Dbravo:
Some verbage from '11 NEC Art 350.30....
"Exception No. 4: Lengths not exceeding 1.8 m (6 ft) from
the last point where the raceway is securely fastened for
connections within an accessible ceiling to luminaire(s) or
other equipment."
Note the words 'accessible ceiling'....
From '11 NEC, Article 100 definitions.....
'Plenum. A compartment or chamber to which one or more
air ducts are connected and that forms part of the air distribution
system.'
This term is widely used as the cavity above a 'drop ceiling' that is used for return airflow, as opposed to a HVAC system with ducted return air.
Hence items like 'plenum rated Cat5/6', etc.
I see no mention of LFMC within Article 300.22.
