CCA vs Pure Copper Ethernet Cable: The Hidden Cost of a Cheap Network Cable

Updated August 2026 · Structured cabling

Some cables sold as Cat6 or Cat6A are unusually cheap because their conductors are not copper. CCA—copper-clad aluminum—has an aluminum core with a thin copper layer. It may look like copper, and a short link may even negotiate at 1 Gb/s. Neither fact proves that it is suitable for standards-compliant building cabling or Power over Ethernet (PoE).

The short answer

• Use solid bare-copper horizontal cable for permanent balanced-twisted-pair building cabling.
• CCA has higher DC resistance than a comparable copper conductor; that increases voltage drop and heat when PoE is used.
• A “Cat6” marking, a speed test over a few meters, or a copper-colored cut end is not proof of compliant channel performance.
• Verify conductor material, manufacturer traceability, safety listing, DC loop resistance, and field certification before accepting a project.

Why CCA costs less—and why that does not settle the engineering question

Aluminum is lighter and normally less expensive than copper. Replacing the conductor core with aluminum reduces material cost. The sales pitch often relies on skin effect or a short throughput demonstration. That is incomplete. Ethernet cabling is not evaluated only as a high-frequency signal path: DC resistance, resistance unbalance, insertion loss, termination quality, mechanical durability, temperature, and PoE power delivery all interact in one channel.

CCA is not a universally prohibited material in every industry and application. The relevant question is narrower: whether a CCA product can substitute for the copper balanced cable specified for a structured-cabling channel. A link that comes up is not the same as a channel that meets the required transmission, power, safety, and long-term reliability conditions.

Resistance, voltage drop, and heat

Voltage drop rises with current and resistance (V = I × R), while resistive heat rises with the square of current and resistance (P = I²R). Compared with copper of the same size, aluminum has materially higher resistance; Fluke Networks describes aluminum as roughly 55% more resistive than copper. The exact result for a finished CCA cable depends on conductor size, copper thickness, length, construction, temperature, bundling, and installation. The direction of the effect is not in doubt: more resistance leaves less voltage at the powered device and creates more heat in the cable.

Why PoE makes the risk larger

PoE turns the data cable into a power path for cameras, access points, phones, access-control devices, sensors, and lighting. A short, lightly loaded CCA run may power a device. That is a weak test. As the channel gets longer, the device load rises, cables are bundled, or ambient temperature increases, voltage margin shrinks and temperature-related loss becomes more important. High-power PoE designs should explicitly assess conductor material, DC loop resistance, DC resistance unbalance, bundle size, temperature, and the required delivered power.

Condition	What to check	CCA concern
Long channel	Channel length and DC loop resistance	Less voltage margin at the device
Higher-power PD	Power class and current	I²R heat rises quickly
Large bundle	Ambient temperature and derating	Heat accumulation can worsen loss
Uneven pairs	Resistance unbalance	Unequal current sharing

Data performance and mechanical reliability

Category performance is not proved by an LED or a consumer speed test. A compliant link is assessed with defined parameters such as insertion loss, return loss, crosstalk, length, DC resistance, and resistance unbalance. A five-meter test cannot validate a 90-meter permanent link plus patch cords, especially with PoE and a full cable bundle.

Aluminum-based conductors may also be less tolerant of bending, pulling, and insulation-displacement termination. Faults can appear later as intermittent drops from 1 Gb/s to 100 Mb/s, camera reboots at night when power rises, or failures when a patch lead is moved. Those symptoms waste time because teams often blame the switch, firmware, or end device first.

Acceptance checklist

1. Require the data sheet to state solid bare copper; do not accept vague terms such as “copper coated.”
2. Match the manufacturer, exact part number, jacket marking, packaging label, and lot information.
3. Verify any safety or performance listing against the listing body’s database.
4. For installed links, require permanent-link or channel certification appropriate to the design, including DC parameters for PoE work.
5. When material is in doubt, combine documentation review with cut-end inspection and resistance measurement; no single quick check is conclusive.

Bottom line

The apparent saving from CCA is often a transfer of cost into troubleshooting, re-termination, ceiling access, replacement work, and downtime. For permanent Ethernet building cabling—especially where PoE or long service life is expected—specify and verify pure copper. Do not let a printed category label replace material verification and field evidence.

Sources

• Fluke Networks, Copper Clad Aluminum Cabling
• IEEE, IEEE 802.3bt
• TIA, ANSI/TIA-568.2-E announcement