What is Shore Supply Connection and Arrangement shore supply

What is Shore Supply Connection 

A shore supply connection is required so that the ships generators and their prime movers can be shut down for major overhaul during a dry docking period.

There must be a suitable connection box and a power cable to be connected into the box. The connection box is usually located at the entrance to the accomodation or in emergency generator room.

• Power supply (electricity) from shore.
• It is required when generators and their prime movers are shut for major overhaul. (at dry docking)
• Also in emergency on port or shore
• SOLAS Chapter-II (1)
  

Arrangement shore supply:

• There is a suitable connection box (CB) to accept the shore supply cable.
• Located at the entrance to the accommodation or in the emergency generator room.
• CB must have appropriate terminals to accept the shore supply cable. It must have a circuit breaker or an isolator switch and fuses to protect the whole arrangement.
• In connection box: Voltmeter - to indicate the polarity of D.C supply, Phase sequence indicator - to indicate the correct phase sequence of A.C supply.
• Normally the shore supply switch on the main switchboard is interlocked with the generator circuit breakers.

Note: (Shore supply may have different frequency and voltage from ship's system.)

Now, there are 4 simple possible situations:

• Ship's rated voltage > supplied voltage - current high, heating
• Ship's rated voltage < supplied voltage - heating
• Ship's rated frequency > supplied frequency - current high, speed low, over heat
• Ship's rated frequency < supplied frequency  - current low, speed high, over heat

1. Follow correct procedures for shore supply, because it may harm many systems.
2. Always check- voltage, phase sequence, close generator ACBs, isolate all non-essential services. 

Read also: Why high voltage system used on ships?

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