Hooks are normally attached to the structure supporting the drop ceiling (normally the steal beams, not the wire or threaded rod supporing the grid), then cabling run through them. If the drop ceiling ...

When constructing the Empire State Building in 1930, engineers found that the heavy non-armored electrical cable installed in vertical raceways or risers imposed excessive strain on terminations, ...

A. Raceway and cable assemblies must be secured and supported per the requirements in Sec. 300.11. (A) Secured in Place. Raceways, cable assemblies, and enclosures ...