EZSMART Corporation, ESA/ECRA #7012690 , North York , Ontario
Mon-Fri 08:00 AM - 05:00 PM
Bad electrical wiring is one of the leading causes of house fires in Canada — but the warning signs are surprisingly easy to spot if you know what to look for. If you are wondering how to know if your electrical wiring is bad, this guide walks through the seven signs every homeowner should recognize before small problems turn into serious hazards.
The most common signs of bad electrical wiring are frequent breaker trips, flickering or dimming lights, burning smells near outlets, warm or discoloured switch plates, buzzing sounds from walls, mild shocks when touching switches, and only two-prong outlets in a home built after 1965. Any single one of these deserves attention. Two or more happening at once is an urgent problem.
A buzzing outlet or a fishy smell from the wall usually means insulation is overheating. A fish or burning-plastic odour is one of the most reliable early warnings that wiring is failing behind the drywall.
Wiring deteriorates for a handful of predictable reasons: age (rubber and cloth insulation dries out and cracks), rodent chewing, water intrusion from roof leaks or basement floods, DIY splices done without junction boxes, and chronically overloaded circuits carrying more current than they were rated for. Aluminum branch wiring, common in Canadian homes built between 1965 and 1976, is a specific insurance and fire-safety concern.
Knob-and-tube wiring, found in homes built before 1950, is not automatically dangerous — but it becomes hazardous when covered with insulation or spliced with modern romex.
According to the Electrical Safety Authority of Ontario’s Electrical Safety Report, electrical distribution equipment — panels, wiring, and connections — is consistently one of the top ignition sources for residential fires in the province. Most of those fires start hidden inside walls, so the visible warning signs above are your only early notice.
Stop using the circuit and call a licensed electrician right away if you notice any of these: the smell of burning plastic, visible sparks from an outlet or switch, scorch marks around a plate, a breaker that trips the moment you reset it, or a warm spot on a wall with no heating source behind it. These are not “wait until Monday” issues.
For everything else — flickers, occasional trips, an aging panel — book a professional inspection. A qualified electrician can trace faults with thermal imaging and a wiring repair specialist can replace failing runs without gutting the whole house.
If your home was built before 1975 and has never been rewired, get an ESA-licensed inspection before your next insurance renewal. Many Ontario insurers now require documentation on aluminum branch wiring, knob-and-tube, and Federal Pacific panels — and quietly non-renew policies without it. Catching this proactively costs a few hundred dollars. Losing coverage or a claim costs tens of thousands.
Warm outlets, burning smells, frequent trips, flickering lights, shocks, or visible damage on accessible wiring.
No. Good copper NMD90 lasts 60+ years. Type and condition matter more than age.
For insurance and safety, usually yes. Confirm with a licensed contractor and your insurer.
Yes. A $20 outlet tester finds most common wiring faults in minutes.
Before major renovations, purchases, insurance renewals, or if you spot any warning signs.
Worried about your home’s wiring or want a professional inspection? Call us at 416-838-9006 or visit our contact page — we will be happy to help.
Electrician Since 2008 Journeyman Electrician Designated Master Electrician at EZSMART Corp
