What's the maximum PoE cable length for CCTV cameras?

IEEE 802.3 caps any Ethernet run at 100 m end-to-end (PHY layer). Standard PoE (Type 1, 15.4 W) typically works fine to ~90 m on Cat6 — beyond that voltage drop pushes the camera below the 37 V PD minimum. Higher-power Type 3/4 (60-90 W) drops the practical limit to ~60-70 m. Use a PoE extender or fiber for longer runs.

Should I use Cat5e, Cat6, or Cat6a for PoE cameras?

Cat5e (24 AWG) works for 4MP cameras on short runs — cheapest but highest voltage drop. Cat6 (23 AWG) is the mainstream choice — 40% less voltage drop, suitable for 8MP and full PoE+ at 90 m. Cat6a (23 AWG shielded) handles 10G future-proofing and 90 W Type 4 PoE at long runs — required for new commercial installs in many EU jurisdictions.

How do I calculate PoE voltage drop?

V_drop = I × R × L, where I = power ÷ 48 V, R = loop resistance per meter (Cat6 = 0.118 Ω/m), L = cable length. Example: 15.4 W camera at 100 m on Cat6 = (15.4/48) × 0.118 × 100 = 3.8 V drop — well within the 11 V budget. 90 W Type 4 at 100 m on Cat6 = 22 V drop — won't work, needs Cat6a or shorter run.

How much extra cable should I buy for slack?

Add 10% to total calculated length for slack: service loops at each end, mistakes during pull, and a re-terminate budget. For 800 m of camera runs, buy a 1000 m (3× 305 m) supply. Pulling cable twice is far more expensive than buying one extra reel — and unused Cat6 has resale value to other installers.

What if a single run exceeds 100 m?

Three options ranked by cost: 1) Move the camera (cheapest, usually feasible by 5-10 m). 2) PoE extender — typically €60-€150, repeats the signal and re-injects power. 3) Fiber media converter pair (€200-€400) — only option above ~200 m, also gives EMI immunity for industrial sites. Always preferred to route through a closer switch if available.

PoE kaabli pikkuse kalkulaator

Kokku Cat5e/Cat6/Cat6a vajalik, pinge languse teostatavus pikimale tõmbele ja odavaim ümarpaketi kombinatsioon ostmiseks.

✓ See kalkulaator on tasuta kasutada - Krediitkaardiga registreerumine pole vajalik

Kaamerad (või PoE-seadmed): 8

Keskmine jooksu pikkus: 35 m

PoE lülitist kuni igale kaamerapaigale. 25-40 m on tüüpiline elu jaoks, 40-60 m ärilisteks.

Pikim üksiku tõmme: 60 m

Kaabli tüüp

PoE võimsuseklass

Kaabli plaan

Kokku kaabel vajalik

308 m

280 m tõmbe + 28 m vaba ruumi (10% teenustus tsüklite ja taaspaigaldamiste jaoks)

Pinge langus eelarves — pikim tõmme on teostav

Pikim tõmme on 60 m umbes 2.3 V langusega. Praktiline piir selle kaabli + võimsuseekraani juures: 100 m.

Soovituslik ümarpaketi ost

1× 305 m Cat6€290

1× 100 m Cat6€110

Kokku ostetud: 405 m€400

Seotud artiklid

Süsteemi eelarve kalkulaator →

Kaabel on üks rida — näete täispaigalduse maksumust

Kaamera koguse kalkulaator →

Kaamera kogus × keskmine jooks = kogu kaabli pikkus

UPS kalkulaator →

PoE lüliti varustaaegvõimsus — kogu süsteemi koormus

CCTV kaablite juhend

Kaabeltüübid, PoE klassid, pingejagu sügavuses

PoE versus WiFi kaamerad

Kui juhtmeta ületab juhitud (ja millal see ei tee)

Võrgu planeerimine

VLAN, PoE eelarved, IP aadresside — kaabel väljaspool

Kaart iga kaablitõmbe oma plaanile

Kaablid auto-marsruudivad kaamerapaigast lülitini — BOM agregeerib kogu meetrid ja lipustab igat tõmmet, mis ületab teie PoE-klassi eelarve.