Residential design specifications
We offer our standard construction drawings and design specifications to help developers, contractors and consultants design and build residential electrical systems.
These documents are available for free and can serve as reliable references for your projects. They cover various aspects of electrical service, including:
Service connections
Details on underground and overhead services, including typical layouts and ownership demarcation
Metering
Guidelines for primary and secondary voltage revenue metering installations
Cabling
Specifications for underground secondary cables and installation procedures
Equipment layouts
Designs for pad-mounted transformers and switchgear
Mapping and documentation
Requirements for digital base mapping and unmetered service conditions
These documents remain Hydro Ottawa’s intellectual property and should be used only as a construction reference. We will post new drawings and specifications to this page as they become available.
Specifications
No. | Specification title | Revision |
Electrical & Civil Distribution As-Built Construction Drawings | 4 | |
Electrical Distribution GIS & CAD Construction Drawing Standard | 6 | |
Distribution System Voltage and Power Quality | 5 | |
Digital Base Mapping Requirements for Electrical Servicing | 2 | |
Underground Residential Distribution Installation of Civil Work | 2 | |
Underground Primary & Secondary Cable Installation | 4 | |
Installation of Civil Works for Underground Distribution | 11 | |
Secondary Voltage Revenue Metering Specification | 6 | |
Trees in Proximity to Hydro Ottawa Underground Structures | 0 | |
Low Profile, Single Phase, Pad-Mounted Distribution Transformers with Separable Insulated High-Voltage Connectors | 2 | |
Underground Secondary Cable Technical Specifications | 2 | |
Underground Medium Voltage TRXLPE and EPR Concentric Neutral Cable
| 3 | |
Civil Contractor Qualifications to Work On or Around Hydro Ottawa Electrical Underground Distribution System
| 4 | |
Contractor Qualifications to Work On or Around Hydro Ottawa Electrical Overhead Distribution System
| 1 | |
Temporary and Permanent Support of Hydro Ottawa Duct Banks When Undercut by an Excavation
| 1 |
Drawings
No. | Drawing title | Revision |
Residential Secondary Ownership | 1 | |
RES OH 120V/240V, 1PH, 3W, ≤200A Service Entrance | 1 | |
RES UG 120V/240V, 1PH, 3W, ≤400A Secondary Service | 10 | |
Installation & Testing of Underground Primary and Secondary Power Cables Prior to Energization | 4 | |
Rural Estate Lot XFMR and Trench Location | 1 | |
RES 120V/208Y, 2PH, 3W, 100A to 200A Network Service Entrance and Meter Socket Wiring Detail | 4 | |
ERF/AGR/COM/RES 1PH and 3PH, 4-Jaw, 5-Jaw and 7-Jaw Wiring Detail | 3 | |
COM/RES 120V/240V, 1PH, 3W, 400A Transformer Rated Service Using Combination Meter Socket Base | 3 | |
RES UG 120V/240V, 1PH, 3W, ≤400A Multiposition Ganged Meter Trough | 9 | |
RES UG 120V/240V, 1PH, 3W, ≤200A Service Entrance Disconnect and Metering on Customer Owned Pole | 1 | |
RES OH 120V/240V, 1PH, 3W, ≤200A Service Entrance Disconnect and Metering on Customer Owned Pole | 1 | |
RES 120V/240V, 1PH, 3W, 400A Transformer Rated Service Upgrade Using Combination Meter Socket Base | 1 | |
RES 120V/240V, 1PH, 3W, ≤200A Residential Service Metering Using External Modem Enclosure with Telephone Line for Communications | 1 | |
AGR/COM/DER/RES Minimum Clearance in Front of Revenue Metering Equipment | 2 | |
AGR/COM/DER/RES Minimum Outdoor Clearances Next to Revenue Metering Equipment | 5 | |
RES OH 120V/240V, 1PH, 3W, ≤200A Multiposition Ganged Meter Trough | 2 | |
Clearances to Adjacent Structures 2.4/4.16kV – 44kV | 4 | |
Transformer Base & Pad 1 Phase 25kVA – 167kVA | 7 | |
Transformer or Switchgear Base & Pad | 4 | |
Duct Concrete Cross Sections | 11 | |
Trench Joint Utility 3 Party Main Residential | 8 | |
Trench Joint Utility 3 Party Service Residential | 7 | |
Duct Concrete Spacers | 2 | |
Trench for Direct Buried Cable and Duct | 6 | |
Duct Support Temporary of Existing Structure | 4 | |
Duct Support Permanent of Existing Structure | 4 | |
Trench Joint Utility 4 Party Main Residential | 7 | |
Trench Joint Utility 4 Party Service Residential | 6 | |
Trench Joint Utility 3 Party Service Residential in Rock | 5 | |
Duct Pole Lateral for Wood Pole | 11 | |
Four Party Residential Road Crossing Concrete Duct Bank | 1 | |
Three Party Residential Road Crossing Concrete Duct Bank | 1 | |
Trench Joint Utility 4 Party Main Residential | 2 | |
Three Party Service Trench with Multiple Services | 0 | |
Direct Buried Duct to Offset Single Phase Transformer | 0 | |
Trench Joint Utility 3 Party Main Residential | 2 | |
Trench Joint Utility 3 Party Main Residential Road Crossing | 1 | |
Trench Joint Utility 4 Party Main Residential Road Crossing | 1 | |
Trench Joint Utility 4 Party Main Residential Under Integrated Sidewalk | 0 | |
Trench Joint Utility 4 Party Main Residential Hydro Concrete Encased | 0 | |
Bollards Protective | 4 | |
Grounding Transformer or Switchgear Base | 9 | |
Grounding Precast 2 Way Switching Manhole 612 | 6 | |
Grounding Transformer Base & Switchgear Manhole Combination Side by Side | 3 | |
Grounding Transformer Base & Switchgear Manhole Combination End to End | 2 | |
Grounding Two 612 Equipment Maintenance Holes Side by Side | 1-3 | |
Secondary Pole Riser on Hydro Wood Pole | 0 | |
Transformer Secondary Wiring 1 Phase Padmount | 4 | |
Transformer Primary Wiring 1 Phase Padmount | 4 | |
Transformer Grounding 1 Phase Padmount | 4 | |
Transformer Clearances Residential Underground Utility Trench 3 & 4 Party | 10 | |
Transformer Clearances Transformer & Switchgear Pad | 4 |