Neutral current diversion
In simple terms a neutral current diversion can occur when the combined protective earthing and neutral conductor in an electrical system fails. The current in that system may itself then be diverted by making a haphazard circuit via exposed metal workings in the surrounding, in buildings this might also including gas, water and oil pipes which can be highly dangerous.
In technical terms the Electrical Contractors Association describe neutral current diversion as "the event of a lost protective earthed neutral (PEN) conductor on a TN-C-S (PME) electrical supply, the installation loses its intended connection to neutral and Earth. Current is then ‘diverted’ and will find its way back to the supply transformer any way it can. One common route is through shared metallic pipework, such as gas and water pipes."
Definition from "ECA Members: Help us research neutral current diversion" The IET, Electrical Contractors Association (ECA), Electrical Safety First (ESF), NAPIT, NICEIC and SELECT are working together to investigate the prevalence of Neutral Current Diversion (NCD) incidents across the UK.
[edit] Related articles on Designing Buildings
- Articles about electricity.
- BSRIA articles.
- BSRIA definitions.
- Building management system.
- Building services.
- ECA articles.
- Electric.
- Electrical appliance.
- Electrical consumption.
- Electrical energy.
- Electrical equipment.
- Electrical installation.
- Electrical power.
- Electrical safety.
- Electrician.
- Electricity.
- Electricity bill.
- Glossary of electrical terms.
- Low-voltage switchgear and protective devices.
- Mains electricity.
- Safe isolation for low voltage.
- Transducers and transformers.
Featured articles and news
Homes England creates largest housing-led site in the North
Successful, 34 hectare land acquisition with the residential allocation now completed.
Scottish apprenticeship training proposals
General support although better accountability and transparency is sought.
The history of building regulations
A story of belated action in response to crisis.
Moisture, fire safety and emerging trends in living walls
How wet is your wall?
Current policy explained and newly published consultation by the UK and Welsh Governments.
British architecture 1919–39. Book review.
Conservation of listed prefabs in Moseley.
Energy industry calls for urgent reform.
Heritage staff wellbeing at work survey.
A five minute introduction.
50th Golden anniversary ECA Edmundson apprentice award
Showcasing the very best electrotechnical and engineering services for half a century.
Welsh government consults on HRBs and reg changes
Seeking feedback on a new regulatory regime and a broad range of issues.
CIOB Client Guide (2nd edition) March 2025
Free download covering statutory dutyholder roles under the Building Safety Act and much more.
Minister quizzed, as responsibility transfers to MHCLG and BSR publishes new building control guidance.
UK environmental regulations reform 2025
Amid wider new approaches to ensure regulators and regulation support growth.
BSRIA Statutory Compliance Inspection Checklist
BG80/2025 now significantly updated to include requirements related to important changes in legislation.