BS EN 50556:2018 – TC:2020 Edition
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Tracked Changes. Road traffic signal systems
| Published By | Publication Date | Number of Pages |
| BSI | 2020 | 105 |
This document 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 will be used with this standard either singly or together to define an operational equipment or system. This will 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 document will be used with any other respective standard(s) for the other associated systems to ensure that overall safety is not compromised. This document is applicable to traffic signal control equipment permanently and temporarily installed, and portable traffic control equipment, with the exception of portable traffic signal equipment only capable of controlling alternate / shuttle working lanes (as further defined in 3.2.10).
PDF Catalog
| PDF Pages | PDF Title |
|---|---|
| 55 | undefined |
| 63 | 1 Scope 2 Normative references |
| 64 | 3 Terms and definitions |
| 72 | 4 Electrical supply and limits 4.1 Nominal voltages 4.2 Operating voltage range |
| 73 | 4.3 Low voltage 4.3.1 Auxiliary state switch response voltage (Vaux) 4.3.2 Power up activation voltage 4.4 Overvoltage 4.5 Voltage dip |
| 74 | 4.6 Mains frequency 5 Safety 5.1 Electrical safety 5.1.1 General 5.1.1.1 Introduction 5.1.1.2 Criteria − Leakage current 5.1.1.3 Protective Earthing |
| 75 | 5.1.1.4 Enclosure 5.1.1.5 Access 5.1.1.6 Over-current protection 5.1.1.7 Terminations 5.1.2 Controller Signal outputs |
| 76 | 5.1.3 Interconnections 5.1.3.1 PE Terminal 5.1.3.2 General terminations 5.1.4 Cables 5.1.4.1 PE cable dimensions 5.1.4.2 Earth cable dimensions |
| 77 | 5.1.4.3 Distribution cables 5.1.5 Insulation 5.1.5.1 Isolated circuits 5.1.5.2 Linked circuits 5.1.5.3 Insulation paths 5.1.5.4 Insulated devices |
| 78 | 5.2 Traffic safety 5.2.1 General 5.2.2 Requirements of signal intensity for safety 5.2.3 Requirements for signal states |
| 80 | 5.2.4 Failure consideration (Failure mode analysis) 5.2.4.1 General 5.2.4.2 First Single Failure (Failure A) 5.2.4.3 Second Single Failure (Failure B) |
| 83 | 5.2.5 Location of monitoring elements for signals 5.2.5.1 General 5.2.5.2 Location of monitoring elements for detection of absent signals 5.2.5.3 Performance of monitoring elements for detection of unwanted displays 6 Testing 6.1 Object 6.2 Organization of testing 6.2.1 Ordering of tests |
| 84 | 6.2.2 Presentation of equipment |
| 85 | 6.3 Environmental tests 6.3.1 General conditions for the tests |
| 86 | 6.3.2 Random vibration test (in accordance with EN 60068264) 6.3.3 Impact tests 6.3.4 Degree of protection (in accordance with EN 60529) |
| 87 | 6.3.5 Dry heat (in accordance with EN 6006822) 6.3.6 Cold (in accordance with EN 6006821) 6.3.7 Damp heat (in accordance with EN 60068230) 6.3.8 Solar radiation (in accordance with EN 6006825) |
| 88 | 6.4 Electrical tests 6.4.1 Scope of electrical compatibility tests 6.4.2 Output to signal heads 6.4.3 External input tests 6.4.4 External output tests |
| 89 | 6.4.5 Communications interface circuits 6.5 Electrical safety tests 6.5.1 General 6.5.2 Typical test conditions 6.5.3 Protective conductors continuity test 6.5.3.1 Inspection 6.5.3.2 Measurement 6.5.4 Labelling |
| 90 | 6.5.5 Access to hazardous voltages 6.5.6 Protection against fire risks 6.5.7 Test of residual current protection means for the installation 6.5.8 Test of residual current protection means for maintenance supplies 6.5.9 Electrical strength test 6.6 Traffic safety tests 6.6.1 Safety tests (EN 12675) |
| 91 | 6.6.2 Undervoltage tests 6.6.3 Power up activation voltage test 6.6.4 Overvoltage test 6.6.5 Power supply voltage dips 6.7 Electromagnetic compatibility testing |
| 92 | 7 Electrical interfaces 7.1 General 7.2 Detector interface 8 Installation 8.1 General |
| 93 | 8.2 Tests carried out during installation 8.3 Test of cables following the installation of cables 8.4 Inspection of terminations following the installation and termination of all equipment and cables |
| 94 | 8.5 Test of impedance 8.5.1 Protective conductors continuity 8.5.2 Earth impedance test 8.5.3 Fault loop impedance test 8.6 Insulation of live parts to earth |
| 95 | 8.7 RCD (residual current device / earth leakage breaker) 8.8 Fuses 8.9 Voltage and polarity of supply 8.10 Connections between controllers, signals and ancillary equipment 8.11 Safety covers 8.12 Functional check of road traffic signal systems |
| 96 | 9 Maintenance 9.1 General 9.2 Types of maintenance 9.3 Documentation required for maintenance |
| 97 | 9.4 Equipment not covered by this standard 9.5 Safety testing procedures |
| 98 | 9.6 Maintenance testing procedures |
| 99 | 10 Marking and labelling |
| 100 | 11 Classification of environmental test conditions |
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BS EN 50556:2018
Road traffic signal systems Published By Publication Date Number of Pages BSI 2018 52
