What is the difference between "single-pole" and "double-pole" switches?

The distinction between "single-pole" and "double-pole" switches is fundamentally tied to the number of circuits they control. A single-pole switch is designed to control a single circuit, which typically consists of a single hot wire that connects to the electrical load, allowing it to switch on or off. This makes single-pole switches ideal for standard lighting configurations where only one power line is managed.

On the other hand, a double-pole switch is capable of managing two circuits simultaneously. It effectively connects two hot wires, allowing it to control appliances or setups that require two separate circuits, such as 240-volt devices. This capability is particularly important in electrical systems where higher voltages are needed or where you need to safely switch off multiple connections at once.

Understanding this difference is vital for correct wiring practices, ensuring appropriate switches are used based on the electrical loads and circuit configurations involved.