Under standard National Electrical Code guidelines and utility engineering specifications, the minimum wire size permitted for an overhead residential service drop is traditionally #8 copper or #6 aluminum conductor for small accessory services, though modern residential installations almost universally require much heavier gauges. For a standard 100-amp or 200-amp residential service drop, utility companies and electrical standards mandate minimum sizes such as #2 aluminum (or larger) for secondary drops, and up to 4/0 aluminum or 2/0 copper for the actual service entrance conductors running through the mast. These sizing rules ensure that wires safely carry continuous household loads without dangerous overheating.
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