when wiring any structures whether its a wood house or a high rise in northern virginia, maryland and washington d.c. we must firestop -any -penetrations that go from one floor to the next or through any fire rated walls with rockwool or fire caulk. even small ones such as holes for romex,mc,emt,rg6 and cat5. the electrical inspector enforces this and will fail you for it. as well as any fire mashall or building inspector
