Is the aluminum wiring in my 1970s home in Fredericton dangerous?

Aluminum wiring itself isn't inherently dangerous, but the connections where aluminum meets copper or connects to devices are a significant fire risk — and many 1970s homes in Fredericton and across New Brunswick were wired with aluminum branch circuit wiring during a period when copper prices were extremely high.

The core problem is that aluminum expands and contracts more than copper when it heats up during use. Over decades of thermal cycling, the connections at outlets, switches, light fixtures, and the panel loosen. Loose connections create resistance, resistance creates heat, and heat creates fires. According to the Consumer Product Safety Commission, homes with aluminum wiring are 55 times more likely to have fire-hazard conditions at outlets and switches compared to copper-wired homes.

How to tell if you have aluminum wiring. Look at the wiring entering your electrical panel — aluminum wire has a silver colour compared to copper's distinctive orange-brown. You can also check the wire jacket printed text, which will say "AL" or "ALUMINUM" if it's aluminum. Many Fredericton homes built between 1965 and 1978 used aluminum for 15 and 20 amp branch circuits. The main service entrance cable being aluminum is normal and not a concern — it's the branch circuit wiring (the smaller wires going to outlets and switches) that's the issue.

Your options for remediation. The gold standard is a complete rewire to copper, which costs $8,000 to $15,000+ for a typical 1,500 square foot Fredericton home. However, a more cost-effective approach that's accepted by TSANB is COPALUM crimping or AlumiConn connectors — these are special connectors that create a safe, permanent transition from aluminum to copper at every connection point. Pigtailing with AlumiConn connectors typically costs $3,500 to $6,000 for a whole house, depending on the number of connections.

Insurance implications are real in New Brunswick. Many insurance companies will either refuse to insure a home with unremediated aluminum wiring or charge significantly higher premiums. If you're buying or selling a home in Fredericton with aluminum wiring, expect this to come up during the home inspection. Having the aluminum wiring professionally remediated with a TSANB inspection certificate can actually increase your home's value and make it far easier to insure.

Do not attempt DIY aluminum wiring repairs. The connections require specific listed connectors and techniques — standard wire nuts are not rated for aluminum-to-copper connections and can make the fire hazard worse. A licensed electrician experienced with aluminum wiring remediation is essential for this work.

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