The minimum clearance above the roof for service conductors with less than 6 ft of conductor passing is?

The minimum clearance above the roof for service conductors that pass over a roof for less than 6 feet is 18 inches. This requirement is established to ensure safety and reduce the risk of accidental contact with the conductors, which could happen during maintenance or roof work. The clearance allows for adequate space above the roof surface to avoid damage from snow accumulation or other obstructions, ensuring that the conductors remain accessible and protected.

This specific measurement is also designed to maintain accessibility for emergency situations and regular inspections while adhering to the safety standards set forth in the National Electrical Code. It's important to note that higher clearances may be required based on specific conditions, such as when conductors are to be run over a flat roof or if this section of the NEC applies to other installations.