Specialist Security
Welcome to ACT Electrical & Security

Our CCTV Systems

This brief guide will help you understand the basic elements of a typical CCTV system.

It is important that we choose the correct type of camera for each specific installation. Due to specifications of CCTV camera's varying enormously, we select cameras and lenses that offer the best quality picture for your specific environment. We also ensure this is achieved inline with your budget requirements, hence ensuring you get the best picture possible for your money.

Traditional Cameras

These cameras sometimes called body cameras, C cameras or 1/3 cameras (due to the size of the CCD element) are still widely used. They come in many shapes and sizes but generally follow the form of the camera displayed. Many types of lens can be used to complement the camera and many advanced options let the installation technician change the settings to best suit the environment in which they are placed. Outside these cameras are fitted in larger more obvious heated housings.


Dome Cameras

Many types of Dome cameras now exist, but fundamentally any camera that is encased in a spherical housing is classed as a dome camera. Theses cameras offer the advantage of been virtually maintenance free and importantly hide the angle and position of the camera they contain. Dome cameras are quickly becoming the number one choice for shops, pubs, and schools.

Bullet Cameras

Bullet Cameras tend to have fixed lenses that do not require manual focusing and are manufactured in many styles. Usually waterproof and optimized for exterior use, they are a suitable choice for most domestic properties and some small businesses. Over the past year these types of camera have become more technically able and can now offer a quality alternative to the traditional C camera. Many newer models also come equipped with IR illumination.

PTZ Cameras

PTZ stands for Pan Tilt and Zoom; these cameras and special housings are usually installed where a system will be manned by staff or security guards. They allow the user to control the exact position of the camera along with the focal length via a computer or joystick mechanism. The application of such devices is wide ranging from correctional facilities to schools and shopping centers.

Camera Resolution

Cameras with higher resolutions will produce a better picture. A common measure of resolution is TVL (number of TV lines the camera generates), i.e. a camera with a 300 TVL image is generally not as effective as a camera with a 480 TVL image. Most cameras over 400 TVL will offer an excellent picture. The overall quality of picture is dependent on the type of camera lens, wiring, monitor and recording system.

Infra Red Lighting Cameras

The range that your camera will see in the dark will depend on the sensitivity of the camera, the ambient light and lens combination. Where additional lighting is unsuitable infra red provides the best solution. The human eye cannot see infra-red light, however most monochrome CCTV cameras can. As such the invisible light can be used to illuminate a scene; this allows night time surveillance without the need for additional artificial lighting. Infra-red lamps cannot work with color cameras; therefore the best alternative is to use a dual technology camera (color by day, monochrome at night) together with IR lamps. These cameras are called Day/Night cameras and we install these as standard in the majority of installations.

Quality of Installation

An often over looked area, but system installation can have a huge impact on performance. It is important to understand video transmission in order to select the most appropriate installation method. Using the wrong cables, poor camera positioning, bad connections will affect the overall picture quality. Our fully qualified engineers understand video transmission and posses many years worth of experience to ensure each of customers receive the best installation possible.



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