Switches are required to be marked according to which of the following?

Switches must be marked with their voltage and current ratings to ensure safe use in electrical systems. This marking provides essential information regarding the maximum voltage and current that the switch can handle without risking failure or causing hazards. Proper markings help to prevent improper use of switches, which can lead to overheating, electrical arcing, or even system failure.

Knowing the voltage and current ratings enables users, installers, and maintenance personnel to select the appropriate switch for their specific application, ensuring compatibility with the rest of the system. This practice is critical for maintaining safety standards and system integrity in electrical installations.