An electrical panel needs connections that resist corrosion in a coastal environment. Which wire type is best suited?
Tinned copper wire
Choosing a wire for a corrosive setting is governed by protecting the metal surface: coastal air is laden with salt and moisture that attacks bare metal, so the exposed connection must both conduct well and resist that attack.
Tinned copper wire is copper given a thin, continuous coating of tin, which forms a stable protective layer that keeps salt and moisture off the copper underneath.
Because tin is corrosion-resistant yet the core stays copper, the wire keeps copper's high conductivity while gaining durability at the terminations where metal is exposed.
Aluminium wire forms a surface oxide and, in salty damp air, is prone to further corrosion and to loose, high-resistance joints, so it is a poor coastal choice.
Bare copper has no protective coat and will tarnish and corrode where it is clamped, degrading the connection over time.
PVC insulated copper protects only the covered length; at the stripped connection points the copper is still bare and exposed, so it does not solve the problem at the terminals.
Hence, the answer is Tinned copper wire.
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