Exam Question

### Introduction
In the event of a failure of the main source of electrical power, an independent emergency source of power must be available as mandated by SOLAS Chapter II-1. The primary purpose of this system is to ensure the safety of life, the ship, and the environment by supplying power to essential services required for safety and navigation during a blackout, and to facilitate a 'dead ship' recovery.
### Circuits Supplied by the Emergency Source of Power
As per SOLAS regulations and standard marine practice, the following circuits must be connected to the emergency switchboard. These can be categorized into services that are supplied for a specific period (e.g., 18 hours for cargo ships, 36 hours for passenger ships) and transitional services that are supplied until the emergency generator starts.