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Flashcard · Definitions, Theory, and Plans

Where do you find NEC defined terms?

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Where do you find NEC defined terms?: Article 100. Check there first when a question turns on a defined term.Article 100
Ohm's law in three forms?: E = I x R, I = E / R, R = E / I. Volts, amperes, ohms.Electrical theory (no NEC section)
Power formulas for single-phase and three-phase loads?: Single-phase VA = V x A. Three-phase VA = V x A x 1.732. Watts = VA x power factor.Electrical theory (no NEC section)
Amperes for a 24 kVA, 208 V, three-phase load?: 24,000 / (208 x 1.732) = 66.6 A.Electrical theory (no NEC section)
What does the resistance of a conductor do as length and size change?: Resistance rises with length and falls as the conductor gets larger.Electrical theory (no NEC section)
Total resistance of resistors in series?: Add them. Current is the same through each.Electrical theory (no NEC section)
Two equal resistors in parallel?: The total is half of one. Voltage is the same across each.Electrical theory (no NEC section)
Two 12 ohm resistors in parallel. Total?: 12 / 2 = 6 ohms.Electrical theory (no NEC section)
What does a continuous load mean in the NEC?: A load expected to run for 3 hours or more.Article 100
Where do you learn what a plan symbol means?: The legend defines each symbol. Read the legend and the general notes before the sheets.Plan reading (no NEC section)
A plan scale of 1/4 in. = 1 ft. A line measures 6 in. What length?: 24 ft.Plan reading (no NEC section)
Continuous vs noncontinuous: what separates them, and what changes in the sizing?: Duration. Continuous means the maximum current is expected to run 3 hours or more. Only the continuous part gets the extra margin (125% in the usual exercise), and the noncontinuous part counts at 100%.NEC Article 100, Continuous Load (section text not re-read for 2026)