Which term defines the permitted height above a surface for open conductors?

• A. Minimum vertical clearance for open conductors
• B. Feeder and/or branch circuit mast
• C. Location of outdoor lighting lamps
• D. Multiwire branch circuit

Answer: (A)

This question is about the safety rule that specifies how high exposed conductors must be kept above a surface. The term that defines that permitted height is the minimum vertical clearance for open conductors. It communicates that there is a required minimum height above a surface that open, uninsulated conductors must meet to reduce the risk of contact or interference. The word minimum shows it’s a required clearance, not a preferred height, and vertical clearance specifies the distance measured upward from the surface.

The other options refer to different topics: a mast used to support feeders or branch circuits, where the focus is on support structure; the location of outdoor lighting lamps, which deals with fixture placement; and a multiwire branch circuit, which is about sharing a neutral between circuits. None of these describe the height requirement for open conductors.