NTC Blue Book Low Voltage Systems Handbook – 2020



Low Voltage System: The systems contracting industry is a subset of the electrical contracting industry.  Typically, systems operate on low voltage (something less than 110 volts).  It is common for systems contracting to have specific licensing requiements.  There are many different system types.  In this book we will discuss the four core competency systems, as well as several other commonly installed systems.