To ensure that electrical supplies are available to emergency and safety systems, in the event of a main power failure, an emergency generator and associated emergency switchboard will be located above the main deck in a separate space, completely isolated from the main machinery spaces.
Emergency services would be supplied from the emergency switchboard using distributed panels for navigation, safety and emergency lighting services.
These distribution panels are also generally arranged to be above the bulkhead deck.
Where lighting is concerned, it is important to ensure that a fire or flooding in one area will not cause the loss of lighting supply in other areas or along escape routes and the circuitry must be designed in compliance with the ships general arrangements,
According to the requirements of the classification societies, additional emergency stop circuits have to be installed for certain consumers at a location that is separate from their installation position, e.g., in order to switch off fans, the fuel or oil pumps in the endangered area if there is a fire.