Among the revisions in the 2014 NEC are some new Articles, one of which is Art. 393. As with most Chapter 3 Articles, this one exists to address a particular type of product. Low-voltage suspended ...

For most applications, ceilings are finished with drywall, mud and tape... along with the walls. However, in some instances, closing up the ceiling with drywall is neither practical nor a possibility.

Suspended ceilings in commercial buildings have grown in purpose and importance over the past few decades. At one time, they provided a grid for installing fluorescent troffers and created an overhead ...