Question 390Electricity & Electronics - Assistant Engineer

70% to pass

It is desired to add additional 120 VAC, 100 watt lighting fixtures in the accommodations, port side fed from circuit No.1

Aas illustrated in the lighting panel L110 of the illustration. According to 46 CFR 111.75-5, what would be the maximum allowable additional lighting fixtures that could be installed
B1 fixture
C2 fixtures
D3 fixtures
AI Explanation

The correct answer is D) 3 fixtures. According to 46 CFR 111.75-5, the maximum allowable additional lighting fixtures that can be installed on circuit No. 1 is 3. This is because the regulation states that the total connected load on a lighting branch circuit must not exceed 80% of the circuit's rating. With each fixture being 100 watts, and the circuit being 120 VAC, the total additional load from 3 fixtures would be 300 watts, which is within the 80% limit of the circuit's capacity. The other options are incorrect because 1 fixture (B) would be too low, and 2 fixtures (C) would exceed the 80% limit of the circuit's rating.

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Official Resources
46 CFR Electrical Engineering 46 CFR Machinery & Electrical USCG National Maritime Center
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