Given: A single family residence: The space between floor joists is closed with a galvanized sheet steel and used as a return air plenum. Can a low voltage cable that is not rated for low smoke plenum use be routed along the face of a joist within the enclosed space?

Given: A single family residence: The space between floor joists is closed with a galvanized sheet steel and used as a return air plenum. Can a low voltage cable that is not rated for low smoke plenum use be routed along the face of a joist within the enclosed space?