HD 638 S1:2001

SLOVENSKI STANDARD
01-september-2002
Road traffic signal systems
Road traffic signal systems
Straßenverkehrs-Signalanlagen
Systèmes de signaux de circulation routière
Ta slovenski standard je istoveten z: HD 638 S1:2001
ICS:
93.080.30 Cestna oprema in pomožne Road equipment and
naprave installations
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

HARMONIZATION DOCUMENT HD 638 S1
DOCUMENT D'HARMONISATION
HARMONISIERUNGSDOKUMENT January 2001
ICS 93.080.30
English version
Road traffic signal systems
Systèmes de signaux de circulation Straßenverkehrs-Signalanlagen
routière
This Harmonization Document was approved by CENELEC on 2000-04-01. CENELEC members are
bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for
implementation of this Harmonization Document on a national level.
Up-to-date lists and bibliographical references concerning such national implementation may be obtained
on application to the Central Secretariat or to any CENELEC member.
This Harmonization Document exists in three official versions (English, French, German).
CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic,
Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway,
Portugal, 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
© 2001 CENELEC - All rights of exploitation in any form and by any means reserved worldwide for CENELEC members.
Ref. No. HD 638 S1:2001 E
Foreword
This Harmonization Document was prepared by the CENELEC Task Force BTTF 69-3 (TC 214 WG1),
Road traffic signal systems.
The text of the draft was submitted to the formal vote and was approved by CENELEC as HD 638 S1 on
2000-04-01.
The following dates were fixed:
– latest date by which the existence of the HD
has to be announced at national level (doa) 2000-10-01
– latest date by which the HD has to be implemented
at national level by publication of a harmonized
national standard or by endorsement (dop) 2001-08-01
– latest date by which the national standards conflicting
with the HD have to be withdrawn (dow) 2003-04-01
__________
- 3 - HD 638 S1:2001
Contents
Introduction. 4
1 Scope. 5
2 Normative references. 5
3 Definitions . 6
4 Electrical supply and limits . 9
5 Safety. 11
6 Testing. 19
7 Electrical interfaces. 26
8 Installation. 26
9 Maintenance . 29
10 Marking and labelling . 32
11 Classification of environmental test conditions . 33

Introduction
To satisfy the legal and regulatory requirements and specific provisions of each CENELEC country,
certain characteristics in this standard contain a range which is defined by a number of discrete classes.
The class to be used in the country will be selected by the Standards Authority of the CENELEC member
of that country from the range specified.
Thus this document contains the essential electrotechnical requirements of all CENELEC countries and
permits through the class selection procedure, countries to incorporate their own requirements.
It is believed that this first step will allow, over a period of time, a gradual alignment of Road Traffic
Signal Systems in Europe.
- 5 - HD 638 S1:2001
1 Scope
This standard specifies requirements for Road Traffic Signal Systems, including their development,
design, testing, installation and maintenance.
In particular, it forms the electrotechnical part of the following two standards issued by CEN:
EN 12368 Traffic control equipment – Signal heads
EN 12675 Traffic Signal Controllers – Functional safety requirements
Each of these standards above shall be used with this standard either singly or together to define an
operational equipment or system. This shall be achieved by using the electrotechnical methods and
testing defined in this standard.
Where Road Traffic Signal Systems are to be used with other systems e.g. public lighting or railway
signalling and communication, this standard shall comply with the other respective standard to ensure
that overall safety is not compromised.
Only permanently or temporarily installed Road Traffic Signal Systems are included in this standard.
Central office and portable signalling systems are not covered.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other publications.
These normative references are cited at the appropriate places in the text and the publications are listed
hereafter. For dated references, subsequent amendments to or revisions of any of these publications
apply to this European Standard only when incorporated in it by amendment or revision. For undated
references the latest edition of the publication referred to applies.
EN 12368 Traffic control equipment - Signal Heads
EN 12675 Traffic signal controllers – Functional safety requirements
EN 50102 1995 Degrees of protection provided by enclosures for electrical equipment
against external mechanical impacts (IK Code)
EN 50110-1 Operation of electrical installations
ENV 50129 Railway applications - Safety related electronic systems for signalling
EN 50293 Electromagnetic compatibility - Road traffic signal systems - Product
standard
EN 60529 1991 Degrees of protection provided by enclosures (IP Code)
+ corr. May 1993 (IEC 60529:1989)
EN 60598-1 Luminaires
Part 1: General requirements and tests (IEC 60598-1, mod)
EN 61008 series Electrical accessories
Residual current-operated circuit-breakers without integral overcurrent
protection for household and similar uses (RCCBs)
(IEC 61008 series, mod)
EN ISO 9001 Quality systems - Model for quality assurance in design/development,
production, installation and servicing
HD 384.2 International Electrotechnical Vocabulary
Chapter 826: Electrical installations of buildings (IEC 60050-826)
HD 384.4 series Electrical installations of buildings
Part 4: Protection for safety (IEC 60364-4 series, mod)

HD 384.5.54 1988 Electrical installations of buildings
Part 5: Selection and erection of electrical equipment
Chapter 54: Earthing arrangements and protective conductors
(IEC 364-5-54:1980, mod).
EN 60068-2-1 Environmental testing - Part 2: Tests;
Test A: Cold (IEC 60068-2-1)
EN 60068-2-2 Basic environmental testing procedures; Part 2: Tests;
Test B: Dry heat (IEC 60068-2-2 + IEC 60068-2-2A)
EN 60068-2-5 Environmental testing - Part 2: Tests;
Test Sa: Simulated solar radiation at ground level (IEC 60068-2-5)
EN 60068-2-14 Environmental testing - Part 2: Tests;
Test N: Change of temperature (IEC 60068-2-14)
EN 60068-2-30 Environmental testing - Part 2: Tests;
Tests Db and guidance: Damp heat, cyclic (12 + 12-hour cycle)
(IEC 60068-2-30)
EN 60068-2-64 Environmental testing - Part 2: Test methods - Test Fh: Vibration, broad
band random (digital control) and guidance (IEC 60068-2-64)
EN 60417 series Graphical symbols for use on equipment (IEC 60417 series)
IEC 60050-191 International Electrotechnical Vocabulary
Chapter 191: Dependability and quality of service
IEC 60536 1992 Classification of electrical and electronic equipment with regard to protection
against electric shock
3 Definitions
3.1 General
3.1.1
Road Traffic Signal Systems
include systems and devices, provided they are affiliated to them in terms of circuitry.
They may consist of the following elements which is not in itself a complete list:
Controllers
Signal heads, signalling devices and traffic signs,
e.g. signal heads for traffic signals,
acoustic signal generators,
mechanical signal generators,
traffic signs connected to the Road Traffic Signal System
Traffic sensors and detectors,
e.g. request push buttons,
vehicle detectors / Pedestrian Detectors
Monitoring equipment,
e.g. photographic monitoring devices
Equipment Enclosures
Electrical Supply
Cables
Interconnections
Supports
- 7 - HD 638 S1:2001
3.1.2
Failure Mode Analysis
a means of examining all failure modes to ensure that signal states endangering the road users and/or
risk of electrical hazard cannot occur during normal conditions of operation of a Road Traffic Signal
System or if they do occur under failure mode that they can not continue
3.1.3
Signal Safeguarding Facility
facilities intended to prevent states of signals endangering the traffic
3.1.4
monitoring element
device that signals electrical and mechanical states of equipment, preferably for signal circuits, and
which convert the obtained information in such a manner that it can be processed in signal safeguarding
facilities
3.1.5
hardware
the complete Road Traffic Signal System or a (material) part of it
3.1.6
hardware fault
failures of components and any influence that will cause the equipment to fail
NOTE  Systematic hardware faults constitute either design faults or systematic production faults.
3.1.7
software
all or part of the sequence instructions for a Road Traffic Signal System including the affiliated
documentation.
NOTE  Software is exclusively immaterial, so that it is subject to no wear or failure mechanisms. Once implemented, software cannot be
falsified on its own.
3.1.8
software error
deviation between the realised and intended functional contents of the software
NOTE  All errors in the software are systematic errors. They are caused by:
– invalid specification (incorrect formulation of intention)
– incorrect programming (incorrect translation of the specification to sequential instructions).
Apparent program falsification in memories is produced by hardware faults or failures or is caused by inadmissible
influencing.
3.2 Traffic engineering
3.2.1
controllers (traffic)
an electrical device to control signals
3.2.2
signal group
the sequence of conditions applied to a group of signal heads, which always received identical signal
light indications
3.2.3
Operating System
the principle software that allows a computer to operate. This software establishes the basic foundations,
protocols and functions that the computer can perform, including communication with internal and
external resources
3.2.4
Application Program
software that determines specific tasks that a computer can perform i.e. operate as a traffic controller.
Application software rests on and extends the capabilities of the operating system to meet customer
needs
3.2.5
Traffic Data
that data which specifies how the application program will perform in the particular circumstances of one
traffic system. This may be considered to be in 2 parts
3.2.5.1
Traffic Safety Data
is all Traffic Data stored in non-volatile memory that has a direct impact on the safety of road users
3.2.5.2
Traffic Non Safety Data
all the remainder of the data which will not cause an unacceptable danger to the road user if the data is
changed
3.2.6
Design Authority (Design Responsible)
the individual or group (organisation) responsible for the safe design and manufacturing, including the
instructions for safe use, installation and maintenance of the equipment or system
3.3 Electrotechnical
3.3.1
live part
See HD 384.2
3.3.2
enclosure (EN 50102)
a part providing protection of equipment against certain external influences and, in any direction
protection against contact
NOTE  This definition from the existing International Electrotechnical Vocabulary (HD 384.2) needs the following explanations under
the scope of this standard.
1) Enclosures provide protection of equipment against harmful effects of mechanical impacts and protection of persons and livestock
against access to hazardous parts.
2) Barriers, shapes of openings or any other means - whether attached to the enclosure or formed by the enclosed equipment -
suitable to prevent or limit the penetration of the specified test probes are considered as part of the enclosure, except when they
can be removed without the use of a tool.
3.3.3
complete protection
protection that achieves the following:
a) effective and durable prevention of contact with live parts by the attachment of obstacles at least
conforming to type of protection IP2x as defined in EN 60529;
or
b) complete enclosure of live parts by insulating material that can be removed only by destruction
(protection by insulating envelopment)
3.3.4
partial protection
protection that prevents the possibility of accidental contact by persons or by objects usually handled by
them in one of the following ways:
a) by placing live parts at a distance that the possibility of accidental contact by persons or objects
usually handled by them is excluded (protection against accidental contact by a safety clearance);
or
b) by att
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