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 ceiling power distribution systems (CPDSs) solve several problems. In recent years, the once-rare low-voltage devices have become ubiquitous, and the sheer number of low-voltage applications (see What’s It For?) greatly complicated the installation job. Avoiding “rats nest ...

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