Running ethernet cable through walls is the best way to extend a wired network, but it’s not always practical. Powerline adapters offer an alternative that uses your building’s existing electrical wiring to carry network data. Here’s when they’re worth considering and when to look elsewhere.
How Powerline Adapters Work
A powerline adapter pair works by modulating a network signal onto your electrical wiring. You plug one adapter into a wall outlet near your router and connect it via ethernet, then plug a second adapter into any other outlet in the building and connect your device or a switch to it.
The two adapters communicate through the electrical wiring in the walls, the same wiring that powers your lights and appliances, without any additional cabling.
Setup is straightforward: most adapters use a pairing button to establish a secure connection between the two units.
When Powerline Adapters Work Well
In the right environment, powerline adapters perform reliably and deliver speeds adequate for most business tasks; including video conferencing, file access, and VoIP.
Good scenarios:
- A single-storey building on a single electrical circuit
- Extending connectivity to a room where cabling is difficult (through concrete or tiled floors, for example)
- Temporary or semi-permanent installations where cable runs aren’t justified
- Connecting a device in a distant room where WiFi signal is poor
Limitations and Failure Points
Powerline performance is highly dependent on the quality and configuration of your electrical wiring, something you can’t fully assess without trying it.
Common issues:
Electrical circuits. Powerline adapters work best on the same electrical circuit. If the two outlets are on different circuits (which is common in larger buildings, buildings with three-phase power, or premises where circuits have been modified), performance drops significantly or fails entirely. In older buildings, the wiring may be too noisy or degraded for reliable operation.
Interference from other devices. Some electrical equipment (motors, fluorescent lights, UPS units, surge protectors) introduces noise onto the electrical supply that degrades powerline performance. Plugging adapters directly into wall outlets (not power bars or surge protectors) reduces this.
Speed limitations. Advertised speeds on powerline adapters (600 Mbps, 1,000 Mbps, 2,000 Mbps) are theoretical maximums under ideal conditions. Real-world throughput is typically 30–60% of the rated speed, and often less in older or noisier electrical environments.
Distance. Performance degrades over longer electrical runs. Two outlets close together on the same circuit will perform better than two outlets at opposite ends of a large building.
Powerline vs WiFi Extenders vs Ethernet
| Option | Pros | Cons |
|---|---|---|
| Powerline | No new cabling needed, wired reliability | Dependent on electrical wiring quality, variable performance |
| WiFi extender | Easy setup, no cabling | Halves bandwidth, roaming issues |
| Ethernet (structured cabling) | Best performance, most reliable | Requires installation work |
| Mesh WiFi system | Good coverage, easy roaming | Wireless backhaul reduces throughput |
For permanent installations where performance matters, structured ethernet cabling is always the right answer. Powerline and WiFi extenders are pragmatic solutions for situations where running cable isn’t feasible.
What to Look for When Buying
- AV2 standard — current generation; avoid older AV or AV500 adapters
- Gigabit ethernet port — some budget adapters include only a 100 Mbps port, which limits performance regardless of the powerline speed
- Passthrough outlet — adapters with a built-in outlet don’t sacrifice a wall socket
- Multiple ethernet ports — some models include a small built-in switch, useful for connecting several devices at the remote end