There are two different types of fire alarm system circuits, NPLFA and PLFA. NPLFA can operate at up to 600V with unlimited power output. A PLFA has limited voltage and power which is dictated by the listed power source.  Basically this means that there are easier installation requirements for the PLFA circuit, however listed below […]

Many different types of wire and cable products are offered in plenum versions.  This article will explain what a plenum cable is and when it is required to use a plenum cable over a non-plenum one.
A plenum is an area that facilitates air circulation in a building or structure.  It is the area or duct […]