Electrical safety in the use of biofeedback instruments

Electrical hazards associated with the use of medical apparatus are described with emphasis on biofeedback instruments. Safety standards specify safe current levels for instruments in normal operation; however, the user can take steps to provide back-up protection against hazards caused by component malfunction or breakdown. Measures for protection of patient and operator are outlined, including instrument design considerations and guidelines for the user to follow in order to provide a margin of safety.