If your Aiken home was built between 1965 and 1973, there is a significant chance it contains aluminum branch circuit wiring. During that eight-year window, approximately two million homes across the United States were wired with aluminum instead of copper for their 15-amp and 20-amp circuits. The reason was simple economics: copper prices spiked dramatically during that period, and aluminum was cheaper and readily available. Builders and electricians made the switch without fully understanding the long-term consequences.
Decades later, we now know that aluminum wiring in branch circuits presents serious fire risks. The Consumer Product Safety Commission (CPSC) has determined that homes with aluminum wiring are 55 times more likely to have one or more wire connections reach fire-hazard conditions than homes wired with copper. That statistic alone should get the attention of any Aiken homeowner who suspects their house may contain aluminum wiring.
Here is a detailed look at why aluminum wiring is dangerous, how to identify it, and what your options are for making your home safe.
A Brief History of Aluminum Wiring in Residential Construction
Aluminum has been used safely in electrical applications for over a century. Utility companies have used aluminum conductors for power transmission lines for decades, and it remains the standard for that application today. The problem arose specifically when aluminum was used for the smaller branch circuits inside homes, the 15-amp and 20-amp circuits that power your outlets, switches, and light fixtures.
During the mid-1960s, copper prices climbed steeply due to global demand and supply disruptions. Builders needed an alternative, and aluminum seemed like a logical choice. It was lightweight, conductive, and far less expensive. The National Electrical Code at the time permitted its use, and so aluminum wiring became standard in many new homes built between approximately 1965 and 1973.
By the early 1970s, reports of problems began surfacing. Overheated connections, melted insulation, and house fires were being traced back to aluminum wiring connections. In 1971, the NEC began revising its requirements for aluminum wiring, and by the mid-1970s, the use of single-strand aluminum for branch circuits had essentially stopped. But the roughly two million homes already wired with aluminum remained, and many of them, including homes right here in Aiken and the surrounding CSRA, still have that original wiring in place today.
Why Aluminum Wiring Is Dangerous
Aluminum is a perfectly functional conductor of electricity. The problems with aluminum wiring are not about its ability to carry current through a straight run of wire. The dangers arise at connection points, where aluminum wire meets outlets, switches, circuit breakers, and junction boxes. There are several specific properties of aluminum that make these connections hazardous over time.
Oxidation. When aluminum is exposed to air, it forms a layer of aluminum oxide on its surface. Unlike copper oxide, which is still reasonably conductive, aluminum oxide is a poor conductor. This oxidation layer builds up at connection points and creates resistance. Increased resistance generates heat. Heat at an electrical connection is precisely how fires start inside walls.
Thermal expansion and contraction. Aluminum expands and contracts with temperature changes at a significantly higher rate than copper. Every time a circuit carries current, the wire heats up slightly. When the current stops, it cools. Over thousands of heating and cooling cycles, aluminum connections gradually loosen. A loose connection creates arcing, which generates intense localized heat and can ignite surrounding materials like wood framing, insulation, or the plastic components of outlets and switches.
Galvanic corrosion. When aluminum comes into direct contact with copper or brass, which are the materials used in most outlets, switches, and connectors, a galvanic reaction occurs in the presence of moisture. This electrochemical reaction accelerates corrosion at the connection point, further increasing resistance and the risk of overheating.
Softness and creep. Aluminum is a softer metal than copper. When a screw terminal is tightened onto aluminum wire, the aluminum slowly deforms under the constant pressure, a phenomenon known as cold flow or creep. Over time, this deformation loosens the connection, even if it was properly tightened during installation. Loose connections, again, are the primary mechanism through which aluminum wiring causes fires.
The cumulative effect of these four properties means that every connection point in an aluminum-wired home is a potential failure point. An average home has dozens of these connections: at every outlet, every switch, every light fixture, and every junction box. Each one is slowly degrading over time.
How to Identify Aluminum Wiring in Your Home
There are several ways to determine whether your Aiken home has aluminum wiring. The easiest checks you can do yourself, but a definitive assessment should come from a licensed electrician.
Check the age of your home. If your home was built between 1965 and 1973, it is in the primary window for aluminum wiring installation. Homes built slightly before or after that range may also have some aluminum circuits, particularly if additions or renovations were done during that period.
Look at exposed wiring. In your attic, basement, crawl space, or garage, you may be able to see exposed electrical cables. Aluminum wiring cables are typically marked with the word "ALUMINUM" or the abbreviation "AL" printed on the outer jacket. The jacket itself is often silver or gray in color, though this alone is not a reliable indicator since some copper wiring also uses gray jacketing.
Check your electrical panel. If you can safely look at the wires entering your breaker panel without removing the cover, aluminum wiring will appear silver or dull gray, in contrast to the bright orange color of copper. However, do not remove the panel cover yourself, as the interior carries live voltage.
Look at outlets and switches. With the power off, you can remove the cover plate from an outlet or switch and look at the wires connected to the device. Aluminum wire will be silver-colored, while copper is distinctly orange or brown. Many outlets and switches from that era will also have markings indicating whether they are rated for aluminum connections. Devices marked "CO/ALR" are rated for aluminum; devices marked only "CU" or with no marking are designed only for copper.
Get a professional inspection. The most reliable way to determine the extent of aluminum wiring in your home is to have a licensed electrician conduct a thorough inspection. They will check connections throughout the house, identify which circuits use aluminum, and assess the condition of existing connections.
Warning Signs of Aluminum Wiring Problems
If your home has aluminum wiring, there are several warning signs that indicate connections may already be failing. Any of these should prompt an immediate call to a licensed electrician.
Warm or hot cover plates. If the plastic cover plates on your outlets or switches feel warm to the touch, this indicates heat buildup at the connection, a clear sign of a failing connection.
Flickering lights. Lights that flicker, dim momentarily, or behave erratically can indicate a loose or corroded connection in the circuit. While flickering can have other causes, in a home with aluminum wiring, it should be investigated promptly.
Burning smell. A faint smell of hot plastic or burning near outlets, switches, or light fixtures is a serious warning. This indicates that a connection has already begun overheating to the point of damaging surrounding materials.
Sparking or arcing. Visible sparks when you plug something in, or scorch marks around outlets, indicate arcing at the connection point. This is an immediate fire hazard.
Circuits that do not work. An outlet or switch that intermittently stops working or has stopped working entirely may have a connection that has failed due to oxidation, loosening, or corrosion.
Repair Options: COPALUM Crimping vs. Complete Rewiring
If your home has aluminum wiring, there are two primary solutions that are considered safe and effective by the CPSC and electrical industry experts.
COPALUM crimp connectors. The COPALUM repair method is considered the most reliable short-of-rewiring solution by the CPSC. It involves attaching a short piece of copper wire to the end of each aluminum wire using a specially designed crimp connector and a powered crimping tool. The resulting connection, called a pigtail, creates a copper-to-copper connection at every outlet, switch, and junction point. The crimp itself creates a cold weld between the aluminum and copper that is gas-tight, preventing oxidation.
The COPALUM method requires a licensed electrician who has been specifically trained and certified to use the proprietary crimping tool. Each connection in the home must be individually pigtailed, which means the electrician must access every outlet, switch, light fixture, and junction box. For a typical three-bedroom home, this can involve 60 to 100 individual connections.
Complete rewiring. The most thorough solution is to replace all aluminum branch circuit wiring with copper. This involves running new copper wires through the walls to every outlet, switch, and fixture in the home. A complete rewire eliminates the aluminum wiring entirely, removing the ongoing risk.
A complete rewire is more expensive than COPALUM pigtailing, but it provides a permanent solution and often allows for upgrading the home's electrical system at the same time, adding circuits, upgrading the panel, and bringing everything to current NEC standards. For homes in Aiken that are also dealing with outdated panels or insufficient circuits, a rewire can address multiple issues at once.
Methods to avoid. Some electricians may suggest using standard twist-on wire nuts (such as purple wire nuts marketed for aluminum-to-copper connections) as a pigtailing method. While the CPSC acknowledges this as an acceptable repair when done correctly, it is considered less reliable than the COPALUM method because twist-on connectors can loosen over time. The CPSC explicitly warns against using standard copper-rated outlets and switches with aluminum wiring without proper pigtailing.
Insurance Implications for Aluminum-Wired Homes
Homeowners insurance is a significant concern for homes with aluminum wiring in Aiken and throughout South Carolina. Many insurance companies view aluminum wiring as a material increase in risk. Here is what you may encounter.
Some insurance companies will not write new policies for homes with known aluminum wiring. If you are purchasing a home with aluminum wiring, you may find your insurance options are limited or that premiums are significantly higher than comparable copper-wired homes.
If your current policy is up for renewal and the insurer becomes aware of aluminum wiring, through a home inspection, a claim, or a routine review, they may require remediation as a condition of continued coverage. Some insurers will accept a certified COPALUM pigtail repair; others may require a complete rewire.
When selling a home with aluminum wiring, a buyer's home inspector will almost certainly flag it. This typically results in a price negotiation, a repair requirement before closing, or both. Proactively addressing aluminum wiring before listing your home removes this obstacle and demonstrates that the property has been properly maintained.
What Aiken Homeowners Should Do
If you suspect your Aiken home has aluminum wiring, the appropriate steps are straightforward. First, have a licensed electrician inspect your home to confirm the presence of aluminum wiring and assess the condition of all connections. Second, discuss repair options, whether COPALUM pigtailing or complete rewiring, based on the age and condition of your electrical system, your budget, and your long-term plans for the home. Third, get the work done by a qualified professional who understands the specific requirements of aluminum wiring repair.
Unity Power & Light provides comprehensive aluminum wiring inspections and repairs for homes throughout Aiken, SC and the surrounding CSRA area. We can identify the extent of aluminum wiring in your home, assess the condition of your connections, and recommend the most appropriate repair solution for your situation. Every job is performed to current NEC standards and backed by our commitment to doing the work right.