I've only worked on something similar to this once, and that was an apartment complex rewire.. Shared walls got 4S boxes (or 1900's for you east coasters ) with a 3M pad. All of our NM-B's passing into or through the wall had to be sleeved in FMC with Firestop caulking around the wall penetration. ¾" drywall was used on shared walls as well
![[Linked Image]](https://www.electrical-contractor.net/ubb/biggrin.gif)
) with a 3M pad. All of our NM-B's passing into or through the wall had to be sleeved in FMC with Firestop caulking around the wall penetration. ¾" drywall was used on shared walls as well
