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Electrical Switchboards
Electrical Switchboards
An electric switchboard is a device that distributes electricity from one or more sources of supply to several smaller load circuits. It is an assembly of one or more panels, each of which contains switching devices for the protection and control of circuits fed from the switchboard. Several manufacturers make switchboards used in industry, commercial buildings, telecommunication facilities, oil and gas plants, data centers, health care, and other buildings, and onboard large ships.
A switchboard is divided into different interconnected sections, generally consisting of a main section and a distribution section.
Low Voltage Switchboards
Low-voltage metal-enclosed switchgear is a three-phase power distribution product designed to safely, efficiently and reliably supply electric power at voltages up to 1,000 volts and current up to 6,000 amps. Typical switchgear is rated for up to 635 volts with a continuous current main bus rating of up to 10,000 amps (for supplying power from parallel sources).
The main functions of lv switchgear are to provide-
Electrical Protection
Electrical Isolation of installations, circuits and equipment
Local or remote switching
Switchgear systems connected to the electric supply system, de-energise equipment for maintenance, and defect testing. Without switchgear in place, whenever there is a short circuit or failure on the power system, a heavy current runs through the electric equipment, damaging the equipment and disrupting the end user.
Switchgear is used in electric utility transmission and distribution systems at commercial or industrial facilities of varying size. The safety standards for electrical switchgear are defined by IEC in Europe.
High Voltage Switchboards
High voltage switchgear is any switchgear used to connect or disconnect a part of a high-voltage power system. This equipment is essential for the protection and safe operation, without interruption, of a high voltage power system, and is important because it is directly linked to the quality of the electricity supply.
The term "high voltage" covers the former medium voltage (MV) and the former high voltage (HV), and therefore refers to equipment with a rated voltage of over 1,000 V in the case of alternating current, and over 1,500 V in the case of direct current. The industrial applications of high voltage circuit breakers are for the moment limited to alternating current because they are more economical, there are however high voltage disconnectors for direct current connections.
Power Control Centers (PCC)
Power Control Center (PCC) is a main power control panel which consists of feeder breakers and supply breakers, monitoring devices, control devices etc. The Power Control Center has compartmentalized panel with a current carrying capacity ranging from 400 A to 6300 A.
Motor Control Centers (MCC)
A motor control center (MCC) is a type of electrical switchboard, which contains one or more motor starter sections. The advantage of utilizing a CUBIC switchboard solution for motor starter sections is that the solution can be combined with other distribution switchboards.
VFD Panels
Variable frequency drive control panel (also named VFD panel, AC drive electrical control panel) is consisted of inner VFD inside the cabinet with external control, protect, display and other electrical, it's an frequency conversion device to control three phase AC motor (including fans and pumps) in variable speed to save energy.
Typical applications: water supply, air compressors, central air conditioning, port machinery, machine tools, boilers, paper machinery, food machinery and so on.
Distribution Boards
A distribution board (also known as panelboard, breaker panel, electric panel, DB board or DB box) is a component of an electricity supply system that divides an electrical power feed into subsidiary circuits while providing a protective fuse or circuit breaker for each circuit in a common enclosure. Normally, a main switch, and in recent boards, one or more residual-current devices (RCDs) or residual current breakers with over current protection (RCBOs) are also incorporated.
Ring Main Units
In an electrical power distribution system, a ring main unit (RMU) is a factory assembled, metal enclosed set of switchgear used at the load connection points of a ring-type distribution network. It includes in one unit two switches that can connect the load to either or both main conductors, and a fusible switch or circuit breaker and switch that feed a distribution transformer. The metal enclosed unit connects to the transformer either through a bus throat of standardized dimensions, or else through cables and is usually installed outdoors. Ring main cables enter and leave the cabinet. This type of switchgear is used for medium-voltage power distribution, from 7200 volts to about 36000 volts.
Ring main units can be characterized by their type of insulation: air, oil or gas. The switch used to isolate the transformer can be a fusible switch, or may be a circuit breaker using vacuum or gas-insulated interrupters. The unit may also include protective relays to operate the circuit breaker on a fault.
Genset Syncronising Panel
Synchronization panels are mainly designed and used to meet power system requirements. These panels function both manually and with an automatic synchronizing function for two or more generators or breakers. They are widely used in synchronizing generators and offering multiplex solutions.
Junction Box
An electrical junction box (also known as a "jbox") is an enclosure housing electrical connections. Junction boxes protect the electrical connections from the weather, as well as protecting people from accidental electric shocks.
A small metal or plastic junction box may form part of an electrical conduit or thermoplastic-sheathed cable (TPS) wiring system in a building. If designed for surface mounting, it is used mostly in ceilings, under floors or concealed behind an access panel—particularly in domestic or commercial buildings. An appropriate type (such as that shown in the gallery) may be buried in the plaster of a wall (although full concealment is no longer allowed by modern codes and standards) or cast into concrete—with only the cover visible.
It sometimes includes built-in terminals for the joining of wires.