UL 1449 is the Underwriters Laboratories Safety Standard for Surge Protective Devices (SPD). Surges are rapid increases in voltage and current that can occur on AC or DC power circuits that can damage equipment attached to these circuits. An example of a surge would be a lightning strike on or near exposed power lines. The strike can induce voltages on the power line that can exceed a million volt.
Positive train control and other smart technologies are transforming how the rail industry operates. All of these systems require reliable power for seamless and continuous operation, as well as for the guaranteed safety of trains and travelers.
Cisco recently unveiled global mobile data statistics and projections for the next four years, and the numbers reveal what we all know—data usage continues to grow significantly, emphasizing the absolute necessity of reliable networks.
There’s no shortage of options when it comes to surge protection. It may be difficult to tell the difference among products and systems, and what type of surge protection device (SPD) is right for the application. Here are a few and notes to help sort what’s out there.