BS EN 50556:2011 pdf download – Road traffic signal systems The Road Traffic Signal System shall conform to HD 384.4 series. This subclause deals with the additionalrequirements for Road Traffic Signal Systems. 5.1.1.2Criteria -Leakage current 5.1.1.2.1 Road Traffic Signal SystemsClass T1: For Road Traffic Signal Systems, leakage current protection facilities conforming to HD 384.4.41 shall befitted.Earth leakage circuit breakers conforming to EN 61008 series for nominal currents 20 % greater thanthe expected current and nominal leakage currents ≤0,3 A shall be installed. Class T2: No requirement for leakage current protection facilities for the whole system, however the customer mayrequest facilities as class T1. 5.1.1.2.2 Maintenance equipment supply To conform with HD 60364-4-41,an earth leakage circuit breaker conforming to EN 61008 series withnominal leakage currents ≤ 0,03 A shall be installed. 5.1.1.3 Earthing 5.1.1.3.1General This subclause applies to the installation or part of the installation which is class I conforming to EN 61140.5.1.1.3.2Protective earth conductor (PE) The system shall conform to HD 60364-5-54. Protective earth conductors shall connect together all conductive parts and the PE terminals throughout thesystem. They shall either be created by conductors in a cable or by separately installed wires andlorconstruction parts. ln controllers the PE conductors shall be connected to the PE terminal / earth bus bar. NOTE Metallic bodies which, by virtue of their location or smallness,cannot be touched or are ulikely to become live should bedesignated excluded devices, i.e. they need not be connected to the PEconductor. 5.1.1.3.3PE wiring of external equipment NOTE 1 Examples of external equipment are poles, signal heads and detectors.The system shall be classified according to the following methods. Accessible conductive parts shall be connected to the PE conductors incorporated in the cables or a separatePE cable. NOTE2 Armouring of cables may also be used as PE conductors where the cable construction permits. 5.1.1.4Enclosure The enclosure shall provide the mechanical protection to K07(see EN 50102) with the following criteria:No damage shall occur to the equipment contained within the enclosure and the equipment shall continue tooperate to its specification.There shall be no degradation of the lP rating of the equipment. Class V1: Enclosures shall provide protection to lP44.When the manual panel is open, the protection provided shall beto lP42. When the enclosure is open the protection shall be to IP20. Class V2: Enclosures shall provide protection to lP54.When the manual panel is open, the protection provided shall beto lP23. When the enclosure...

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