Solved by hand · NEC 314.16(B)
How many cubic inches does a device box need?
The problem
A device box contains six 12 AWG circuit conductors, two 12 AWG equipment grounding conductors, and one switch connected to 12 AWG. What minimum box volume does the code require?
Grab a pen and paper first
Give it a real try on paper before you watch. That is how it works at PSI. If you get stuck, take a hint. If you go blank, that is fine, press play and it gets walked through with you.
Watch it solved, with you
Every step is written out slowly and explained in plain words, so you always know what just happened. Nobody skips ahead and leaves you behind.
Press play and it gets written out with you, one small step at a time.
Every step gets a plain-words explanation here, so you always know exactly what just happened and why.
Now find out if this pattern would cost you points.
The free 15-minute practice test checks this pattern and the rest of the exam's calculation families, then shows what to study first. No signup, no card.