Final answer:
An underground duct system can be used for installations like office lighting systems, large transformer vaults, and indoor fire alarm systems.
Step-by-step explanation:
An underground duct system can be used for the following installations:
- Office lighting system: An underground duct system can be used to route electrical cables for the lighting system in an office building.
- Large transformer vault: Installing an underground duct system can provide a safe and contained pathway for the wiring of a large transformer vault.
- Indoor fire alarm system: Using an underground duct system can help conceal and protect the wiring for an indoor fire alarm system.
Learn more about Underground duct systems