Important: This is an illustrative engineering scenario, not a claim that SN Engineering completed this specific project. It is intended to demonstrate a possible problem-solving workflow.
Scenario Background
A hospital required a structured review for solar rooftop integration. The scenario assumes that project drawings, electrical information, roof geometry, incoming services, soil conditions and operating consequences are available for review.
Key Project Challenges
- Coordinating direct-strike protection with sensitive electrical and electronic systems.
- Maintaining short, accessible and corrosion-compatible current paths.
- Integrating lightning earthing with the overall earthing philosophy.
- Selecting and coordinating SPDs for power, data, telecom and control circuits.
- Preparing measurable BOQ and traceable handover documents.
Inputs
Dimensions, height, roof layout, SLD, equipment list, soil data and existing test reports.
Analysis
Risk, protected zones, conductor routes, bonding, earth termination and SPD locations.
Deliverables
Design basis, drawings, BOQ, method statement, ITP and commissioning checklist.
Handover
As-built drawings, photographs, tests, warranty and O&M records.
Illustrative Engineering Approach
- Review the existing condition and project constraints.
- Define the applicable design basis.
- Prepare roof and elevation protection studies.
- Plan down-conductor routes and bonding points.
- Coordinate earth termination and SPD schedules.
- Prepare BOQ and inspection hold points.
- Inspect installation and complete testing.
- Issue as-built and maintenance documentation.
Illustrative BOQ Groups
| Group | Typical Scope | Verification |
|---|---|---|
| Air Termination | Terminals, masts, mesh conductors and supports | Protected-zone drawing |
| Down Conductors | Conductors, clamps, guards and test joints | Route and continuity |
| Earthing | Electrodes, ring/grid, pits, backfill and bonds | Soil, continuity and tests |
| Surge Protection | Power, data, telecom and control SPDs | Rating and coordination |
| Documentation | Calculations, drawings, ITP, tests and O&M | Traceability |
Illustrative Lessons Learned
- Early coordination reduces rework and scope disputes.
- Low earth resistance alone does not prove complete protection.
- Roof modifications can invalidate earlier protected-zone assumptions.
- SPD lead length and bonding quality strongly affect surge performance.
- As-built documentation is essential for future maintenance.
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Frequently Asked Questions
Is this a real completed project?
No. It is an illustrative scenario unless separately supported by project evidence.
Can the same solution be copied to another site?
No. Each project requires review of its own geometry, electrical systems, soil, risk and contract requirements.
Project-Specific Engineering
Real projects require actual drawings, site data, tests and approved contract documents.