National Electrical Code standards and utility regulations mandate strict clearance heights for overhead service drop cables crossing driveways and roadways to prevent contact with tall vehicles. Specifically, where an overhead service drop passes over a residential driveway, alleyway, or parking lot subject to truck traffic, the lowest point of the sagging cable must maintain a minimum vertical clearance of 12 feet above the finished grade. If the service drop crosses public streets, roads, or commercial driveways, that minimum height requirement increases to 15 to 18 feet for safety.
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