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HARMONIZATION DOCUMENT
HD 638 S1/A1
DOCUMENT D'HARMONISATION
September 2006
HARMONISIERUNGSDOKUMENT
ICS 93.080.30
English version
Road traffic signal systems
Systèmes de signaux de circulation Straßenverkehrs-Signalanlagen
routière
This amendment A1 modifies the Harmonization Document HD 638 S1:2001; it was approved by CENELEC on
2006-09-01. CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which
stipulate the conditions for implementation of this amendment at national level.

Up-to-date lists and bibliographical references concerning such national implementations may be obtained on
application to the Central Secretariat or to any CENELEC member.

This amendment exists in three official versions (English, French, German).

CENELEC members are the national electrotechnical committees of Austria, Belgium, 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

Central Secretariat: rue de Stassart 35, B - 1050 Brussels

© 2006 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. HD 638 S1:2001/A1:2006 E

Foreword
This amendment to the Harmonization Document HD 638 S1:2001 was prepared by the CENELEC
BTTF 69-3, Road traffic signal systems. The text of the draft was submitted to the Unique Acceptance
Procedure and was approved by CENELEC as amendment A1 to HD 638 S1:2001 on 2006-09-01.
The following dates were fixed:
– latest date by which the existence of the amendment
has to be announced at national level (doa) 2007-03-01
– latest date by which the amendment has to be implemented
at national level by publication of an identical
national standard or by endorsement (dop) 2007-09-01
– latest date by which the national standards conflicting
with the amendment have to be withdrawn (dow) 2009-09-01
__________
- 3 - HD 638 S1:2001/A1:2006
2 Normative references
Add the following new reference:
EN 60950-1:2001 Information technology equipment – Safety – Part 1: General requirements
(IEC 60950-1:2001, modified)
3 Definitions
Add the following new definition:
3.3.17
insulation
see EN 60950-1,
...