What type of electrical appliances should be connected to isolated sources at low voltage?

Connecting low voltage AC and DC appliances to isolated sources is essential for safety and functionality. Isolated sources are typically designed to provide power without direct electrical connections to high voltage systems, minimizing the risk of electric shock or equipment damage. Low voltage appliances, being lighter in power demand and often more sensitive, benefit significantly from this arrangement as it allows for easier operation and safety compliance.

Using isolated sources helps in providing a controlled environment for low voltage appliances, which might include items like small motors, lighting systems, and electronic devices that operate effectively at lower voltages. This configuration not only enhances operational safety but also ensures compatibility with the lower current and power requirements of these appliances.

In contrast, heavy-duty machinery and high voltage devices generally require dedicated power supplies or systems that are specifically engineered to handle the higher stress and safety requirements associated with their operations. Using isolated sources for such high-demand equipment might lead to performance issues or failures. Battery systems, while they can be used for isolation, do not encompass all low voltage appliances, making them an incomplete choice for the intent of the question. Therefore, the most appropriate connection for low voltage appliances indeed lies with isolated sources.