Cat5 or Cat6 for CCTV: UK Installer's Guide 2026

For a new IP camera install, skip Cat5 and treat Cat5e as the minimum. Cat5e supports 1000BASE-T Gigabit, which is more than most cameras can use. Choose Cat6 when PoE load, bundle size or a future upgrade justifies it, and Cat6a only for runs that must carry 10GBASE-T over the full 100 m. The category doesn't tell you whether a cable suits outdoor use or is shielded, so check the jacket and construction as well.

Cat5 or Cat6 for CCTV: what is the quick answer?

Choose Cat6 for new fixed CCTV cabling. Cat5e is adequate for typical Gigabit camera runs, and Cat6a only pays off for 10G or high-PoE specifications.

• Cat5e: fine where the camera and recorder ports run at Gigabit.
• Cat6: the sensible default for any new fixed run.
• Cat6a: for 10G links or high-PoE specs.

What the names mean

"Cat" is short for category, a performance grade for twisted-pair Ethernet cable. This is what the cat5 or cat6 difference looks like in practice:

• Cat5: 100 MHz and 100 Mbps, so obsolete for new work.
• Cat5e: ratified in 1999 (Eaton), still 100 MHz, but rated for 1000BASE-T Gigabit.
• Cat6: 250 MHz, formalised in 2001, with stricter crosstalk and noise limits than Cat5e (Wikipedia). For 10GBASE-T it is limited to 55 m.
• Cat6a: 500 MHz, and it carries 10GBASE-T over the full 100 m.

Most IP cameras are held back by their own port and the NVR or switch, not by the cable. A camera with a 100 Mbps port will not run faster on Cat6.

On paper Cat6 is the faster and better cable, but whether that matters depends on your equipment and run length, which the checklist below works through.

Which five questions decide the cable?

Five questions decide it: camera count and resolution, run length, PoE draw, where the cable runs, and any 10G plans. This is general installer guidance, not a test result.

1. Camera count and resolution. Read each camera's datasheet for its bitrate. High-resolution cameras are usually fine on Gigabit Cat5e, and the switch uplink matters more than the drop cable. Pushes you towards: either category on the drops, with your attention on the uplink speed.

2. Run length. The 100 m (328 ft) channel limit applies to every category, per trueCABLE. Beyond it you need a switch or extender, not a "better" cable. Cat6 only drops to 55 m when carrying 10GBASE-T, per Wikipedia, so that matters only for 10G backbones. Pushes you towards: an extra switch or extender for long runs.

3. PoE draw. Total camera wattage must not exceed the switch's PoE budget, and each camera's class must sit within the 802.3af/at/bt level of its port. Both Cat5e and Cat6 support the standard PoE levels. Pushes you towards: sizing the switch, not the cable category.

4. Where it runs. Category says nothing about indoor or outdoor use, or shielding. Jacket type (for example, UV-resistant outdoor) and unshielded U/UTP versus shielded F/UTP are chosen separately. Pushes you towards: picking jacket and shielding first, then a category within that.

5. Any 10G plans. Cat5e tops out at 1000BASE-T. Cat6 is specified to 250 MHz against 100 MHz for Cat5e, and Cat6A is the grade that holds 10G to 100 m. Plugs, jacks and patch panels should match the cable's category, so a Cat6 patch lead suits a Cat6 run. Pushes you towards: Cat6 for short 10G-ready runs, Cat6A for longer ones.

What is the verdict for each typical UK install?

Cat5e suits small domestic installs, Cat6 suits busier business systems, and Cat6A is the sensible choice for new commercial builds with a long service life.

Scenario	Verdict	Why
Domestic, 2-4 cameras, short runs	Cat5e; Cat6 if the cost gap is trivial	Cat5e is rated for 1 Gbps at 100 MHz over 100 m, per CZT's comparison chart. Cat6 only adds headroom you may never use.
Small business, 4-16 cameras, PoE+ PTZ or ANPR	Cat6	It is held to stricter performance limits than Cat5e (trueCABLE). General guidance: it gives more thermal margin in tightly bundled runs feeding 30 W+ loads.
Retrofit into existing Cat5e	Reuse it if it tests clean at Gigabit for the length needed	A link performs to its weakest component, so plugs, jacks and patch panels should match the category.
New-build or commercial with a long service life	Cat6A	Specified for 500 MHz and 10 Gbps at the full 100 m. CZT says it handles 90 W PoE without overheating.

On a retrofit, test before you replace. RJ45 is the same connector across categories (Taoglas), so a Cat6 plug will physically fit a Cat5e run. That tells you nothing about what the link will deliver.

The PoE reasoning needs care. trueCABLE lists both Cat5e and Cat6 as supporting 802.3af/at/bt PoE up to 100 W DC, so Cat5e is not barred from PTZ or ANPR loads. The case for Cat6 there is margin in bundles, and that part is general guidance rather than a datasheet figure.

Cat6 is not a 10 Gbps answer for long runs. Wikipedia's Category 6 entry notes that Cat6 drops to 55 m for 10GBASE-T, while Cat6A holds 100 m.

For patch ends, a 1 m Cat6 U/UTP lead is rated to 250 MHz. Cable pricing differs by account, so open a trade account to compare the Cat5e and Cat6 gap on your actual quantities.

How do you tell Cat5 from Cat6, and can they be mixed?

Read the category printed on the cable sheath, and yes, the two can be mixed: the link performs to its lowest-rated part.

Telling them apart

Cat6 is often the thicker cable, and many builds include a plastic spline between the pairs. Thickness varies by maker, though, so looks alone are not a reliable test. If the sheath carries no legible marking, treat the cable as unknown rather than guessing.

Mixing Cat5 and Cat6

A Cat5 lead fits a Cat6 jack because the RJ45 interface is the same. Wikipedia describes Cat6 as backward compatible with Cat5/5e, and it specifies Cat6 to 250 MHz against 100 MHz for Cat5 and Cat5e. One Cat5 section in a Cat6 chain therefore holds the whole link to Cat5 performance.

On termination, the spline and thicker conductors can make Cat6 fiddlier to punch down or crimp. Use plugs and jacks rated for the cable you are terminating.

Patch lead or fixed cable

The CAT6/CAT5e RJ45 25 m lead and the 1 m Cat6 U/UTP lead (250 MHz, gold-plated RJ45) are patch leads. They suit equipment connections and short links, not fixed cable runs. Your own installer or electrician should specify the installed cabling.

Where do you buy the cable, and what do you check before ordering?

Buy from a supplier that publishes full cable datasheets, and check five things first: printed category, conductor, sheath, length and PoE budget.

• Category: look for it printed along the jacket, not just in the listing. Whether a run is Cat5e or Cat6 is the first question in any Cat5 or Cat6 cable order.
• Conductor: the datasheet should say whether it is solid copper or a cheaper copper-clad alternative. If it doesn't say, ask before you order.
• Sheath: category tells you nothing about whether a cable suits indoor or outdoor routes. Match the jacket to the route.
• Length: twisted-pair Ethernet is limited to 100 m, and Cat6 drops to 55 m if you run 10GBASE-T.
• PoE: add up the cameras' combined draw and compare it with the switch's total PoE budget. Cat5e and Cat6 are both generally specified for PoE, so the switch is usually the limit.

Euro CCTV supplies trade accounts with no minimum order. In-stock items ordered before 4 pm Monday to Friday are dispatched the same working day, and later or weekend orders go the next working day. Carriers set delivery days. Stock and back-order status are shown live on each product page, and account pricing appears once you sign in. Collection is from our London site at Brent Cross.

For the switch end, the 1 m Cat6 patch lead is a 250 MHz U/UTP lead with gold-plated RJ45s, and the 25 m black CAT6/CAT5e lead covers longer hops.

We supply equipment only. Your own installer fits and tests it, so point them to the product datasheet. Open a trade account at eurocctv.co.uk to see account pricing and live stock.

Related products

Related products from our own range:

• Cat6 vs Ethernet Cable: What's the Difference? — Understand the difference between a generic Ethernet cable and Cat6. This 1m blue U/UTP Cat6 cable offers 250MHz bandwidth & gold-plated RJ45, ideal for CCTV.