Answer / 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

Answer / gurumurthy.k

The Simple reply is " A metal clad can be a metal enclosed
but a metal enclosed can not be metal clad". Which
means , the Metal enclosed need not have a compartments
within its structure, can have fixed interupting medium and
and safety related issues. These are applicable for a low
coltage swicth board but metal clad is more apt for medium
coltage.

i have been tasked with a design of protection, metering and control(PMC) relay panel extension to accommodate all PMC relays.There is an already existing panel where this one will be built.What are the design aspects for this kind of project? thank you.

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which one cable has a more resistance.A big or small

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Pl. brief about break-down maintenance of machine tool.

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What happen if we apply square wave or traiangular waveform voltage to the transformer primary winding instead of sinusoidal wave?

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hello friends this is krunal here.. i have applied for he officer train in hpcl electrical stream.. any one who have applied before for electrical stream please help me out.. post ur reply to my mail id: krunal_airforce@yahoo.com.. any tips, old questions for paper or any help will do.. plz help me.. your faithfully, Krunal Darji

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What is Diff btw MCP & MCB????

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why transformer rating in KVA ?

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