Can I carry power through ethernet cable

Yes, as long as your device supports PoE (Power over Ethernet).

How much current can a CAT6 cable reliably handle?

The IEEE published its IEEE 802.3a Power over Ethernet (PoE) standard to specify how to deliver power over standard Ethernet cables. This allows up to 48 V of DC power to PoE-compliant devices over eight-wire Cat 5 and Cat 6 cables.

A standard CAT5 Ethernet cable has four twisted pairs, but only two of these are used for 10BASE-T and 100BASE-T. The specification allows two options for using these cables for power:

Below table shows the comparison of the industrial digital camera interface standards that provide the single cable solution.

Power over Ethernet calculator ( PoE ) to find Line Loss

The PoE calculator by PoE-Texas calculates the total power required for any device including cable loss by any type or length of cable, over Ethernet or not, it calculates the voltage drop and power required by both the device and the loss in the cable. Since a device is speced for power consumption over a range of input voltages, as the remotely delivered voltage decreases with distance, the amps increase, causing the delivered voltage to decrease further.

PoE Tester

  • PoE Tester/Detector for passive, 802.3af and 802.3at applications, 10/100/1000 data rates
  • Measures and displays Voltage, Current and Power while allowing full ethernet operation
  • 2 independent volt meters, test mode B PoE (pins 45, 78) from 20v to 56 volts
  • Test mode A PoE (pins 12, 36) from 20v – 56 volts or DC power supplies from 5v to 56 volts
  • Expert USA Tech Support – call 512 479 0317


What is a PoE injector?

The IEEE standards for PoE require category 5 cable or better for high power levels but allow using category 3 cable if less power is required. Power is supplied in common mode over two or more of the differential pairs of wires found in the Ethernet cables and comes from a power supply within a PoE-enabled networking device such as an Ethernet switch or can be injected into a cable run with a midspan power supply. A midspan power supply, also known as a PoE power injector, is an additional PoE power source that can be used in combination with a non-PoE switch.

TP-Link Gigabit Ethernet PoE Injector Adapter (TL-PoE150S)

Power Supply: 15.4W (Max. 48VDC) Expands network to areas with no power lines or outlets
Ideal for use with access points and IP cameras
Delivers power up to 100 meters (328 feet)
Two Gigabit Ethernet ports for lightning-fast wired speeds
Auto-detects the required power supply
Plug and Play, no configuration required

 PoE Switch РBV-TECH 8 Port 120W 10/100Mbps Power over Ethernet Switch РDesigned for IP Camera Use(Gray)

  • BV-TECH 8 Port 120W 10/100Mbps Power over Ethernet Switch – Designed for IP Camera Use(Gray)

    8 Ports at 10/100Mbps + 1 Uplink port at 10/100Mbps

  • 150W of Max Power (15.4W Per Port)
  • Complies with IEEE 802.3af PoE Standard
  • Auto-MDI/MDI-X Function for any Port
  • Compact Size