It is desired to add additional 120 VAC, 100 watt lighting fixtures in the accommodations, port side fed from circuit No.1 (1L110) as 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? Illustration EL-0013
• 46 CFR 111.75-5 branch-circuit loading limits for accommodation lighting • How to convert breaker amperage and circuit voltage into maximum allowable watts • Using the existing connected load on circuit 1L110 from the panel schedule to find remaining capacity
• From the rating of the 1L110 circuit breaker and the circuit voltage, what is the maximum wattage that CFR allows you to connect on this branch? • Comparing that maximum allowable wattage to the 1240 W already shown for 1L110, how many additional 100 W fixtures can you add before reaching the limit? • Does the regulation require you to stay below the full breaker rating, and if so, by what percentage should you reduce it when calculating allowable load?
• Confirm the breaker size (amperes) and voltage for circuit 1L110 from the illustration • Apply the correct percentage limit from 46 CFR 111.75-5 to the breaker rating before converting to watts (do not just use 100% unless the rule says so) • Make sure the sum of existing load plus added fixtures does not exceed the allowable watts you calculated
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