According to 46 CFR, Subchapter J...

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According to 46 CFR, Subchapter J (Electrical Engineering), when supplying emergency lighting loads, the storage battery initial voltage must not exceed the standard system voltage by more than what percentage?

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🔍 Key Concepts

• 46 CFR Subchapter J requirements for storage batteries used for emergency lighting • Definition of standard system voltage vs initial battery voltage • Why excessive over-voltage can be harmful to shipboard electrical equipment

💭 Think About

• Look up the specific 46 CFR Subchapter J section that addresses storage batteries supplying emergency lighting and see what numeric limit is written into the regulation. • Think about typical acceptable over-voltage margins in marine DC systems — is a 2%, 3%, 5%, or 10% deviation more realistic for protecting sensitive lighting equipment? • Consider which of the choices would most likely be written as a regulatory design limit intended to prevent damage yet still allow for normal battery charging characteristics.

✅ Before You Answer

• Verify the exact percentage stated in the 46 CFR Subchapter J text for initial battery voltage above system voltage. • Confirm that the percentage applies to initial voltage of the storage battery, not charging voltage or some other condition. • Ensure you are reading the section for emergency lighting loads specifically, not for propulsion or other electrical systems.

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