Service and feeder load calculation methods and demand factors tested on electrician licensing exams.
29 cards · basic cards · AI-written, checked twice. Edit anything.
- What is demand load in electrical calculations?
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The maximum current or power a device or circuit will draw during normal operation, not the total connected capacity.- Define connected load.
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The total capacity of all equipment that could be connected to a circuit or service, regardless of whether it is all operating at once.- What is a demand factor?
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The ratio of the maximum demand to the connected load, expressed as a decimal or percentage.- Define diversity factor.
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The ratio of the sum of individual maximum demands to the overall maximum demand of a group of loads.- What is load factor?
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The ratio of average load to peak load over a specified period of time.- What defines a continuous load?
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A load where the maximum current is expected to continue for 3 hours or more.- What defines a non-continuous load?
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A load where the maximum current is expected to continue for less than 3 hours.- Which NEC article covers load calculations for dwellings?
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Article 220 of the National Electrical Code.- What general lighting load density is used for a dwelling?
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3 watts (or VA) per square foot, per NEC Table 220.12.- What general lighting load density applies to an office building?
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5 watts (or VA) per square foot, per NEC Table 220.12.- What general lighting load density applies to a retail store?
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5 watts (or VA) per square foot, per NEC Table 220.12.- What demand factor applies to general lighting in a single-family dwelling?
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100 percent for the first 3000 watts, then 35 percent for the remainder.- What demand factor applies to small appliance branch circuits in a dwelling?
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75 percent of the nameplate rating.- What demand factor applies to an electric range rated 12 kW or less?
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80 percent of the nameplate rating.- What demand factor applies to an electric dryer in a dwelling?
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75 percent of the nameplate rating, or a minimum of 5 kW, whichever is greater.
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