Assystem is an international company with one mission: accelerate the energy transition around the world.

Every day, our 6,500 switchers located in 12 countries (Europe, Middle East, Pacific Asia & Africa) connect their six thousand billion neurons to tackle the task of the century: switching to low-carbon energy.

We are a collective committed to the actors who are making the energy switch. Sharing our knowledge, expertise and values allows us to innovate and think differently about the energy transition.

Drawing on more than 55 years' experience in highly regulated sectors subject to strict security and safety requirements, we provide our customers with engineering and project management services, as well as digital services and solutions to optimize the performance of complex infrastructure projects throughout their life cycle. The Group is currently ranked second in the world for nuclear engineering.

To ensure a viable, efficient, and reliable energy future for all

Job Title: Electrical & Instrumentation (E&I) Design Engineer

Industry: Water Supply & Sewerage Infrastructure
Department: Engineering / Design
Reports To: Project Manager / Lead E&I Engineer

Job Summary

The Electrical & Instrumentation (E&I) Design Engineer is responsible for detailed engineering, design, and coordination of electrical and instrumentation systems for water supply, sewerage networks, pumping stations, Water Treatment Plants (WTP), and Sewage Treatment Plants (STP). The role includes preparation of design documents, drawings, BOQs, technical specifications, vendor coordination, and support during execution and commissioning.

Key Responsibilities

1. Electrical Design – General

• Prepare electrical load calculations and power distribution schemes
• Design HT/LT systems (11kV/33kV/415V as applicable)
• Transformer sizing and substation layout design
• Diesel Generator (DG) sizing and synchronization schemes
• Cable sizing calculations (power & control cables)
• Preparation of Single Line Diagrams (SLD)
• Earthing and lightning protection system design
• Illumination and small power layout
• Preparation of BOQ and technical specifications
• Vendor drawing review and approval

2. Pumping Stations (Raw Water / Clear Water / Sewage)

• Design of electrical systems for:
  • Vertical turbine pumps
  • Submersible pumps
  • Horizontal centrifugal pumps
• Motor selection and control philosophy (DOL, Star-Delta, Soft Starter, VFD)
• MCC & PCC panel design
• PLC-based control system design
• SCADA integration for remote monitoring
• Design of:
  • Level control systems (ultrasonic, pressure transmitters)
  • Flow measurement (magnetic flow meters)
  • Pressure monitoring systems
• Surge protection and interlocking schemes
• Design of standby power systems

3. Water Treatment Plant (WTP) – E&I Design Activities

• Power distribution design for:
  • Clarifiers
  • Flash mixers
  • Flocculators
  • Rapid sand filters
  • Sludge handling systems
• Instrumentation design for:
  • pH analyzers
  • Turbidity meters
  • Chlorine analyzers
  • Flow meters (Raw water, treated water, backwash lines)
  • Pressure transmitters
  • Level transmitters
• PLC & SCADA architecture development
• Control philosophy documentation
• Field instrument layout and cable routing
• Preparation of:
  • Instrument index
  • I/O list
  • Cable schedule
  • Loop diagrams
• Panel GA drawings and wiring diagrams

4. Sewage Treatment Plant (STP) – E&I Design Activities

• Electrical design for:
  • Aeration blowers
  • SBR/MBBR systems
  • RAS/WAS pumps
  • Sludge dewatering units
  • Decanters
• Hazardous area classification (where applicable)
• Gas detection systems (H₂S, methane)
• DO (Dissolved Oxygen) monitoring systems
• MLSS monitoring systems
• Motorized valves and actuator control
• Integration with centralized SCADA system
• Energy-efficient system design (VFD-based control)

5. Pipe Network & Distribution System

• Electrical & instrumentation design for:
  • Flow monitoring stations
  • Pressure monitoring stations
  • District Metering Areas (DMA)
• Remote Terminal Units (RTUs) design
• Telemetry system design
• Solar-powered instrumentation (where applicable)
• Cathodic protection coordination (if required)
• Control panel design for booster pumping stations

Documentation & Deliverables

• Single Line Diagram (SLD)
• Control Schematics
• Instrument Hook-up Drawings
• Cable Tray Layout
• Earthing Layout
• Lighting Layout
• BOQ & Cost Estimation
• Technical Specifications
• FAT & SAT Documentation
• As-built drawings

Coordination Responsibilities

• Coordinate with:
  • Civil team (for foundation & equipment layout)
  • Mechanical team (pump & equipment data)
  • Process team (treatment philosophy)
  • Client & consultants
• Attend technical meetings
• Site visits and commissioning support
• Vendor inspections & FAT participation

Desired Skills

• Strong knowledge of pumping systems
• Understanding of water & wastewater treatment processes
• Knowledge of energy-efficient systems
• Analytical & problem-solving skills
• Good communication & documentation skills

Performance Indicators (KPIs)

• Timely submission of design deliverables
• Accuracy in BOQ and load calculations
• Zero major design revisions
• Smooth commissioning support
• Compliance with project specifications

Required Qualifications

• Bachelor’s Degree in Electrical / Instrumentation Engineering
• 5–12 years experience in Water / Wastewater infrastructure projects
• Knowledge of relevant standards (IEC, IS, IEEE)
• Experience in AutoCAD / EPLAN / ETAP / Dialux
• Experience in PLC (Siemens/Allen Bradley/Schneider) & SCADA systems

 **Security clearance**

This role requires the successful candidate to hold a minimum of a Security Check (SC) clearance without any caveats to that clearance.

Due to the nature of work this role will be delivering and for the protection of certain assets, the successful candidate has to be a UK national or in MoD approved cases a Dual National from a non-ITAR country.

We are committed to equal treatment of candidates and promote, as well as foster all forms of diversity within our company. We believe that bringing together people with different backgrounds and perspectives is essential for creating innovative and impactful solutions. Skills, talent, and our people’s ability to dare are the only things that matter !. Bring your unique contributions and help us shape the future.