103 Division of main busbarsa) Where the main source of electrical power is necessary for propulsion of the ship, and for high voltage distribution systems, the main busbar shall be subdivided into at least two parts which shall normally be connected by circuit breakers or other approved means; so far as is practicable, the connection of generating sets and other duplicated equipment shall be equally divided between the parts. (Interpretation of SOLAS Ch. II-1/41.5.1.1 and 41.5.1.3)b) Where two separate switchboards are provided and interconnected with cables, a circuit breaker with protection as required by G201 and breaking capacity as required by G202 shall be provided at each end of the cable. See Sec.4 B106. (IACS UR E11 2.1.1)Guidance note:The requirement for division of main busbars applies to all voltage levels where services necessary for propulsion of the ship are supplied from. The emergency electrical power supply system should not be used to comply with this requirement.---e-n-d---of---g-u-i-d-a-n-c-e---n-o-t-e---Guidance note:Other approved means can be achieved by:Circuit breaker without tripping mechanism; or disconnecting link or switch by which busbars can be split easily and safely. Bolted links, for example bolted busbar sections, are not to be accepted.Single failure means failure in any single circuit, feeder, transformer or part of switchboard within one bus tie section.
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