I didnt want to scare the fellow ;)

Commonly found in electrical control cabinets to clean up the point to point wiring (between plc, relays, buttons, etc) usually found with the cap missing and wires strewen around.

The cap pops off and the breaks in the duct allow wiring on either side. Done right it makes a panel look clean and generally makes diagnosing easier.

Misra certainly does exist and is the among the largest chapters.