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Regulation 13 – Openings in Watertight Bulkheads Below the Bulkhead Deck in Passenger Ships – Set B

Source: SOLAS Chapter II-1, Part B-2 – Subdivision, Watertight and Weathertight Integrity, Regulation 13 – Openings in watertight bulkheads below the bulkhead deck in passenger ships.
Reference: imorules.com – SOLAS II-1 Regulation 13

Question 3 of 10
3. On failure of either the main or the emergency source of electrical power, the control, indication and alarm circuits for power-operated sliding watertight doors must be capable of being automatically supplied by: