# data[].attributes.body
Onboard power is produced when a main engine and an alternator work together. For this purpose an alternating current generator is used.

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Some points that should be taken into account about the energy produced on board are:

# data[].attributes.subject
Some points that should be taken into account about the energy produced on board are:

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AC, three-phase power is preferred over DC as it gives more power for the same size.

The three-phase is preferred over the single phase, as it obtains more power and in the event of a failure of one phase, the other two can continue working.

# data[].attributes.body
Ship generator
Main distribution board
Bar bus
Circuit breakers
Fuses
Transformers

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The ships power is supplied through circuit breakers and high voltage auxiliary machines.

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In the event of failure of the ship's main power generation system, an emergency or standby power unit is used, which must ensure that critical machinery continues to operate the ship.

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The emergency power supply must be capable of supporting all essential systems such as:

# data[].attributes.subject
The emergency power supply must be capable of supporting all essential systems such as:

# data[].attributes.body
Direction system.
Emergency bilge and fire pumps.
Watertight doors.
Fire system.
Navigation and emergency lights.
Communication and alarm systems.