HOLT Electricians Practice Exam

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What is the demand percentage used to calculate receptacles on a boat yard feeder?

30 percent
50 percent
75 percent
100 percent

The correct answer is: 50 percent

The demand percentage used to calculate receptacles on a boat yard feeder is 50 percent. This figure aligns with standard practices outlined in the National Electrical Code (NEC) where receptacles are not continuously loaded. The 50 percent allowance reflects the principle that not all receptacles will be in use at the same time, so this helps contractors and electricians to size feeders appropriately without overestimating the load. In boat yards, where there are multiple receptacles for various uses such as charging batteries and powering tools, applying this demand factor helps ensure that the feeder system can handle the expected loads without unnecessary upgrades or costs. This also helps improve safety by preventing overheating in wiring that could occur if the feeder were sized as if all receptacles would be drawing full power simultaneously. The consideration of load management is critical in electrical design, particularly in environments like boat yards where there may be diverse and unpredictable usage patterns.