A Licensed Electrical Contractor’s ECRA/ESA licence number is proof the business is authorized to offer electrical work in Ontario.
Castle Electric Safety Centre
Know the risk.
Make the safe call.
Plain-language guidance for everyday electrical safety, aging systems, life-safety equipment and commercial responsibilities—with direct links to Ontario’s Electrical Safety Authority.
Safety before symptoms
Protection works best before something fails.
Electrical safety is a system: suitable wiring, correct overcurrent and ground-fault protection, working alarms, inspected work and informed people. Use this page to recognize concerns—not to open equipment or attempt energized testing.
Most electrical work must be reported to ESA through a notification. A building permit is not the same thing.
ESA advises staying at least three metres from overhead powerlines and ten metres from downed lines.
Safety library
Homes, workplaces and everything between.
Breakers, fuses, GFCI and AFCI
Breakers and fuses protect wiring from excessive current. GFCI protection reduces shock risk in required locations. AFCI protection is intended to reduce fire risk from dangerous arcing. A device that repeatedly trips is reporting a condition—do not defeat it or repeatedly reset it without understanding why.
Request a protection review →Extension cords and power bars
Use cords only temporarily. Match the cord’s rating to the load and environment, keep it visible, inspect it before use and never run it through doors, windows, walls or ceilings. Do not daisy-chain cords or power bars, remove grounding pins, staple cords or bury extension cords.
ESA outdoor cord guidance ↗Smoke, CO and fire-alarm systems
Plan alarm locations, interconnection, power and replacement as a complete life-safety system. Residential smoke and carbon-monoxide alarms, and commercial fire-alarm work, must follow the requirements applicable to the building. Never paint over, disconnect or obstruct an alarm.
Emergency lighting and exit signs
Commercial emergency lights and exit signs need correct supply, battery equipment, coverage and ongoing testing. Renovations and layout changes can affect the life-safety plan. Failed units, damaged heads or dark exit routes should be addressed promptly.
Plan commercial safety work →Aging and damaged wiring
Knob-and-tube, aluminum branch wiring, ungrounded receptacles, brittle insulation, warm devices, corrosion and amateur alterations deserve an assessment. Age alone does not define the solution; condition, loading, access and intended use matter.
Start an aging-wiring review →Water, outdoors, docks and pools
Water and electricity demand appropriate equipment, bonding, ground-fault protection and wiring methods. Do not use wet equipment, enter water near suspected energized dock equipment or restore flood-affected electrical systems without qualified assessment.
Powerlines, digging and outdoor work
Look up before ladders, tree work or lifting materials. Keep people, tools and equipment away from overhead conductors. Stay well back from downed lines and call the utility or emergency services. Arrange locates before digging or trenching.
Commercial electrical safety
Document panel and circuit identification, maintain clear access to electrical equipment, plan lockout procedures, test emergency systems and investigate heat, odour, noise or recurring trips. Only qualified workers should access energized equipment.
Permits, notifications and inspections
ESA states that almost all electrical work must be reported through a notification before work starts. When you hire a Licensed Electrical Contractor, the contractor handles required notifications and inspection requests and can provide applicable acceptance documentation.
ESA notification and inspection guide ↗Official Ontario references
Continue with ESA.
These external links go directly to the Electrical Safety Authority. Requirements can change, so ESA remains the authoritative source for Ontario electrical-safety rules and consumer guidance.
Immediate danger
Smoke, fire, active arcing or a downed line?
Leave the area. Do not touch equipment or approach a downed conductor. Call 911 and the local electrical utility as appropriate.

