Continuous Loads and the 125% Rule
4:51
A load that runs three hours or more gets its own sizing rule, and that one word, continuous, changes the whole calculation for both the conductor and the breaker.
In this lesson: the 3-hour continuous load definition, continuous vs noncontinuous examples, the 210.19(A)(1) branch circuit formula with a worked example, why the breaker needs the same 125% treatment (210.20(A)), the rare 100%-rated equipment exception, the 215.2(A)(1) feeder version with its own worked example, why EV charging equipment is always continuous by definition (625.41), the 125%-vs-80% math shortcut, the common mistake of multiplying the wrong portion of the load, and why motor circuits use Article 430 instead of this formula.
