Commercial design specifications
We offer our standard construction drawings and design specifications to help developers, contractors and consultants design and build commercial 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 |
|---|---|---|
| ECG0003 | Residential Secondary Service Typical Ownership Demarcation | 2 |
| ECG0008 | Distribution System Voltage and Power Quality | 5 |
| ECP0020 | Electrical Vehicle Charging Connection Procedures for Commercial Customers | 0 |
| ECS0023 | Unmetered Service Conditions, Connections & Upgrades | 6 |
| ECS0031 | Digital Base Mapping Requirements for Electrical Servicing | 2 |
| ECS0043 | Underground Primary Service Typical Customer-Owned Switchgear Layout | 0 |
| GCG0001 | Installation & Testing of Underground Primary and Secondary Power Cables Prior to Energization | 5 |
| GCS0002 | Primary Voltage Services | 3 |
| GCS0005 | Installation of Civil Works for Underground Distribution | 11 |
| GCS0008 | Secondary Voltage Revenue Metering Specification | 6 |
| GCS0032 | Primary Revenue Metering Specification | 1 |
| GCS0038 | Trees in Proximity to Hydro Ottawa Underground Structures | 0 |
| GMS0003 | Low Profile, Single Phase, Dead Front Pad-Mounted Distribution Transformers with Separable Insulated High-Voltage Connectors | 2 |
| GMS0005 | Underground Secondary Cable Technical Specifications | 2 |
| GMS0008 | Underground Medium Voltage TRXLPE and EPR Concentric Neutral Cable | 4 |
| GMS0025 | Pole Mounted Single Phase MV-MV Distribution Transformers Specification | 1 |
| GQS0002 | Civil Contractor Qualifications To Work On or Around Hydro Ottawa Electrical Underground Distribution System | 4 |
| GQS0008 | Contractor Qualifications To Work On or Around Hydro Ottawa Electrical Overhead Distribution System | 1 |
| GQS0009 | Permitted Fibre Contractor Requirements | 0 |
| MCS0055 | OBSOLETE, refer to MCS0135 | 1 |
| UDS0013 | Temporary and Permanent Support of Hydro Ottawa Duct Banks When Undercut by an Excavation | 1 |
| UDS0022 | Protecting Electrical Distribution Plant & Support Structures from Vibrations Caused by Construction & Operation Activity | 4 |
| UDS0027 | Duct Pole Lateral for Self-Supporting Concrete Pole | 1 |
Drawings
| No. | Drawing title | Revision |
| ECG0001 | Commercial Secondary Ownership | 2 |
| ECG0004 | Unmetered Secondary Ownership | 1 |
| ECG0005 | Commercial Primary Service Electrical Ownership Demarcation Customer Owned Transformer | 2 |
| ECG0009 | Commercial Primary Service Electrical Ownership Demarcation Hydro Owned Transformer | 4 |
| ECS0027 | 15A @ 120V Receptacle on Utility Pole For Occasional Use Decorative Lighting | 1 |
| MCS0005 | RES 120V/208Y, 2PH, 3W, 100A to 200A Network Service Entrance and Meter Socket Wiring Detail | 4 |
| MCS0016 | COM 600V, 3PH, 3W Delta or 347V/600Y, 3PH, 4W Wye, ≤200A 7-Jaw Meter Base Wiring Detail | 4 |
| MCS0017 | 120V/208Y and 347V/600Y, 3PH, 4W, >200A to 600A Interval Metering with IT Cabinet | 7 |
| MCS0018 | ERF/AGR/COM/RES 1PH and 3PH, 4-Jaw, 5-Jaw, and 7-Jaw Wiring Detail | 3 |
| MCS0019 | COM/RES 120V/240V, 1PH, 3W, 400A Transformer Rated Service Using Combination Meter Socket Base | 3 |
| MCS0020 | COM/RES Multi Unit Building Typical Single Line Diagram with Unit Metering Options | 7 |
| MCS0023 | COM/RES Multi Unit Building Typical Building Distribution System with Unit Metering Options | 6 |
| MCS0024 | COM/RES 120V/208Y or 347V/600Y, 3PH, 4W, Non-Interval Metering Arrangement in a Switchboard with Peak Demand ≤233kW | 4 |
| MCS0025 | 120V/208Y and 347V/600Y, 3PH, 4W, >200A OR Primary Services Indoor Interval Metering With Switchboard/Switchgear | 8 |
| MCS0026 | 120V/208Y and 347V/600Y 3PH, 4W, >200A OR Primary Services Indoor Interval Metering with Double Ended Switchboard/Switchgear | 8 |
| MCS0035 | ERF/COM Concrete Base Foundation for Weatherproof Metered Cabinet | 5 |
| MCS0036 | COM/RES 1PH, 3W or 3PH, 4W Typical Secondary Service with Meter Centre | 5 |
| MCS0037 | COM/RES 120V/240V, 1PH, 3W, 100A to 400A Secondary Service with Multiple ≤200A Sub-Service Disconnects | 5 |
| MCS0043 | ERF/COM 1PH or 3PH, ≤200A Service Pedestal Mounted Metering Cabinet | 9 |
| MCS0059 | Single Multi-Customer Metering Unit Without Communications Equipment | 5 |
| MCS0060 | Multi-Customer Metering Units with Communications Equipment | 6 |
| MCS0071 | COM UG 120V/240V, 1PH, 3W, ≤200A Service Entrance Disconnect and Metering on Customer Owned Pole | 1 |
| MCS0072 | COM OH 120V/240V, 1PH, 3W, ≤200A Service Entrance Disconnect and Metering on Customer Owned Pole | 1 |
| MCS0073 | COM UG 120V/208Y or 347V/600Y, 3PH, 4W, ≤200A Service Entrance Disconnect and Metering on Customer Owned Pole | 1 |
| MCS0074 | COM 120V/240V, 1PH, 3W, ≤100A Temporary UG Unmetered Load Monitoring Facility | 1 |
| MCS0081 | COM 1PH, 3W, or 3PH, 4W, ≤600A Telecom Outdoor Service for Controlled Access/Fenced Area Using Splitter Trough | 2 |
| MCS0082 | COM 120V/240V, 1PH, 3W, ≤600A Secondary Metered Utility Tower Service with 5-Position Ganged Meter Trough | 2 |
| MCS0091 | COM 120V/240V, 1PH, 3W, ≤200A Secondary Service with Meter Socket Wiring Detail | 1 |
| MCS0096 | COM 120V/208Y or 347V/600Y, 3PH, 4W, 100A to 200A Secondary Service with Meter Socket Construction and Wiring Detail | 1 |
| MCS0099 | Outdoor Customer Owned Enclosure Housing HOL Metering Equipment | 2 |
| MCS0103 | COM 120V/208Y or 347V/600Y, 3PH, 4W, ≤200A Sub-Services, Customer Owned Outdoor Meter Centre or Switchboard with Check Metering | 0 |
| MCS0105 | AGR/COM/DER/RES Minimum Clearances in Front of Revenue Metering Equipment | 2 |
| MCS0106 | AGR/COM/DER/RES Minimum Clearance Next to Revenue Metering Equipment | 5 |
| MCS0109 | COM/RES OH/UG 347V/600Y, 3PH, 4W, ≤400A with 120V/240V 1PH or 120V/208Y 3PH Dry-Core | 0 |
| MCS0110 | Metering Systems, Single Panel, Communication Wiring for Electrical Rooms with Communications Equipment | 0 |
| MCS0111 | COM Outdoor Secondary 1-Phase or 3-Phase ≤200A Metered Cabinet Wall Mounted | 0 |
| MCS0115 | General Secondary Service Electrical Closet Clearances for Meter Centre and MCMU Installations | 1 |
| MCS0116 | 120V/208Y and 347V/600Y, 3PH, 4A, >200A OR Primary Services Interval Metering Outdoor Type Installation | 0 |
| MCS0117 | Overhead Three Phase Primary Metering Installation – Customer Service | 1 |
| MCS0129 | Typical Indoor Interval Metering with Wireless Modem Enclosure | 2 |
| MCS0135 | Multiple Customer Metering System for Existing Buildings Supply and Installation Requirements | 1 |
| MCS0136 | Temporary Secondary Service COM 1PH or 3PH ≤600A General Service Layout | 0 |
| MCS0137 | COM 120/240V, 1PH, 3W, 225A to 800A Transformer Rated Service | 2 |
| MCS0146 | Overhead Central Metering Installation, 120/240V, 1PH, 3W | 0 |
| MCS0147 | Underground Central Metering Installation with Meter Post, 120/240V,1PH, 3W | 0 |
| OLS0002 | Clearances to Adjacent Structures, 2.4/4.16kV – 44kV | 3 |
| UCS0001 | Transformer Base & Pad, 3 Phase 150kVA – 2500kVA | 5 |
| UCS0004 | Transformer or Switchgear Base & Pad | 3 |
| UCS0013 | Manhole Precast 2 Way 590 | 12 |
| UCS0014 | Manhole Precast 2 Way 612 | 12 |
| UCS0015 | Manhole Precast 4 Way 1010 | 8 |
| UCS0018 | Maintenance Hole Collar | 7 |
| UCS0020 | Manhole Hardware Frame | 5 |
| UCS0021 | Manhole Hardware Cover | 6 |
| UCS0025 | Maintenance Hole Precast 2 Way Switching 612 | 17 |
| UCS0026 | Switchgear Pad & Base | 5 |
| UCS0027 | Switch Pad on 612 Switching Manhole Base | 4 |
| UCS0028 | Manhole Precast Pulling Chamber Pad | 4 |
| UCS0035 | Transformer Pad on 612 Equipment Maintenance Hole Base 3 Phase | 3 |
| UCS0045 | Equipment Maintenance Hole Collar | 0 |
| UDS0001 | Duct Concrete Cross Sections | 11 |
| UDS0004 | Duct Transposition Various Configurations | 3 |
| UDS0005 | Manhole Duct Termination | 3 |
| UDS0007 | Duct Concrete Spacers | 3 |
| UDS0009 | Building Vault Supply Cable Pulling Chamber | 2 |
| UDS0010 | Duct Pole Lateral Sump Tray | 3 |
| UDS0011 | Duct Support Temporary of Existing Structure | 4 |
| UDS0012 | Duct Support Permanent of Existing Structure | 4 |
| UDS0023 | Duct Pole Lateral for Wood Pole | 11 |
| UDS0033 | Duct Transposition from 1H x 6W to 2H x 3W | 0 |
| UDS0034 | Duct Transposition from 1H x 10W to 3H x 4W | 0 |
| UDS0035 | Duct Transposition from 1H x 16W to 4H x 4W | 0 |
| UDS0038 | Duct Transposition from 1H x 12W to 3H x 4W | 0 |
| UFS0001 | Bollards Protective | 4 |
| UGS0002 | Grounding Transformer or Switchgear Base | 9 |
| UGS0005 | Grounding Precast 2 Way Switching Manhole 612 | 5 |
| UGS0007 | Grounding Transformer Base & Switchgear Manhole Combination Side by Side | 3 |
| UGS0008 | Grounding Transformer Base & Switchgear Manhole Combination End to End | 2 |
| UGS0011 | Grounding Two 612 Switching Equipment Maintenance Holes Side by Side | 1 |
| UKS0271 | Secondary Pole Riser on Hydro Wood Pole | 0 |
| UTS0038 | Transformer Clearances Transformer & Switchgear Pad | 4 |