101 Basic Series - Module 27 - CEU Education
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Switchgear is a term used to describe assemblies of switching and interrupting devices along with control, metering, protective, and regulating equipment.
In a medium voltage metal-clad switchgear assembly, all main bus and connections are insulated.
The automatic shutter system prevents contact with live primary current carrying parts by closing when the breaker is levered out of the "CONNECTED" position.
The space between the front of the circuit breaker and the front doors of the assembly is occupied by the ________.
Main Bus Compartment
Ground Bus Compartment
Finger Cluster Compartment
When circuit breaker and/or auxiliary equipment is stacked in a medium voltage switchgear structure, temperature requirements must be considered.
Access to the line compartment is made through rear panels or doors.
________ devices check and or regulate the flow of power in medium voltage switchgear.
A weatherproof enclosure that allows switchgear, motor starters, and MCCs to be located in one area is called ________.
Outdoors control room
Primary and secondary electrical connections are made and live when the breaker is in the "TEST" position.
Safety interlocks are not required by governing standards and are supplied as an option by some manufacturers.
Vertical structures of medium voltage switchgear are usually ____ inches wide.
All of the above
Design and proof testing show compliance with ANSI standards and includes:
Short circuit test
Continuous current test
All of the above
Circuit breakers in medium voltage switchgear assemblies have three primary connections.
This design component allows breakers and other devices to be withdrawn form their compartments for inspection and maintenance.
The circuit breaker makes its primary bus connection using ________.
The main bus of medium voltage switchgear assemblies are usually solid copper bars.
Medium voltage switchgear assemblies generally fall into the voltage categories of 5 and 15kV, 27kV, and 38kV.
The term "Metal-Clad" means that the structures (and compartments within each structure) are physically separated from each other by grounded metal barriers.
When selling Medium Voltage Switchgear in NEMA markets, "Metal-Clad" structures are always used.
The secondary contact plugs can be manually engaged when the circuit breaker is in the TEST position.
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