| 925.31 Electrical Engineering (Incl. Cogeneration Design Services) |
| 925.33 Engineer Services, Professional |
| 925.34 Energy Management Engineering |
| 925.36 Engineering Services (Not Otherwise Classified) |
| 925.37 Facilities Design Services, Engineering |
| 925.39 Fire Protection Engineering |
| 925.44 General Construction: Management, Scheduling, Cost Estimation - Engineering |
| 925.55 Inspecting, General/Engineering |
| 925.57 Instrumentation/Engineering |
| 925.78 Power Generation, Transmission, Distribution - Engineering |
| 925.95 Utilities (Gas, Steam, Electric)/Engineering |
| 925.96 Waste Water Treatment Engineering |