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© State of NSW through Transport for NSW 2020
Overhead Wiring Layouts
T HR EL 08014 ST
Standard
Version 1.0
Issue date: 26 June 2020
T HR EL 08014 ST Overhead Wiring Layouts
Version 1.0 Issue date: 26 June 2020
© State of NSW through Transport for NSW 2020
Important message This document is one of a set of standards developed solely and specifically for use on
Transport Assets (as defined in the Asset Standards Authority Charter). It is not suitable for any
other purpose.
The copyright and any other intellectual property in this document will at all times remain the
property of the State of New South Wales (Transport for NSW).
You must not use or adapt this document or rely upon it in any way unless you are providing
products or services to a NSW Government agency and that agency has expressly authorised
you in writing to do so. If this document forms part of a contract with, or is a condition of
approval by a NSW Government agency, use of the document is subject to the terms of the
contract or approval. To be clear, the content of this document is not licensed under any
Creative Commons Licence.
This document may contain third party material. The inclusion of third party material is for
illustrative purposes only and does not represent an endorsement by NSW Government of any
third party product or service.
If you use this document or rely upon it without authorisation under these terms, the State of
New South Wales (including Transport for NSW) and its personnel does not accept any liability
to you or any other person for any loss, damage, costs and expenses that you or anyone else
may suffer or incur from your use and reliance on the content contained in this document. Users
should exercise their own skill and care in the use of the document.
This document may not be current and is uncontrolled when printed or downloaded. Standards
may be accessed from the Transport for NSW website at www.transport.nsw.gov.au
For queries regarding this document, please email the ASA at [email protected] or visit www.transport.nsw.gov.au
T HR EL 08014 ST Overhead Wiring Layouts
Version 1.0 Issue date: 26 June 2020
© State of NSW through Transport for NSW 2020 Page 3 of 26
Standard governance
Owner: Lead Electrical Engineer, Asset Standards Authority
Authoriser: Chief Engineer, Asset Standards Authority
Approver: Executive Director, Asset Standards Authority on behalf of the ASA Configuration Control Board
Document history
Version Summary of changes
1.0 First issue
T HR EL 08014 ST Overhead Wiring Layouts
Version 1.0 Issue date: 26 June 2020
© State of NSW through Transport for NSW 2020 Page 4 of 26
Preface The Asset Standards Authority (ASA) is a key strategic branch of Transport for NSW (TfNSW).
As the network design and standards authority for NSW Transport Assets, as specified in the
ASA Charter, the ASA identifies, selects, develops, publishes, maintains and controls a suite of
requirements documents on behalf of TfNSW, the asset owner.
The ASA deploys TfNSW requirements for asset and safety assurance by creating and
managing TfNSW's governance models, documents and processes. To achieve this, the ASA
focuses on four primary tasks:
• publishing and managing TfNSW's process and requirements documents including TfNSW
plans, standards, manuals and guides
• deploying TfNSW's Authorised Engineering Organisation (AEO) framework
• continuously improving TfNSW’s Asset Management Framework
• collaborating with the Transport cluster and industry through open engagement
The AEO framework authorises engineering organisations to supply and provide asset related
products and services to TfNSW. It works to assure the safety, quality and fitness for purpose of
those products and services over the asset's whole-of-life. AEOs are expected to demonstrate
how they have applied the requirements of ASA documents, including TfNSW plans, standards
and guides, when delivering assets and related services for TfNSW.
Compliance with ASA requirements by itself is not sufficient to ensure satisfactory outcomes for
NSW Transport Assets. The ASA expects that professional judgement be used by competent
personnel when using ASA requirements to produce those outcomes.
About this document
This document sets out the technical requirements for the layout drawings of 1500 V dc
overhead wiring in the TfNSW Metropolitan Heavy Rail Network.
This standard supersedes the RailCorp document EP 08 00 00 10 SP Overhead Wiring Layouts
– Requirements and Symbology, version 2.1.
The changes to previous content include the following:
• updates to reflect organisational changes and resulting changes in responsibilities
• replacement of contents that are covered by T MU MD 00006 ST Engineering Drawings
and CAD Requirements, T MU MD 00006 R6 Electrical CAD Resources and
T MU MD 00006 R2 Track CAD Resources by references to those standards
• minor amendments and clarification to content
• conversion of the standard to ASA numbering, format and style
T HR EL 08014 ST Overhead Wiring Layouts
Version 1.0 Issue date: 26 June 2020
© State of NSW through Transport for NSW 2020 Page 5 of 26
This standard is a first issue.
T HR EL 08014 ST Overhead Wiring Layouts
Version 1.0 Issue date: 26 June 2020
© State of NSW through Transport for NSW 2020 Page 6 of 26
Table of contents 1. Introduction .............................................................................................................................................. 7
2. Purpose .................................................................................................................................................... 7 2.1. Scope ...................................................................................................................................................... 7 2.2. Application .............................................................................................................................................. 7
3. Reference documents ............................................................................................................................. 7
4. Terms and definitions ............................................................................................................................. 8
5. General requirements ............................................................................................................................. 8
6. Track information .................................................................................................................................... 9 6.1. Tracks and track names ....................................................................................................................... 10 6.2. Join lines ............................................................................................................................................... 10
7. Landmarks .............................................................................................................................................. 10
8. Overhead wiring structures .................................................................................................................. 11
9. Bay lengths ............................................................................................................................................ 13
10. Location of fixed signals ...................................................................................................................... 13
11. Overhead wiring information ................................................................................................................ 13 11.1. Wire run termination locations ........................................................................................................... 16 11.2. Fixed mid-point locations .................................................................................................................. 18 11.3. Support and registration arrangements ............................................................................................ 19 11.4. Overbridges and footbridges ............................................................................................................. 19 11.5. Conductors ........................................................................................................................................ 20 11.6. Switches ............................................................................................................................................ 23 11.7. Feeding arrangements ...................................................................................................................... 23 11.8. Surge arresters .................................................................................................................................. 23 11.9. Level crossing ................................................................................................................................... 23 11.10. Versine and mid-bay stagger ............................................................................................................ 24
12. Overhead wiring profiles ...................................................................................................................... 25
13. Auxiliary feeder schedule ..................................................................................................................... 25
14. Bonding schedules ............................................................................................................................... 25
15. Concessions and nonconformances .................................................................................................. 25
16. Use of colours ........................................................................................................................................ 25
17. Legends .................................................................................................................................................. 26
18. As-built layout drawings ....................................................................................................................... 26
19. Maintenance ........................................................................................................................................... 26
T HR EL 08014 ST Overhead Wiring Layouts
Version 1.0 Issue date: 26 June 2020
© State of NSW through Transport for NSW 2020 Page 7 of 26
1. Introduction Overhead wiring (OHW) is used to transmit power from traction substations to electric trains.
OHW generally consists of catenary and contact wires. The traction current to the trains is
carried by the catenary and contact wires, and auxiliary feeders when installed. The contact
wire provides a mechanically continuous path for train pantographs, and the catenary wire is
used to support the contact wire.
The overhead wiring (OHW) layouts are part of the drawing set required for documenting the
OHW design in accordance with T HR EL 08012 ST Overhead Wiring Standards for Design and
Construction. This standard should be read in conjunction with T HR EL 08012 ST.
2. Purpose The purpose of this standard is to set out the technical requirements for overhead wiring layout
drawings. The implementation of these requirements provides design Authorised Engineering
Organisations (AEOs) with a consistent approach in the content and drafting of overhead wiring
layout drawings.
2.1. Scope This document covers the technical requirements for the layout drawings of 1500 V dc OHW in
the TfNSW Metropolitan Heavy Rail Network.
Refer to TS TOC 1 Train Operating Conditions (TOC) Manual – General Instructions, which
defines the areas associated with the network.
2.2. Application The requirements in this document apply to overhead wiring layout drawings prepared for new
OHW installations, and for modifications and re-construction of existing OHW in the TfNSW
Metropolitan Heavy Rail Network.
3. Reference documents The following documents are cited in the text. For dated references, only the cited edition
applies. For undated references, the latest edition of the referenced document applies.
Transport for NSW standards
T HR CI 12040 ST Overhead Wiring Structures and Signal Gantries
T HR EL 08002 ST Relative Positions of Signals and Open Overlaps
T HR EL 08003 ST Level Crossings – OHW Requirements
T HR EL 08005 ST Labels for OHW Structures
T HR EL 08014 ST Overhead Wiring Layouts
Version 1.0 Issue date: 26 June 2020
© State of NSW through Transport for NSW 2020 Page 8 of 26
T HR EL 08012 ST Overhead Wiring Standards for Design and Construction
T MU AM 01007 TI Asset Reference Codes Register
T MU MD 00006 R2 Track CAD Resources
T MU MD 00006 R6 Electrical CAD Resources
T MU MD 00006 ST Engineering Drawings and CAD Requirements
T MU MD 00011 ST Concessions to ASA Requirements
TN 026: 2014 Engineering minimum safe approach distances – ground mounted
signal/overhead wiring interface
TS TOC 1 Train Operating Conditions (TOC) Manual – General Instructions
Transport for NSW drawings
EL 0030508 General – Railways Overhead Wiring – Type 6 Section Insulator – Support –
Arrangement – For Single Catenary
4. Terms and definitions The following terms and definitions apply in this document:
AEO Authorised Engineering Organisation
ASA Asset Standards Authority
EDMS engineering document management system
OHW overhead wiring
TfNSW Transport for New South Wales
5. General requirements Overhead wiring layout drawings shall comply with T MU MD 00006 ST Engineering Drawings
and CAD Requirements.
Overhead wiring layout drawings shall be drawn in A1 drawing sheets with a scale of 1:500.
Grid files shall be used in OHW layout drawings in accordance with T MU MD 00006 ST.
The tracks shall be drawn on overhead wiring layout drawings with Sydney on the left.
A standard north point arrow in accordance with T MU MD 00006 ST shall be shown. This is
normally located in the top left corner of the layout drawing.
Where an existing OHW layout drawing is updated in conjunction with an OHW modification, the
updated layout drawing shall comply with this standard as far as practicable, in accordance with
T HR EL 08012 ST.
T HR EL 08014 ST Overhead Wiring Layouts
Version 1.0 Issue date: 26 June 2020
© State of NSW through Transport for NSW 2020 Page 9 of 26
This document includes part copies of existing layout drawings as examples to illustrate the
application of specific requirements. However, apart from the mentioned specific requirements,
the example part layout drawings may not comply with other requirements of this standard due
to the evolution of OHW layout requirements over time.
6. Track information The following track information shall be shown on overhead wiring layouts as a minimum:
• tracks
• track geometry details including tangent point (TP), transition (TRS), compound tangent
point (CTP) and track radius
• track names
• join lines
See Table 1 for the symbols of these track information items. The corresponding standard cells
may be downloaded from T MU MD 00006 R2 Track CAD Resources.
See Figure 1 for an example part layout drawing showing the track information.
Table 1 – Track information on overhead wiring layouts
Track information Symbol Note
Track
Nil
Tangent point
Nil
Transition
Nil
Compound tangent point
Same as tangent point
Track radius R.--- Insert track radius in metres
Join line Nil
T HR EL 08014 ST Overhead Wiring Layouts
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Figure 1 – Example of a part layout drawing showing track information
6.1. Tracks and track names The names of the tracks relevant to the overhead wiring design shall be shown between the
rails or adjacent to one of the rails for each track, and at appropriate intervals along the track.
The track names shall be identical to those shown on the relevant 1500 V sectioning diagram.
Non-electrified tracks that are immediately adjacent to the electrified tracks shall be shown with
their track names on the OHW layouts. Other non-electrified tracks may be omitted for clarity,
but the presence of these tracks should be covered by a note on the drawing.
See Figure 1 for an example part layout drawing showing tracks and track names.
6.2. Join lines The OHW layout drawing number showing the adjoining OHW details shall be shown adjacent
to each join line. The engineering document management system (EDMS) number should be
used in referencing the adjoining layout drawing. The document numbers of the design AEO
may only be used if the conditions listed in T MU MD 00006 ST are satisfied. Refer to
T MU MD 00006 ST for further information on EDMS and requirements for document numbers.
Each end of the track shall be labelled with an arrow and the text 'To…(the next main railway
station)' adjacent to the join line.
7. Landmarks Landmarks that are near the electrified tracks and have an impact on the OHW design shall be
shown and labelled on the layout drawings. For example, special requirements apply to the
overhead wiring design at railway stations and level crossings. Refer to T HR EL 08012 ST and
T HR EL 08003 ST Level Crossings – OHW Requirements for more information.
T HR EL 08014 ST Overhead Wiring Layouts
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© State of NSW through Transport for NSW 2020 Page 11 of 26
The following landmarks shall be shown and labelled on the layout drawings as a minimum:
• railway stations
• overbridges, footbridges and underbridges
• airspace developments
• tunnels
• level crossings
• crossings of electric aerials above the overhead wiring
• traction substations and sectioning huts
• boundary fencing adjacent to OHW structures
Showing the outlines of the landmarks and relevant names on the OHW layouts is generally
adequate.
Landmarks shall be shown with dotted lines with a line weight of 0.25 mm. Street names
associated with bridges and level crossings shall be shown with a text height of 3.5 mm and a
solid line style with a line weight of 0.35 mm.
8. Overhead wiring structures Refer to T HR CI 12040 ST Overhead Wiring Structures and Signal Gantries for the standard
overhead wiring structures and guy footings. The symbols for the standard structures on OHW
layouts are given in Table 2. The corresponding standard cells may be downloaded from
T MU MD 00006 R6 Electrical CAD Resources.
Table 2 – OHW structures symbols on layouts
OHW structure Symbol Note
Single mast
Nil
Portal
Nil
Cantilever mast with single drop vertical
Drop vertical to be shown on the Sydney side of the cantilever mast
Single drop vertical Drop vertical to be shown on the Sydney side of the portal; See Figure 2 for an example of how a drop vertical is shown on a portal.
Twin drop vertical
See Figure 3 for examples of how twin drop verticals are shown on portals.
Anchor mast Nil
T HR EL 08014 ST Overhead Wiring Layouts
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© State of NSW through Transport for NSW 2020 Page 12 of 26
OHW structure Symbol Note
Anchor in tunnel
Nil
Guy footing
The guy footing type (G1, G2 or G3) shall be specified (see Note)
Note – The guy footing type designations 'G', 'M1', 'M2' and 'M4' have been used in
older versions of overhead wiring layout drawings.
Structure numbers shall be shown on the layout drawings and positioned to be:
• below or above all the tracks relevant to the OHW design
• perpendicular to the relevant tracks as far as practicable
• aligned with the structure symbol as far as practicable
The structure numbers shall be oriented with the Sydney side at the 'bottom' of the
alphanumeric character string.
Refer to T HR EL 08005 ST Labels for OHW Structures for the determination of OHW structure
numbers.
See Figure 2 for an example of a part layout drawing showing overhead wiring structures.
Figure 2 – Example of a part layout drawing showing overhead wiring structures
T HR EL 08014 ST Overhead Wiring Layouts
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© State of NSW through Transport for NSW 2020 Page 13 of 26
9. Bay lengths Refer to T HR EL 08005 ST for the determination of the distance between adjacent structures.
The bay length is the horizontal straight line distance between the support or registration points
of successive structures of the overhead wiring run.
The bay length is generally equal to the distance between adjacent structures when both
distances are expressed to the nearest metre. However, where the structures are common to
the OHW for two or more tracks, these distances may differ on curved tracks.
The bay length for each wire run shall be shown to the nearest metre on the layout drawing.
The bay length shall be shown as a number (without the unit of measurement) and shall be
located adjacent to the track and approximately midway between the structures.
Where the bay length is the same for multiple tracks, it is permissible to have it shown only once
on the layout.
Where the bay length is different from the subtraction of the structure numbers, a suffix 'ACT'
shall be added to the structure spacing. For example, '45 ACT' denotes that the bay length is
actually 45 m.
Where the length of the bay with an anchor structure is different from that for the corresponding
in-running wire run, a suffix 'A' shall be added to the bay length of the wire run going to the
anchor. The bay length of the anchor wire run shall be shown adjacent to the relevant
conductor. For example, '60A' denotes that the distance between the anchor structure and the
adjacent structure of the wire run is 60 m.
See Figure 2 and Figure 3 for examples of part layout drawings showing bay lengths.
10. Location of fixed signals The locations of fixed signals are given in signalling discipline documents, and should not be
shown on overhead wiring layouts. Noncompliances with T HR EL 08002 ST Relative Positions
of Signals and Open Overlaps and TN 026: 2014 Engineering minimum safe approach
distances – ground mounted signal/overhead wiring interface shall be shown with appropriate
notes stating the applicable concession numbers on the layout drawings in accordance with
Section 13.
11. Overhead wiring information The following overhead wiring items shall be shown if they are present in the part of the wire run
covered by the layout drawing:
• wire run anchor and wire run details
• fixed mid-point
T HR EL 08014 ST Overhead Wiring Layouts
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• support and registration arrangements
• in-running contact wire
• out-of-running contact or catenary wire
• auxiliary feeder
• pennant insulator
• termination insulator
• section insulator
• feeding jumper
• potential jumper
• switches
See Table 3 for the symbols of the overhead wiring items. The corresponding standard cells
may be downloaded from T MU MD 00006 R6.
Table 3 – Overhead wiring symbols on layouts
Overhead wiring items Symbol Note
'Moving' anchor (tension regulator)
See Note 1 The arrow points towards the relevant wire run
'Fixed' anchor
See Note 1 The arrow points towards the relevant wire run
Fixed mid-point
See Note 1
Support and registration from single mast Nil
Pull-off from single mast
Nil
Catenary suspension only (with no pull-off) in tunnel
Nil
Catenary suspension with pull-off from tunnel wall
Nil
Catenary suspension with pull-off from drop vertical in tunnel
Nil
T HR EL 08014 ST Overhead Wiring Layouts
Version 1.0 Issue date: 26 June 2020
© State of NSW through Transport for NSW 2020 Page 15 of 26
Overhead wiring items Symbol Note
Support and registration arrangement code
Nil
Cross-section
Nil
In-running (IR) contact wire
Nil
Out-of-running (OOR) contact or catenary wire
Nil
Auxiliary feeder
Nil
Pennant insulator Nil
Termination insulator Nil
Section insulator
Insert the section insulator type and arrangement. For example, 6A SI, 6B SI and 6D SI. Refer to EL 0030508 for Type 6 section insulator arrangements.
Feeding jumper
Insert label ‘FJ’
Potential jumper
Insert label ‘PJ’
Sectioning switch
See Note 1
Rail connecting switch
See Note 1
Combined isolating and rail connecting switch
See Note 1
Note 1 – The vertical lines may be inverted depending on the position of the symbol
relative to the track.
T HR EL 08014 ST Overhead Wiring Layouts
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© State of NSW through Transport for NSW 2020 Page 16 of 26
11.1. Wire run termination locations The following information shall be shown with the symbol for the anchor of a wire run
termination:
• the overhead wiring tension length shall be shown above the arrow denoting the direction
of the wire run from the anchor location
• the name of the track applicable to the wire run
• the name of the wire run; see Section 11.1.1 for details of wire run names
• reference anchor arrangement drawing
• anchor height of each overhead wiring conductor
The OHW tension length is the length of the OHW conductor from the fixed anchor to the
tension regulator. The fixed mid-point is considered a fixed anchor for this purpose. Refer to
T HR EL 08012 ST for further information.
The following information shall also be shown with the symbol for the anchor at the Sydney end
of the wire run:
• reference support and registration arrangement drawings
• the conductor label and design details
The conductor label and design details are described with the format "conductor label = section
area (in millimetres) / design tension (in kilonewtons) / standard conductor height at support
locations (in metres)". For example:
• 'Caty = 270 / 30.0 / 6.50' denotes that the catenary wire is a 270 mm2 conductor with a
design tension of 30.0 kN and a standard height of 6.50 m at support locations.
• 'Cont = 2x137 / 2x12.5 / 5.00' denotes that the system has two 137 mm2 contact wires with
a design tension of 12.5 kN each and a standard contact wire height of 5.00 m at support
locations.
• 'Aux = 270 / 13.2 @ 21 deg C' denotes the auxiliary feeder is a 270 mm2 conductor with a
design tension of 13.2 kN at a design temperature of 21 oC. The omission of the last part of
the description denotes that there is no standard conductor height for this auxiliary feeder
wire run.
Where multiple wire runs terminate at the same structure location, the information for each wire
run shall be shown.
See Figure 3 for an example of a part layout drawing showing wire run terminations.
T HR EL 08014 ST Overhead Wiring Layouts
Version 1.0 Issue date: 26 June 2020
© State of NSW through Transport for NSW 2020 Page 17 of 26
Figure 3 – Example of a part layout drawing showing overhead wiring terminations and overlaps
11.1.1. Wire run names The wire run name shall be an alphanumeric code with the following format:
LLDTKKKX, where
LL is the OHW structure label prefix applicable to the line, and is assigned by the Asset
Standards Authority. Refer to T MU AM 01007 TI Asset Reference Codes Register for the
prefixes that are currently used in the TfNSW Metropolitan Heavy Rail Network. LL may consist
of two or three characters. Where the line prefix consists of a single character, a dash is added
to the end of the prefix. For example, LL is “N-“ for the line prefix N.
D denotes the normal direction of travel over the relevant track – “D” for down, “U” for up, and “-“
for single line
T is a single letter for the track name – “M” for main, “S” for suburban, “L” for local, “R” for refuge
or relief, “X” for crossover, and “Z” for siding and other tracks
KKK consists of three numeric characters that correspond to the ‘electrical kilometrage’,
truncated to the nearest kilometre, of the first structure of the wire run. Refer to
T HR EL 08005 ST for the determination of ‘electrical kilometrage’. For example, if the first
structure of the wire run is SW2+987, KKK is 002.
X is a single letter used to distinguish different wire runs over the same track and with identical
KKK characters. “A” is used for the first wire run, “B” for the second, and so on.
T HR EL 08014 ST Overhead Wiring Layouts
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© State of NSW through Transport for NSW 2020 Page 18 of 26
For example, ‘SWDM060B’ is the name of the wire run for the Down Illawarra that starts at
structure SW60+367, and is the second wire run for the Down Illawarra that starts at that
‘electrical kilometrage’.
11.2. Fixed mid-point locations The following information shall be shown with the symbol for the fixed mid-point of a wire run:
• the overhead wiring tension lengths on each side of the fixed mid-point
• the name of the track applicable to the wire run
• the name of the wire run
• reference fixed mid-point arrangement drawing
Where there are more than one fixed mid-points at the structure location, the information for
each wire run shall be shown.
See Figure 4 for an example of a part layout drawing showing fixed mid-point arrangements.
Figure 4 – Example of a part layout drawing showing fixed mid-point arrangement
T HR EL 08014 ST Overhead Wiring Layouts
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© State of NSW through Transport for NSW 2020 Page 19 of 26
11.3. Support and registration arrangements The reference support and registration arrangement drawings shall be shown at the Sydney end
of the wire run in accordance with Section 11.1. Other relevant reference documents for the
support and registration arrangements, for example design manual, shall be listed on the layout
drawings in accordance with T MU MD 00006 ST.
The symbology for a support and registration arrangement consists of an ellipse. See Table 3
for an example.
The relevant track name shall be shown adjacent to the elliptical symbol.
Where the support and registration arrangements are defined by a coding system in accordance
with the referenced drawings and documents, the primary code shall be shown inside the ellipse
for each support and registration arrangement. The secondary codes and other details required
to fully describe the arrangement shall be shown adjacent to the ellipse, and on the opposite
side of the track name.
See Figure 3 and Figure 4 for examples of part layout drawings showing support and
registration arrangements.
11.3.1. Cross-sections Where the support and registration arrangement at a particular structure location is described
by a cross-section drawing rather than a code, the 'cross-section' symbol shall be shown at the
structure location. The reference cross-section drawing number shall be shown on the layout.
The reference cross-section drawing should be shown adjacent to the symbol. However, where
the OHW layout covers multiple locations that require cross-section drawings, the reference
cross-section drawing numbers may be listed with other reference documents on the layout
drawings in accordance with T MU MD 00006 ST. If the cross-section drawing does not cover
the support and registration arrangements for all the tracks at the location, the relevant track
names shall be shown adjacent to the cross-section symbol.
11.4. Overbridges and footbridges The arrangements for support and registration, safety screens, bonding and conductor profiles
at overbridges and footbridges are generally detailed in a set of drawings separate from the
layouts.
The overbridges and footbridges shall be labelled with a note stating the drawing numbers of
the relevant bridge arrangements.
The support and registration structure numbers and the bay lengths through the overbridge
shall be shown on the layout drawing.
T HR EL 08014 ST Overhead Wiring Layouts
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© State of NSW through Transport for NSW 2020 Page 20 of 26
Refer to T HR EL 08012 ST for the requirements of OHW profiles at overbridges and
footbridges, and the conditions under which they may be shown on the layout drawings.
See Figure 5 for an example of a part layout drawing showing an overbridge.
Figure 5 – Example of a part layout drawing showing an overbridge
11.5. Conductors The OHW conductors shall be shown in the following areas:
• overlaps
• crossovers and turnouts
• locations with pennant and termination insulators
• locations with section insulators
• locations with feeding and potential jumpers
• locations with more than one wire run above the track
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At other areas it is permissible to have the OHW conductors not shown on the layout drawings if
the design AEO has determined that there is sufficient and unambiguous information to allow
the OHW to be constructed and maintained in accordance with the design.
Where the maximum average conductor temperature for a tension length is designed to be
higher than 60 oC, then the maximum average conductor temperature for the tension length
shall be shown on the relevant OHW layout drawings in a conspicuous manner in accordance
with T HR EL 08012 ST. For example, a note may be provided immediately above the drawing
title block.
See Figure 6 for an example of a part layout drawing showing overhead wiring conductors.
Figure 6 – Example of a part layout drawing showing conductors
11.5.1. Overlaps The conductors for all wire runs at an overlap shall be shown. As a minimum, the conductors
shall be shown in the area between the termination structures of the two wire runs forming the
overlap.
The reference drawing number for the overlap arrangement shall be shown as a note adjacent
to the tracks in the overlap bay.
See Figure 3 for an example of a part layout drawing showing an overlap arrangement.
11.5.2. Crossovers and turnouts The conductors for all wire runs in a wire junction area shall be shown.
The conductors shall be shown for the entire wire run for a crossover, unless the crossover wire
run continues to form the in-running wire of a main line track. Then the conductors over the
main line track shall be shown for at least one bay beyond the wire junction.
At turnouts, the wire run that terminates after the wire junction shall be shown for at least one
bay before the wire junction and to the anchor.
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For a wire run that goes through the wire junction without terminating in the vicinity of the
junction, the conductors shall be shown for at least one bay on either side of the junction.
See Figure 6 for an example of a part layout drawing showing crossover and turnout
arrangements.
11.5.3. Pennant and termination insulators The pennant and termination insulators shall be shown. The associated OHW conductors shall
also be shown in the bay with these insulators.
See Figure 7 for an example of a part layout drawing showing pennant and termination
insulators.
Figure 7 – Example of a part layout drawing showing insulators and jumpers
11.5.4. Section insulators The section insulators shall be shown with a label that identifies the type, and the arrangement
of the section insulator where applicable. The associated OHW conductors shall also be shown
in the bay with the section insulator.
The drawing for the section insulator type shall be included in the list of reference drawings.
See Figure 7 for an example of a part layout drawing showing a section insulator.
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© State of NSW through Transport for NSW 2020 Page 23 of 26
11.5.5. Feeding and potential jumpers The feeding and potential jumpers shall be shown. The associated OHW conductors shall also
be shown in the bay with the jumpers.
Where two or more feeding jumpers are installed at an overlap bay or turnout in accordance
with T HR EL 08012 ST, a single ‘FJ’ symbol may be used to represent all the feeding jumpers
in parallel.
The label for feeding jumpers between the auxiliary feeder and the catenary wires shall be
modified to 'AFJ'.
See Figure 7 for an example of a part layout drawing showing feeding and potential jumpers.
11.6. Switches The switches shall be shown with the appropriate symbols in Table 3. The structure with the
switch mounting shall be identified on the layout, with a note stating the reference drawing
number of the switch arrangement.
The dot in the symbol for the combined isolating and rail connecting switch represents the
common connection point for the two functions of the switch.
The 'connection' of the sectioning switch symbol may be modified for a paralleling switch.
The OHW conductors shall be shown for the bays with the switch connection. The vertical lines
of the switch symbol shall be extended to the conductor connecting to the switch. The
connection between the switch and the conductor shall be shown as a dot.
11.7. Feeding arrangements The structure with the feeding arrangement shall be identified on the layout, with a note stating
the reference drawing number of the feeding arrangement.
11.8. Surge arresters Surge arresters in switching and feeding arrangements are not shown separately on the layout.
11.9. Level crossing Refer to T HR EL 08003 ST for the signage requirements at level crossings.
The minimum contact wire height at the level crossing shall be shown with a note at the level
crossing location.
Where warning frames are required in accordance with T HR EL 08003 ST, the locations of the
warning frames shall be shown on the layout.
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The location of the level crossing warning sign shall be shown on the layout. See Figure 8 for an
example of a part layout drawing showing the level crossing warning sign locations.
Figure 8 – Example of a part layout drawing showing level crossing warning sign locations
11.10. Versine and mid-bay stagger Where there is sufficient space on the layout drawing, the design versines and mid-bay
staggers for each wire run shall be tabulated and shown at each bay and adjacent to the tracks.
The track curvature and the direction of the staggers shall be shown in the table. See Figure 7
for an example of a part layout drawing showing versines and mid-bay staggers.
Where it is not practical to have the versine and mid-bay stagger tables shown due to space
constraint in the layout, the design versine and mid-bay staggers shall be tabulated in a
separate design document. The document number shall be included in the list of references
shown on the layout drawing.
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12. Overhead wiring profiles See Section 11.4 for the requirements for showing the OHW profiles at overline bridges and
footbridges on layouts.
Refer to T HR EL 08012 ST for the requirements for showing the OHW profiles at other
locations, for example in tunnels and airspaces, on layouts.
13. Auxiliary feeder schedule The support and registration arrangements for the auxiliary feeder shall be shown on the layout
in accordance with Section 11.3.
Where an auxiliary feeder is present and its support and registration arrangements are given in
an auxiliary feeder schedule drawing, the schedule drawing shall be included in the list of
references on the layout.
14. Bonding schedules Refer to T HR EL 08012 ST for the requirements for bonding schedules.
15. Concessions and nonconformances Where specified as a control by an approved Notice of Concession or Notice of Review of
Nonconformance issued in accordance with T MU MD 00011 ST Concessions to ASA
Requirements, a suitable note shall be added to the relevant layout drawings advising that the
concession or nonconformance is in force at the specified locations.
16. Use of colours Refer to T MU MD 00006 ST for the requirements and restrictions for using colours in drawings.
For OHW layout drawings, it may be useful to have colours to show the following:
• OHW wire runs when there are multiple wire runs that cross with other wire runs
• project works in brownfield sites, to distinguish between assets that are as follows:
o new
o to be modified
o to be retained without modification
o to be removed
• staged construction works
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17. Legends Where items that cannot be represented by the symbols described in this document are
required to be shown on the OHW layout drawings, the symbology for these items shall be
defined by the design AEO and tabulated in a legends table on the layout drawing.
Where colours are used to show project works in a brownfield site or staged construction works
in accordance with Section 16, the colour representation shall be defined in the legends table.
18. As-built layout drawings The as-built layout drawings shall reflect the final design configuration of the as-built OHW at
the completion of the project, and shall comply with T MU MD 00006 ST.
The surveyed locations of OHW structures shall be shown accurately on the as-built layouts.
The final design configuration of the as-built OHW may be different from the actual OHW
arrangement in the field. For example, the design stagger of the contact wire at a particular
location may be 250 mm, but the actual stagger in the field may be 265 mm. As the stagger is
within the allowable tolerance in accordance with T HR EL 08012 ST, the as-built position of the
OHW is acceptable, but 250 mm shall be shown as the design stagger at the location in the
as-built layout drawing.
Information in approved for construction (AFC) layout drawings that are provided for the
construction process shall be removed in the as-built drawings. For example, where colours are
used to show staged construction works, the as-built layout drawings should be in black and
white.
Redundant structures that have not been removed at the completion of the project shall be
shown and marked as redundant on the as-built layout drawings.
Where layout drawings are not part of the AFC design documents, the as-built layout drawings
shall be updated by the design AEO to reflect the final design configuration of the OHW at the
completion of the project. For example, if the AFC design consists of OHW adjustment
spreadsheets only, the as-built OHW layout drawings shall be updated by the design AEO at
the completion of the project.
19. Maintenance When the design configuration is altered by the activities of the operation and maintenance
AEO, for example the replacement of a support structure by a new one at a different location,
the as-built layout drawings shall be updated by the operation and maintenance AEO.