What term refers to a structure that supports electrical conductors?

• A. Feeder and/or branch circuit mast
• B. Porcelain or glass insulators
• C. The lowest height that conductors must be above a surface
• D. Drainage for a raceway

Answer: (A)

The thing being tested is the term for the structure that holds up electrical conductors. The correct term is a feeder and/or branch circuit mast. A mast is the vertical member that carries the conductors, and when describing supports for feeders or branch circuits, this precise label is used. It directly identifies the component that supports the wires themselves, rather than other items involved in the system.

Insulators are the devices that isolate the conductor from the support, not the structure that carries the wires. The lowest height above a surface describes a clearance requirement, not the name of the support. Drainage for a raceway is unrelated to the support structure. So the feeder and/or branch circuit mast correctly names the component that physically supports the conductors.