Senior Electrical Commissioning Engineer in London

Mace combines construction expertise with consultancy to unlock potential in every person or project and redefine the boundaries of ambition.

You’ll Be Responsible For:

• Planning and coordinating electrical commissioning activities by developing commissioning test plans, reviewing schedules, confirming resource and equipment availability, and ensuring the latest revisions of commissioning instructions are in use.
• Executing and overseeing the commissioning of LV, HV, and EHV electrical systems including switchboards, transformers, batteries, UPS, protection relays, interlocks, and EHV grid interface equipment up to 400kV.
• Applying and enforcing nuclear, electrical, and industrial safety requirements, including pre‑job briefs, point‑of‑work risk assessments, and surveillance of safety rule compliance.
• Implementing configuration control by reviewing and validating red‑line mark‑ups, managing temporary modifications, and ensuring commissioning data is accurately captured in IT systems (e.g., EAM, Switch, CMS).
• Analysing and verifying electrical commissioning results, assessing compliance with acceptance criteria, identifying deviations, and engaging designers or vendors for technical resolution.
• Managing governance activities including control of commissioning hold points, ensuring tests meet nuclear safety justification requirements, and providing traceable LC 6 evidence packages.
• Coordinating multidisciplinary interfaces by supporting mechanical, I&C, and process commissioning teams on systems containing electrical interactions or safety dependencies.
• Managing system walk‑downs and acceptance by verifying system completeness, reviewing handover documentation, closing punch‑list items, and confirming readiness for testing or energisation.
• Capturing, recording, and communicating operational experience to support continuous improvement across commissioning activities.
• Mentoring and guiding junior engineers and technicians, promoting nuclear professionalism and developing commissioning capability within the programme.

You’ll Need To Have:

• Degree in a relevant engineering discipline or equivalent 3 years’ experience.
• Degree in Electrical Engineering or equivalent technical discipline.
• Strong technical knowledge of HV/EHV/LV electrical distribution systems, grid interface equipment, protection, UPS, DC systems, and control systems.
• Significant experience in commissioning within highly regulated sectors (nuclear, power generation, transmission, or oil and gas).
• Demonstrated competence in protection relay testing, logic and interlock verification, and safe HV/EHV energisation planning.
• Understanding of nuclear safety culture, regulatory expectations, and configuration management.
• Ability to interpret complex electrical drawings (SLDs, wiring diagrams, logic diagrams).
• Experience working under electrical safety rules, PTW, LOTO, and statutory regulations (HASAWA 1974, Electricity at Work Regulations 1989).
• Strong communication, analytical, and problem‑solving skills.

Our Values:

• Safety first – Going home safe and well. We champion a safe, diverse and inclusive working environment, understanding the importance of wellbeing in every team.
• Client focus – Deliver on our promise. We own the quality of deliverables, strategic outcomes and build long term relationships with our clients.
• Integrity – Always do the right thing. We influence positive outcomes within our industry, while always aligning with our compliance obligations.
• Create opportunity – For our people to excel. We champion a continuous improvement culture throughout all activities, inspiring our people and teams to develop.

Mace is an inclusive employer and welcomes interest from a diverse range of candidates. Even if you feel you do not fulfil all the criteria, please apply as you may still be the best candidate for this role or another role within our organisation. We are also open to discussing part time, flexible, and hybrid working options if suitable within the role.