T&D World Magazine
BioCompliance Consulting Inc Flashover tests Photo by EPRI.

An air gap flashover occurs between an energized conductor and a tree during high-voltage testing.

Flashover Tests Verify Minimum Clearances

Conductor-to-tree air gap flashover testing provides the basis for minimum vegetation clearance distances in FAC-003-4.  

Following the Northeast blackout of Aug. 14, 2003, the Federal Energy Regulatory Commission and, subsequently, the North American Electric Reliability Corporation (NERC) have been focused on reducing vegetation-related incidents by enforcing a transmission vegetation management standard. This standard, FAC-003-1, was adopted in 2006 and enforced in 2007 as a NERC facilities design, connecti

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