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Delivering training services for the Built Environment and Utility sectors since 2004, we operate from our purpose-built training facilities and regional offices located in Southeast London, the East Midlands and West Yorkshire, with the use of over 100 training centres nationwide.

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Low Voltage Jointing (DNO)


Low voltage electricals are vital for day to day activities, powering our appliances, Telecomms, and even our electric cars. With such a broad user base for low-voltage cables, there are nuances and techniques that engineers and operators must know to fit and maintain them safely and most efficiently. In this case, the training will focus on low-voltage electrical works managed by a Distribution Network Operator or DNO.

This Citrus Low Voltage Jointing (DNO) qualification takes delegates through the techniques, procedures and regulatory requirements of Jointing with low voltage cables.

Course Outline

Through a mix of practical and theory-based exercises and tutorials, this Citrus Low-Voltage Jointing (DNO) qualification gives delegates the understanding, skill, knowledge, and competence to carry out Jointing work on live cable networks.

The course reflects national standards and industry best practices and is fully accredited in line with regulations. In addition, choose to learn with Citrus, and delegates will benefit from our custom-built training facilities and customer-first approach.

Our occupationally and technically-experienced trainers coach delegates on this course in the Jointing School, completing the session with a practical observation and short answer question paper. They must pass the assessment to qualify for the Citrus certificate of attendance, valid for three years.    

Once delegates have the certificate of attendance, this then allows them to work under personal supervision unitl they complete their trade test or authorisation assessment.

Course Programme

Delegates taking this Low Voltage Jointing (DNO) qualification will cover knowledge, skills and operating practice.

Course content includes:

  • Jointing practices and procedures 
  • Health and Safety regulations and legislation relating to electrical work  
  • Control of Substances Hazardous to Health (COSHH)  
  • Appropriate PPE for low-voltage Jointing  
  • Insulation and continuity testing  
  • Earth Loop Impedance  
  • Polarity testing 
  • Three phase testing phase rotator 
  • Task instructions     
  • How to carry out risk assessments
  • Assessment
On Completion

Upon successfully completing this qualification, delegates will be able to:

  • Complete low voltage joints live at our training school in Brentwood     
  • Understand low voltage Jointing practices and procedures 
  • Successfully complete a Trade Test with a DNO or IDNO 
  • Identifying low voltage cables before they’re opened
Who Should Attend?

This Citrus Low-Voltage Jointing qualification is for anyone needing training and assessment in working with low-voltage cables in their line of work.

Course Duration

Delegates take this comprehensive training over 10 - 20 days, depending on experience. If delegates are complete novices, they must take the full 20-day training. Reductions will only factor for those with qualifications in:

  • First Aid 
  • Manual Handling  
  • New Roads and Street Works Units 1-3 card  
  • A knowledge of working in the electrical industry, i.e. LV Jointers, Domestic Electrician, Jointers Linemans or Fitters Mate. 

If a delegate already has the above certificates, low voltage training will be completed in 10 days.

Why Citrus?

We dedicate our efforts to unrivalled quality and the customer experience at Citrus Training. As a result, we are the leading UK-based provider of health, safety and technical training and assessment services to the Built Environment and Utility sectors. 

Citrus Training serves 85 of the top 100 building services companies in the market. With over 20 years of collective experience, we offer advice and guidance for new and experienced entrants looking to work within the IDNO/DNO industry. 

Our Electrical training is accredited, regulated, and of an exceptionally high standard. Delivered by our Electrical Safety trainers and DNO Trained Assessors, they also carry out competency pre-assessment and testing to work on IDNOs and DNOs. 

Finally, we teach and promote current industry and legislative requirements to ensure delegates take them forward into their daily working lives, delivering courses at our nationwide, industry-leading and accredited training centres to offer the very best of training standards and quality assurance. 

Things You Need to Know

Course duration is dependent on experience. If delegates have any of the following, the course will take less time:

  • First Aid 
  • Manual Handling 
  • New Roads and Street Works Units 1-3 card.  
  • A knowledge of working in the electrical industry, i.e. LV Jointers, Domestic Electrician, Jointers Linemans or Fitters Mate. 

If the candidate does not have any of these, they will need to take the 20-day course, where this will all be covered in the first week of the course, plus 1:500 drawings and insight into Low Voltage Jointing. 

Delegates must be 18 or over. Before starting the course, they must inform their trainer of any special considerations, medication or physical restrictions that may cause difficulties in any part of the training.

National Coverage

Over 100+ training centres nationwide, with 150+ technical trainers, delivering upwards of 250+ courses to over 40,000+ delegates each year. Thats why we're the UK's trusted training provider.

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