If your home was built between the mid-1960s and mid-1970s, there’s a good chance it contains aluminum electrical wiring. While aluminum wiring isn’t inherently dangerous, its connection points and long-term reliability raise serious safety concerns. Left unchecked, faulty aluminum wire connections can lead to overheating, sparking, and even electrical fires.
So how do you know if it is safe — and when should you consider rewiring your aluminum wiring?
Why Aluminum Wiring Can Be Problematic
Aluminum is softer and more reactive than copper. The biggest issue isn’t the wire itself — it’s how it connects to outlets, switches, and other components. Over time, aluminum wiring tends to:
- Oxidize (form a coating when exposed to air), reducing conductivity
- Expand and contract with temperature changes, loosening connections
- React chemically with copper when mixed without proper connectors
These conditions can create hot spots, increase resistance, and pose a fire hazard, especially at switches and receptacles.
Why Aluminum Wiring Is No Longer Used In Homes
Aluminum was popular due to its low cost and availability during copper shortages, but it fell out of favour because of:
- High rates of connection failure
- Frequent overheating due to oxidation
- Softness that made it more prone to breakage during installation
- Its exclusion from modern codes — the Canadian Electrical Code no longer permits aluminum wiring smaller than #6 gauge for residential use
Is Aluminum Wiring Safe?
Aluminum wiring can be safe if properly maintained and handled with care. Issues typically arise during renovations or when replacing switches and outlets without the correct components.
To reduce risk, you must:
- Use CO/ALR-rated devices designed for aluminum wiring
- Avoid overtightening or stressing the wire
- Schedule routine inspections by a licensed electrician
Signs You Have Problematic Aluminum Wiring
If you notice any of the following signs, it’s time to have your aluminum wiring checked:
- Flickering lights, even after changing bulbs
- Warm outlets, switches, or cover plates
- Buzzing sounds or occasional sparking
- Burning smells or discoloration near receptacles
These could be early warnings of loose or failing connections and should be addressed immediately by a professional electrician.
How to Maintain Aluminum Wiring Safely
Even if your wiring looks fine on the surface, connection fatigue from expansion and contraction continues over time. Here’s how to stay safe:
- Have a licensed electrician perform regular inspections
- Never attempt DIY fixes — aluminum wiring is more delicate and prone to failure than copper
Should I Replace Aluminum Wiring with Copper?
In many cases, yes — especially if:
- You’re doing a major renovation
- Your switches or receptacles need updating
- You’re having trouble securing home insurance (many insurers require copper)
While full rewiring can be a significant investment, it dramatically improves home safety and long-term reliability.
What Is Pig-Tailing — and Is It a Safe Less Expensive Alternative?
If your aluminum wiring is in good condition, you may be able to avoid a full replacement by using a method called “pig-tailing.”
Pig-tailing involves connecting short pieces of copper wire to your aluminum wiring using specialized connectors. This allows you to use standard modern outlets and switches safely. However, pig-tailing must be done by a licensed electrician, as aluminum is fragile and requires expert handling.
Aluminum Wiring FAQs
Is aluminum wiring legal in Alberta?
Yes, but only if installed correctly using approved methods. Most modern devices are not compatible, and updates must meet CEC standards.
Can I get home insurance with aluminum wiring in Alberta?
Possibly, but many insurers require a safety inspection or documented upgrades (like pig-tailing).
Does aluminum wiring affect resale value?
It can. Homes with documented copper upgrades or pig-tailing often have fewer roadblocks during inspection and sale.
Final Thoughts: Aluminum Wiring Isn’t a DIY Project
Whether seeing signs of trouble or simply planning a renovation, treating aluminum wiring carefully is essential. A professional inspection can help you understand your options — from safe maintenance to partial or complete rewiring. At Kreistrom, we specialize in aluminum wiring inspection, upgrades, and pig-tailing services to ensure your home stays safe and code-compliant. Contact us today for a free quote or to book an in-home evaluation.
