Ran into this one regarding "OPEN Cables"
The Electrical Code: No Problem, unless a special classified area such as Explosion Proof and like ProCircuit stated Fire Seperations...
However, the building code (local building Inspector) caught us with Flame Spread of cables, he wanted FT6 rated cables installed or in conduit, as where the cables were run was classified as a "Return Air Plenum for the HVAC (we were running in "T-bar Ceiling).
