Electrical Switchgear

An electric Power System used in association with the term switchgear refers to a combination of circuit breakers, electrical disconnects and/or fuses. These electrical switchgear are used to clear faults downstream and also to de-energize equipment (allowing work to be performed on the equipment). Switchgear is never said as Switchgears because it is already a plural much like many other terms (an example being the term Code/Codes).

Depending on what the switchgear is used for it may be housed in different ways and locations, Switchgear for low voltage situations are often fully enclosed in a building. When the voltage levels exceed 66kV the switchgear is often be found mounted in an outside environment where it can be insulated by the air. They are not small devices by any means and require a lot of space, there are ways to save on space by using Gas insulated switchgear, however the cost of the equipment is increased so it becomes a matter of weighing up which is more important (space or money).

There are a multitude of standards that govern the specification, design and ratings of switchgear. The standards used in the United States are mostly ANSI and IEEE standards; throughout the rest of the world the IEC standard is commonly used. It is important these standards are met because they help maintain safety not to mention they are a legal requirement.

Trapped Key Interlocking is a safety feature that is implemented in the design of these devices, it was a technique1) A technique is a particular method of doing an activity, usually a method that involves practical skills; 2) Technique is skill and ability in an artistic, sporting, or other practical activity that you develop through training and practice. invented in 1922 and helps increase safety.

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