EN 50556:2018

Road traffic signal systems

EN 50556:2018

Name:EN 50556:2018   Standard name:Road traffic signal systems
Standard number:EN 50556:2018   language:English language
Release Date:27-Sep-2018   technical committee:CLC/BTTF 69-3 - Road traffic
Drafting committee:CLC/BTTF 69-3 - Road traffic   ICS number:93.080.30 - Road equipment and installations

SLOVENSKI STANDARD
01-julij-2019
Nadomešča:
SIST EN 50556:2011
Sistemi prometne signalizacije
Road traffic signal systems
Straßenverkehrs-Signalanlagen
Systèmes de signaux de circulation routière
Ta slovenski standard je istoveten z: EN 50556:2018
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.

EUROPEAN STANDARD
EN 50556
NORME EUROPÉENNE
EUROPÄISCHE NORM
September 2018
ICS 93.080.30 Supersedes EN 50556:2011
English Version
Road traffic signal systems
Systèmes de signaux de circulation routière Straßenverkehrs-Signalanlagen
This European Standard was approved by CENELEC on 2017-12-18. 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 CEN-CENELEC
Management Centre 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 CEN-CENELEC Management Centre 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.

European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2018 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
Ref. No. EN 50556:2018 E
Contents Page
European foreword . 6
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Electrical supply and limits . 17
4.1 Nominal voltages . 17
4.2 Operating voltage range . 17
4.3 Low voltage . 18
4.3.1 Auxiliary state switch response voltage (V ) . 18
aux
4.3.2 Power up activation voltage . 18
4.4 Overvoltage . 18
4.5 Voltage dip . 18
4.6 Mains frequency . 19
5 Safety . 19
5.1 Electrical safety . 19
5.1.1 General . 19
5.1.2 Controller Signal outputs . 20
5.1.3 Interconnections . 21
5.1.4 Cables . 21
5.1.5 Insulation . 22
5.2 Traffic safety . 23
5.2.1 General . 23
5.2.2 Requirements of signal intensity for safety . 23
5.2.3 Requirements for signal states . 23
5.2.4 Failure consideration (Failure mode analysis) . 25
5.2.5 Location of monitoring elements for signals . 28
6 Testing . 28
6.1 Object . 28
6.2 Organization of testing . 28
6.2.1 Ordering of tests . 28
6.2.2 Presentation of equipment . 29
6.3 Environmental tests. 30
6.3.1 General conditions for the tests . 30
6.3.2 Random vibration test (in accordance with EN 60068-2-64) . 31
6.3.3 Impact tests . 31
6.3.4 Degree of protection (in accordance with EN 60529) . 31
6.3.5 Dry heat (in accordance with EN 60068-2-2) . 32
6.3.6 Cold (in accordance with EN 60068-2-1) . 32
6.3.7 Damp heat (in accordance with EN 60068-2-30) . 32
6.3.8 Solar radiation (in accordance with EN 60068-2-5) . 32
6.4 Electrical tests . 33
6.4.1 Scope of electrical compatibility tests . 33
6.4.2 Output to signal heads . 33
6.4.3 External input tests . 33
6.4.4 External output tests . 33
6.4.5 Communications interface circuits . 34
6.5 Electrical safety tests . 34
6.5.1 General . 34
6.5.2 Typical test conditions . 34
6.5.3 Protective conductors continuity test . 34
6.5.4 Labelling . 34
6.5.5 Access to hazardous voltages . 35
6.5.6 Protection against fire risks . 35
6.5.7 Test of residual current protection means for the installation . 35
6.5.8 Test of residual current protection means for maintenance supplies . 35
6.5.9 Electrical strength test . 35
6.6 Traffic safety tests . 35
6.6.1 Safety tests (EN 12675) . 35
6.6.2 Undervoltage tests . 36
6.6.3 Power up activation voltage test . 36
6.6.4 Overvoltage test . 36
6.6.5 Power supply voltage dips . 36
6.7 Electromagnetic compatibility testing . 36
7 Electrical interfaces . 37
7.1 General . 37
7.2 Detector interface . 37
8 Installation . 37
8.1 General . 37
8.2 Tests carried out during installation . 38
8.3 Test of cables following the installation of cables . 38
8.4 Inspection of terminations following the installation and termination of all equipment and
cables . 38
8.5 Test of impedance . 39
8.5.1 Protective conductors continuity . 39
8.5.2 Earth impedance test . 39
8.5.3 Fault loop impedance test . 39
8.6 Insulation of live parts to earth . 39
8.7 RCD (residual current device / earth leakage breaker) . 40
8.8 Fuses . 40
8.9 Voltage and polarity of supply . 40
8.10 Connections between controllers, signals and ancillary equipment . 40
8.11 Safety covers .
...

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