Submitting an incomplete or inaccurate solar permit plan set to your local building department (AHJ) is the number one cause of installation delays and lost contractor profit. Building officials scrutinize everything from conduit fill calculations to fire department roof setbacks.
What Sheets Must Be Included in a Code-Compliant Plan Set?
1. Sheet S-1: Cover Sheet & Project Summary
Governing building codes (NEC, IBC, IRC, IFC), scope of work, parcel/APN numbers, designer & contractor info, system DC/AC kW ratings, and index of drawings.
2. Sheet S-2: Roof Layout, Array Map & Fire Setbacks
Scaled roof plan showing module layout, azimuth, tilt, emergency fire pathways (36-inch ridge and valley setbacks per IFC/IRC), and rafter/truss span lines.
3. Sheet E-1: Electrical 3-Line & Single-Line Diagram (SLD)
Conductor sizes, conduit types, string configurations, inverter specs, main service panel bus/breaker ratings, 120% rule calculations, and point of interconnection (POI).
4. Sheet E-2: NEC Warning Labels & Placard Map
Exact text, ANSI/UL 969 rating, color schemes, and physical equipment placement for all solar & ESS safety warning placards.
5. Structural Calculations & Attachment Details
Lag bolt pullout calculations, attachment spacing schedules, ASCE 7 wind and snow load checks, and manufacturer racking engineering reports.
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