Is aluminum wiring in my 1970s house dangerous?

Yes, aluminum wiring from the 1970s poses significant fire and safety risks and should be addressed by a licensed electrician. While not immediately dangerous if undisturbed, aluminum wiring has caused numerous house fires due to its tendency to overheat at connection points.

Why Aluminum Wiring is Problematic

Aluminum wiring was widely used in Canadian homes from 1965-1975 as a cheaper alternative to copper. However, aluminum has several dangerous characteristics that weren't fully understood at the time. It expands and contracts more than copper when heated, causing connections to loosen over time. Aluminum also oxidizes when exposed to air, creating a resistive coating that generates heat. Most problematically, aluminum is incompatible with standard electrical devices designed for copper wiring, leading to arcing and overheating at outlets, switches, and junction boxes.

The Consumer Product Safety Commission identified aluminum wiring as a fire hazard, finding homes with aluminum wiring are 55 times more likely to have electrical fires than those with copper wiring. In Ontario, many insurance companies now require disclosure of aluminum wiring and may charge higher premiums or refuse coverage entirely.

Signs Your Aluminum Wiring May Be Failing

Watch for warning signs including warm or hot outlet covers, flickering lights, burning smells near electrical devices, outlets or switches that don't work intermittently, and scorch marks around outlets or panel connections. If you notice any of these symptoms, shut off the affected circuit immediately and call a licensed electrician - these are signs of dangerous overheating that could cause a fire.

Solutions for Aluminum Wiring in Ottawa

The Ontario Electrical Safety Code requires specific methods for dealing with aluminum wiring. Complete rewiring with copper is the gold standard solution, typically costing $8,000-$15,000 for a 1,500 square foot home. However, there are approved repair methods that are more affordable. COPALUM crimp connectors can safely join aluminum wire to copper pigtails at each device, costing $150-$300 per outlet or switch. AlumiConn wire nuts are another ESA-approved method for specific applications.

ESA Permit Requirements

Any aluminum wiring remediation work requires an ESA permit and inspection. Only licensed electricians can perform this work legally in Ontario. The electrician will assess your specific situation, determine the best repair method, and ensure all work meets current code requirements. Insurance companies typically require documentation that aluminum wiring has been professionally addressed.

Immediate Safety Steps

While planning your aluminum wiring solution, avoid overloading circuits, don't use extension cords as permanent solutions, and have any warm outlets or switches inspected immediately. Never attempt DIY repairs on aluminum wiring - improper connections are extremely dangerous and will void your insurance coverage.

For a comprehensive assessment of your aluminum wiring and ESA-compliant repair options, Electrical Ottawa's licensed electricians can provide a detailed evaluation and quote for bringing your 1970s home up to current safety standards.

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Find a Licensed Electrician

Electrical Ottawa connects you with vetted, ESA-licensed electricians from the Ottawa Construction Network:Ottawa Electrical Contractors:

• LB Electric
• Ottawa Electric
• Marcel Electric