Why Aluminum Wiring Is a Hidden Hazard

If your Seattle-area home was built between 1965 and 1973, there’s a good chance it contains single-strand aluminum branch wiring – a system once embraced for its low cost, but now well-known for its safety risks.

Whether you’re experiencing flickering lights or simply want to protect your home and family, here’s what you need to know about aluminum wiring.

The Problem with Aluminum Wiring

Back in the late ’60s and early ’70s, the cost of copper surged, and aluminum became a popular substitute for branch wiring (the wiring that feeds outlets, lights, and switches). But aluminum wiring behaves very differently than copper.

⚠️ Here’s why aluminum wiring is hazardous:

These factors can lead to overheating, arcing, and even electrical fires, all without any visible signs.

• It expands and contracts more than copper, which can loosen connections at terminals over time.
• It’s more prone to oxidation (rusting), which increases resistance and heat at connection points.
• It’s softer and more brittle, making it easier to nick, crush, or break, especially when moved or disturbed.
• It’s incompatible with many devices designed for copper, unless special connectors or devices are used.

What Does the Data Say?

According to the U.S. Consumer Product Safety Commission (CPSC), homes with aluminum wiring are 55 times more likely to have connections that reach “fire hazard conditions” than those with copper wiring.

Warning Signs of Aluminum Wiring Problems

If your home has aluminum branch wiring, here are the red flags to watch for:

• Lights that flicker or dim unpredictably
• Warm or discolored wall plates
• Buzzing sounds from outlets or switches
• Acrid, burning plastic smell with no clear source
• Frequent breaker trips
• Wires marked with “AL,” “ALUM,” or “ALUMINUM” in the panel

What Are the Solutions?

At Exact Electric, we follow best practices backed by the CPSC and NEC (National Electrical Code) when addressing aluminum wiring in Seattle-area homes. There are two main remediation paths:

Full Rewire (Permanent Fix)

The gold standard. This means completely replacing the aluminum branch circuits with modern copper wiring.

Best for homeowners who:

• Plan to stay in the home long-term
• Want to increase resale value
• Are already remodeling or upgrading electrical systems. This is a good time to add new circuits, EV charging outlets, or energy-efficient upgrades.

COPALUM or AlumiConn Connectors (Temporary Mitigation)

In certain cases, we can use code-compliant aluminum-to-copper connectors at termination points. While this doesn’t eliminate the aluminum wiring entirely, it reduces the fire risk. This is often used when a full rewire isn’t possible right away.

We’ll always help you weigh your options based on budget, home layout, and long-term goals.

Our Process at Exact Electric

We make electrical upgrades easy:

• In-depth home inspection a
• Clear, transparent estimate
• Customized solution
• Efficient, respectful work

Whether you’re a new homeowner, planning a remodel, or just want peace of mind – now is the time to deal with aluminum wiring safely and professionally.

For more information contact us!

We serve Seattle, Shoreline, Edmonds, Tukwila, Bellevue and the entire Greater Puget Sound region and we’re here to make your home safer and more efficient.