Engineering Drawings & Plans

At K.B. Kastrati Sàrl, our engineering team develops complete, permit-ready drawing sets for solar energy systems and supporting structures—accurate, compliant, and optimized for installation efficiency and long-term reliability.

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What we deliver (scope & outputs)

Site Layout & Roof Plan (array layout, setbacks, pathways, access/egress)
Electrical Single-Line & Three-Line Diagrams (inverters, combiners, protection)
Structural Plans & Calculations (mounting, anchorage, wind/snow actions)
Cable Routing & Conduit Schedules (DC/AC runs, voltage drop checks)
Bill of Materials (BOM) with part numbers and quantities
Monitoring & SCADA Schematics (if requested)
As-Built Drawings after commissioning
O&M Documentation (maintenance intervals, torque specs, warranty binder)

Formats: PDF for review/permits; DWG/DXF for architects; CSV/XLSX for BOM; IFC/BIM on request.

Compliance & standards (Switzerland-ready)

Our designs adhere to relevant Swiss/EU codes and IEC standards, including:

IEC 61215 / 61730 (module design & safety), IEC 62446-1 (system documentation, testing)
IEC 60364 (electrical installations), surge protection per IEC 61643
SIA 260/261/265 (structures, actions on structures, timber), SN EN 1991 (wind/snow)
Municipal permitting requirements (e.g., Canton Vaud), utility interconnection specs
Firefighter access and roof pathway conventions; labeling per local utility guidelines

(If a structure exceeds local height thresholds or is near flight paths, we coordinate with FOCA rules.)

Our process (fast, transparent, documented)

Survey & Inputs — Site data, roof build-up, photos, utility info, and preferred hardware.
Preliminary Layout — Array options, yields, shading study, and structural concept.
Engineering Package — Full plans, calcs, SLD/3LD, BOM, draft for your approval.
Authority Review — We adjust per municipal/utility comments until permit-ready.
As-Built & Handover — Final drawings, test results, and O&M handoff.

Typical lead time: 5–10 working days after complete inputs (complex projects may vary).

Drawing set tiers

Residential Set (up to 30 kW): Roof plan, SLD, structural notes, BOM, labels.
Commercial Set (30–500 kW): Layout alternatives, SLD/3LD, calcs, conduit plan, SCADA.
Special Structures (trackers, carports, façades): Advanced calcs, shop drawings, fabrication details.