Aluminum branch wiring
Aluminum branch wiring that oxidises and loosens at connections, carrying a much higher fire-hazard risk than copper.
Widespread during the mid-1960s copper shortage; use ended in the late 1970s over fire-safety concerns.
What it means for you: Insurers frequently charge 15–30% more or require remediation (pigtailing) and an ESA safety certificate.
Check: ESA Certificate of Acceptance and evidence of pigtailing or rewiring.
