A new UL 4299 certification for HDBaseT cables, called PoH (Power over HDBaseT) Cable Certification, establishes requirements for PoH cables. Under this certification program, UL tests cables in accordance with UL 4299.

PoH is similar to PoE (Power over Ethernet), but has unique features specific to professional AV installations that involve HDBaseT.

Why UL 4299 Certification?

Why does PoH require UL 4299 certification? For two reasons:

  1. To guarantee fire safety
  2. To guarantee cable performance

When power is run on a twisted-pair cable, the amount of heat generated inside the cable increases – especially in cable bundles – and this can cause safety and performance issues (cable performance will degrade as temperature rises).

The new UL 4299 certification ensures that your AV installation will meet robust safety and performance requirements while successfully transmitting HDBaseT signals – including 100W of power delivery.

Why is PoH Important?

The ability to remotely power devices provides enormous flexibility when positioning or moving devices around your AV network. Why? Because the location of local AC power is no longer a constraint. You can place devices wherever you’d like, regardless of whether or not AC power is nearby.

PoH is primarily used today to power HDBaseT transmitters and receivers. In the future, however, we know that PoH holds the ability to remotely power a whole host of devices, such as TV screens, projectors and monitors.

UL 4299 Certification Testing

The test administered to cables for the new UL 4299 certification is quite stringent, which should give you peace of mind when selecting PoH cables.

There are two parts to the test:

  1. A cable heating or safety test. Very similar to the UL Limited Power or LP test, this cable heating test is designed to measure the worst-case scenario of a bundle of cables wrapped through conduit that is filled with insulation at each end. At one end, all conductors are connected to a power supply that provides 0.5 amps of power at 50V, which is equivalent to 100W of power. Thermocouples measure the innermost cable. If the temperature does not rise past the temperature rating of the jacket after three tries, then the cable has passed.
  2. The performance test. This is where PoH differs substantially. The performance test determines whether the cable can still pass the HDBaseT recommended cable test while subjected to the elevated temperature measured during the cable heating test. Not only does PoH ensure safety, but it also ensures performance while transmitting 100W of power.

When you choose cables with this new PoH certification, you can be certain that your cabling infrastructure will be ready for content delivery (including 4K) and power requirements.

Belden is one of the first cable manufacturers to achieve this new UL 4299 certification. Be sure to look for the UL PoH certification when you select an HDBaseT cable. Belden’s new 4K UHD Media Cables, 2183P and 2183R, are among the first HDBaseT-recommended cables with this new UL 4299 certification.

To learn more about HDBaseT or Belden’s PoH certification, visit info.belden.com/HDBaseT.

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