Electrical Contracting News (ECN) March 2017 - Page 35

SECURITY SPECIAL FEATURE What should I look for when selecting a camera? • Resolution – this should match the DVR’s record resolution to achieve the required footage quality. • Lens size – the smaller the lens size, the broader the image that can be achieved. • IR – Infrared measures the capability of the camera for night time use and is typically stipulated in metres. If you wish to achieve 10m at night then it is best to select a camera with 20m capability. Also, standard security flood lights will greatly assist for night time viewing. • IP rating – if the camera is to be used externally the IP rating will provide a guide for its suitability. Typically IP66 will be a good option for most external applications. A system can be built by selecting the individual components or purchasing a CCTV kit that contains everything required. Where should I place the cameras? Generally, cameras will cover doorways, windows and anywhere on the property that is vulnerable. There may be different applications, for example, covering a car, an outhouse or monitoring staff or a relative. If there is a specific target to be covered make sure the target takes up a minimum 25 per cent of the view of the camera. What type of cable do I use? Typically, RG59 shot gun cable – this will carry the video and power signal to the camera. Pre-terminated cable is also available for quick plug and play installations. Alternatively Category 5e cable with Baluns can be used. How far can I run a camera from a DVR? Most systems can achieve 300m plus, but this is dependent on the cable type and power location. Can I connect a DVR to a normal TV? Yes, the majority of systems will have outputs such as HDMI which are suitable for most televisions. But it’s important to install the DVR in a secure location, not next to the TV/DVD player, for example, as this will make the system vulnerable. What is remote viewing? Most CCTV systems can now connect to the Internet. The system then can be accessed remotely from anywhere in the world via smartphone, laptop or PC as long as there is data connection. ELECTRIC VEHICLE CHARGING AT HOME The UK’s leading manufacturer of EV charging points ü ü ü Over 50,000 EV charging points manufactured to date The UK’s largest range of EV charging points EV charging points for the home, business and public sector AT WORK IN PUBLIC CHARGE POINT TESTING For more details about Rolec EV charging points, call in at your local electrical wholesaler or visit www.rolecserv.com t: ++44 (0)1205 724754 : rolec@rolecserv.co.uk