MRI scanning uses magnetism, radio waves, and a computer to produce images of body structures. MRI scanning is painless and does not involve x-ray radiation. Patients with heart pacemakers, metal implants, or metal chips or clips in or around the eyes cannot be scanned with MRI because of the effect of the magnet.
Electrical Switchgear Protection. Definition of Switchgear. A switchgear or electrical switchgear is a generic term which includes all the switching devices associated with mainly power system protection. It also includes all devices associated with control, metering and regulating of electrical power system. Assembly of such devices in a logical manner forms switchgear.
Access to the interior of the enclosure is provided by doors. or removable covers, or both. This definition appears in all three of the ANSI/IEEE standards cover-ing. the types of metal-enclosed power switchgear: C37.20.1, Metal-En-closed Low. Voltage Power Circuit Breaker Switchgear; C37.20.2, Metal-Clad Switchgear.