Which of the following is a common low voltage application for residential settings?

In residential settings, networking systems are a prevalent low voltage application. These systems support the infrastructure for internet connectivity, data transmission, and communication within homes. They typically operate on low voltage, making them suitable for residential environments where higher voltages can be hazardous.

Networking systems can include wired components such as Ethernet cabling and wireless components like routers and access points. These systems enable various devices, including computers, smart TVs, and mobile devices, to interact with one another and access the internet, which has become essential in modern households.

The other options listed are not typically considered low voltage applications. High voltage electrical wiring is used for power distribution and is not suitable for residential low voltage systems. Residential solar panel systems, while they do operate at lower voltages than traditional power lines, typically involve higher voltage conditions for efficiency and are connected to inverters that can operate at varying voltages. Substation transformers are related to high voltage infrastructure and power distribution, again falling outside the low voltage category typically discussed in residential contexts.