Fuse panel: why it has to go

Fuse and breaker: the real difference

First, a common belief needs taking apart: a fuse isn’t an outdated or dangerous device. A fuse of the right rating cuts the circuit on an overload exactly as a breaker would, and it even does it a little faster.

The problem with a fuse box is elsewhere, and it’s very real.

The row that matters is the second to last. A breaker isn’t better because it protects better: it’s better because it’s much harder to defeat.

The real problem

Here is how it goes, in almost every home concerned.

A fuse blows. It’s annoying, you have to go down to the basement, and you need a spare. It blows again the next week. Someone (a helpful relative, a previous owner) ends up screwing in a fuse of a higher rating. And it stops blowing.

The problem hasn’t been fixed. It has been made invisible.

The fuse wasn’t protecting the appliance: it was protecting the wire in the wall. A wire rated for 15 amps protected by a 20 or 30 amp fuse is a wire that can now heat up, inside a wall, with nothing to cut it. That’s the heart of what is feared in a fuse box, and it’s invisible until you open it.

The capacity question

Beyond the fuses themselves, there is the age of the installation. A fuse box dates from a time when a house had a few circuits, and it very often comes with a 60 amp service.

The result: even with every fuse replaced by the right rating, the installation still can’t handle what is asked of it today. That’s the subject of our guide on the 60 amp panel (in French).

And there is the lack of space: a fuse box has no free slot for the circuit of the EV charger, the hot tub or the heat pump you are considering. The conversation almost always starts with one of these projects.

Pre-purchase inspection and sale

A fuse box is always noted in a pre-purchase inspection. The inspector won’t say it’s dangerous: they will note an older type of panel, check the ratings if they can, and recommend an assessment by a master electrician.

That flag then becomes leverage in the negotiation, and the seller discovers it at the worst moment.

On the insurers’ side, the presence of fuses is among the things several of them ask about, often more than the amperage. Each insurer has its own rules, and the question is theirs to answer. What we provide is the work report they will ask for.

The replacement

You don’t “change the fuses for breakers” in an existing box: you replace the panel. And on a house of that age, the service entrance very often follows: the mast, the meter base and the supply cable were sized for the old capacity.

The job includes the panel, connecting all the existing circuits, the municipal permit, coordinating the disconnection and reconnection with Hydro-Québec, and the final inspection. The electrician handles the permit and the calls.

At STM-Électrique, on a single-family home: replacing the panel alone runs about $1,850, and going to 200 amps with the service entrance redone about $2,900. These are ballpark figures: the distance between the meter and the panel, the number of circuits and the condition of the wiring change the bill, and the exact price is written in the quote.

As for time: half a day to a full day without power in most cases. The details are in our guide replacing an electrical panel.

Frequently asked questions