In accordance with 46 CFR Part 112, a storage battery for an emergency lighting and power system must have the capacity to accomplish which of the following?
• 46 CFR Part 112 emergency lighting and power system requirements • Specific duty of storage batteries serving emergency power (not normal ship’s service) • Relationship between emergency power and operation of watertight doors
• Ask: Is this question about how fast watertight doors must operate, or about how much work (how many operations) the emergency battery must be able to perform? • Consider what would be critical during an emergency: do you need multiple full cycles of all watertight doors, or only a limited number of operations? • Think about whether 20 seconds or 45 seconds is more likely related to mechanical door speed rules, rather than battery capacity rules.
• Verify in 46 CFR Part 112, Subpart 112.15 (or nearby sections) the stated requirement for storage battery capacity for emergency systems. • Confirm whether the regulation talks about number of operations of watertight doors only, or also specifies a time limit for those operations. • Check that you are not confusing this with separate rules that govern watertight door operating speed (how quickly a single cycle must occur).
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