On September 19, 2017 at 17:13, iimig said...
Somewhat true, but 800.47 explicitly says "underground communications wires" not only "cables entering buildings." It's not only what they say, but sometimes what they don't.
I will have to agree to disagree. 800.110 fits better when dealing explicitly with cables inside of a building. In order for 800.47 to apply, the slab would have to be classified as 'underground' and not inside the building. If the slab is considered inside the building, then the exemption from 800.47 would not apply and the installation methods in chapter 3 would govern our conduits.
I only know all this because a few years ago I did 432 classroom hours of training on the NEC and other NFPA publications for an Oregon Limited Energy A license.
I did my OR LE years ago and while the classes teach a lot, there is always more to learn and not even the AHJ knows it all.
