protection devices
51High voltage — The term high voltage characterizes electrical circuits, in which the voltage used is the cause of particular safety concerns and insulation requirements. High voltage is used in electrical power distribution, in cathode ray tubes, to generate X… …
52Clean climbing — is a rock climbing term that describes techniques and equipment which climbers use in order to avoid damage to the rock. These techniques date at least in part from the 1920s and earlier in England, but the term itself may have emerged in about… …
53Overvoltage — This article is about a concept in electrical engineering. For use in electrochemistry, see overpotential. Voltage spike. When the voltage in a circuit or part of it is raised above its upper design limit, this is known as overvoltage. The… …
54Fire door — A fire door is a type of door, or barrier used as a passive fire protection item within buildings to prevent the spread of fire or smoke which may consist of dangerous chemicals. It is usually the only means of allowing people to pass through a… …
55Climbing style — Rock climbing History Styles Technique Equipment and protection Grades (difficulty of climb) Terminology Belaying Abseiling …
56Ring circuit — In electricity supply, a ring final circuit or ring circuit (informally also ring main or just ring) is an electrical wiring technique developed and primarily used in the United Kingdom that provides two independent conductors for live, neutral… …
57Noise-induced hearing loss — (NIHL) is an increasingly prevalent disorder that results from exposure to high intensity sound, especially over a long period of time. Contents 1 Description 2 Mechanism 3 Types 3.1 …
58Current transformer — A CT for operation on a 110 kV grid In electrical engineering, a current transformer (CT) is used for measurement of electric currents. Current transformers, together with voltage transformers (VT) (potential transformers (PT)), are known as …
59Supervisory circuit — Supervisory circuits are combinations of semiconductor devices that detect and monitor voltage levels in power supplies, microprocessors, and other systems. They are protection circuits that monitor one or more system parameters. When parameter… …
60Traffic Control — ➡ law enforcement * * * Introduction supervision of the movement of people, goods, or vehicles to ensure efficiency and safety. Traffic is the movement of people and goods from one location to another. The movement typically occurs… …
