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What is aluminum wiring?

Aluminum wiring is electrical cable that carries current through aluminum conductors rather than copper. In homes, small branch circuits installed from 1965 through the mid-1970s may contain it. CPSC locates the fire hazard at connections, so identification should lead to an electrician’s repair-scope assessment.

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By InstaBids editorial team with AI research agents. Updated

What this means for your home project

  1. Read the printed or embossed jacket markings on cables already visible in an unfinished basement, attic or garage to begin identifying the wiring. Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04.
  2. If the visible marking includes “CU-clad” or “Copper-clad,” record that distinction: CPSC’s repair recommendations here exclude copper-coated aluminum cable. Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04.
  3. Leave the panelboard and circuit-breaker compartment closed; opening the interior can expose live wires and cause electrocution. Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04.
  4. Request a written connection-repair scope listing outlets, dimmers, switches, fixtures, appliances and junction boxes, with every aluminum connection or splice included. Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04.
  5. Ask how wiring modifications will be performed and inspected under local regulations; include that inspection arrangement in the scope. Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04.
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How can I tell if I have aluminum wiring without opening anything?

Start with cable-jacket lettering visible in unfinished areas, and leave panel interiors closed because their live wiring presents a shock hazard. “Cable with aluminum conductors will have “Al” or “Aluminum” and other information marked on one side of the cable jacket every few feet along its length.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “(Note: be sure to read as much of the marking as possible because the marking “CU-clad” or “Copper-clad,” in addition to the “Al” or “Aluminum,” means that the cable uses copper-coated aluminum wire and is not covered by the repair recommendations outlined in this publication).” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “CPSC advises that consumers should not open the interior of the panelboard or circuit breaker compartment - this can expose live wires and pose an electrocution hazard.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04.

What are the warning signs of an aluminum branch-circuit wiring problem?

Treat new electrical symptoms as a reason to call an electrician, while remembering that silence cannot establish the condition of concealed connections. “Signs of electrical system problems include hot-to-the touch face plates on receptacles or switches; flickering lights; circuits that don’t work; or the smell of burning plastic at outlets or switches.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “Aluminum-wired connections and splices have been reported to fail and overheat without any prior indications or problems.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “If you notice any signs of a problem, have a qualified electrician determine the cause.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04.

Should I repair or replace aluminum wiring?

Repair can retain existing cable through copper extensions at its ends, whereas replacement installs copper circuits; CPSC’s June 2011 booklet describes both approaches. “Replacement of the aluminum branch circuit conductors with copper wire eliminates the primary cause of the potential hazards, the aluminum wire itself.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “As an alternate to rewiring with copper, CPSC recommends attaching a short section of copper wire to the ends of the aluminum wire at connection points (a technique commonly referred to as “pigtailing”), using a special connector named COPALUM to join the wires.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “Based upon an evaluation that was, in part, CPSC supported, consumers are advised that, if the COPALUM repair is not available, the AlumiConn connector may be considered the next best alternative for a permanent repair.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “This repair method involves pigtailing using a setscrew type connector instead of the COPALUM crimp connector in the repaired connections.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04.

How much of the house does a pigtail repair actually cover?

A connection-repair scope needs to reach wired equipment as well as ordinary receptacles; ask the electrician to list each affected connection category. “The repair should include every connection or splice involving aluminum wire in the home, including outlets, dimmers, switches, fixtures, appliances, and junction boxes.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “All appliances connected directly to No.12 or No.10 AWG aluminum branch circuit wiring (e.g., dishwashers, cooling equipment, heaters, air conditioners, and light fixtures) must be repaired in addition to wall outlets, switches, junction boxes, and panel boxes.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “The repairs outlined in this publication do not apply to larger gauge aluminum wire circuits and connections used for service entrance cables, electric clothes dryers, and cooking ranges.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04.

What drives the cost of aluminum wiring remediation?

The layout of your home and access through unfinished areas affect rewiring difficulty, so compare replacement and connection repair as separate scopes. “Depending on the architectural style of your home and the number and locations of unfinished spaces (e.g., basements and attics), it may be relatively easy for a qualified electrician to rewire your home.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “A new copper wire branch circuit system would be installed, and the existing aluminum wire could be abandoned inside the walls.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04. “The COPALUM repair method has been shown to be practical for installation in an occupied and furnished home.” Source: U.S. Consumer Product Safety Commission (CPSC), read 2026-11-04.

Does a general home inspection settle whether I have aluminum branch wiring?

A general inspection can leave concealed conditions unresolved: North Carolina’s suggested report language distinguishes visible findings from the overall electrical system’s condition. “Due to the concealed nature of the electrical components, the general condition of the system could not be determined during the home inspection.” Source: North Carolina Home Inspector Licensure Board, read 2026-11-04.

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