Overhead Wiring Layouts - Transport for NSW

© 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

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© 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




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




This standard is a first issue.




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




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 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.




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




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.




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




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




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




• 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




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.




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.




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.




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




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.




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




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.




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.




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.




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.




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




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.

Date post:	01-Nov-2021
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Overhead Wiring Layouts - Transport for NSW

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