What is the most common underground system used for residential distribution?

The most common underground system used for residential distribution is Direct Bury. This method involves placing electrical cables directly into the ground without the need for protective conduit. Direct bury cables are designed to withstand environmental conditions and physical stress, which makes them suitable for residential applications. The simplicity and cost-effectiveness of this approach contribute to its widespread use, as it eliminates additional materials and labor associated with installing conduit.

Other options, such as conduit systems, do offer additional protection and may be used in more complex installations or areas requiring extra safeguards, but they are not as prevalent as direct bury for standard residential distribution. Similarly, while trench and fill and buried cables can be similar in function, they typically involve more complex installation methods or additional components, making direct bury the go-to choice for common residential distribution needs.