How Does a CCTV Surveillance System Work? Complete FAQ for Buyers

How does a CCTV surveillance system work?

CCTV (Closed Circuit Television) systems use security cameras to capture video footage, which is then transmitted to a monitor or a recording device such as a DVR or NVR.

The cameras send the captured video data to the recorder. The recorder then:

- Transmits the live feed to a connected monitor

- Records the footage onto a built-in hard disk

- Connects to a router, which allows remote viewing over the internet

This networking capability is what lets you access your camera feed from any computer, iPhone, or Android device, no matter where you are.

**What warranty do your CCTV products have?**

Our CCTV systems come with a standard warranty of **24 months**, covering both parts and labour.

Over the years, we have tested and rejected many inferior products. At Gcraftsmantech, we only supply cameras and NVRs that meet strict quality and reliability standards, which is why we are confident backing them with a full 24-month warranty.

**What is the difference between a DVR and an NVR?**

A **DVR (Digital Video Recorder)** records footage from analog cameras, while an **NVR (Network Video Recorder)** records footage from IP cameras over a network.

NVR systems generally support higher resolution cameras, PoE cabling, and more advanced video analytics such as human and vehicle detection.

At Gcraftsmantech, we focus on NVR-based IP camera systems for new installations, as they deliver superior image quality and future-proof scalability.

**How many CCTV cameras do I need for my property?**

The number of cameras you need depends on the size of the property, the areas you want to monitor, and your specific security goals.

As a general guide:

- A single-storey home typically needs **4–5 cameras** to cover all entry points and perimeter areas.

- A larger double-storey home or commercial property usually requires **6–8 cameras** or more.

If you are unsure, tell us your property size and key monitoring areas, and we will recommend the right camera count and lens options.

**Should I choose a wired or wireless CCTV system?**

For a permanent multi-camera system, **wired IP cameras** are usually preferred because a stable Ethernet cable can carry both data and power through Power over Ethernet (PoE). This reduces dependence on Wi-Fi coverage and provides a reliable, uninterrupted connection for continuous recording.

Wireless cameras can still be a good option where running cables is difficult or only limited coverage is needed. Note that "wireless" does not always mean completely wire-free — most cameras still require a power source. The decision should be based on reliability, existing infrastructure, installation constraints, and the amount of video traffic your system must carry.

**Does CCTV reduce damage from floods and fires?**

CCTV itself does not stop a fire, detect every water leak, or replace dedicated fire, smoke, heat, or water-sensing equipment. Its primary role is visual coverage and recorded evidence.

That said, cameras can provide useful visual information before, during, or after an incident. Compatible NVR systems can also tag footage with events triggered by external sensors. If early fire or water detection is a critical requirement, dedicated life-safety equipment should be used alongside your security camera system, not as a replacement.

If you are planning a CCTV project, contact us with your requirements — we will recommend the right camera types, storage capacity, and system architecture for your application.