For outside branch circuits, what is the required vertical clearance above the roof level from the edge of the roof?

The correct answer is three feet. This measurement is primarily based on safety standards set forth in the National Electrical Code (NEC), which dictate that outside branch circuits need to maintain adequate clearance from the roof edge to prevent accidental contact or interference. A vertical clearance of three feet above the roof level helps ensure that electrical components are not adversely affected by snow accumulation or other environmental factors, which could cause hazards. Additionally, this clearance promotes better accessibility for maintenance and inspection, reducing the risk of accidents or damage. Therefore, three feet is established as the minimum requirement to ensure safety and compliance with electrical standards regarding outside circuits.