Job Description

Location: Wymondley 400kV Substation, Hertfordshire

Rate: £500 per day (subject to review when stepping into SR163 Site Manager role)

Contract Type: Full-time, site-based, contract

Duration: 6-month (part of an 18-month programme - high probability of extension)

Hours: Monday to Friday, 10-hour days with occasional weekends

IR35 Status: Outside IR35

MRR Infrastructure is supporting the delivery of a major 400kV substation build as part of the UK’s National Grid transmission infrastructure. This global engineering-led consultancy is a key delivery partner across multiple National Grid frameworks, known for its safety-first approach and commitment to technical quality.

We are seeking an experienced M&E Manager to lead the mechanical and electrical workstreams on site. This position will initially support the Site Manager in day-to-day delivery and supervision, with the expectation to step into the SR163 Site Manager role as the project progresses.

This is a critical, high-visibility role requiring hands-on coordination of subcontractors, proactive oversight of compliance and programme progress, and a focus on delivering to National Grid’s standards of safety, quality and reporting.

Essential Qualifications & Experience:

*

Extensive experience on National Grid transmission projects

*

National Grid Competent Person (NSI 6 & 8)

*

SSSTS, SMSTS or IOSH Managing Safely

*

CSCS Supervisor and First Aid trained

*

CITB Temporary Works Supervisor or Coordinator

*

HSG47 and Impressed Voltage awareness

*

Strong background in electrical supervision within the T&D sector

*

Previous SR163 or TP137 appointment

Desirable:

HNC/HND in Electrical Engineering, formal electrical training, IOSH Environmental or equivalent