In an institution with a large patient population and a campus covering many large buildings and several acres, access to unoccupied electric beds for electric safety testing was difficult. This situation resulted in poor compliance with safety inspection schedules. To solve the problem, a device was constructed which measures current leakage using an isolated ac line and an isolated ground. This permits leakage testing of a grounded bed without creating potentially hazardous currents. Since the patient is protected, electrical safety testing can be performed on occupied beds, increasing efficiency and eliminating both logistical and safety inspection compliance problems.