Overall Pad Questions Flashcards
How many diesel gen are fitted to a generic distribution system
4
What does EDC STAND FOR
Electrical distribution centre
How many exc are fitted to a distribution centre
4
What does MCCB stand for
Moulded case circuit breaker
List 5 main breakers fitted to a generic distribution system and explain uses
1supply breaker/shore supply 2alongside breaker 3 Bus bar linking braker 4 Interconnecting breaker 5 Feeder breaker
What’s the power book /when is it used
The power book shows distribution of all 440v services used when tracing which. Services are fed from which fuse panel ,transformer ,mccb and edc
What does pcp stand for /scp
Primary control position/secondary control position
What is the ratio for 440v fuses regarding fuse discrimination
3:1
What is the ratio for 115v fuses regarding fuse discrimination
2:1
Explain breaker discrimination
The breaker nearest to the fault would trip first and the supply breaker being the furthest from the fault would be last to trip
What does mcr stand for
Machinery control room
List the meters fitted to a switchboard generator section
Voltmeter Ammeter Kw meter Frequency meter Syncroscope Earth meter
3 hand changeover switches
1) Normal,alternative
2) normal ,emergency
3) normal,alternative,emergency
What are the main voltages and frequency used in the c and c switchboard
1) 24 V DC
2) 115 V, 400 Hz
What does TRU stand for
Transformer rectifier unit
