A power system of a floating vessel, in particular of a dynamically positioned offshore vessel, comprising: - at least two segregated power system sections (31, 32), each comprising at least one electrical power source, in particular a generator, and a directly powered main switchboard (11, 12) which is supplied with electrical power from the electrical power source, wherein the directly powered main switchboard (11, 12) is configured to distribute electrical power to one or more thruster drives of the floating vessel for operating the respective thruster drives, - at least two indirectly powered main switchboards (21, 22) to each of which a thruster drive of the floating vessel is connected, wherein each indirectly powered main switchboard (21, 22) is configured to receive electrical power indirectly from at least one of said electrical power sources via at least one of said directly or indirectly powered main switchboards, wherein each indirectly powered main switchboard (21, 22) is configured to supply electrical power to the respective connected thruster drive for operating the thruster drive, wherein the at least two directly powered main switchboards (11, 12) and the at least two indirectly powered main switchboards (21, 22) are connected in a ring configuration such that two or more indirectly powered main switchboards (21, 22) are connected in series between a first directly powered main switchboard and a second directly powered main switchboard characterized in that at least two of said indirectly powered main switchboards (21, 22, 23, 24) are series connected between two directly powered main switchboards (11, 12) to form a first loop and at least two of said indirectly powered main switchboards (25, 26, 27, 28) are series connected between two directly powered main switchboards (12, 13, 14) to form a second loop; the first loop being connected between said first and second directly powered main switchboards (11, 12) and the second loop being connected between said second and a third directly powered main switchboard (12, 13), or the first loop being connected between said first and second directly powered main switchboards (11, 12) and the second loop being connected between third and fourth directly powered main switchboard (13, 14); and, wherein each segregated power system section (31, 32) comprises an engine room in which the electrical power source is located and a switchboard room in which the directly powered main switchboard (11, 12) is located, the engine rooms and the switchboard rooms being located in the same section of the floating vessel, wherein the indirectly powered main switchboards (21, 22) are arranged in further rooms, in particular thruster rooms or switchboard rooms, located in a different section (220, 230) of the floating vessel. - at least two segregated power system sections (31, 32), each comprising at least one electrical power source, in particular a generator, and a directly powered main switchboard (11, 12) which is supplied with electrical power from the electrical power source, wherein the directly powered main switchboard (11, 12) is configured to distribute electrical power to one or more thruster drives of the floating vessel for operating the respective thruster drives, - at least two indirectly powered main switchboards (21, 22) to each of which a thruster drive of the floating vessel is connected, wherein each indirectly powered main switchboard (21, 22) is configured to receive electrical power indirectly from at least one of said electrical power sources via at least one of said directly or indirectly powered main switchboards, wherein each indirectly powered main switchboard (21, 22) is configured to supply electrical power to the respective connected thruster drive for operating the thruster drive,