Ill. Admin. Code tit. 83, § 411.TABLE A
| Interruption Cause Categories | Interruption Code Description |
| Other Alternative Retail Electric Supplier or Other Utility | Loss of Supply Operating Event |
| Jurisdictional Entity/Contractor Personnel-Errors | Unclassified Error Switching Error Accident by Jurisdictional Entity Testing Error Dig-In by Jurisdictional Entity Accident by Jurisdictional Entity Contractor Dig-In by Jurisdictional Entity Contractor |
| Customer | Overload Customer Request Customer Equipment Non-payment of Bill Tampering with Service Access to Equipment Denied Interruptible Service Tariff or Contract |
| Public | Foreign Object Fire Vandalism Accident by Others Dig-In by Others Vehicles |
| Weather Related | Lightning Wind Ice Extreme Cold Extreme Heat Flooding |
| Animal Related | Wildlife Birds Snakes Squirrels Other |
| Tree Related | Tree Contact Primary Secondary Service Drop Limb Broken Primary Secondary Service Drop |
| Overhead Equipment Related | Contamination Malfunction Broken Fuse Link |
| Underground Equipment Related | Underground Failure Contamination Malfunction |
| Intentional | Scheduled Construction, Maintenance or Repair Emergency Repairs Protection of System Integrity |
| Transmission and Substation Equipment Related | Contamination Transmission System Outage Substation Equipment |
| Unknown | Unknown* |
| Other | Other |
* This category shall not be used if a reasonable and customary investigation should be expected to determine the proper cause of the interruption for which one of the other categories would be more appropriate.