What structure is used to connect the cables at the top of the tower to the bottom of the tower?

• A. Cable Tray
• B. Conduit
• C. Duct
• D. Busbar

Answer: (B)

Vertical cable runs need a protected, enclosed path so conductors stay safe from weather and physical damage while still being easy to pull into place. Conduit provides that by being a rigid or flexible tube that houses the cables and protects them from moisture, dust, and impact. Cable tray is an open support system and doesn’t enclose the cables, so it isn’t ideal for a protected vertical run. Duct is a broader term often used for ventilation or different kinds of ducts and isn’t the standard term for routing electrical cables up and down a tower. Busbar is a flat conductor used inside equipment to distribute power, not for running cables between the top and bottom of a structure. So conduit is the appropriate choice.