About this role
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 schemesDesign HT/LT systems (11kV/33kV/415V as applicable)Transformer sizing and substation layout designDiesel Generator (DG) sizing and synchronization schemesCable sizing calculations (power & control cables)Preparation of Single Line Diagrams (SLD)Earthing and lightning protection system designIllumination and small power layoutPreparation of BOQ and technical specificationsVendor drawing review and approval2. Pumping Stations (Raw Water / Clear Water / Sewage)
Design of electrical systems for:Vertical turbine pumpsSubmersible pumpsHorizontal centrifugal pumpsMotor selection and control philosophy (DOL, Star-Delta, Soft Starter, VFD)MCC & PCC panel designPLC-based control system designSCADA integration for remote monitoringDesign of:Level control systems (ultrasonic, pressure transmitters)Flow measurement (magnetic flow meters)Pressure monitoring systemsSurge protection and interlocking schemesDesign of standby power systems3. Water Treatment Plant (WTP) – E&I Design Activities
Power distribution design for:ClarifiersFlash mixersFlocculatorsRapid sand filtersSludge handling systemsInstrumentation design for:pH analyzersTurbidity metersChlorine analyzersFlow meters (Raw water, treated water, backwash lines)Pressure transmittersLevel transmittersPLC & SCADA architecture developmentControl philosophy documentationField instrument layout and cable routingPreparation of:Instrument indexI/O listCable scheduleLoop diagramsPanel GA drawings and wiring diagrams4. Sewage Treatment Plant (STP) – E&I Design Activities
Electrical design for:Aeration blowersSBR/MBBR systemsRAS/WAS pumpsSludge dewatering unitsDecantersHazardous area classification (where applicable)Gas detection systems (H₂S, methane)DO (Dissolved Oxygen) monitoring systemsMLSS monitoring systemsMotorized valves and actuator controlIntegration with centralized SCADA systemEnergy-efficient system design (VFD-based control)5. Pipe Network & Distribution System
Electrical & instrumentation design for:Flow monitoring stationsPressure monitoring stationsDistrict Metering Areas (DMA)Remote Terminal Units (RTUs) designTelemetry system designSolar-powered instrumentation (where applicable)Cathodic protection coordination (if required)Control panel design for booster pumping stationsDocumentation & Deliverables
Single Line Diagram (SLD)Control SchematicsInstrument Hook-up DrawingsCable Tray LayoutEarthing LayoutLighting LayoutBOQ & Cost EstimationTechnical SpecificationsFAT & SAT DocumentationAs-built drawingsCoordination Responsibilities
Coordinate with:Civil team (for foundation & equipment layout)Mechanical team (pump & equipment data)Process team (treatment philosophy)Client & consultantsAttend technical meetingsSite visits and commissioning supportVendor inspections & FAT participationDesired Skills
Strong knowledge of pumping systemsUnderstanding of water & wastewater treatment processesKnowledge of energy-efficient systemsAnalytical & problem-solving skillsGood communication & documentation skillsPerformance Indicators (KPIs)
Timely submission of design deliverablesAccuracy in BOQ and load calculationsZero major design revisionsSmooth commissioning supportCompliance with project specifications
Required Qualifications
Bachelor’s Degree in Electrical / Instrumentation Engineering5–12 years experience in Water / Wastewater infrastructure projectsKnowledge of relevant standards (IEC, IS, IEEE)Experience in AutoCAD / EPLAN / ETAP / DialuxExperience 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.