Free PDF · print it, learn it, dump it on scratch paper
The NEC formula card that goes in your head, then on your scratch paper.
Every formula and counting rule the two-part exam leans on, on one printable page, with the memory hooks that make them stick on page two. The move: learn the card cold, then write it from memory in the first two minutes of the exam, before question one.
Every exam formula on one page
Voltage drop, power, motors, transformers, box fill, conduit fill, pull boxes, dwelling loads, the 83% service rule, and the HVAC nameplate rule.
The memory hooks
GEC follows the service. Grounds share a seat. The electrons walk both ways. Page two makes every formula stick for good.
Built for the scratch paper dump
Learn the card cold, then write it from memory in the first two minutes of the exam. The pressure cannot take what is already on paper.
The traps, named
The forgotten round-trip 2. The double 125%. Rounding conduit fill up. Each one called out where it lives.
Get the formula card
Two pages, printable, free. We also send the weak-spot study system to the same email, and you can ignore it if the card is all you wanted.
Want to see every formula on the card actually used? All 12 calculation patterns are solved by hand, free. And the free 15-minute practice test tells you which of them would cost you points.