What Is Aluminum Wiring, and Should You Be Concerned?

If your home was built or remodeled between the mid-1960s and 1970s, there’s a chance it contains aluminum wiring. While it was once considered a cost-effective alternative to copper, aluminum has since gained a reputation for being a potential fire hazard. But is it always dangerous? And what should homeowners do about it?

Why Was Aluminum Wiring Used?

In the 60s and 70s, the price of copper skyrocketed, prompting builders to switch to aluminum, which was cheaper and more readily available.

At the time, aluminum was thought to be a suitable substitute — but experience and time revealed some serious drawbacks.

The Problem with Aluminum Wiring

Aluminum expands and contracts more than copper. Over time, this movement loosens connections, especially where the wire is attached to outlets, switches, or breakers.

🧯 The result:

• Loose connections
• Overheating
• Arcing
• Increased fire risk

Additionally, aluminum oxidizes more easily than copper. This corrosion increases resistance, leading to heat buildup.

Warning Signs You Might Have Aluminum Wiring

⚠️ Flickering lights
⚠️ Outlets that are warm to the touch
⚠️ Frequent tripped breakers
⚠️ Burning smells or discolored outlets
⚠️ “CO/ALR” or “AL” markings on outlets or wires

📅 Homes built between 1965–1975 are most likely to have aluminum wiring.

Is It Illegal or Out of Code?

Aluminum wiring isn’t banned, but many insurance companies won’t cover homes that have it unless it’s been properly repaired or replaced. The National Electrical Code (NEC) allows aluminum, but only when used safely with compatible devices.

What Are the Solutions?

1. Full Rewire (Best, but Expensive):
   Replace aluminum with copper wiring throughout the home.
2. COPALUM Crimping (Safe Alternative):
   Special connectors installed by certified electricians that permanently join aluminum to copper at each connection point.
3. AlumiConn Connectors:
   A more affordable option approved by the Consumer Product Safety Commission.
4. Upgraded Outlets & Switches:
   Use CO/ALR-rated devices designed to safely accept aluminum wires.

💡 Do not DIY this fix — aluminum requires precise tools and experience to ensure long-term safety.

Final Thought: Don’t Panic, But Don’t Ignore It

If you suspect your home has aluminum wiring, it doesn’t mean you’re in immediate danger — but you should take it seriously. A licensed electrician can inspect your system and recommend the safest course of action for your home and your family.