Filipino Engineer

The selection of the type of switchgear to be used in a project is a tedious job. Design engineers need to know what are the requirements of the project to be able to specify what type of switchgear is needed. In a project with a highly skilled personnel and requires monitoring, a metal-clad switchgear is recommended.

Additional features of metal-clad switchgear are:

• The main interrupting device is removable and arranged with a mechanism for moving it physically between connected and disconnected positions. It is equipped with self-aligning and self-coupling primary and secondary disconnecting devices.
• The interrupting devices, buses, voltage transformers, and control power transformers, are completely enclosed by grounded metal barriers, which have no intentional openings between compartments. A metal barrier in front of the interrupting device ensures that when, in the connecting position, no live parts are exposed by the opening of an enclosure door.
• All live parts are enclosed within grounded metal compartments.
• Automatic grounded metal shutters cover primary circuit elements when the removable element is in the disconnected, test, or removed position.
• Primary bus conductors and connections are covered with track-resistant insulating material throughout.
• Mechanical interlocks are provided to maintain a proper and safe operating sequence and to ensure matching ampacities between circuit breaker and cell.
• Grounded metal barriers isolate and ground instruments, meters, relays, secondary control devices, and their wiring from all primary circuit elements. If a short circuit or fault occurs, all damage is contained within the metal-clad enclosure.

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