Single Line diagram PTB

The symbol “M” inside a circle usually indicates:

• Meter
• Motor
• Manual switch
• Modem

What is the function of the MCC (Motor Control Center) in the diagram?

• Monitor current
• Control motor operations
• Provide grounding
• Supply lighting

Which device connects directly between the incoming feeder and the bus bar?

• CT
• Relay
• Circuit Breaker
• MCC

What is the main role of a circuit breaker in the diagram?

• Start motor
• Break the circuit during faults
• Step voltage up
• Measure frequency

The thick line labeled as “bus coupler” connects:

• Load to MCC
• Two bus bars
• PT to transformer
• Feeder to ground

A component labeled "G" inside a circle most likely refers to a:

• Ground
• Gate
• Generator
• Grid

What does the overall single line diagram help engineers understand?

• Cable routing
• Pipe connections
• Power flow and protection system
• Mechanical layout