Flickering lights, tripping breakers, or an outlet that just stopped working? Mercanti Electric provides electrical repair Hamilton homeowners can count on, with a licensed electrician who finds the actual cause and explains it in plain terms.
Most electrical problems don’t announce themselves clearly. A breaker that trips once might be nothing, or it might be the first sign of a connection that’s been failing quietly for months. A light that flickers could be a loose bulb, or it could be a loose neutral in your panel, which is a very different kind of problem. The tricky part about electrical troubleshooting isn’t fixing the issue once you know what it is, it’s figuring out what’s actually wrong in the first place, since the symptom you notice and the cause behind it are often in completely different parts of the system.
Mercanti Electric is the electrical repair Hamilton homeowners call for troubleshooting and repair services across the city and surrounding area, backed by Joseph Mercanti’s 13 years of experience and full ESA/ECRA licensing (#7017086). We diagnose the real problem before we start replacing parts, explain what we find in language that makes sense, and fix it properly the first time, whether that’s a five-minute repair or something that points to a bigger issue worth knowing about.
If more than one of these is happening at once, especially in the same part of the house, that’s usually a sign the issue is at a shared point in the circuit rather than isolated to one device.
Some of these are quick fixes once we know the cause, a loose connection, a failed switch, a damaged receptacle. Others point to something upstream, an aging panel, deteriorating aluminum connections, or wiring that was never installed correctly. We tell you which one you’re dealing with before we start any repair, not after.
If your Hamilton home was built between the mid-1960s and late 1970s, there’s a real chance it has aluminum branch circuit wiring instead of copper. It was a common, cost-driven choice during a period when copper prices spiked, and it isn’t illegal or automatically dangerous. The Ontario Electrical Safety Code permits aluminum wiring, and the Electrical Safety Authority is clear that it’s safe when proper connections and terminations are made without damaging the wire, using devices approved for aluminum and installed according to the code and manufacturer instructions.
The actual risk isn’t the wire running through your walls, it’s the connection points. Aluminum expands and contracts more than copper as it heats and cools, and over years that movement can loosen the connection at an outlet, switch, or panel terminal. A loose connection creates resistance, resistance creates heat, and heat at a connection point that isn’t rated for it is how problems start. This is also why insurers pay close attention to it: many insurance providers will charge more to cover a home with aluminum wiring, and some mortgage lenders may require the electrical to be updated as a condition of approval.
The standard fix isn’t ripping out the wiring. It’s a repair called pigtailing, connecting a short length of copper wire to each aluminum termination using a connector rated for aluminum-to-copper connections, so the aluminum wire never has to touch a device that wasn’t designed for it. Once that work is done and inspected, ESA issues a Certificate of Acceptance that you can provide to your insurer as documentation the wiring was properly assessed and repaired. If you’re not sure whether your home has aluminum wiring, a quick check of your panel and a few outlets by a licensed electrician will tell you.
Ontario’s electrical code changed on May 1, 2025, when the 29th edition of the Ontario Electrical Safety Code came into effect, and one of the biggest shifts was an expansion of arc-fault circuit interrupter, or AFCI, requirements in homes. Combination-type AFCI protection under Rule 26-658 now applies to branch circuits supplying 125-volt, 20-amp-or-less receptacles in dwelling units, extending coverage well beyond the bedroom-only requirement that used to be the standard.
An AFCI is different from a standard breaker or a GFCI. It reads the electrical waveform on a circuit and shuts the circuit down when it detects the signature of arcing, the kind of intermittent sparking that happens at a damaged wire or a failing connection long before it gets hot enough to trip a normal breaker or start a fire. This matters directly for repair work, because under ESA‘s guidance, when you extend an existing branch circuit with a new receptacle, arc-fault protection is required at the first added receptacle on that extension, even if the rest of the circuit is untouched older wiring. If you’re having a receptacle added or a circuit extended as part of a repair, this isn’t optional, it’s a code requirement we build into the work.
It’s worth knowing this isn’t just a compliance checkbox. ESA’s 2024 Ontario Electrical Safety Report found that electrical fires resulting in property loss dropped 10% between 2019 and 2023, and fires linked specifically to electrical distribution equipment like panels and breakers dropped 18% over that same period, a trend the industry largely credits to exactly this kind of expanded protection reaching more homes.
Homes built before the 1950s in older Hamilton neighbourhoods sometimes still have original knob and tube wiring, an early system using individual insulated conductors run through porcelain knobs and tubes rather than a single sheathed cable. It’s a century-old technology, but it isn’t automatically unsafe or illegal to keep. ESA‘s position is that knob and tube wiring is safe provided it’s properly maintained by a licensed electrical contractor, and the fact that the current edition of the code no longer includes installation rules for it doesn’t apply retroactively to wiring that’s already there.
That said, it comes with real limitations. ESA permits knob and tube to remain in service only if it’s protected by a 15-amp fuse or breaker, no additional outlets have been added beyond the original installation, and the conductors are in good condition. It also has no ground wire, which means it can’t safely support modern grounded appliances or electronics the way current wiring can, and many insurers either decline to cover homes with active knob and tube or require an electrical assessment first.
If your home has it, the right move isn’t necessarily a full rewire on day one. It’s a proper assessment to confirm the condition of the conductors and whether the existing protection meets what ESA requires, so you know exactly where you stand before an insurance renewal or a sale forces the issue.
We start by understanding what you’re experiencing, when it happens, how often, and whether it’s tied to a specific circuit, appliance, or area of the home.
We test the affected circuits, connections, and components to identify the actual cause, not just the symptom you noticed.
We walk you through what we found in plain language, what it means, and what the repair involves, before any work begins.
We complete the fix using proper materials and methods for the wiring type and circuit involved.
We test the repaired circuit under normal load to confirm the issue is actually resolved, not just masked.
Where the work requires an ESA permit, we pull it and provide you with the resulting inspection documentation for your records.
A rushed or poorly diagnosed electrical repair tends to fix the symptom without touching the cause, which means the same problem comes back, sometimes worse, within months. Watch for an electrician who replaces a breaker or outlet without testing why it failed in the first place, who can’t explain what caused the issue in terms you understand, or who avoids pulling a permit for work that clearly requires one. A proper repair should come with a clear explanation of the root cause, not just a part swap, and any work involving a new circuit, an extended circuit, or panel access should leave you with documentation you can keep on file. If a repair “solves” the problem but nobody can tell you why it was happening, that’s worth a second opinion.
Mercanti Electric provides electrical troubleshooting and repair services throughout:
Get the electrical repair Hamilton trusts, from a licensed electrician who finds the actual cause and explains it clearly.
A breaker trips repeatedly because it’s detecting a real fault, either an overloaded circuit, a short circuit, or a ground fault. Repeatedly resetting it without diagnosing the cause risks masking a developing problem rather than fixing it.
No. A warm or hot outlet almost always indicates a loose connection or an overloaded circuit and should be assessed by a licensed electrician promptly, since heat at a connection point is one of the earliest warning signs of a fire hazard.
Homes built roughly between 1965 and 1975 in Ontario are the most likely to have aluminum branch circuit wiring. A licensed electrician can confirm this quickly by checking the panel and a sample of outlets.
No. Existing knob and tube wiring is legal to keep in service provided it meets ESA’s conditions, proper overcurrent protection, no added outlets beyond the original circuit, and conductors in good condition. New knob and tube installation is no longer permitted under the current code.
It depends on the scope. Like-for-like replacement of a device typically doesn’t require a permit, but work involving new circuits, extended circuits, or panel access generally does. We handle permitting as part of every electrical repair Hamilton job when it’s required.
Flickering can range from a loose bulb to a loose neutral connection in your panel, which is a more serious issue. If flickering affects multiple rooms or gets worse when other appliances run, it’s worth having assessed rather than assumed to be minor.
Most residential troubleshooting calls are diagnosed the same visit. Some issues, particularly intermittent ones, may need a follow-up visit if the problem isn’t presenting itself at the time of the appointment.
