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City of O'Fallon (IL)

Illinois Authority Having Jurisdiction Solar permitting requirements
NEC Code Version2020
Fire Code Version2018 Building Code
SolarAPP+ StatusTargeted
Wet Stamps RequiredDigital Structural
Fire Setback Enforced1

Codes

NEC Code Version
2020
Fire Code Version
2018 Building Code
Code List

2021 INTERNATIONAL RESIDENTIAL CODE

2021 INTERNATIONAL BUILDING CODE

2021 INTERNATIONAL FIRE CODE

2021 INTERNATIONAL EXISTING BUILDING CODE

2020 NATIONAL ELECTRIC CODE AND ADDITIONAL CITY OF O’FALLON REGULATIONS AND STANDARDS EXCERPT FROM ORDINANCE 4163

2021 INTERNATIONAL MECHANICAL CODE

2021 INTERNATIONAL FUEL GAS CODE

2021 INTERNATIONAL ENERGY CONSERVATION CODE WITH STATE OF ILLINOIS REVISIONS

2021 INTERNATIONAL PROPERTY MAINTENANCE CODE ILLINOIS PLUMBING CODE

2021 SWIMMING POOL & SPA CODE

ASCE Code Specification
ASCE 7-16

SolarAPP+ & submittal

SolarAPP+ Status
Targeted
Any SolarAPP+ Restrictions
1
SolarAPP+ Restrictions
MPU,Derate
How Many Plansets Required
1
Revision Required
1
Rough Inspection
None
New Planset Required For Module Swap
0

Stamps

Ee Stamp Required On SLD
Yes - Battery
Wet Stamps Required
Digital Structural
Structural Calculations Required
Yes
Stamp Location On Plans
Unspecified

Fire setbacks

Fire Setback Enforced
1
Setback Notes

Standard

Structural & loads

Wind Speed
90
Snow Load
20
Reducible Snow Load Allowed
1
Max Attachment Spacing
96
Structural Notes

Standard

Minimum Ground On Roof
#10

Electrical

AC Disconnect Required
Yes
Electrical Load Calcs Required
Derates
Allowed POI
Meter Adapter,PV Breaker,Line Side Taps,Load Side Taps
Panel Schedule Required
Partial Home Backup
Temperature Rating
90
De Rating Ampacity
0.91

Battery / ESS

Unique Battery Placards Needed
0
ESS Notes
  • AHJ doesn’t allow SEEB batteries to be installed outside, only Tesla batteries, due to SEEB having operational temperatures of 14 deg. while Tesla's is -4 deg.
Separate ESS Disconnect Required
ESS Disconnect
ESS Elevation Detail Required
No

Plan set

Plan Set Requirements
  • Attic runs have to be hard pipe EMT. Exterior runs have to be EMT
  • Attach ESS installation manual if project has an ESS.
Site
  • Make sure legend callouts match equipment used
Roof Plan
  • Make sure legend callouts match equipment used
Custom Placards Required
1
Placards Notes
  • Utility requires placards

Ground mount

Ground Mount Fencing Required
Mesh/Scrim
Compiled from public records, 2026. Requirements change with code cycles and local amendments. Verify with the City of O'Fallon (IL) building department before you rely on this, and treat it as a research head start, not a ruling. Getting quotes? Run them through the quote checker first.