Some may also not realize that while PoE is considered a safe, low-voltage Class 2 circuit per the NEC®, not all Class 2 circuits are PoE—there are plenty of other Class 2 power applications where power is delivered from a DC power source over two conductors (positive and negative) to devices, such as thermostats, door bells, non-PoE LED lights, cameras and more. The copper conductors in a hybrid copper-fiber cable can be used to deliver this non-PoE Class 2 power. Some hybrid-fiber cables can also distribute Class 3 DC power to active equipment, lighting grids, commercial sound systems and life safety and security systems that require more power than Class 2 can deliver.
If you’re familiar with PoE, you’re probably aware that certifying your twisted-pair category cable per industry standards is enough to tell you that you will be able to support PoE. You can also test PoE on an active network using a simple tester like Fluke Networks’ MicroScanner PoE that displays the power level at an outlet or switch port, along with the data transmission speed of the connection. It can also be used to test the PoE coming from devices that are powered via non-PoE Class 2 circuits, such as an ONT. The MicroScanner is also ideal for showing the distance to a break or short in the event that the cable is damaged.
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