The voltage between slip rings can vary depending on the specific application and system requirements. Slip rings are used to transfer electrical signals and power from a stationary component to a rotating component or vice versa. The voltage between slip rings will depend on the voltage of the electrical system they are being used in.

In industrial applications, slip rings can be designed to handle low voltages (e.g., a few volts) or high voltages (ranging from hundreds to thousands of volts). For example, in wind turbines, slip rings may be used to transfer electrical power from the rotating blades to the stationary part of the turbine, and the voltage can be in the range of several kilovolts.

It's important to consider the voltage requirements and specifications of the specific application when selecting slip rings to ensure they are suitable for the intended voltage levels.