What is 4-4-4 triplex URD cable used for?

It is used for underground secondary distribution, such as service laterals to homes or small buildings and feeder runs to subpanels. The two phase conductors carry power and the neutral completes the circuit.

Can this cable be buried directly in the ground?

Yes. It is rated for direct burial and has a direct-burial ampacity of 123 A at 90°C. In duct, its rating drops to 90 A.

What size breaker can I use with 4-4-4 URD?

The cable is rated 123 A direct-buried, so it is often used on 100 A or 125 A circuits, depending on the load and code. Confirm the final breaker size with your local inspector and the NEC.

Does this cable work with aluminum lugs?

Yes, but use connectors and lugs listed for aluminum conductors. Apply an antioxidant compound and follow the lug manufacturer's torque spec to prevent loosening and corrosion.

What is the difference between triplex and quadruplex URD?

Triplex has two insulated phase conductors and a bare neutral twisted together. Quadruplex adds a second neutral, which can help with unbalanced loads or larger services.