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Aluminum solid wiring is a bastard to deal with. There was an apartment complex not to far from where I live that caught on fire, the insurance company tried tooth and nail to deny coverage because the aluminum wiring had an improper splice, and they determined the splice was the start of the fire where the copper and aluminum meet. What saved his ass was he had detailed down to the finest details the maintenance records since he bought it, and shown all his repairs were in compliance meaning the previous owner was the one cutting corners.
The aluminum wiring gets loose connections but seeing copper wire does not mean it is all copper. The copper to alumin splice is safe and accepted if done properly but many never did a proper one and went the cheap route to kick the can down the road, meaning the fire will start at the splice instead of the outlet. Copper with a loose connection can do the same however copper simply tends to hold steady over the years while solid aluminum resonates causing loose connections needing a special splice to ensure no future problems.
Aluminum wiring and copper to aluminum connections both have unique problems. Aluminum is not as good of a conductor as copper, which is why aluminum wiring is generally 1 size larger than the same copper circuit. Aluminum also responds to heat and moisture differently than copper, creating unique termination requirements.
Basically, if you have aluminum, then make sure your connection point is specifically rated for aluminum. This was not always the case (houses built in the 70's are notorious for not having properly rated connections). Your termination/connection point will have AL stamped on it (or AL/CU meaning it is dual rated).
Aluminum also requires an anti-oxidant compound to be used at the termination due to aluminum's susceptibility to corrosion. The more humid your environment the more important this is.
Finally, if you are actually connecting aluminum to copper, say in a splice, there are very few (and relatively expensive) rated connectors for this. Hire a professional with experience for this type of work.
There are a lot of people and contractors who try to work around these requirements due to cost - insurance and safety are good reasons to not go cheap when making repairs to aluminum wiring.