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Mercury

Authorised Person

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Mercury

Builds and manages complex engineering and construction projects for leading global corporations.

Oversee electrical safety, LOTO, commissioning & permits for LV/MV systems on projects.
1 months ago ago
Expert & Leadership (13+ years), Intermediate (4-7 years), Experienced (8-12 years)
Full Time
London, England, United Kingdom
Onsite
Company Size
2,919 Employees
Service Specialisms
Construction services
Project Management
Consulting
Engineering
Design
Technical Services
Turnkey
Sector Specialisms
Life Sciences
Data Centres
Technology
Mechanical Services
Pharmaceutical
Oil & Gas
Utilities
Manufacturing
Role

Description

energisation
switching
commissioning
testing
reporting
permit management
  • Ensure that the correct tags are applied to all equipment awaiting energisation
  • Operational control of safe switching (Energisation/Isolations) during the commissioning phase.
  • Ensure that communications to the SAP and CxA are timely, clear and precise in relation to switching operations.
  • Review and approve Sub-Contractor Electrical RAMS
  • Review of commissioning process’
  • Perform safe energisations, isolations and functional switching
  • Enforcement of the Electrical Permit to Work system, Approve/ cancel/ close electrical safety related permits relating to the voltage range you are nominated for. (Low Voltage/ Medium voltage)
  • Assistance within the Commissioning process from Level 1 through to Level 5.
  • Assist in electrical incident investigations
  • Inspect, commission, troubleshoot, associated control systems and power circuits and switchgear
  • Authorise Energisation and Isolation Requests once all criteria have been met for the nominated voltage range
  • Issue internal weekly progress report, to the SAP, highlighting all changes in electrical conditions on site.
  • Take live readings (Phase rotation, voltage level, etc.) post energisation and record on energisation request form. Ensure all post-connection/ live test results are compliant in the jurisdiction.
  • Ensure the segregation of hazardous areas and the correct use of Electrical PPE
  • Be or become conversant with latest local jurisdictional electrical regulations.
  • Ensure any concerns and updates are offered to the Person in Charge of an Electrical Installation and Senior Engineer
  • Ensure that all works are conducted in accordance with the client directives.
  • Reporting of any electrical incidents to SAP and Energy Marshall
  • Perform panel inspections and complete ‘Pre Energisation Checklists’ prior to energisations.
  • Identify potential hazards and implement mitigation measures.
  • Report any electrical events to SAP
  • Monitor the condition of PPE and safety equipment, advice Senior Authorised Person of calibration requirements or replacement safety equipment as required.
  • Execution of switching schedules/notes post approval from the SAP and Energy Marshall
  • Follow the instruction of the Senior Authorised Person.
  • Perform and demonstrate Live Dead Live testing as required.
  • Review and understanding of Sub-Contractor COHE (Control of Hazardous Energies)
  • Assist Senior Authorised Persons to remain compliant in the completion of the necessary internal audits such as Self-Assessment COHE Audit and Audit for the inspection of temporary electrics.
  • Establish and maintain positive and effective working relationships with site supervisors, peer workers and vendors.
  • Perform testing, Insulation Resistance, Point to Point, grounding etc. providing a sound knowledge of the testing equipment to be utilised. Ensure all pre-connection/ dead test results are compliant in the jurisdiction.
  • Perform a variety of commissioning duties including, but not limited to, MCC's, VSD's, distribution panels, motors, lighting and small power circuits.
  • Ensure that all warning signs are in place and checked at regular intervals
  • Site management of the Mercury “In Progress” snagging system ensuring that the supervisors conduct the works is a safe and controlled manner.
  • Ensure areas are secured which are under permit control.

Requirements

craft cert
level 6
mv experience
arc flash
loto
switching course
  • Understand the need for and adherence to the Permit to Work and Lock-Out Tag-Out Procedures and follow safe working practices.
  • Where the jurisdiction requires, complete a recognised course in Verification, Testing and Certification.
  • If not done so during proof of qualification, provide evidence of successful completion of colour vision test.
  • Be a qualified electrician awarded the National Craft Certificate as part of the national Framework of Qualifications or equivalent in the jurisdiction and verified by Naric.
  • Have successfully obtained a suitable electrical award, equivalent to Level 6 or higher on the National Framework of Qualifications.
  • Understanding of EN and local code Regulations.
  • Be conversant with Arc flash mitigation including PPE selection, condition and maintenance.
  • Demonstrate a full understanding of all applicable policies and work methods associated with assigned duties to commission electrical equipment and to perform other duties as required.
  • Understand, interpret and work from various forms of project documentation such as Punchlist Procedure, As Built Procedure, Vendor Manuals etc.
  • Successfully complete any training deemed necessary by Mercury in the jurisdiction.
  • Experience managing work and safety precautions across control boundaries.
  • Understanding of the Mercury site specific ESSOW (Electrical Safe System of Work).
  • Must have worked on MV systems for a minimum of three years
  • Become familiar with, comply with and enforce through permitting and auditing, the relevant Mercury SOP’s including but not limited to Control of Hazardous Energies Procedure and Operating and Energisation Procedures for Work on LV & MV Systems.
  • Experience performing / supervising advance cable works including phasing, testing, identifying & spiking (Spiking is a specialist skill requiring a licence in many jurisdictions, it may not be required as essential but experience of, and being conversant with the process is essential)
  • Understand, interpret and work from various forms of project drawings such as SLD's, Wiring Diagrams, schematics etc.
  • Demonstrated history of delivering HV/MV Infrastructure projects, DC / DNO / IDNO / Power Generation (If being appointed as an Authorised Person for MV, be familiar with LV infrastructure and equipment if being nominated as an Authorised Person for LV)
  • Have completed a recognised MV/HV switching course if being appointed as an MV Authorised Person

Benefits

Information not given or found

Training + Development

Information not given or found
Company

Overview

Founded 1972
Year Established
The company was established in 1972 by Frank O’Kane and Joe Morgan in Dublin.
€500M Revenue
Annual Turnover
The company generates over €500 million in annual revenue through large-scale, high-tech projects.
€25M Milestone
Recent Project Achievement
Recently completed a significant €25 million hyperscale data center facility.
25+ Countries
Global Reach
The company has successfully completed projects in over 25 countries worldwide.
  • Delivers complex engineering and construction projects—often turnkey mechanical, electrical, and commissioning works—across Europe and beyond.
  • Their specialisms span mechanical and electrical engineering, sprinkler and fire-protection systems, data-center infrastructure, and commissioning services.
  • The company’s history is marked by early adoption of BIM, prefabricated modular construction, and digital commissioning platforms—underscoring its tech-driven edge.

Culture + Values

  • WORK SAFE | HOME SAFE
  • BRAVE
  • DYNAMIC
  • MAKE IT HAPPEN

Environment + Sustainability

Top 25% Ranked
Sustainability Ranking
The company is recognized for its responsible business practices, ranking in the top 25% of companies globally as rated by EcoVadis.
50%+ Certified
Green Building Projects
Over half of the company's projects are pursuing LEED and BREEAM certifications, highlighting its commitment to sustainable construction practices.
33k kg CO₂ Neutralized
Carbon Offset Initiative
The company has neutralized 33,000 kilograms of carbon dioxide through its tree-planting program, contributing to global reforestation efforts.
100% Green Electricity
Energy Supply
All Irish offices and facilities operate on entirely green electricity, reducing the company's reliance on fossil fuels.
  • Achieved zero waste to landfill on projects across Ireland, UK, Italy, France, Netherlands, Poland and Belgium
  • Implemented Smart Waste tracking system to measure CO₂ emissions and waste data in real time
  • Disclosed environmental impact through CDP since 2020

Inclusion & Diversity

40+ nationalities
Global workforce diversity
The company's global workforce is comprised of employees from over 40 different nationalities.
2024 Gender Pay Gap Reports
Transparency in pay equity
The company has published Gender Pay Gap Reports in Ireland and France for 2024 to promote pay equity.
10 years
Career development support
Group mentoring programmes are available for staff in their first 10 years of their careers.
  • Executive-driven Diversity & Inclusion Policy embedded across employee lifecycle
  • Hosts talks, events and courses to support women in construction and improve gender equality
  • Group mentoring programmes for women and foreign nationals
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Authorised Person at Mercury in London, England, United Kingdom