A TT system, has the neutral of the source of energy connected as for TN-S, but no facility is provided by the distributor for the consumer’s earthing. With TT, the consumer must provide their own connection to earth, i.e. by installing a suitable earth electrode local to the installation.
A TN-C-S system, has the supply neutral conductor of a distribution main connected with earth at source and at intervals along its run.This is usually referred to as protective multiple earthing (PME). With this arrangement the distributor’s neutral conductor is also used to return earth fault currents arising in the consumer’sinstallation safely to the source. …
A TN-S system has the neutral of the source of energy connected with earth at one point only, at or as near as is reasonably practicable to the source and the consumer’s earthing terminal is typically connected to the metallic sheath or armour of the distributor’s service cable into the premises or to a separate …
Commercial and industrial distribution systems use various methods to conduct electrical energy. These methods often include heavy conductors run in trays or conduit. Cable and conduit assemblies are costly and time consuming to install. Once installed, they are difficult to change. To eliminate these shortcomings, power is often distributed using enclosed bus bars. This is …
A power distribution system is a group of components that carries electrical power throughout a building. Distribution systems are used in every residential, commercial, and industrial building. Distribution systems used in commercial and industrial locations are complex. They include metering devices to measure power consumption, main and branch disconnects, protective devices, switching devices to start …
A network camera, also known as Internet camera, IP camera or Internet video camera types , transmits live digital video over an Ethernet network to back-end devices such as a PC or 3G phone. With a dedicated IP address, a built-in web server and audio/video streaming protocols, it can work independently for real-time monitoring Introduction. …
Access control system as overview allow the free movement of authorized personnel while restricting unauthorized intrusion. A device that stops you from getting from A to B unless you are authorized to do so. The device or devices could be: Mechanical, Electric or Motorized Locks. Turnstiles and Tubestiles. Mechanical and Electric Gates, Barriers. Mechanical and …
What is BACnet meaning is a communication standard that allows for data exchange (including complex data) between systems from various vendors BACnet allows for interoperability of devices and systems from various vendors in BMS BACnet is independent from any specific hardware, operating system or software platform BACnet Networking Options Ethernet BACnet over IP Serial (RS232/RS485) …
Lens Form Factors for Image Sensor Sensor sizes are specified by the diagonal and mainly include 1/4″, 1/3”, and 1/2″. A lens can fit in with a smaller sensor. When using with a larger-sized sensor, for example, a 1/4” lens with a 1/3” sensor, the situation of darkcorners in the image will be caused. View …
An cctv image sensor plays a key role in converting lights through the lens into electrical signals. Based on the cctv cameras manufacturing process, there are two types of sensors: CMOS (Complementary Metal Oxide Semiconductor) andCCD (Charge-coupled Device). CCTV Image Sensor Types : CMOSCMOS is a standardized and constantly developing manufacturing process used in the …