Low-Voltage Cabling: Data, Intercom, CCTV

How to plan data, TV, intercom, CCTV and alarm cabling during a renovation, where to put the comms cabinet and how to leave room for the future.

Everyone thinks about power circuits in a renovation, but internet, TV, intercom and camera cables are often left until the last moment. The result is a router sitting on the hallway floor, weak Wi-Fi in the bedroom and a camera cable dangling down the facade. These are known as low-voltage systems, and they deserve to be planned at the same stage and with the same care as the electrics.

What low-voltage systems include

A typical list for an apartment or private house:

computer network and internet (Ethernet cabling, Wi-Fi access points);
TV cable or satellite dish line;
audio or video intercom;
CCTV cameras;
security and fire alarm sensors;
control lines for smart home devices, audio systems and motorised curtains.

Each has its own cable, connection point and often its own equipment. Listing them in advance helps determine how many cables are needed and where they run.

When making the list, think beyond today's needs to changes likely in the coming years. As children grow, desks and computers appear in their rooms, working from home becomes a habit, and the TV moves from one room to another. In a room without cabling, these changes end up relying on weak wireless or surface-mounted trunking.

The hub: a comms cabinet or niche

Bringing all low-voltage lines to one point is both tidy and easy to manage. That point houses the provider's incoming line, the router, a network switch, the video recorder and the intercom unit. In a flat this is usually a small niche or wall cabinet in the entrance area or a wardrobe.

When choosing the location, consider that:

equipment generates heat, so a fully enclosed, unventilated space is unsuitable;
several power sockets are needed inside;
the distance to the provider's cable entry into the building should be short;
Wi-Fi is weakened by a metal cabinet door and thick walls, so wireless access points are placed separately.

Wired internet and Wi-Fi

Wireless is convenient, but walls, especially concrete and brick, weaken the signal. A single router may not cover a large flat or multi-storey house. The most reliable solution is several wired access points, placed on the ceiling or high on walls and cabled back to the central cabinet.

It is also worth running a data socket directly to fixed locations such as the TV, desk or games console. A wired connection beats wireless for speed and stability, and the difference shows during video calls.

Intercom and CCTV

The indoor intercom panel usually goes near the front door, sometimes with an extra panel in the kitchen or on an upper floor. Its line connects to the building system or, in a private house, to the call panel at the gate. If door release is planned, that needs its own cable too.

Cables for CCTV cameras must be run before facade or interior finishes. Modern IP cameras often receive both data and power over a single network cable, which simplifies installation. Camera views should not cover neighbours' private property; that is both an ethical and a legal matter.

Keeping them apart from power cables

Low-voltage cables should not share a conduit with power cables or run tightly alongside them. Electromagnetic interference from power lines can disrupt signals. The lines run in separate conduits, ideally with some distance between them, and cross at right angles where they meet.

Spare capacity for the future

Technology changes, and a line you do not need today may be needed in a few years. To avoid chasing walls again:

leave empty conduits or conduits with draw wires along main routes;
plan at least one data point in every room;
run a wide conduit from the TV area behind furniture or the wall so new cables can be added;
label every cable at both ends and keep a route drawing.

Zaferoğlu İnşaat runs power and low-voltage cabling to a single coordinated plan in apartment and office renovations. Mark TVs, desks and camera spots on the furniture plan, and we will tie the low-voltage points to it.

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