des lampes tubulaires (ausgenommen röhrenförmige
à fluorescence) – Leuchtstofflampen) –
Exigences de performance Anforderungen an die Arbeitsweise
(CEI 60923:2005) (IEC 60923:2005)

This European Standard was approved by CENELEC on 2005-10-01. 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, Cyprus, Czech

Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,

Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Slovakia, Slovenia, Spain, Sweden,

Switzerland and United Kingdom.
CENELEC
European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2005 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.

Ref. No. EN 60923:2005 E
---------------------- Page: 2 ----------------------
EN 60923:2005 - 2 -
Foreword

The text of document 34C/688/FDIS, future edition 3 of IEC 60923, 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 60923 on 2005-10-01.
This European Standard supersedes EN 60923:1996 + A1:2001.

The purpose of publishing this new edition of EN 60923 was to remove EMC related requirements

which are deemed to be of a regional nature. At the same time, references to quoted standards were

updated.
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) 2006-07-01
– latest date by which the national standards conflicting
with the EN have to be withdrawn (dow) 2012-10-01

This standard is to be read in conjunction with EN 61347-2-9, Lamp controlgear – Part 2-9: Particular

requirements for ballasts for discharge lamps (excluding fluorescent lamps) together with EN 61347-1,

Lamp controlgear – Part 1: General and safety requirements.
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 60923:2005 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 60921 NOTE Harmonized as EN 60921:2004 (not modified).
IEC 61000-3-2 NOTE Harmonized as EN 61000-3-2:2000 (modified).
IEC 61547 NOTE Harmonized as EN 61547:1995 (not modified).
__________
---------------------- Page: 3 ----------------------
- 3 - EN 60923:2005
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 Where an international publication has been modified by common modifications, indicated by (mod), the relevant

EN/HD applies.
Publication Year Title EN/HD Year
1) 2)
IEC 60188 - High-pressure mercury vapour lamps - EN 60188 2001
Performance specifications
1) 2)
IEC 60192 - Low pressure sodium vapour lamps - EN 60192 2001
Performance specifications
1) 2)
IEC 60662 - High-pressure sodium vapour lamps EN 60662 1993
1) 2)
IEC 61167 - Metal halide lamps EN 61167 1994
1) 2)
IEC 61347-1 - Lamp controlgear EN 61347-1 2001
Part 1: General and safety requirements + corr. July 2003
1) 2)
IEC 61347-2-1 - Part 2-1: Particular requirements for EN 61347-2-1 2001
starting devices (other than glow starters) + corr. July 2003
1) 2)
IEC 61347-2-9 - Part 2-9: Particular requirements for EN 61347-2-9 2001
ballasts for discharge lamps (excluding + corr. July 2003
fluorescent lamps)
Undated reference.
Valid edition at date of issue.
---------------------- Page: 4 ----------------------
NORME CEI
INTERNATIONALE
IEC
60923
INTERNATIONAL
Edition 3.1
STANDARD
2006-09
Edition 3:2005 consolidée par l'amendement 1:2006
Edition 3:2005 consolidated with amendment 1:2006
Appareillages de lampes –
Ballasts pour lampes à décharge
(à l'exclusion des lampes tubulaires
à fluorescence) – Exigences de performance
Auxiliaries for lamps –
Ballasts for discharge lamps
(excluding tubular fluorescent lamps) –
Performance requirements
 IEC 2006 Droits de reproduction réservés  Copyright - all rights reserved

Aucune partie de cette publication ne peut être reproduite ni No part of this publication may be reproduced or utilized in any

utilisée sous quelque forme que ce soit et par aucun procédé, form or by any means, electronic or mechanical, including

électronique ou mécanique, y compris la photocopie et les photocopying and microfilm, without permission in writing from

microfilms, sans l'accord écrit de l'éditeur. the publisher.

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Telephone: +41 22 919 02 11 Telefax: +41 22 919 03 00 E-mail: inmail@iec.ch Web: www.iec.ch

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Pour prix, voir catalogue en vigueur
For price, see current catalogue
---------------------- Page: 5 ----------------------
60923  IEC:2005+A1:2006 – 3 –
CONTENTS

FOREWORD...........................................................................................................................7

INTRODUCTION...................................................................................................................11

1 Scope.............................................................................................................................13

2 Normative references .....................................................................................................13

3 Terms and definitions .....................................................................................................13

4 General notes on tests ...................................................................................................15

5 Marking ..........................................................................................................................15

6 Ballasts designed to operate at various supply voltages .................................................15

7 Circuit power-factor ........................................................................................................15

8 Supply current ................................................................................................................17

9 Current waveform ...........................................................................................................17

9.1 Lamp operating current waveform .........................................................................17

9.2 Test procedure ......................................................................................................17

10 Magnetic screening ........................................................................................................19

11 Ignitors ...........................................................................................................................19

12 Electrical requirements for ballasts for high-pressure mercury vapour lamps ..................19

12.1 Ballast setting .......................................................................................................19

12.2 Short-circuit current...............................................................................................21

12.3 Open-circuit voltage (minimum voltage for stable operation)..................................21

13 Electrical requirements for ballasts for low-pressure sodium vapour lamps .....................23

13.1 Ballast setting .......................................................................................................23

13.2 Short-circuit current and run-up conditions ............................................................23

13.3 Open-circuit voltage (minimum voltage for stable operation)..................................25

14 Electrical requirements for ballasts for metal halide lamps..............................................25

14.1 Ballast setting .......................................................................................................25

14.2 Short-circuit current and run-up conditions ............................................................25

14.3 Open-circuit voltage (minimum voltage for stable operation)..................................27

15 Electrical requirements for ballasts for high-pressure sodium vapour lamps....................29

15.1 Ballast setting .......................................................................................................29

15.2 Short-circuit current...............................................................................................29

15.3 Open-circuit voltage ..............................................................................................31

Annex A (normative) Reference ballasts ..............................................................................33

Annex B (normative) Reference lamps .................................................................................39

Annex C (normative) General requirements for tests............................................................43

Annex D (normative) Explanation of measurements of ballast setting and lamp-

operating current waveform for high-pressure sodium vapour lamps .....................................47

Annex E (informative) Interpretations...................................................................................51

---------------------- Page: 6 ----------------------
60923  IEC:2005+A1:2006 – 5 –

Figure 1 – Measurement of current waveform .......................................................................19

Figure 2 – Circuit for testing ballasts for high-pressure mercury vapour and low-

pressure sodium vapour lamps .............................................................................................21

Figure 3 – Lamp inrush-current test circuit ............................................................................27

Figure A.1 – Recommended circuit for the measurement of voltage/current ratio of the

reference ballast ...................................................................................................................35

Figure A.2 – Recommended circuit for the determination of power-factor of the

reference ballast ...................................................................................................................35

Figure B.1 – Recommended circuit for the selection of reference lamps................................41

Figure D.1 – HPS ballast setting compliance characteristics for a lamp operated from

a reference ballast and from a test ballast ............................................................................49

Table 1 – Lamp operating current waveform, maximum ratio of peak value to r.m.s. .............17

Table 2 – Test current...........................................................................................................25

Table 3 – Short-circuit current ratio.......................................................................................31

---------------------- Page: 7 ----------------------
60923 © IEC:2005+A1:2006 – 7 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
___________
AUXILIARIES FOR LAMPS –
BALLASTS FOR DISCHARGE LAMPS
(EXCLUDING 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 provides no marking procedure to indicate its approval and cannot be rendered responsible for any

equipment declared to be in conformity with an IEC Publication.

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 60923 has been prepared by subcommittee 34C: Auxiliaries for

lamps, of IEC technical committee 34: Lamps and related equipment.

This consolidated version of IEC 60923 consists of the third edition (2005) [documents

34C/688/FDIS and 34C/694/RVD] and its amendment 1 (2006) [documents 34C/749/FDIS and

34C/758/RVD].

The technical content is therefore identical to the base edition and its amendment and has

been prepared for user convenience.
It bears the edition number 3.1.

A vertical line in the margin shows where the base publication has been modified by

amendment 1.

The purpose of publishing the third edition of IEC 60923 was to remove EMC related

requirements which are deemed to be of a regional nature. At the same time, references to

quoted standards were updated.
---------------------- Page: 8 ----------------------
60923  IEC:2005+A1:2006 – 9 –

This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.

This standard is to be read in conjunction with IEC 61347-2-9, Lamp controlgear – Part 2-9:

Particular requirements for ballasts for discharge lamps (excluding fluorescent lamps)

together with IEC 61347-1, Lamp controlgear – Part 1: General and safety requirements.

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 the base publication and its amendments will

remain unchanged until the maintenance result 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: 9 ----------------------
60923  IEC:2005+A1:2006 – 11 –
INTRODUCTION
This standard covers performance requirements for ballasts for discharge lamps.

In order to obtain satisfactory performance of discharge lamps and their associated ballasts, it

is necessary that certain features of their design be properly coordinated. Therefore, it is

essential that specifications for them be written in terms of measurements made against some

common baseline of reference, which should be permanent and reproducible.

These conditions may be fulfilled by special or selected inductive-type ballasts, called

"reference ballasts". These ballasts may be used for testing ordinary ballasts and for the

selection of reference lamps.

Moreover, the testing of ballasts requires a clear definition of testing methods. This testing

will, in general, be made with reference lamps and, in particular, by comparing results

obtained on such lamps with these ballasts and with the reference ballast.

Because of the special characteristics of discharge lamps, two ranges of supply voltage

variation had to be considered. Whenever safety is involved, the classical range of variation

from 90 % to 110 % of the rated supply voltage is retained, but for certain clauses where only

operational conditions are concerned a smaller range from 92 % to 106 % of the rated value

has been considered.
---------------------- Page: 10 ----------------------
60923  IEC:2005+A1:2006 – 13 –
AUXILIARIES FOR LAMPS –
BALLASTS FOR DISCHARGE LAMPS
(EXCLUDING TUBULAR FLUORESCENT LAMPS) –
PERFORMANCE REQUIREMENTS
1 Scope

This International Standard specifies performance requirements for ballasts for discharge

lamps such as high-pressure mercury vapour, low-pressure sodium vapour, high-pressure

sodium vapour and metal halide lamps. Clauses 12 through 15 each detail specific

requirements for a particular type of ballast. This standard covers inductive type ballasts for

use on a.c. supplies up to 1 000 V at 50 Hz to 60 Hz associated with discharge lamps, having

rated wattage, dimensions and characteristics as specified in the relevant IEC lamp

standards.
NOTE 1 For certain types of discharge lamps an ignitor is required.

NOTE 2 Extension of the standard to cover ballasts incorporating, or for use with, series capacitors is under

consideration.

NOTE 3 The performance requirements of ballasts for tubular fluorescent lamps are covered by IEC 60921.

NOTE 4 There are regional standards regarding the regulation of mains current harmonics for end-products such

as 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 60188, High-pressure mercury vapour lamps – Performance specifications
IEC 60192, Low pressure sodium vapour lamps – Performance specifications
IEC 60662, High-pressure sodium vapour lamps
IEC 61167, Metal halide lamps
IEC 61347-1, Lamp controlgear – Part 1: General and safety requirements

IEC 61347-2-1, Lamp controlgear – Part 2-1: Particular requirements for starting devices

(other than glow starters)

IEC 61347-2-9, Lamp controlgear – Part 2-9: Particular requirements for ballasts for discharge

lamps (excluding fluorescent lamps)
3 Terms and definitions
The terms and definitions given in IEC 61347-2-9 and IEC 61347-1 apply.
---------------------- Page: 11 ----------------------
60923  IEC:2005+A1:2006 – 15 –
4 General notes on tests
Tests according to this specification are type tests.

NOTE The requirements and tolerances permitted by this standard are based on 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 the standard that products manufactured in accordance

with the type test sample will comply with the standard for the majority of the production. Due to the production

spread, however, it is inevitable that there will sometimes be ballasts outside the specified tolerances. For

guidance of sampling plans and procedures for inspection by attributes, see IEC 60410.

The tests are carried out in the order of the clauses, unless otherwise specified.

One sample is submitted to all tests.

In general all tests are made on each type of ballast or, where a range of similar ballasts is

involved, for each rated wattage in the range, or a representative selection from the range, as

agreed with the manufacturer.

Reference ballasts and reference lamps shall be in accordance with Annexes A and B.

The tests are made under the conditions specified in Annex C.

All ballasts specified in this standard shall meet the requirements of IEC 61347-2-9 and

IEC 61347-1.

Attention is drawn to lamp performance standards which contain “information for ballast

design”. This information 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

ballasts.
5 Marking
The following additional marking is included, if appropriate:
Circuit power-factor, e.g. λ 0,85.
6 Ballasts designed to operate at various supply voltages

If a ballast is rated for more than one value of supply voltage, it shall comply with the relevant

clauses of this specification at all voltages for which it is marked. In case of a ballast with

taps, it is tested using the appropriate tappings.
7 Circuit power-factor

The measured circuit power-factor shall not differ from the marked value by more than 0,05

when the ballast is operated with one or more appropriate lamp(s) and the whole combination

is supplied at its rated voltage and frequency.
---------------------- Page: 12 ----------------------
60923  IEC:2005+A1:2006 – 17 –

In cases where a minimum value of the power-factor is required for a high power-factor

ballast, it shall be 0,85 measured under the conditions stated above. For these high power-

factor ballasts, the measured value shall in no case be less than 0,85.

NOTE The United States of America requires a power-factor of at least 0,9 for high power-factor ballasts.

8 Supply current

At rated voltage, the supply current shall not differ by more than 10 % from the value marked

on the ballast when the latter is operated with a reference lamp.
9 Current waveform
9.1 Lamp operating current waveform

The maximum ratio of peak value to root-mean-square (r.m.s.) value shall not exceed the

values in Table 1 when the ballast associated with a reference lamp is operated at its rated

voltage.
Table 1 – Lamp operating current waveform,
maximum ratio of peak value to r.m.s.
Lamp type Maximum ratio of peak value
to r.m.s.
High-pressure mercury 1,9
Low-pressure sodium 1,6
Metal halide Under consideration
High-pressure sodium 1,8

Deviating from this table, for ignitor circuits for low-pressure sodium lamps, the

maximum ratio of peak value to r.m.s. value of the lamp operating current shall not

exceed 2,0 for a short duration, e.g. <0,20 ms, and 1,8 for a longer duration.
9.2 Test procedure

The peak value of the lamp current shall be determined by means of a calibrated cathode-ray

oscilloscope, the resistor R being inserted in the earthed side of the circuit (see Figure 1).

This resistor shall have a sufficiently low value such that the voltage drop shall not exceed

0,5 % of the nominal lamp voltage.
The oscilloscope is connected with its earth connection on the supply side.

Care is taken to ensure a sufficiently low impedance of the supply for the different frequencies

involved. Moreover, the supply voltage distortion of maximum 3 % (see item c) of Clause C.2)

shall be taken into account when evaluating test results. In case of doubt a distortion-free

supply is used.
---------------------- Page: 13 ----------------------
60923  IEC:2005+A1:2006 – 19 –
1 2
Supply
C.R.O.
IEC 1324/05
1 = Ballast under test
2 = Reference lamp
Figure 1 – Measurement of current waveform
10 Magnetic screening

The ballast shall be effectively screened against the influence of adjacent ferro-magnetic

materials.
Compliance is checked by the following test.

The ballast is operated at rated voltage with an appropriate lamp. After stabilization, a steel

plate 1 mm thick and of length and breadth greater than those of the ballast under test shall

be successively moved into proximity and held at a spacing of 5 mm to each face of the

latter. During this operation, the lamp current is measured and this shall not change by

more than 2 % due to the presence of the steel plate.
11 Ignitors
Ignitors shall conform to the requirements of IEC 61347-2-1.
12 Electrical requirements for ballasts for high-pressure mercury vapour lamps
12.1 Ballast setting

The ballast shall limit the power and current delivered to a reference lamp to not less than

92,5 % for the power and not more than 115 % for the current of the corresponding values

delivered to the same lamp when operated with a reference ballast. Both the reference ballast

and the ballast under test shall have the same rated frequency and each shall be operated at

its rated voltage.

Moreover, for any other supply voltage between 92 % and 106 % of its rated value, the power

delivered by the ballast to the reference lamp shall lie between the limit of 88 % of the power

delivered to the same lamp by the reference ballast when supplied at 92 % of its rated voltage

and the limit of 109 % of the power delivered to the lamp by the reference ballast when

supplied at 106 % of its rated voltage.
---------------------- Page: 14 ----------------------
60923  IEC:2005+A1:2006 – 21 –

The tests are carried out with a circuit shown in Figure 2, switch S in the up position and

switch S successively operating the lamp from the reference ballast and the ballast under

test.
V 1
Supply
Supply
W A
IEC 1325/05
Key
1 = ballast under test
2 = reference ballast
3 = reference lamp

When measuring lamp wattage, no correction shall be made for the wattmeter consumption.

Instruments not in use are to be short-circuited or switched off. A method for securing rapid

switching of the lamp from one ballast to the other is under consideration.
Figure 2 – Circuit for testing ballasts for high-pressure mercury vapour
and low-pressure sodium vapour lamps
12.2 Short-circuit current

When the ballast is supplied at any voltage between 92 % and 106 % of its rated voltage, the

...

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