L1-CHE-SPE-273 SIGNALLING AND COMMUNICATIONS CABLE APPLICATION GUIDELINES

Transcription

1 Engineering Specification Signalling L1-CHE-SPE-273 SIGNALLING AND COMMUNICATIONS CABLE APPLICATION GUIDELINES Version: 1

2 ENGINEERING SPECIFICATION SIGNALLING AND COMMUNICATIONS CABLE APPLICATION GUIDELINES L1-CHE-SPE-273 Version: 1 Effective from: 1 st July 2018 Approval Name Position Signature Document Endorser Louisa Waymouth Manager Standards Approving Manager Phil Ellingworth Chief Engineer Amendment Record Approval Date Version Description 20/06/ Rebadge VRIOGS Signalling and Communications Cable Application Guidelines. No change to the technical content. Approving Manager: Chief Engineer Approval Date: 20/06/2018 Next Review Date: 20/06/2021 PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 2 of 29

3 ENGINEERING SPECIFICATION SIGNALLING AND COMMUNICATIONS CABLE APPLICATION GUIDELINES L1-CHE-SPE-273 Version: 1 Effective from: 1 st July 2018 PREFACE This Specification replaces VRIOGS Signalling and Communications Cable Application Guidelines. The contents of this Specification were prepared by the Victorian Rail Industry Operators Group (VRIOG). This VRIOG Standard has been rebadged as an MTM document due to the retirement of VRIOG Standards as of 30 th June This Specification will be managed under the Engineering Standards Development Procedure (L1-CHE-PRO-032). As documents are uncontrolled once printed, it is imperative to check the currency of the Document on The Depot or the MTM s Document Portal which is available externally at All MTM Standards and Specifications are periodically reviewed, and new editions are published which incorporate learnings and Technical Notes (formerly known as Design Practice Notes). Technical Notes are issued between editions which correct any errors or ambiguities contained in an MTM Standard/Specifications. Standards and Specifications may also be withdrawn and/ or replaced. In the event of conflicts or discrepancies between different types of technical documents, refer to the order of precedence as defined in Chief Engineer s Guideline Engineering Standards Listing (L1-CHE-GDL-005). Note: Any clarification described in a Technical Note or Design Practice Note shall take precedence over the impacted clause or clauses in the associated MTM Standard/Specification. In the event a clause within a Standard/Specification is not achievable a waiver will need to be raised, please refer to the Engineering Waiver Procedure - L1-CHE-PRO-001. Note: MTM does not have the authority to grant waivers on any Standards/Specifications or clauses within a Standard/Specification which relate to Government Regulations or Legislation, e.g. Disability Discrimination Act. Referencing this document Clauses and subclauses of this document should be referenced using the following format style L1-CHE-XXX-YYY Clause Z.Z.Z. Referencing the VRIOGS document number is not required. Approving Manager: Chief Engineer Approval Date: 20/06/2018 Next Review Date: 20/06/2021 PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 3 of 29

4 ENGINEERING SPECIFICATION SIGNALLING AND COMMUNICATIONS CABLE APPLICATION GUIDELINES L1-CHE-SPE-273 Version: 1 Effective from: 1 st July 2018 THIS PAGE IS INTENDED TO BE BLANK Approving Manager: Chief Engineer Approval Date: 20/06/2018 Next Review Date: 20/06/2021 PRINTOUT MAY NOT BE UP-TO-DATE; REFER TO METRO INTRANET FOR THE LATEST VERSION Page 4 of 29

5 Victorian Rail Industry Operators Group Standards VRIOGS SIGNALLING CABLE APPLICATION GUIDELINES Revision: A Issue Date: 6/11/2009

6 ii VRIOGS Revision A VRIOGS Signalling Cable Application Guidelines Revision A Issue Date: 6/11/2009 APPROVAL STATUS APPROVER STATUS DATE QUALIFICATIONS Document Developer VRIOG Steering Committee Approved All Sections Accredited Rail Operator Metropolitan Train (Metro Trains Melbourne) Intrastate Train (V/Line) Interstate Train (ARTC) Tram (Yarra Trams) For any queries please contact vriogs@transport.vic.gov.au.

7 VRIOGS Revision A iii PURPOSE OF THE STANDARD The Standard has been created through the collaboration of members of the Victorian Rail Industry Operators Group (VRIOG) for the purpose of establishing standards which, if implemented throughout the Victorian Rail Network, will facilitate the interoperability of infrastructure. The use of the Standard is not prescribed by law but, if adopted, conformity with the provisions of the Standard is mandatory in order that the purpose of the Standard be achieved. DISCLAIMER The Standard is published by the Director of Public Transport for information purposes only and does not amount to any kind of advice. Each person is responsible for making his or her own assessment of all such information and for verifying such information. The content of this publication is not a substitute for professional advice. The Director of Public Transport and VRIOG accept no liability for any loss or damage to any person, howsoever caused, for information contained in this publication, or any purported reliance thereon. COPYRIGHT STATEMENT Director of Public Transport 2005 This publication is copyright. No part may be reproduced by any process except in accordance with the provisions of the Copyright Act. Where information or material is so used, it should be used accurately and the Standard should be acknowledged as the source of the information.

8 iv VRIOGS Revision A TABLE OF CONTENTS SECTION 1.0 CONVENTIONS...1 SECTION 2.0 DEFINITIONS...2 SECTION 3.0 SCOPE AND GENERAL Scope Application Background Specific References Australian Standards Conductor material Cable guidelines Spare cores for new works Spare cores for alteration works Voltage drop Constant current sources Maximum length Metallic Maximum length Local s Maximum length Multi-core through Cables Maximum length Risk assessment of EMI Maximum length Fibre optic Data losses...8 SECTION 4.0 CABLE APPLICATION Data s General Data s Application: SSI DLM copper link Internal wires / s General Internal wires / s Application: Rack to rack Internal wires / s Application: Circuit wiring External s General External s Application: Local cabling External s Application: Level crossing External s Application: Cable run External s Adverse recommendation: Small location Power s General Power s Application: High voltage distribution Power s Application: Low voltage distribution Earthing wires General Earthing s Application: Signalling equipment earthing Spark gap Bonding s...20 SECTION 5.0 REFERENCES...21

9 VRIOGS Revision A 1 SECTION 1.0 CONVENTIONS 1) Words or phrases that appear capitalised out of context are defined within the Definitions section of this VRIOG Standard. 2) The word Shall is to be understood as mandatory. 3) The word Should is to be understood as non-mandatory i.e. advisory or recommended. 4) Uncontrolled Standards may not be referenced within the VRIOG Standards. These include former PTC Standards, Franchisee Standards, Franchisee Subcontractor Standards and Infrastructure Lessee Standards. 5) Controlled Standards, including Australian Standards and other VRIOG Standards, may be referenced but only if: The referenced item can not be adequately explained with an amount of text that could not reasonably be inserted into the body of the Standard. The reader is not referenced to another Controlled Standard necessary for the item to be adequately explained i.e. one document link only. The referenced document is a Figure or table and could not reasonably be included in the appendices of the Standard. 6) The format employed in the VRIOG Standards is compatible with Australian Standards, and will be used from this point on. 7) The numbering system for the VRIOG Standards is chronologically sequential from the point of introduction, and is not based on any form of interpretive system. 8) The VRIOG Standards contain engineering information necessary to operate a safe Railway. VRIOG Standards will not contain any information that can be construed as a work instruction, procedure, process or protocol. This information forms the basis of each individual entity s Safety Accreditation Certification, and, as such, is outside the scope of VRIOG Standards.

10 2 VRIOGS Revision A SECTION 2.0 TERMINOLOGY Terminology used and/or applied in this Standard is defined as follows: Terminology ARO ARTC BER CBI DLM DMS DOT EMI Nomenclature PL PTC PTD Shielded ST Transformer VRIOGS Definition A Rail Infrastructure Manager or Rolling Stock Operator who is accredited under Part 5 of the Rail Safety Act Australian Rail Track Corporation Bit Error Ratio (Alternatively known as Bit Error Rate). Metric for measuring how reliable and accurate a digital communications link is. Computer Base Interlocking Data Link Module (for a Solid State Interlocking) VicTrack Drawing Management System Department of Transport Electromagnetic interference Naming Convention Protection Level as defined by AS 1768 Lightning Protection Public Transport Corporation The Public Transport Division of the Department of Transport Any constructed with twisted pairs and/or earth screening with an earth drain connection Transformer at a railway substation supplying the signalling power grid The Victorian Rail Industry Operators Group comprising the following members: Australian Rail Track Corporation (ARTC) Metro Trains Melbourne VicTrack V/Line Passenger Yarra Trams Public Transport Division (PTD) of the Department of Transport (DOT) Table 1 - Terminology

11 VRIOGS Revision A 3 SECTION 3.0 SCOPE AND GENERAL 3.1 SCOPE This Standard sets out guidelines for the use of various signalling s within the Victorian Railway Network. 3.2 APPLICATION This is a guideline, to assist design efforts in railway signalling within Victoria. Guidance provided here does not in any way override the following: 1) Designer responsibilities and obligations. 2) Mandatory requirements from any specified normative standards, including the VRIOG Standards and Australian Standards. 3.3 BACKGROUND This guideline replaces all previous documents relating to the application of s for particular purposes. These include, but are not limited to: 1) Public Transport Corporation (PTC) Signal Construction Manual 2) Public Transport Corporation (PTC) Signal Design Circulars 3.4 SPECIFIC REFERENCES AUSTRALIAN STANDARDS The following Australian Standards are relevant to designs involving s and wiring. The designer should pay particular attention to the elements listed below each Standard. The designer may need to consult these and other standards not listed in the course of design. 1) AS 3008 Part 1.1 Electrical installations Selection of s a) Current carrying capacity and voltage drop calculations, with the application of appropriate environmental conditions. 2) AS 3000 Electrical installations (also known as the Australian/New Zealand Wiring Rules) a) Wiring arrangements b) Earthing arrangements 3) AS 1768 Lightning protection a) Earthing arrangements 4) AS/ACIF S009 Installation requirements for customer cabling (Wiring rules) a) Separation between telecommunications s and other s

12 4 VRIOGS Revision A 3.5 CONDUCTOR MATERIAL All conductors referenced are to be assumed as copper, unless otherwise stated in the description. 3.6 CABLE GUIDELINES The guidelines are intended as an aid to the designer, and not to be interpreted as absolute directions with respects to engineering choices. The headings for the specification tables are described below: Heading Area Cores Description Reference Stranding per core Usage Explanation Nominal cross sectional area per core in square millimetres. This may not be exact, and is given only as a commonly understood reference. Designers should base calculations (eg voltage drop) on the stranding. Number of cores in the. Additional cores such as earth wires or power cores are noted as such. Generic description of the, primarily for identification and referencing purposes. If conductor is not copper, description will specify the material. VRIOGS reference for the Number and diameter of strands forming a single core High level description of what the could be used for Table 2 Cable specification headings 3.7 SPARE CORES FOR NEW WORKS The designer should ensure there is a minimum of 20% spare cores for s in location to location runs. This spare cores requirement does not apply to power, (CBI) data links or communication s. The 20% spare capacity should be applied to the sum of all cores within a group between every pair of connected locations (i.e. connected by the route). The spare capacity may be physically spread across multiple s in the same group.

13 VRIOGS Revision A 5 Location A Location C Location D 20% spare required Location B 20% spare required 20% spare required 20% spare required Location A Location B Location C Location D Figure 1 - Spare core allocations The designer should not transfer capacity from an adjacent group to make up the 20%. ie. the (say a 50 core ) between locations B and D can not transfer some spare cores to the spares requirement between location C and D. However, the 20% spare allocation between locations C and D can be spread across the s within that group. If the physical capacity of the is unable to accommodate the spare capacity, the designer should consider upsizing the or adding a new. 3.8 SPARE CORES FOR ALTERATION WORKS A reduced form of the spare cores requirement for new works should be applied here, ensuring that after the proposed modifications, a 10% spare cores requirement is satisfied. 3.9 VOLTAGE DROP The 10% VRIOGS voltage drop requirement should be interpreted in the following manner: 1) The requirement does not apply to the following two equipment categories: a) Communication links used for signalling purposes. Eg. SSI data links. b) Configurations specifically designed with a buffer for loss. eg. Axle counter at location box outputs 60V to drive a field asset that only requires a nominal 30V to function. In these cases, manufacturer s recommendations and engineering considerations should be applied. 2) Determined at the extremities of the system including local cabling to the field equipment.

14 6 VRIOGS Revision A 3) Requirement is applied to all signalling relay circuits as well as supply networks. 4) Maximum of 10% voltage drop relative to the worst case system supply voltage. 5) Worst case system supply voltage is the lowest working voltage at the feed point into the system supply. a) Example 1. A 2.2 kv distribution system s supply voltage is measured at the 2.2 kv secondary of the ST transformer at the substation. b) Example 2. If a box is fed through a 1 kv distribution system, the system supply voltage for the 110 V circuits is measured at the secondary of the 1 kv to 110 V transformer. c) Example 3. Within the same box, the system supply voltage for the 12 V circuits is measured at the output of the 110 V to 12 V converter. d) Example 4. If a second box is remotely fed from the 110 V supply in the box described in Example 2, the 110 V system supply voltage is still measured at the first box. The designer should not re-baseline the supply voltage at the second box to absorb the voltage drop in the 110 V supply run. 6) Calculations for any location (including field equipment via local cabling) should allow for maximum equipment loading, plus an additional power load margin for future expansion. a) Margin is 20% of designed power capacity for new works b) Margin is 10% of designed power capacity for alterations 3.10 CONSTANT CURRENT SOURCES The designer should be aware that circuits powered from constant current sources operate differently than those powered from constant voltage sources; the source voltage will change to accommodate variations in load and resistance. The limiting factor typically is the voltage range that the source can provide. Cable length calculations should account for this factor, if appli MAXIMUM CABLE LENGTH METALLIC Determinations of maximum lengths are subject to the following factors: 1) Voltage drop requirement 2) Cable construction and parameters, such as screening 3) Vulnerability of connected equipment to conducted electrical noise 4) Environmental conditions 5) Nearby EMI emitters a) Traction motors (interference is both directly radiated and conducted via the overhead/rail circuit) b) Substations of any type c) Commercial transmission lines running parallel to the run d) High density cluster of power s for services (yard lighting, building power, etc).

15 VRIOGS Revision A 7 The use of AS 3008 may be advantageous in terms of common usage for some of the above factors. The designer may choose to use the maximum length calculations to supplement the design documentation, in addition to the required voltage drop calculations Maximum length Local s Local s should be kept as short as possible, within practical limits, to reduce externally caused effects. A 200m limit should be observed for assets directly driven by an SSI s TFM through multi-core s; twisted s should be considered beyond that length Maximum length Multi-core through Cables There is no direct recommendation on this matter, other than to observe the voltage drop limit and minimise number of joints Maximum length Risk assessment of EMI An important historical caveat applies here. Failure due to EMI induced into vital circuits has not been traditionally considered a realistic event (in Victoria). The 200m limit on direct driven outputs from an SSI s TFM is a relatively new development. If a particular EMI emitter has been identified (on a case-by-case or project basis) as a possible risk, then it should be risk assessed. Possible mitigations include alterations to the run geometry and shielding MAXIMUM CABLE LENGTH FIBRE OPTIC Determinations of maximum lengths are subject to the following factors: 1) Transmission mode 2) Fibre optic material and construction 3) Installation method (including insertion losses due to interfaces and misalignment) 4) Wavelength distribution 5) Lowest satisfactory signal to noise ratio, or equivalently, maximum permissible losses. There is no specific guidance available on maximum length of fibre optic s. The designer should refer to the manufacturer specifications. The designer should also be aware that all active systems will require type approval (as a group or independently), including: 1) Primary transmit / receive system 2) Repeaters 3) Multiplexers

16 8 VRIOGS Revision A 3.13 DATA CABLE LOSSES There is no general guidance available on the maximum permissible data loss or BER (bit error ratio) of serialised data links. The designer is referred to both VRIOGS 12.3 (Computer Based Interlocking) and the relevant CBI manufacturer specifications. The relevant information may be presented in terms of: 1) Maximum possible length of a specified type 2) Maximum BER for an end-to-end link between two CBI objects 3) Lowest satisfactory signal to noise ratio 4) Other performance metric

17 VRIOGS Revision A 9 SECTION 4.0 CABLE APPLICATION 4.1 DATA CABLES GENERAL This guideline is appli for vital communications between CBI elements. These are expected to be dedicated links. The following types are to be used: Description Cores Stranding per core Area (mm 2 ) VRIOGS Referenc e Usage 4 pair signalling data 1 pair signalling data (Galvanised steel) 8 7/0.20mm /1.27mm Table 3 Data s General Vital communications link Vital communications link 4.2 DATA CABLES APPLICATION: SSI DLM COPPER LINK This application guideline applies to the copper link between SSI Data Link Modules at adjacent locations. The following s may be used for the relevant configuration: Application Cable type Notes SSI data link for DLMs 2c 1/1.27mm data (VRIOGS ) One pair per DLM bus per direction Table 4 Data s Application: SSI DLM copper link

18 10 VRIOGS Revision A 4.3 INTERNAL WIRES / CABLES GENERAL This guideline is appli for internal wiring within relay rooms and location boxes. It does not apply to the internal wiring inside self contained signalling assets such as signals and points (the designer is referred to the manufacturer specification for those situations). The following types can be used: Description Cores Stranding per core Area (mm 2 ) VRIOGS Reference Usage Insulated wire 1 24/0.20mm Internal wiring Twin 2 7/0.50mm Internal wiring Twin 2 7/0.85mm Internal wiring Insulated wire 1 50/0.25mm 2.5 Commercial Internal wiring Multi-core Multi-core 4 24/0.20mm 0.75 Commercial Internal wiring 10 24/0.20mm 0.75 Commercial Internal wiring Multi-core Multi-core 20 24/0.20mm 0.75 Commercial Internal wiring 50 24/0.20mm 0.75 Commercial Internal wiring Table 5 Internal s General For the cases where no VRIOGS specification is available, commercially available s / wires may be used, subject to approval by the Infrastructure Manager. The key features required of indoor s / wires are: 1) Flexibility a) High strand count b) Multi-core s should have a sufficiently flexible outer sheath 2) Doubly insulated for single wires 3) Insulation to remain stable under aging and typical railway temperatures 4) The requirements of VRIOGS can be used as a baseline for initial considerations.

19 VRIOGS Revision A INTERNAL WIRES / CABLES APPLICATION: RACK TO RACK This application guideline applies to rack to rack wiring within a relay room. The following s may be used for the relevant configuration: Application Cable type Notes Rack to rack wiring 4c, 10c, 20c, 50c 24/0.20mm multi-core s Wiring relays from one rack to another rack. Table 6 Internal s Application: Rack to rack 4.5 INTERNAL WIRES / CABLES APPLICATION: CIRCUIT WIRING This application guideline applies to circuit wiring within a location box or inside a relay room. It does not apply to the internal wiring inside self contained signalling assets such as signals and points (the designer is referred to the manufacturer specification for those situations). The following wires may be used for the relevant configuration: Application Cable type Notes Circuit wiring 1c 24/0.20mm insulated wire (VRIOGS ) 1c 50/0.25mm insulated wire 2c 7/0.50mm twin (VRIOGS ) 2c 7/0.85mm twin (VRIOGS ) Table 7 Relay Wiring Wiring relay contacts and terminations. Point to point wiring of low current devices at location that does not require specialised features (eg shielding). Use for high current circuit paths.

20 12 VRIOGS Revision A 4.6 EXTERNAL CABLES GENERAL This guideline is appli for external signalling connections between two locations or between a location and nearby field assets. This guideline does not cover data s for CBIs. The following types can be used: Description Cores Stranding per core Area (mm2) VRIOGS Reference Usage Shielded twin Twisted 2 pair Twisted 6 pair 2 7/0.50mm /0.50mm /0.50mm Twin 2 7/0.50mm Quad 4 7/0.50mm Multi-core Multi-core Multi-core Multi-core Multi-core 10 7/0.50mm /0.50mm & 7/0.85mm 1.5 & /0.50mm /0.20mm /0.50mm Twin 2 7/0.85mm Quad 4+E 7/1.35mm & 7/0.67mm 10 & Twin 2 7/1.70mm Twisted twin 2 7/1.70mm Shielded local run for EMI sensitive applications. Designer should take the durability of this smaller into account in external applications. Shielded local run for EMI sensitive applications Shielded local run for EMI sensitive applications Local run for low power circuit. Designer should take the durability of this smaller into account in external applications. Local or extended run for low power circuits Local or extended run for low power circuits Extended run for low power circuits Extended run for low power circuits Extended run for low power circuits Extended run for low power circuits Local run for medium current applications Local run for medium current applications Local run for high current applications Track connections - signalling Table 8 External Cables General

21 VRIOGS Revision A EXTERNAL CABLES APPLICATION: LOCAL CABLING This application guideline applies to local cabling from a location box or relay room to nearby field assets. Cable types shaded in grey represent non-preferred choices, where the external environment poses no EMI threat to the connected interlocking assets (for instance, a relay interlocking is used rather than potentially sensitive CBI equipment). In the physically congested inner areas, and where CBI used, twisted pairs should be given consideration. In regional areas, there may be no issues with using straight cores. The following s may be used for the relevant configuration: Application Cable type Notes LED multi-lens signal LED tricolour signal LED fixed light LED low speed light LED dwarf signal Point machine Train stop 4c 7/0.50mm twisted 2 pairs (VRIOGS ) 12c 7/0.50mm twisted 6 pairs (VRIOGS ) 10c 7/0.50mm multi-core (VRIOGS ) 12c 7/0.50mm twisted 6 pairs (VRIOGS ) 10c 7/0.50mm multi-core (VRIOGS ) 4c 7/0.50mm twisted 2 pairs (VRIOGS ) 2c 7/0.85mm twin (VRIOGS ) 4c 7/0.50mm twisted 2 pairs (VRIOGS ) 2c 7/0.85mm twin (VRIOGS ) 4c 7/0.50mm twisted 2 pairs (VRIOGS ) 12c 7/0.50mm twisted 6 pairs (VRIOGS ) 10c 7/0.50mm multi-core (VRIOGS ) 12c 7/0.50mm twisted 6 pairs (VRIOGS ) 10c 7/0.50mm multi-core (VRIOGS ) 20c 7/0.50mm multi-core (VRIOGS ) 2c 7/0.85mm twin (VRIOGS ) 2c 7/1.70mm twin (VRIOGS ) 12c 7/0.50mm twisted 6 pairs (VRIOGS ) 10c 7/0.50mm multi-core (VRIOGS ) One pair of twisted cores to be used per colour per signal arm. One per signal arm. Choice depends on EMI susceptibility and whether current detection is required. Allow for capacity to upgrade from two lights to three lights. Used for low current detection circuits. Used for points drive, as appropriate for voltage drop requirements. Used for low current detection circuits.

22 14 VRIOGS Revision A Application Cable type Notes Jointless track circuits (electrified area only) 2c 7/0.85mm twin (VRIOGS ) 2c 7/1.70mm twin (VRIOGS ) 10c + 2c 7/0.50mm & 7/0.85mm multi-core (VRIOGS ) 2c 7/0.50mm shielded twin (VRIOGS ) 4c 7/0.50mm twisted 2 pair (VRIOGS ) 12c 7/0.50mm twisted 6 pair (VRIOGS ) Used for train stop drive, as appropriate for voltage drop requirements. Combined for drive and detection, if the voltage for drive circuit is sufficient. Cable from location box to matching transformer. Each connection requires a single pair. Multiple pairs of the same type (TX or RX) can share a, provided they carry different frequencies. Other track circuits Axle counters For track connection from matching transformer, refer to VRIOGS 10.7 Standard Track Bonding, track circuit connections and traction interfaces standard. For high voltage impulse, AC, DC and WESTRAK track circuits, refer to VRIOGS 10.7 Standard Track Bonding, track circuit connections and traction interfaces standard. Refer to manufacturer s specifications for internal wiring. 4c 7/0.50mm twisted 2 pair External to counter head (VRIOGS ) Table 9 External Cables Local Cabling

23 VRIOGS Revision A EXTERNAL CABLES APPLICATION: LEVEL CROSSING This application guideline applies from the FCR/FGR location box to the level crossing masts. The designer may wish to use shielded or twisted s if the control device s interface is sensitive to conducted EMI received by straight cores. The following s may be used for the relevant configuration: Application Cable type Notes LED flashing lights LED boom arm lights Bell Boom control Boom motor Healthy state indicator 4c 7/0.50mm quad (VRIOGS ) 4c 7/0.50mm quad (VRIOGS ) 2c 7/0.85mm twin (VRIOGS ) 10c 7/0.50mm multi-core (VRIOGS ) 2c 7/1.70mm twin (VRIOGS ) 2c 7/0.85mm twin (VRIOGS ) Per application of the standard 4 lights configuration (2 front lights and 2 back lights) Per application of the standard 2 lights configuration for side streets Table 10 External Cables Level Crossings 4.9 EXTERNAL CABLES APPLICATION: CABLE RUN This application guideline applies to runs from location to location. The following s may be used, as required by design constraints. Application Cable type Notes Cable run 20c 7/0.50mm multi-core (VRIOGS ) 50c 7/0.50mm multi-core (VRIOGS ) 50c 24/0.20mm multi-core (VRIOGS ) The 20% spare cores rule should be observed. Table 11 External Cables Cable Run

24 16 VRIOGS Revision A 4.10 EXTERNAL CABLES ADVERSE RECOMMENDATION: SMALL LOCATION This adverse recommendation applies to the powering of a small location. It is not recommended that a small location be powered through a 10+2c 7/0.50mm multi-core (VRIOGS ). The small number of signalling cores and low current capacity of the power cores substantially limits the future expansion capacity of the location POWER CABLES GENERAL This guideline is appli for both high voltage and low voltage power s. The designer is responsible for the choice of, particularly in respects to size being sufficient for the required currents. If the sizes listed here are identified as being insufficient for a given application, engineering alternatives should be sought. They include sharing current over parallel cores, adjusting run length, altering the load distribution, or changing the distribution scheme. The spare cores requirement does not directly apply to power s. However, the should be capable of carrying an additional load margin for future expansion: 1) Margin is at least 20% of designed power capacity for new works 2) Margin is at least 10% of designed power capacity remaining after alterations If the margin can not be met, the designer should consider re-designing for a higher capacity. The following types can be used: Description Cores Stranding per core 1kV Underground type power 2.2kV Underground type power 6.6kV Underground type power Area (mm 2 ) VRIOGS Reference 3 N/A 25* /1.70mm N/A 16* Twin 2 7/1.70mm Twin power 2 19/1.35m m Usage High voltage distribution, three phase High voltage distribution, single phase High voltage distribution, single phase Local run for high current applications Local power distribution

25 VRIOGS Revision A 17 Twin power 2 19/1.78m m Local power distribution Table 12 Power Cables - General NOTE (Asterisks): VRIOGS does not specify a specific stranding, only the cross-sectional area per core POWER CABLES APPLICATION: HIGH VOLTAGE DISTRIBUTION This application guideline applies to the high voltage distribution runs between HV locations. The following s may be used, as required by design constraints: Application Cable type Notes 1 kv, 3 phase 3c 25mm 2 1 kv power (VRIOGS ) 2.2 kv, single phase 2c 7/1.70mm 2.2 kv power (VRIOGS ) 6.6 kv, single phase 2c 16mm kv power (VRIOGS ) High voltage distribution High voltage distribution High voltage distribution Table 13 Power Cables High Voltage Distribution 4.13 POWER CABLES APPLICATION: LOW VOLTAGE DISTRIBUTION This application guideline applies to the low voltage distribution runs between signalling locations. The following s may be used, as required by design constraints: Application Cable type Notes 110V, single phase 2c 7/1.70mm twin (VRIOGS ) 110V or 450V, single phase 2c 19/1.35mm twin power (VRIOGS ) 2c 19/1.78mm twin power (VRIOGS ) Low voltage distribution Low voltage distribution Table 14 - Power Cables High Voltage Distribution

26 18 VRIOGS Revision A 4.14 EARTHING WIRES GENERAL This application guideline applies to the earthing of signalling equipment at either a location box or a relay room. With respects to earth wiring, the designer should consult VRIOGS 12.2, AS 1768 and AS 3000 in parallel EARTHING CABLES APPLICATION: SIGNALLING EQUIPMENT EARTHING 1. This application guideline applies to the connection of signalling equipment to the main earth bus bar, and from the main earth bus bar to the earth grid. 2. The designer should be aware of the dependency of surge and transient protection systems on a properly engineered earthing system. An earthing system with high impedance at high frequencies may satisfy the maximum resistance test but fail to provide the level of protection required. 3. The designer should therefore use AS 1768 to form an earthing system capable of supporting lightning and surge protection devices (eg gas arrestors), as required by VRIOGS. 4. The level of AS 1768 protection (PL I, II, III or IV) required should be negotiated with all relevant stakeholders, in particular the Infrastructure Manager of the network affected. 5. The risk assessment undertaken to satisfy AS 1768 should consider at a minimum: a) Geometry of conductors in the primary discharge path, accounting for the maximum expected strike currents i. In particular, diameter and length of earthing s b) Potential for direct and indirect (induced) damage to equipment c) Parallel or conflicting requirements in using the earth system as protective earth 6. This application guideline is not intended as an overview of how to apply AS 1768, but rather highlight where earthing is involved with respect to AS The designer is advised to consider the lightning protection system as a whole, of which earthing is but one component.

27 VRIOGS Revision A The following s may be used, as required by design constraints: Application Cable type Notes Signalling equipment earthing 7/1.70mm copper wire with green/yellow PVC insulation 7/1.70mm is the absolute minimum. The designer should not interpret that specifying 7/1.70mm will be sufficient. Rather, the designer is referred to AS 1768 risk assessment process to determine the required sizing. Sizing of conductors should account for the 20% spare cores in power distribution, in the event it is used. Lengths to be sufficiently short to satisfy the required AS 1768 protection level. Earthing should be physically separated from other s, and where crossing is necessary, the s should be crossed at ninety degrees. Table 15 - Earthing s Signalling equipment earthing 4.16 SPARK GAP CABLE For specific applications, refer to VRIOGS 10.7 Standard Track Bonding, Track Circuit Connections and Traction Interfaces standard. The following types can be used: Description Cores Stranding per core Area (mm 2 ) VRIOGS Reference Usage Spark gap (Aluminium) 1 19/2.45m m or equivalent Over voltage protection Table 16 - Spark gap

28 20 VRIOGS Revision A 4.17 BONDING CABLES For specific applications, refer to VRIOGS 10.7 Standard Track Bonding, Track Circuit Connections and Traction Interfaces standard. The following types can be used: Description Bonding Flexible bonding Bonding Flexible bonding Bonding Flexible traction return (Aluminium) Cores Stranding per core Area (mm 2 ) VRIOGS Reference 1 19/2.14mm /0.5mm /1.53mm /0.5mm /0.5mm or 5881/0.2mm or equivalent /0.50mm Table 17 - Bonding s Usage Traction return bonding Traction return bonding Traction return bonding Traction return bonding Traction return bonding Traction return bonding

29 VRIOGS Revision A 21 SECTION 5.0 REFERENCES 1. VRIOGS 12.1 Standard for Signalling Design and Documentation 2. VRIOGS 12.2 Signalling Supply, Construction and Installation 3. VRIOGS 10.7 Standard Track Bonding, Track Circuit Connections and Traction Interfaces 4. VRIOGS 12.3 Computer Based Interlocking 5. Australian Standard AS 1768 Lightning Protection 6. Australian Standard AS/ACIF S009 Installation requirements for customer cabling (Wiring Rules) 7. Australian Standard AS 3000 Wiring Rules 8. Australian Standard AS 3008 Selection of s