Is Mc Cable Plenum Rated?

Yes it is rated for a plenum ceiling-- as it is called. It also can traverse an actual duct plenum.

How do I know if a cable is plenum rated?

Ratings ending in P designate that the cable is plenum-rated as well allowing it to be used in plenum areas. Plenum-rated cables are more resistant to fire then normal cables.

What is a plenum rated cable?

Plenum rated cable has a special insulation that has low smoke and low flame characteristics. Plenum cable is mandated to be installed in any "air handling" space. ... This qualifies this ceiling as a plenum ceiling, and all the cables that go through that ceiling must be plenum rated.