Quick Answer
For camera work the deciding factor between Cat6 and Cat6A usually is not bandwidth, it is heat. Cat6 is the sensible default for modest PoE on short-to-medium runs. Move to Cat6A when bundles exceed roughly two dozen powered cables, runs push past 70 m, or the PoE budget is at 30 W and climbing.
Bandwidth Is Not What Breaks Camera Runs
Most people compare Cat6 and Cat6A on bandwidth, conclude that a 4K camera does not need 10 Gigabit Ethernet, and buy Cat6. The reasoning is sound and the conclusion is frequently wrong, because bandwidth is not what breaks camera runs. Heat is.
Where the Heat Actually Comes From
Power over Ethernet pushes current down the same conductors carrying data. Current through resistance produces heat, and cable inside a bundle has nowhere to dump it — the cables in the middle are insulated by the ones wrapped around them. TIA published TSB-184-A specifically because installers kept seeing this failure mode: bundles that certified clean on a cold morning, failing once the system was under load.
The penalty is measurable rather than theoretical. Insertion loss rises roughly 0.4 percent for every degree Celsius above 20 °C. A ten-degree rise in the middle of a bundle costs about four percent of your loss budget, and on a run already sitting near 90 m, four percent is the margin between a pass and a fail.
Why Conductor Gauge Decides It
Cat5e is typically 24 AWG. Cat6 and Cat6A are typically 23 AWG. That single step is roughly twenty percent less DC resistance per conductor, which means less heat generated for the same delivered wattage. Cat6A goes further: thicker insulation and a separator spline hold the pairs physically apart, giving heat more escape path and simultaneously cutting alien crosstalk between neighbouring cables in a dense bundle.
The Numbers on a Real Bundle
Consider forty-eight cameras at 30 W, pulled as a single bundle through a ceiling into one IDF. On Cat5e, the core of that bundle can climb ten degrees or more above ambient; in a 30 °C ceiling that is 40 °C copper, and you are derating length to stay inside spec. On Cat6, the same bundle runs meaningfully cooler and most drops certify without argument. On Cat6A you still have headroom for the day somebody adds heated PTZ enclosures and every port jumps to 60 W.
Comparing the Three Honestly
| Bandwidth | 10 Gigabit | Conductor | Where it belongs | |
|---|---|---|---|---|
| Cat5e | 100 MHz | No | 24 AWG | Legacy patching, low-power fixed cameras, short runs |
| Cat6 | 250 MHz | To 55 m | 23 AWG | The sensible default for camera and access drops |
| Cat6A | 500 MHz | Full 100 m | 23 AWG | High PoE, dense bundles, anything meant to outlive the cameras |
When Cat6 Is Genuinely the Right Call
Short runs, modest PoE loads, small bundles, and a budget that has to mean something — Cat6 is a completely professional choice and it moves in volume for good reason. The upgrade argument only becomes compelling under specific conditions: bundles past roughly twenty-four powered cables, runs beyond about 70 m, a PoE budget already at 30 W per port, or a hot ceiling.
The Ninety-Metre Reality
The 100 m figure everyone quotes is 90 m of solid horizontal cable plus 10 m of patch cords split between both ends. Design to 90. If your longest run measures 95 m on the reel before it reaches the jack, the answer is not a better cable, it is a different plan: an intermediate switch, a zone box, or fibre.
What You Are Really Buying
You are not choosing cable for the camera going up this month. You are choosing it for whatever hangs on that drop in eight years, when the resolution has doubled, the analytics run at the edge, and the enclosure has a heater. Re-pulling a finished ceiling costs several multiples of what the better cable would have cost, and the labour is the expensive half.
FAQ
Does Cat6A require different connectors?
Yes. A Cat6A cable terminated on Cat5e jacks is a Cat5e channel. Component category has to match end to end, or the weakest part sets the rating.
Is shielded cable a substitute for Cat6A?
No, and it introduces a new obligation: a shield needs a bonded path to ground at the correct end, or it collects interference with nowhere to send it.
Can I mix Cat6 and Cat6A in one install?
Yes, and it is often the economical answer — Cat6A on long, high-power or heavily bundled runs, Cat6 on short interior drops. Document which is which so the next technician is not guessing.
Updated August 2026