Outdoor and power line safety
Find out how to keep your crews safe around power lines, trees and equipment. You’ll also learn more about your own safety-related responsibilities as a contractor.
How to stay safe around power lines, trees and utility equipment when planning your outdoor projects
You should always assume downed power lines are energized and dangerous. Power lines can be knocked down during storms and by vehicle crashes. They can also come down when equipment fails. If you see a downed or damaged power line:
If a power line lands on your vehicle:
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Overhead lines carry high-voltage electricity. You don't need to touch them to get a shock. This is because electricity can arc through the air, especially when tools get too close. Minimum clearance distances Always remain at a safe distance from power lines. How far is safe?
These safe distances apply to you, your tools, ladders, equipment, tree branches, or anything you’re handling. If you’re unsure how far to stay back or need to work near power lines, contact a licensed electrical contractor or contact us for guidance. Safety tips for contractors
Planning a new building or renovation near power lines? Check out our brochure for information about clearance standards and requirements. | Watch the video below to learn more about safety around power lines. |
Maintain a safe perimeter around this equipment. Always report anything that looks damaged or out of place.
Pad-mounted transformers (green boxes):
These locked metal cabinets contain high-voltage equipment.
- Never sit on, climb or tamper with them.
- Keep the front of the unit clear. Do not block access with fences, signs, landscaping or snow piles.
- Ensure your snow removal crews leave clearance in the winter.
Pole-mounted transformers:
- These are mounted on hydro poles throughout your neighbourhood.
- Always stay at least three metres away. Electricity can arc through the air even without direct contact.
Substations and fenced enclosures
These stations reduce our electricity’s voltage before we distribute it.
- Never enter or go near fenced substations, even to get tools.
- Report open gates, damaged fences or signs of vandalism immediately.
Tip: Post safety signs in outdoor areas that can be clearly seen by employees and subcontractors. Ensure your project managers know who to call if the equipment is blocked or damaged.
To report damaged or unsecured equipment, call Hydro Ottawa Customer Service at (613) 738-6400 or visit our Contact Us page.
Locate underground utilities before you do any digging.
To dig safely
- Submit a locate request at OntarioOneCall.ca at least five business days before you plan to dig.
- Wait for the utility locates to be marked before you start.
- Respect locate markings. Dig with care.
- Stay at least one metre away from marked power lines
⚠️ This service is free. Ontario law requires it under the Occupational Health and Safety Act.
Learn more about the full process and best practices on our Locates and safe digging page.
If you work with pools, hot tubs, spas or water features (e.g., in hotels, gyms or multi-unit properties):
- Electrical equipment must meet clearance rules for both overhead and underground wiring.
- Contact OntarioOneCall.ca before you dig or install structures to have underground utilities marked.
- Get all necessary permits.
- Consult a licensed electrical contractor to ensure the project meets Electrical Safety Authority requirements.
Download our brochure for more guidance on how to safely install a hot tub or swimming pool near electrical wires.
Hydro Ottawa crews work in all conditions to maintain and upgrade the electricity distribution system. If you see crews near your work site, follow these safety tips:
- Follow all signs and instructions from our crew members. Even if no one is present, the equipment may still be dangerous.
- Keep vehicles and pedestrians clear of work zones.
- Tell your crew if access points or entrances are temporarily blocked.
Report safety concerns
To report unsafe conditions near a Hydro Ottawa crew, call (613) 738-6400 or visit our Contact Us page.