What is difference between metal clad & metal enclosed
switchgear?
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Answer Posted / karunakar
Metal-Clad Switchgear is an assembly of units characterized
by the following features:
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.
The Metal eclosed switchgear assembly consists of multiple
metal-enclosed, vertical sections. Normally the end
sections are designed to allow for installation of future
sections. Each vertical section consists of up to four
individually enclosed breaker or auxiliary compartments.
Compartments are sized to provide uniform height of each
switchgear assembly.
Various components such as circuit breakers,
instrumentation and control equipment, transformers,
relays, three-phase bus work, all internal wiring,
connectors, and other supporting equipment are included in
each assembly. These units can be directly coupled to 480V
motor control centers if desired
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