Emergency and transitional sources of electrical powerU.K.
56.—(1) In every ship, there shall be provided a self-contained emergency source of electrical power which shall be so designed and arranged that it will operate at full rated power when the ship is listed 22.5 degrees and when the trim of the ship is 10 degrees from an even keel or any combination of heel and trim within these limits.
(2) The emergency and transitional sources of electrical power and the associated equipment shall be in accordance with the conditions and specifications set out in Schedule 7 in Merchant Shipping Notice MSN 1698 (M).