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Railway Earthing and Bonding

Principles and requirements for railway application

1 - 2 October 2019 | IET Savoy Place | London

Continuous Professional Development CPD (logo)



Day One: Tuesday 1 October 2019


Registration and networking


Chairman's welcome

David Atkey, Principal Design Engineer, Network Rail

Principles and requirements


Earthing design and management

  • Management plans/strategies
  • Control plan and codes of practice
  • Guidance notes
  • Deliverables for route section Earthing technical file

Roger White, Director, Railway Electrification Consultancy
Stephanie Ambala
, Atkins Member, SNC Lavalin Group 


Legislation and standards – changes and updates

  • Electricity at work act
  • British, European and International
  • GLRT 1210
  • NR Codes of practice ( PAN etc.)

Richard Stainton, Professional Head – Electric Power, Network Rail


Refreshment break


Requirements for Earthing and Bonding

  • Functional Earth
  • Protective Earth (electrical protection)
  • Protection against direct contact (humans)
  • Protection against indirect contact (equipotential bonding)
  • Return current bonding
  • Lightning protection (human protection)

Dominic Kelsey, Technical Director – Transportation, Atkins


Requirements for EMC

  • Principles of Earthing for system reliability
  • Principles of Earthing for lightning protection (system reliability)

Ken Webb, Technical Director – Electromagnetic Compatibility (EMC), Mott MacDonald


Review session


Lunch and networking


Principles of traction Earthing design

  • Standards requirements
    • Relevant standards
  • Types of electrification schemes
  • Earthing design for 25kV AC railways
    • Railway Potentials: touch; effective touch;
    • Line of route bonding; rails, bridges, signals, stations
    • Return current: Buried earth wires; Ariel Earth wires; Return conductor; Return screening conductor

David Atkey, Principal Design Engineer, Network Rail

AC design principles


Isolation/Earthing OLE Distribution System

  • OLE Distribution Configuration ( Classic and AT)
  • Isolation Diagrams: CME, DEP, point of isolation
  • Isolation/earthing following a fault: Contact system and ATF
  • Isolation/earthing for maintenance: Contact and ATF
  • Isolation/earthing for maintenance of Feeder and AT sites
  • Bonding of the OLE- 400m

Louis Nel, Principle Consultant, Navitas Engineering


Electricity supply Earthing design principles

  • TNO and DNO connections at 33kV 66kV 132kV and 400kV
  • Substation rise of Earth potential
  • Ground modelling and testing

Dave Hewings, Special Projects Manager (Electrification), Network Rail


Refreshment break


Non-traction LV supplies (DNO)

  • Key standards
  • Types of 3ph and 1ph supply
  • Impact of traction electrification systems
  • Earthing of non-traction supplies (lineside)
  • Earthing of stations and DNO supplies
  • Good design practice for system reliability, safety and EMC

Mike Scargill, Professional Head of Mechanical & Electrical Systems, Transportation, Atkins


Review session




Day Two: Wednesday 2 October 2019


Registration and networking


Chairman's welcome

Roger White, Director, Railway Electrification Consultancy

Civil interfaces, installation and testing


Signalling and communication Earthing design principles

  • Principles of bonding to the electrification systems
    • Common bonding
    • Segregated Earthing
  • Signalling distribution and protection
  • Protective Earthing (e.g. 25kV)
  • Good design practice for system reliability, safety and EMC
  • Lightning protection

Graeme Christmas, Principle Engineer – Signalling Design, Network Rail


AC and DC railway interface design principles

  • AC DC overrunning
    • Earthing requirements
    • Interface requirements
  • AC DC parallel running
    • Earthing requirements
    • Interface requirements

Alan Hodge, Senior Project Engineer (E&P), Network Rail


Registration break


Overline and underline bridge bonding

  • Fitted and non-fitted bridges
  • Conducting bridge
    • Clearances and bonding
  • Non-conducting bridge
    • Bridge designs
    • Clearances and bonding
    • Flashover strip
  • Pipe bridges

Garry Keenor, Group Engineer – Electrification, Atkins
Dela Sharifi
, Engineer, Atkins


Station Bonding

  • Civil Designer
    • Canopies Grade 11 listed Wooden Canopies, Steel, non-conducting, new construction
    • Bonding Bridges on Platforms
    • Standing surface
    • Exceptions for small conductive parts
  • LV Station Designer
    • Inter-bonding between platforms
    • Lengths and size of bonds
    • Bonding LV systems on Platforms (Lamp Posts, Vending machines, CCTV, VIDs, signalling equipment rooms LOCsetc)
    • Bonding Signal Heads: In Canopies; On Platforms; End of Platforms

Denis Cross, Technical Director, WSP


Review session


Lunch and networking


Case study: Systems testing

  • Composite bonding plans
  • Signalling immunisation, induced voltage
  • Protective provision
  • Rail potentials, touch potentials
  • Immunisation

Chris Wilson, Engineering Project Manager, Network Rail


Case study: An example of integrated approach to AC electrification E&B design

  • Traction voltage levels on running rails
  • Reducing rail voltages to compliant levels
  • Impacts on interconnecting conductive parts
  • Optimum solutions for traction system design
    • Lineside structures 
    • LV Lineside systems

David Atkey, Principal Design Engineer, Network Rail


Refreshment break


Case study: Crossrail E&B Systems, Delivery and Challenges

  • E&B Development and Life Cycle
  • Earthing and Bonding
    • Station, Shafts and Portals (SSP)
    • Tunnels,
    • Platforms,
    • PSD
  • Earth Network testing
  • Civil Interfaces
  • Challenges and lessons learned

Malcolm Anderson, Professional Head - Traction Power, Mott MacDonald
Jonathan King, Systems Integration Group - RAMS, Crossrail
Isis Carvalho, Chief Engineer Group – Electrical, Crossrail


Review session



Programme subject to change



Member - from £529

Non-member - from £629

Student - from £279