An inspector cannot determine whether an older home's wiring is aluminum or copper-clad aluminum from visible portions. The report should:

Aluminum branch wiring and copper-clad aluminum carry very different risk profiles, and the distinction cannot reliably be made from the short lengths of conductor visible at a panel. Copper-clad aluminum has a copper skin over an aluminum core; at a cut end the core shows, but conductors in service are rarely cut cleanly where an inspector can see them, and insulation markings may be illegible, painted over or absent on older cable. Guessing is not a neutral act here: calling solid aluminum copper-clad would understate a recognized fire risk, and calling copper-clad solid aluminum would send the client into an expensive remediation they may not need. The correct treatment is to describe exactly what was observed, state plainly that the type could not be determined from the accessible portions, and refer the determination to an electrician who can open devices and examine conductors properly.

The report describes what was actually observed and states that the conductor type could not be determined from the visible portions, then recommends evaluation by an electrician who can access and identify the conductors. That is accurate and actionable without asserting an unsupported conclusion.

Solid aluminum branch-circuit wiring used in some mid-century construction is associated with connection failures and fire risk, and remediation methods are specific. Copper-clad aluminum behaves differently. Distinguishing them typically requires examining conductors at devices, beyond a visual panel inspection.

Name the Unknown. Saying 'I could not determine this' is a finding, not a failure — and it is the only honest answer when guessing has consequences in both directions.

Pair the referral with the reason: what you saw, what you could not see, and why it matters. That framing is what makes the recommendation useful to the electrician.

• •Inferring wiring type from the construction year
• •Defaulting to the reassuring answer under uncertainty
• •Leaving an unresolved question out of the report entirely