In what order are Thru routed, with exceptions for cutters?

• A. From bottom to top
• B. Alphabetical order
• C. From top to bottom, except for cutters
• D. Random order

Answer: (C)

The usual rule for routing through a panel or bulkhead is to lay things in a top-to-bottom order. Starting with the highest run and then working downward keeps everything organized, makes it easy to trace paths, and reduces crowding or crossovers as you add more lines. It also helps with accessibility during inspection or maintenance, since you can follow a predictable vertical sequence without having to thread new routes around already-installed ones.

The exception for cutters means those particular components need a different placement to preserve clear access or proper clearance. By routing cutters outside the standard top-to-bottom stack, you ensure they can be operated safely and maintained without interference from the other routed lines.