Hey guys, as of right now (Jan 2017) the 2014 edition of the national electrical code is still being used for the PE exam.
Seeing as how the 2014 edition wasn't adopted for the PE exam until 2015, chances are the new 2017 edition will not be required until exams beginning next year in 2018.
Two things I'd like to point out:
1. You can actually access the latest version of the NEC online for free directly from the NFPA
2. To verify directly from NCEES which version of the code is currently being used look directly on the exam specifications.
I linked to both of the above, as well as spoke more about this in greater detail (like why you should purchase the handbook over the codebook) in a full-length article published two weeks ago.
If you want the full details you can access it directly here: