Powerline Adapters: Internet Over Your Electrical Wiring — When They Save the Day, Why Speed Is Lower Than Promised and What Gets in the Way

Sometimes running a network cable is impossible — fresh renovation, concrete walls, a rented flat — and Wi-Fi doesn't reach the room you need. That's where powerline adapters help: they carry the internet over the ordinary electrical wiring. One adapter plugs into a socket next to the router, the other into the room you need, and a network port or Wi-Fi appears there. It sounds perfect, but the result depends very heavily on the wiring. Let's look at how they work, how much they really give and how to connect them properly.

How it works

The adapter mixes a high-frequency data signal into the alternating current in the wires. A second adapter in another socket extracts that signal and turns it back into a network connection. The adapters form their own encrypted network — they're "paired" with a button when first installed. Many models have a pass-through socket, several network ports or their own Wi-Fi access point.

Real speed

Boxes say 600, 1200 or 2000 Mbit/s, but that's the theoretical speed of the physical link in ideal conditions. Real data throughput is usually 3–5 times lower: 50–300 Mbit/s on good wiring, and 10–30 on old wiring. Speed can also vary through the day as the fridge, washing machine or heater switch on. That's enough for video, work and most tasks, but don't expect a gigabit connection.

What affects the result

• The state of the wiring. Old aluminium wires, twisted joints and long runs degrade the signal. In Tbilisi's older buildings this is a common cause of low speed.
• Different phases and circuit breakers. If the sockets are on different phases or different distribution boards, the signal weakens badly or doesn't get through.
• Extension leads and surge protectors. A surge protector suppresses the high-frequency signal as interference. The adapter must plug straight into a wall socket.
• Interference from appliances. Switch-mode power supplies, chargers, LED bulbs and appliance motors create noise on the wiring.
• The meter and RCD. The signal usually doesn't pass through the electricity meter, so neighbours can't see your network — but nor will it link two flats.

When powerline is a good solution

• You need to connect a TV, set-top box or computer in a room Wi-Fi doesn't reach and a cable can't be run to.
• The flat is rented and running cables isn't allowed.
• You need to get the internet to the upper floor of a house where the floors block Wi-Fi.
• As a temporary fix until a cable can be run.

When something else is better

• A network cable — always more reliable and faster if it can be run.
• A mesh system — if you need Wi-Fi coverage throughout the flat, not just one spot.
• Old or problematic wiring — powerline may be unstable, and the money wasted.
• Online gaming — powerline adds latency and can be unstable under load.

How to connect them properly

• Plug the adapters directly into wall sockets, not extension leads or surge protectors.
• If you need a surge protector, choose an adapter with a pass-through socket and plug the protector into that.
• Use adapters from the same manufacturer and standard.
• Pair the adapters so encryption is enabled — without it, the network may be visible to neighbours on shared wiring.
• Try several sockets — speed can differ several times over.

Safety

Powerline adapters run on ordinary mains power and are safe when used correctly. But if a socket gets hot, sparks or the wiring is damaged, you need an electrician first. Don't cover the adapters with furniture — they get warm while running.

What our technician does

1. Assesses whether a cable can be run and compares the options: cable, mesh or powerline.
2. Checks the wiring and the speed between the sockets you need.
3. Selects adapters with the right ports and Wi-Fi, and pairs and sets them up.
4. Connects the TV, box or computer and checks stability.
5. Brings in an electrician if the wiring is problematic.

A real example

A family in a house in Kojori couldn't watch TV upstairs: Wi-Fi barely got through the concrete floor, and they didn't want a cable run over the freshly renovated staircase. Our technician tested several pairs of sockets and found ones on the same phase. We installed a pair of powerline adapters with pass-through sockets: one by the router, the other by the TV, connected by cable and with built-in Wi-Fi for the upper floor. Speed came to about 150 Mbit/s — enough for 4K video and work — and the TV stopped freezing.

Before buying, it helps to know which phases the sockets you need are on. Flats usually have a single phase, so there are fewer problems, but in houses and older buildings with a three-phase supply the sockets in neighbouring rooms may be on different phases — and then the signal barely gets between them. Sometimes moving the adapter to another socket in the same room helps. A good seller will let you return adapters that don't work with your wiring — worth checking beforehand, since nobody can predict the result in advance.

Call a technician

If you need internet in a room Wi-Fi doesn't reach, we'll come to any district of Tbilisi and its suburbs around the clock. Learn more on our Wi-Fi setup, network cable installation and electrician services pages.