A generator that isn’t connected properly doesn’t just risk your home, it can kill the utility worker restoring power down the street. Mercanti Electric installs code-compliant, permitted generator connections that keep your home and everyone else safe.
When the power goes out, the instinct is to get a generator running as fast as possible, but generator installation Hamilton homeowners can rely on starts with doing the connection safely, not just quickly. But how a generator gets connected to your home matters just as much as having one, and it’s the part most homeowners don’t think about until an electrician explains it. A generator wired directly into your home’s system without the right equipment doesn’t just power your fridge and furnace, it can push electricity backward through your meter and onto the utility grid, energizing lines that hydro crews believe are dead.
Mercanti Electric installs residential generator connections across Hamilton and the surrounding area, from interlock kits for portable generators to fully automatic standby systems, all pulled under proper ESA permit and inspected to the Ontario Electrical Safety Code. Joseph Mercanti brings 13 years of electrical experience and full ESA/ECRA licensing (#7017086) to every installation, so you get a system that works when you need it and holds up to inspection.
Portable and standby generators require different equipment and different scopes of work. We assess what you actually have, or plan to buy, before recommending a connection method, rather than defaulting to the most expensive option.
This is the part of generator safety that isn’t obvious until someone explains it, and it’s the reason Ontario law treats generator connections as regulated electrical work rather than a DIY project. When a generator is connected directly to your home’s wiring without a transfer switch, running electricity can flow backward through your electrical panel, out through your meter, and onto the utility distribution line, a phenomenon called backfeed. Utility crews working to restore power during an outage assume those lines are de-energized. A backfed generator can re-energize a line a lineworker believes is safe, with fatal consequences, even if that worker is a considerable distance away on the same circuit.
This is why the Ontario Electrical Safety Code prohibits connecting a generator to household wiring without an approved transfer device, and why what’s sometimes called the “dryer outlet trick,” plugging a generator into a dryer outlet with a double-male cord to backfeed the panel, is illegal, dangerous, and something no licensed electrician will do or recommend. It also typically voids home insurance coverage if something goes wrong. A transfer switch or interlock kit physically prevents your home from being connected to both the generator and the utility grid at the same time, so there’s no path for backfeed to occur, whether the switch is operated manually or automatically.
The Electrical Safety Authority has been direct about this since at least the 2013 Southern Ontario ice storm, when widespread outages led some homeowners to attempt unsafe generator workarounds, prompting ESA guidance that portable generators can only be used without a transfer device if there is no possibility of backfeed to utility lines, meaning the generator is only ever plugged directly into appliances with cords, never connected to house wiring.
Not every home needs the same equipment. The right choice depends on your generator type, budget, and how much of your home you want powered during an outage.
Interlock kit
A mechanical device on the panel that physically prevents the main breaker and generator breaker from being on at the same time
Portable generators, budget-conscious installs
Manual
Manual transfer switch
A dedicated sub-panel with switches you operate to select which circuits draw from the generator
Portable generators powering select circuits
Manual
Meter-mounted transfer device
Plugs into your home’s meter base and transfers power between utility and generator at that point
Portable generators, simpler retrofit
Manual or semi-automatic depending on model
Automatic transfer switch (ATS)
Detects a power failure and switches your home from utility to generator automatically, without anyone home
Standby generators, whole-home backup
Automatic
Interlock kits and manual transfer switches cost less and work well if you’re comfortable manually starting the generator and flipping a switch during an outage. Automatic transfer switches are the standard for permanently installed standby generators, since they detect the outage and start the generator within seconds, whether or not anyone is home. All four require an ESA permit and installation by a licensed electrical contractor, none of them are homeowner-installable under the code.
Meter-mounted transfer devices, sometimes sold under brand names like GenerLink, plug directly into your home’s meter base and let a portable generator feed the panel without a separate transfer switch installed inside the house. These are a legitimate, ESA-recognized option, but not every device on the market meets Ontario’s requirements. ESA guidance is specific: for a meter-mounted transfer device to meet the Ontario Electrical Safety Code, it needs either a field evaluation by a recognized inspection body or certification to the Canadian UL1008M standard, and it can only be used if the local electrical utility has pre-approved that type of equipment for use in its service territory.
This matters because ESA has flagged an increase in transfer switches entering the Canadian market that are rated as service equipment for the United States but don’t meet Canadian requirements, since the two countries have different standards for service entrance equipment. A device that looks similar to an approved one isn’t necessarily legal to install here. We confirm equipment is properly certified and approved by your utility before installation, so you’re not left with a device that fails inspection or gets flagged later.
We review your panel, discuss which circuits or appliances you need powered during an outage, and calculate the load your generator needs to support.
Based on your generator type and goals, whether that’s a portable unit for critical circuits or a standby system for the whole home, we recommend the right transfer equipment.
We pull the required ESA electrical permit before any work begins.
We install the transfer switch, interlock kit, or meter-mounted device, along with any panel modifications and dedicated wiring required.
We test the transfer function to confirm the system switches correctly between utility and generator power with no possibility of backfeed.
ESA inspects the completed work, and we provide you with the resulting documentation for your records and your insurer if needed.
A poor generator installation is often invisible until the moment you actually need it, which is the worst possible time to find out. Warning signs include an electrician who skips the ESA permit entirely, a transfer switch installed without testing the actual transfer function, or a “connection” that turns out to be an interlock kit installed incorrectly so the main and generator breakers can still be engaged together. Watch for vague answers about backfeed protection, since any licensed electrician should be able to explain clearly how their installation prevents it. A proper job comes with a written scope, a pulled permit, a completed ESA inspection, and documentation confirming the transfer mechanism was tested under load, not just installed and assumed to work.
Mercanti Electric provides generator connection services throughout:
Get the generator installation Hamilton trusts, permitted, inspected, and installed by a licensed electrician.
No. Connecting a generator directly to household wiring without an approved transfer device is prohibited under the Ontario Electrical Safety Code and creates a serious backfeed risk to utility workers. A portable generator can only be used without a transfer device when it’s plugged directly into appliances with cords, never connected to your home’s wiring.
Yes. Any connection of a generator to your home’s electrical panel, whether through an interlock kit, transfer switch, or meter-mounted device, requires an ESA electrical permit, and only a licensed electrical contractor can pull it.
An interlock kit is a mechanical device on your existing panel that physically prevents the main and generator breakers from being on at once. A transfer switch is a separate switching mechanism, manual or automatic, that selects which circuits draw power from the generator versus the utility.
Yes. Plugging a generator into a dryer outlet to backfeed your panel is illegal, bypasses all backfeed protection, and can energize utility lines that lineworkers believe are safe. It also typically voids home insurance.
Yes. ATS installation involves work inside and adjacent to your main panel and is regulated electrical work under the Ontario Electrical Safety Code, requiring a licensed electrical contractor and an ESA permit.
Yes, but only when the specific device is certified to Canadian requirements and pre-approved by your local utility, and only when installed by a licensed electrical contractor under an ESA permit. Not every device sold for this purpose meets Ontario’s standards.
It depends on which circuits or appliances you want powered during an outage. We calculate this as part of the assessment, based on whether you want whole-home backup or coverage for specific critical loads.
