On Sun, 09 Apr 2017 01:20:14 -0400, wrote:

Insurance companies like to see that all wiring is/was up to code if they are to pay a claim for any future damages.
No code for class 1 or class 2 12 volt wiring.

Perhaps you should take a peek at article 725.
BTW "class 1" can also include 120v wiring (up to 600v) and from a
life safety standpoint, there is no significant difference. That is
why Class 1 circuits use chapter 3 wiring methods.
Don't confuse Class 1 with Class 2 or Class 3 but all are covered by
the code.