Copper vs aluminum — same ampacity, about two sizes larger
Same 200 A, but aluminum runs ~2 sizes larger (2/0 Cu vs 4/0 Al) — for ~61% conductivity, ~half the weight, and roughly a third to half the cost.
What this diagram shows
Two conductor cross-sections carry the same 200 A service: 2/0 copper on the left is smaller, 4/0 aluminum on the right is visibly larger — about two AWG sizes up. A trade-off strip shows aluminum has about 61% of copper conductivity but roughly half the weight and one-third to one-half the cost.
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