According to 46 CFR, Subchapter J (Electrical Engineering), what is the required minimum capacity in terms of hours of operation required of the emergency power sources for cargo vessels certified for all waters and 1600 GT or more?
• 46 CFR Subchapter J – especially Part 112 – Emergency Power Systems • Differences in emergency power duration for cargo vs. passenger vessels • How required duration changes with tonnage (≥1600 GT) and route (all waters/oceans)
• Look up the specific table or section in 46 CFR Subchapter J that lists minimum hours of operation for emergency power sources on cargo vessels and compare the numbers you see to the choices given. • Ask yourself: for a large oceangoing cargo vessel, would regulations usually require only a short-term backup, or something that can cover a prolonged casualty with loss of ship’s service power? • Consider whether the hours requirement is tied to supporting just emergency lighting, or a combination of emergency lighting, communications, navigation lights, and essential machinery.
• Confirm you are reading the section that applies to cargo vessels ≥1600 GT on oceans/all waters, not passenger vessels or smaller vessels. • Verify that the capacity requirement is expressed in hours of operation of the emergency source (generator/batteries), not just battery capacity for individual units like emergency lights or radios. • Double‑check that the number you select matches the value given specifically for cargo ships on all oceans, not harbor or limited‑area service.
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