Installing a socket with integrated USB port: connecting it safely
A socket with an integrated USB port charges your phone, tablet or earphones without a bulky adapter, while keeping a standard socket for everyday appliances. This mechanism fits into a standard 60 mm flush box and replaces an existing socket with no structural work. This guide explains how to choose it and connect it properly.
Choosing your USB socket: the charging power
Check the charging power stated on the packaging: a socket offering 2 × 2.1 A (about 10 to 15 W in total) is enough for a smartphone, while 30 W or more suits tablets and fast charging. Beware of slow-charging models, which only maintain the battery level. Choose a model compliant with French standards (NF marking) and suited to the depth of your flush box, at least 40 mm.
Switching off the power and removing the old socket
Safety comes from switching off the power at the circuit breaker, then checking the absence of voltage with a tester. Nothing must be touched until the tester has confirmed the wires are dead. Then unscrew the plate and mechanism of the old socket.
- Switch off the circuit breaker for the relevant circuit in the consumer unit
- Check the absence of voltage with a voltage tester on the old socket
- Unscrew the plate and mechanism of the old socket
- Identify the wires: live (red, brown or black), neutral (blue) and earth (green-yellow)
- Photograph the wiring before removing so you can redo it identically
Connecting the new socket
Connect the wires to the terminals the same way as on the old socket: the blue neutral on terminal N, the live on terminal L and the green-yellow wire on the earth terminal. Strip each wire to 8 to 10 mm and tighten the screws firmly. Once the three wires are connected, refit the mechanism into the box pushing the wires to the back, then screw on the plate.
Precautions and mistakes to avoid
- Working without switching off the circuit breaker or checking the voltage with a tester
- Swapping the live and neutral: the socket works but the appliance stays live on standby
- Forgetting to connect the earth in a damp room
- Choosing a low-power USB socket to charge a tablet: very slow or no charging
Installing an integrated USB socket is within reach of any careful DIYer, provided the power cut and the tester check are done rigorously. Choosing the power and respecting the wire colour code guarantee fast charging and a safe installation. You gain an elegant wall charger that frees up the standard sockets in your home.