Most hospitals in the United States of America have a preventive maintenance (PM) program for biomedical equipment, which is a requirement of the Joint Commission on Accreditation of Healthcare Organizations. Biomedical engineers inspect all biomedical devices (like IV pumps, ventilators, and electrocardiogram (EKG) monitors) on a regular schedule and complete any PM recommended by the manufacturer to ensure safe operation and warranty coverage. Some very large and complex pieces of equipment, such as Computed Tomography Imaging (CT) Scanners and most radiology equipment, have PM completed by the vendor. Most PM plans also include all electrical items in use — microwaves, photocopiers, etc. — to check annually for electrical safety as part of the fire safety plan (also required).