Q2
In the event of a failure of the main electrical power supply on a ship, an emergency source of power must be available. State the circuits which must be fed from such a source and discuss the reasons governing the selection of such circuits.
Reference Answer
### Introduction In the event of a failure of the main source of electrical power, SOLAS mandates that an emergency source of electrical power must be provided. The primary purpose of this system is to ensure the safety of life, the safety of the ship, and the protection of the marine environment during a blackout. The emergency source, typically a diesel generator and/or batteries, must start automatically upon main power failure and connect to the emergency switchboard within 45 seconds. The selection of circuits to be supplied by this emergency source is not arbitrary; it is strictly governed by international regulations (primarily SOLAS Chapter II-1, Regulations 42 for Cargo Ships and 43 for Passenger Ships). The governing principle is to supply power to services that are essential for: 1. **Safety of Navigation:** Maintaining control and preventing collisions.
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