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Inside Electrical Category Codes
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| A: Residential |
| B: Industrial |
| C: Commercial/Institutional |
| D: Energy Management/Power Quality |
| E: Lighting Maintenance & Retrofit |
| F: Marine |
| G: Sign |
| H: Motor Repair |
| I: Instrumentation/Testing |
| J: Service - Residential |
| K: Service - Commercial & Industrial |
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Energy Solutions Category Codes
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| L: Green Building/Sustainable Construction |
| M: Energy Efficiency/Conservation |
| N: Energy Audits |
| O: Solar PV Systems |
| P: Wind Generation Systems |
| Q: Geothermal & Other Energy Alternatives |
| R: Solar/Wind Generation - Utility Scale |
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Line Category Codes
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| S: Substations |
| T: Transmission |
| U: Underground Distribution |
| V: Overhead Distribution |
| W: Distributed Generation/Cogeneration |
| X: Line Clearance/Tree Trimming |
| Y: Communications/Data (External) |
| Z: Street Lighting/Traffic Control |
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Systems Category Codes
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| 1: Communications/Data (Internal) |
| 2: Fire Alarm/Life Safety/Nurse Call |
| 3: Building Automation |
| 4: Industrial Controls |
| 5: Security Systems/CCTV/Access Control |
| 6: CATV |
| 7: Home Automation/Networking |
| 8: Sound/Public Address/Intercom/Paging |
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