HV Power Day Tester

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Date: 11 Sept 2026

Location: Tufnell Park Depot, London Underground Ltd

Company: TfL, GLA or OPDC

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Key Information

 

Job title – Power Delivery Substation Tester

Grade – P3A1
Salary- £67,370.00- £70,428.00
Location – Tufnell Park, N19 (prepared to travel all over the London Underground

system and its supply distribution network)

Contract Type – -Permanent- London Underground

Shift Pattern: 2 weeks of days and 1 week of nights on rotation. There is an option once qualified to move to shift work with a salary uplift to reflect.

 

Overview of project/role

 

London Underground would like to offer you the opportunity to join our inclusive and diverse workforce; proudly reflecting the city that we serve.

 

London Underground has the largest private electrical distribution network in the country requiring multi-disciplined technical staff to maintain the infrastructure. We have an opportunity in the field of Power Distribution for a Substation Tester.

 

You will be responsible for undertaking, servicing and first-line fault attendance and repair of all plant and equipment under the control of Power Delivery.

 

You will ensure that the assets are serviced in accordance with set specifications to meet safety and operational criteria in order to provide an efficient and continuous power supply to the London Underground railway system.

 

Key Accountabilities

 

  • Fault finding and first line fault repair of HV (22kV and 11kV) Switchgear, DC Traction Switchgear, Transformers and Rectifiers, LV Switchgear, Signal Contactors, Frequency Changers and Rotary Convertors, Battery Chargers and Battery Systems and Compressed Air Equipment.
  • Isolation and Earthing of Substation Plant and the issue and cancellation of associated Safety Documentation, including overall responsibility for application of Safe Systems of Work.
  • Servicing (clean, inspect, calibration checks in accordance with Work Instruction(s) and associated check sheets & report) of DC switchgear and frequency changers.
  • Maintenance, fault finding and repair of substation/station batteries and associated charging equipment. Assembly of battery systems and connection of hospital sets.
  • Undertake work on live AC and DC apparatus, conductors or equipment up to 1kV whilst conforming to Power Delivery Live Work Procedures.
  • Assist Fitting Teams while on standby duties.
  • Use meters and instruments (e.g. Multi-Meters, Insulation Resistance (Megger) Test Sets, HV Switchgear Profiler, DC Traction Meters, Battery Impedance Test Equipment, UltraTEV Devices, IR Detectors and Humidity Meters) decipher results and record readings.
  • Drive vehicles, clean them and carry out vehicle checks as required
  • Operate communication / data transmission and display equipment.
  • Operate mechanical aids and use portable equipment.
  • Take substations/switch houses etc onto local/manual control.
  • Undertake regular inspections of plant and site conditions; monitor and log plant instrumentation and record and report any defects/abnormalities.
  • Ensure that the work of staff acting under your control is carried out in accordance with Safety instructions.
  • Undertaking Point of Work Risk Assessments and implementing suitable control measures to maintain site safety.
  • Act as Site Person in Charge as required.
  • Prepare defect reports.

 

Skills, Knowledge & Experience 

 

Skills  

 

  • Ability to interpret, understand and apply technical drawings (Essential)
  • Hold a valid Full UK driving Licence (Essential)

 

 Knowledge 

 

  • Electrical Engineering Qualification (City and Guilds/ONC) or equivalent (Essential)
  • Proficient in the use of electrical test equipment used to determine the condition of plant and equipment (Essential)
  • Demonstrate theoretical electrical knowledge of batteries, chargers and supplies, standby power supplies and three phase AC electrical supplies, transformer principles, AC & DC switchgear operation, the fundamentals of circuit protection and earthing arrangements. (Desirable)

 

 Experience 

 

  • Recognised electrical apprenticeship (Essential)
  • Relevant electrical power experience (Fitting skills) (Essential)
  • Experience working with electrical test equipment to determine the condition of plant or equipment. (Essential)
  • Experience isolating and earthing HV plant (Senior Authorised Person or Authorised Person or equivalent) (Desirable)
  • Experience working to HV/LV rules in a Power Distribution system (Desirable)
  • Experience of electro-mechanical systems

 

Application Process  

 

  • Please apply using your CV only
  • Think carefully about the skills, knowledge and experience in the advert and cover this in your CV
  • PDF format preferred and do not include any photographs or images 

 

Vetting Process 

At Transport for London, safety, trust and fairness sit at the heart of how we recruit. Our Vetting Charter (https://tfl.gov.uk/corporate/careers/our-vetting-process) explains the checks we carry out before you join us, helping ensure we create a safe, inclusive and reliable network for everyone who depends on our services. We simply ask that the information you provide is honest and accurate so we can progress your application smoothly. If something doesn’t match or can’t be verified, we may not be able to move forward with your application, but we’ll always treat you with transparency, respect, and clear communication throughout. 

 

All offers of employment are subject to satisfactory right‑to‑work checks.  Candidates must be able to demonstrate their right to work in the UK.  At the present time TfL is unable to offer visa sponsorship for this role.

 

Equality, diversity and inclusion 

 

We are committed to equality, diversity and inclusion and aim to reflect the diverse communities we serve. We believe that a diverse workforce enables us to deliver better services and outcomes. Our goal is to make our recruitment as inclusive as possible. As a Disability Confident Leader, we actively encourage applications from disabled people. As part of the Disability Confident scheme, we aim to offer an assessment or interview to candidates who apply via the scheme where the minimum essential criteria for skills, knowledge and experience has been met. In some circumstances, it may not be practical to offer an interview or assessment to every candidate who applies through the scheme and meet the minimum essential criteria; in these situations, we select candidates who best meet the minimum criteria for the job rather than interviewing all who meet them. 

Across all recruitment activity, we recognise that selection methods may vary depending on the nature and scale of the campaign and will be applied fairly, consistently and proportionately in line with our Disability Confident commitments.   

 

We also use anonymising software that removes identifying information from CVs and cover letters to make the process fair.


Benefits  
In return for your commitment and expertise, you will enjoy excellent benefits and scope to grow.  Rewards vary according to the level of role but mostly include the below:
 
Final salary pension scheme 
Free travel for you on the TfL network 
Reimbursement of 75% of the cost of a standard class Ticket for National Rail travel from home or 75% reimbursement on a 28-day flexi ticket
30 days annual leave plus public and bank holidays 
TfL is committed to work-life balance, operating a hybrid working approach where business and role requirements allow
Private healthcare discounted scheme (optional) 
Tax-efficient cycle-to-work programme
Retail, health, leisure and travel offers 
Discounted Eurostar travel
 
Hybrid working within this role enables a balance of 50 per cent of time split between the office and home over a 4 week period. Hybrid working arrangements can evolve subject to business requirements. 

We will make every effort to give you as much notice as possible, however some interviews/assessments could be organised at short notice.