Amendment 1 - Lampholders for tubular fluorescent lamps and starterholders

Amendement 1 - Douilles pour lampes tubulaires à fluorescence et douilles pour starters

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IEC 60400:2017/AMD1:2020 - Amendment 1 - Lampholders for tubular fluorescent lamps and starterholders
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IEC 60400
Edition 8.0 2020-02
Lampholders for tubular fluorescent lamps and starterholders
Douilles pour lampes tubulaires à fluorescence et douilles pour starters
IEC 60400: 2017-06/AMD1:2020-02(en-fr)
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IEC 60400
Edition 8.0 2020-02
Lampholders for tubular fluorescent lamps and starterholders
Douilles pour lampes tubulaires à fluorescence et douilles pour starters
ICS 29.140.10 ISBN 978-2-8322-7895-6

Warning! Make sure that you obtained this publication from an authorized distributor.

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® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
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– 2 – IEC 60400:2017/AMD1:2020
© IEC 2020

This amendment has been prepared by subcommittee 34B: Lamp caps and holders, of IEC

technical committee 34: Lamps and related equipment.
The text of this amendment is based on the following documents:
FDIS Report on voting
34B/2072/FDIS 34B/2075/RVD

Full information on the voting for the approval of this amendment can be found in the report

on voting indicated in the above table.

The committee has decided that the contents of this amendment and the base publication will

remain unchanged until the stability date indicated on the IEC website under

"" in the data related to the specific publication. At this date, the

publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION to Amendment 1

Two changes needed for IEC 60400 became obvious during the work relating to Edition 8.0 of

IEC 60400.
Change 1:

Actual lamp holder safety standards require a ball pressure test in line with IEC 60695-10-2 in

sections “Resistance to heat, fire and tracking”. Within this test there is an alternative depth

indentation method described for the calculation of the indentation diameter.

This alternative calculation option was removed from the latest edition of IEC 60695-10-2

dated 2014 and during its meeting held in Sydney in 2018, SC 34B/WG1 agreed to delete the

alternative method as well from IEC 60400.
Change 2:
Based on IEC 60664-1:2007, "Non tracking materials":

"For glass, ceramics or other inorganic insulating materials which do not track, creepage

distances need not be greater than their associated clearance for the purpose of insulation

coordination. The dimensions of Table F.2 for inhomogeneous field conditions are
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IEC 60400:2017/AMD1:2020 – 3 –
© IEC 2020

This is not completely reflected in TC 34 standards as revised recently. For applications with

ELV it is of high importance whether the creepage distance shall be 0,6 mm or may be 0,2

mm in case where inorganic insulating material is used.

An informative annex for the explanation of U should give some additional information.

17 Creepage distances and clearances
Table 3

In the penultimate row of Table 3, insert, between the first paragraph starting with "Values for

creepage distances…" and the second paragraph starting with "In Japan…" the following new


For glass, ceramics or other inorganic insulating materials which do not track, creepage

distances need not be greater than their associated clearance for the purpose of insulation

coordination. The dimensions of this table are appropriate.
Add, at the end of Note 3 and before Table 4, the following new text:
Guidance for working voltages U can be found in Annex E.
18 Resistance to heat, fire and tracking

At the end of 18.2, delete the second sentence of the NOTE beginning with "In case of

Add, at the end of Annex D, the following new informative Annex E:
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– 4 – IEC 60400:2017/AMD1:2020
© IEC 2020
Annex E
Guidance on working voltages U
E.1 Working voltages – Relation between lampholders and controlgear

In recent years, an increasing number of controlgear used have been connected to the 250 V

mains, however, they generate an output voltage higher than the lampholder rated voltage.

According to IEC 61347-1 this higher output voltage is required to be marked as U on the


NOTE The typical application of lampholders according to this document is the 250 V mains voltage system, as

shown in the example below.
E.2 Example
E.2.1 Clearance

Lampholders having a rated voltage of 250 V for impulse withstand category II need a

clearance of 1,5 mm. The reason for this is the expected transient overvoltage of 2,5 kV.

E.2.2 Creepage distance
E.2.2.1 Voltage value

For creepage distances only r.m.s. values of the working voltages are taken into account,

provided the frequency of the voltage is less than 30 kHz.
E.2.2.2 Inorganic material that does not track

As for inorganic material, the creepage distance does not need to be longer than the

clearance of a ceramic lampholder with a rated voltage of 250 V and this lampholder can be

operated at a working voltage of maximum 1,5 kV r.m.s.

NOTE The value of 1,5 kV is based on (2 U + 1 000) V and is derived from the electric strength test.

E.2.2.3 Plastic material with a PTI ≥ 600
A voltage of 250 V needs a clearance of 1,5 mm.

A voltage of 250 V needs a creepage distance of 1,25 mm if the insulation material has

a PTI ≥ 600.

In lampholder standards, the required creepage distance can never be less than the

clearance, therefore, for a 250 V rated lampholder, the minimum creepage distance is also

1,5 mm.

For a 1,5 mm creepage distance, linear interpolation between the creepage distance for 250 V

and 500 V results in a voltage of 300 V.
The 1,5 mm clearance is associated with the maximum r.m.s. working voltage not
exceeding 300 V. Interpolation is not allowed for clearances.
Therefore, in the case of a plastic material with a PTI ≥ 600, l

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