Stingray,

Yes, you are right - the NEC can be difficult to understand without some instruction. If you'll allow Me a plug here, We have several similar titles in the ECN store here, 1 costs a little less, and 1 is a little more than the $45 you quoted.
https://www.electrical-contractor.net/The_Store/Craftsman/CR1999Illus_Intro.htm
https://www.electrical-contractor.net/The_Store/MHE/Understand1999NEC.htm


Bill

Bill