Requests reaching Panel Upgrade Sudbury about aluminum wiring almost always arrive attached to something else — an insurance questionnaire that asked two questions, or a panel quote where the electrician noticed the conductors. That's fitting, because the smart fix is attached to something else too.
Why aluminum branch wiring gets flagged
For about a decade — roughly 1965 to 1976, when copper prices spiked — Canadian builders ran aluminum for ordinary 15- and 20-amp branch circuits. Aluminum conductors behave differently at connection points: the metal expands and contracts more with heat, flows slowly under screw-terminal pressure, and oxidizes. Over decades, connections at outlets, switches and fixtures can loosen and resist current — and a resistive connection under load is a heat source inside a wall box. Inspection references document overheated devices and scorched terminations as the characteristic failure.
Insurers respond the way they do to the panels: questionnaires ask about wiring type, and aluminum answers draw surcharges, inspection requirements, or conditions. Many carriers accept aluminum wiring if a licensed contractor has remediated the connections and an ESA inspection backs it up — which is a milder demand than the panel refusals, but a demand all the same.
The fix is at the connections, not in the walls
The aluminum conductors themselves, sized and run properly, aren't the crisis — the terminations are. The standard remediation is copper pigtailing: at every outlet, switch and fixture on an aluminum circuit, a short copper lead is joined to the aluminum with a CSA-approved connector rated for the purpose, and the copper — not the aluminum — lands on the device. The panel connections get the same treatment. No drywall comes down; it's methodical device-by-device work.
| Scope | Typical cost |
|---|---|
| Whole-house pigtailing, typical Sudbury bungalow or side-split | usually under $3,000 |
| Bundled with a panel replacement | quoted together — one visit, shared setup |
The bundle line matters. A 1968 New Sudbury house with aluminum branch circuits has decent odds of a flagged panel too, and the same is true in reverse — so partner contractors quote them together whenever the era suggests it. If you're already pricing a swap, the cost page shows how the add-on stacks; if you're starting from an insurance letter that mentioned both, start with the insurance decoder.