Q1 Flashcards
How many diesel generators on generic distribution system?
4
EDC stand for?
Electrical distribution centre
How many EDCs on generic distribution system?
4
MCCB stand for
Moulded case circuit breaker
5 main breakers?
Supply breaker, shore supply/ship alongside breaker, bud bar linking breaker, feeder breaker
What is the power book and when’s it used
Shows the distribution of 440v services and used when tracing which services are fed from fuse panels, transformers, MCCB and EDC
What is the lighting book
Shows 115/230v and traces where services are fed from
What is the reference book
Lists fittings symbols and pattern numbers
Ration for 440v
3:1
Ratio for 115v
2:1
What’s breaker discrimination
The breaker closest to the fault would trip
MCR stand for
Machinery control room
PCP and SCP stand for?
Primary control position and secondary control position
Metres fitted to a switchboard
Voltmeter
Ammeter
KW meter
Frequency meter
Syncroscope
Where are breaker operating switches found and what are they called
Discrepancy switches in the PCP
Describe the connection of shire supply
- Send a signal 24 hours before
- Obtain permit to work
- Rack out the breakers
- Check it’s dead
- Obtain castel key
- Test the shore supply cables
- Shore supplies cables are brought on ship and secured
- cables are connected to the shore supply box
- inform the dockyard to switch on the power
Rules when earthing the ship
Must be earthed to jetty or ship alongside
More than half the length of the ship
Gangway must be earthed
What’s used to confirm correct phase rotation
Phase sequence indicator
Light on the right should be brighter
What is motor rotation is wrong
Motor would run backwards
3 types of hand changeover switches
Normal/alternate
Normal/emergency
Normal/alternate/emergency
3 kinds of changeover switches
ACOS
HCOS
ROCOS
What and where are 440v earth testing facilities found
Earth indicator light in switchboard
Some have audible alarms
Why are there separate 115 testing facilities
115v is a transformed supply and isn’t secondary winding isn’t connected to the primary winding
