Section 8 Main Source of Electrical Power

801. Main source of electrical power

1. In addition to complying with Ch 6, 201., the main source of electrical power is to comply with the following:

(1) The arrangement of the unit’s main source of power is to be such that the services referred to in Ch 6, 102. 1 can be maintained regardless of the speed and direction of the main propelling engines or shafting.

(2) The generating plant is to be such as to ensure that with any one generator or its primary source of power out of operation, the remaining generator or generators will be capable of pro-

viding the electrical services necessary to start the main propulsion plant from a dead condition. The emergency generator may be used for the purpose of starting from a dead

ship ship

condition if its capability either alone or combined with that of any generator is sufficient to provide at the same time those services required by Ch 6, 206. 6 (1) to (4).

(3) For electrically self-propelled units, the application of Ch 6, 201. 2 need only include for pro-

pulsion sufficient power to ensure safe navigation when underway.

(4) Where electrical power is necessary to restore propulsion, the capacity is to be sufficient to re- store propulsion to the unit in conjunction with other machinery, as appropriate, from a dead

ship condition within 30 min after blackout.

2. The main switchboard is to be so placed relative to one main generating station that, as far as is practicable, the integrity of the normal supply may be affected only by a fire or other casualty in one space. An environmental enclosure for the main switchboard, such as may be provided by a machinery control room situated within the main boundaries of the space, is not to be considered as separating the switchboards from the generators.

3. In every unit where the total installed electrical power of the main generators is in excess of 3 MW, the main busbars are to be subdivided into at least two parts which are to normally be con-

nected by removable links or other approved means;so far as is practicable, the connection of gen-

erators and any other duplicated equipment are to be equally divided between the parts. Equivalent

alternative arrangements should be permitted.

802. Emergency source of electrical power

In addition to complying with Ch 6, 202., the emergency source of power is to provide:

(1) For a period of 18 hours, emergency lighting at the steering gear;

(2) For a period of 18 hours:

(A) navigational aids as required by SOLAS chapter V;

(B) intermittent operation of the daylight signalling lamp and the unit’s whistle;

unless they have an independent supply from an accumulator battery suitably located for use in an emergency and sufficient for the period of 18 hours;

(3) For the period of 30 minutes or a lesser period as permitted by SOLAS regulation II-1/29.14, the steering gear.