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Flashcard · Definitions, General Requirements, and Plans

Where are NEC definitions?

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Where are NEC definitions?: Article 100, in alphabetical order. The 2023 edition gathers nearly all defined terms there.NEC 2023 Article 100
What does Article 90 cover?: The Code's purpose and scope, how it is enforced, and how to read mandatory rules, permissive rules and informational notes.NEC 2023 Article 90
Does an informational note create a requirement?: No. It explains or recommends. Only the rule text itself is enforceable.NEC 2023 Article 90
"Shall" versus "shall be permitted"?: "Shall" is mandatory. "Shall be permitted" allows something but does not require it.NEC 2023 Article 90
Continuous load: what time threshold?: Maximum current expected to continue for 3 hours or more.NEC 2023 Article 100 (continuous load)
Grounded conductor versus neutral conductor?: A grounded conductor is any conductor intentionally connected to earth. A neutral comes from the neutral point of a system. A corner-grounded delta phase is grounded but is not a neutral.NEC 2023 Article 100
Terminal temperature rule for circuits of 100 A or less?: Use the 60°C ampacity unless the equipment terminals are marked for 75°C. Above 100 A, use 75°C unless marked otherwise.NEC 2023 Article 110 (terminal temperature limits)
Interrupting rating rule?: Equipment that interrupts fault current must be rated for at least the fault current available at its line terminals.NEC 2023 Article 110 (interrupting rating)
What sets working space depth?: The nominal voltage to ground and the Condition (1, 2 or 3), which depends on what is across the space.NEC 2023 Article 110, Part II
Working space width and height?: Width at least 30 in. or the width of the equipment, whichever is more. Height at least 6½ ft.NEC 2023 Article 110, Part II
Plan scale 1/8 in. = 1 ft: how many feet per inch?: 8 ft. Divide the measured inches by 0.125, or multiply by 8.Plan reading (no NEC section)
First three things to read on an electrical sheet?: The legend or symbol list, the scale, and the general notes. Then the schedules.Plan reading (no NEC section)