On electrical projects that connect to the DEWA network, the schedule is often decided by paperwork before the first cable is pulled. A load upgrade, a pocket substation or a new LV/HV room all follow the same basic path: approvals first, construction second, inspections and energisation last. This article walks through that path as we see it on site, so owners and consultants know what to line up early.
1. Confirm the load and the design basis
Everything downstream depends on the required load and voltage level. Make sure the consultant's design and load calculations match what the owner actually needs, including future expansion. Changing the load after approvals are in place usually means going back through earlier steps.
2. Get the NOC and approved drawings in place
No civil or electrical work should touch the network connection until the No Objection Certificate and approved drawings are on file. Typical submission items include:
- Single-line diagrams and the load schedule
- Substation or LV room layout with clearances and access
- Cable routes and trench details
- Earthing and lightning protection design
- Consultant-endorsed drawings and calculations
3. Build the civil works to the approved layout
Pocket substations and LV rooms are small buildings with strict requirements. On our additional transformer and LV room project at a warehouse in Dubai South, the civil package covered excavation, foundations for the transformer and LV room, cable trenches, blockwork, plastering and painting, waterproofing, and fire fighting and air conditioning. The electrical package then followed with LV panels, containment and cables, ending with DEWA approval, testing and connection.
The lesson is sequencing: trenches, sleeves and foundations must match the approved drawings, because rework after inspection is far more expensive than checking before pouring.
4. Equipment, cables and containment
Confirm early that panels, meter cabinets, cables and accessories are acceptable for the authority and match the approved design. Lead times on panels and transformers can be longer than the civil works, so order against the approved submission rather than waiting for the room to be finished.
5. Earthing and lightning protection
Earthing is one of the items inspectors look at closely. We have installed structural earthing meshes using bare copper conductor and steel electrodes at 132/11 kV substations, including the Mirdif City Centre and Dubai Studio City contracts. Whatever the scale, keep installation photos, earth pit details and test records as you go.
6. Testing, inspection and energisation
Before requesting an inspection, the works should be complete and tested. A pre-inspection checklist helps:
- Approved drawings and NOC available on site
- Civil works complete, including waterproofing and fire fighting provisions
- Cable installation, glanding and termination complete and labelled
- Insulation resistance and earth resistance test results recorded
- Protection settings confirmed by the consultant
- Snag list closed and as-built drawings prepared
Common causes of delay
- Incomplete or late submissions
- Design or load changes after approval
- Materials that do not match the approved design
- Inspection requested before civil or fire-fighting works are finished
- Missing test records and as-built drawings
Getting these six areas right early is usually worth more than any amount of acceleration later on site.
This article is general information based on our project experience. It is not a substitute for advice from your consultant or the relevant authority on a specific project.
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