One of the important principles in maintaining the durability and efficiency of motors and electrical devices in factories and residential houses is the use of electrical panels to control the input voltage to these devices. Before you decide to buy a low pressure switchboard, you should first consider the number of devices and the voltage passing through the switchboard. The uses of low voltage switchboards are very diverse, but not unlimited. Switchboards are divided into three categories, low pressure, medium pressure and high pressure, according to the amount of voltage passing through them. As their name suggests, the stronger the voltage, the more powerful the switchboard must be installed to control it efficiently. For example, the typical input current (according to the international standard) for the low voltage switchboard is from 35 to It is 1000 volts, which if more voltage is passed, it may damage the electrical panel or even explode it. Definitely, at such a voltage, a low pressure switchboard will not give you any assurance in protecting your electrical devices. This is why you must collect complete information before installing the electrical panel.
What is a low -pressure electrical panel?
The low pressure switchboard is the most common switchboard for use at home or in small factories, which does not require much open space, and its installation and setup costs are also very affordable. The advantages of using a low pressure switchboard include increasing life, reducing additional costs, and maintaining the quality of electrical devices, but it is not limited to these.
Low -voltage power panel components
The components of the low voltage switchboard are composed of three separate and separated parts:
- Disconnection section
- Bus compartment
- Cable compartment
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To get to know the low pressure switchboard, we need to get to know the most important member of a switchboard, i.e. the circuit breaker. Each breaker section can typically hold up to four power circuit breakers arranged vertically. Each breaker isolates the power circuit separately from other breakers. Behind the circuit breaker compartment is the bus compartment, which is protected by solid barriers. Finally, the cable compartment is located at the back of the switchboard and is optionally separated from the bus compartment by openable barriers.
The cable compartment has hinged doors or removable covers that allow access to panel wires for installation or makes it possible to cut them off. This enclosure arrangement is the most common type and may also be called a 'rear access low pressure switchboard' as access to the rear of the switchboard enclosure is required.
Poor Power Panel Types
A different type of low pressure switchboard is front accessible switchboards where the cable compartment is adjacent to the breaker compartment and the cable compartment doors are located at the front of the equipment. This arrangement results in a much shallower design that does not require rear access and allows the switchboard to be placed next to the wall.
Wide distribution of the low voltage switchboard to increase the safety, reliability and serviceability of the switchboard and It is designed to prevent accidental contact with low voltage switchboard components such as circuit breakers in adjacent cells during maintenance. Partitioning can also limit some of the damage caused by an arc fault and reduce the risk of the fault spreading to other parts of the panel. Among the most common types of low voltage switchboards are the following: 1- Main switchboards
2- SUB switchboards
3- DB switchboards or common wall switchboards in almost small sizes
4- MARSHALING intermediate electrical panels
5- PLC or DCS panels
5- Capacitive electrical panels
6- Sliding electrical panels
7_ MCC switchboards
How to operate low -voltage power panels and uses
In all types of low voltage switchboards, the electric current flows through the low voltage switchboard housing through silver or tin plated copper bus. Some of these breakers connect the breaker daggers that are mounted horizontally into the breaker cells in one part of the panel and are connected to the two sides of the feeder line breakers through finger clusters. The horizontal busbar (main) electrically connects adjacent panel sections to each other.
Runbacks
"Runbacks" from the load side of each feeder breaker horizontally It returns and runs through the bus housing (without connecting to the main slope) into the cable housing to provide edge landings for connecting to the ends of the load cables. In most types of low pressure switchboards, insulation or dielectric resistance between the three bus phases is provided through an adequate air gap. In places where the bus clearance is not sufficient to provide the required dielectric strength, insulation is applied to the bus (which is not very common). >
The low voltage switchboard provides short circuit and overload protection through low voltage circuit breakers (LV-PCB) with integral trip units. These low voltage switchboard circuit breakers are usually pull-through devices. "Through the door" means that the front panel of the circuit breaker along with the controls mounted on the breaker is accessible without opening the switch.
Draw-out
“Draw-out” means that the circuit breaker can be easily placed in the test and trip position without opening the switch and can be completely withdrawn from the switch for service. Low-voltage circuit breakers interrupt short-circuit and overload faults through exposed main contacts. As a result, such circuit breakers are more economical and simpler compared to medium voltage circuit breakers that usually use God circuit breaker technology. They are also known as Air Circuit Breakers (ACB).
Input Source Low Pressure Board Panel
Input source transfers the input electrical power to the input bus. gives The low pressure switchboard used at the entrance must have a main switching device. The switching devices connected to the input must be able to withstand the abnormal current for a short period of time to allow the downstream devices to operate. This section must have a contiguous arrangement with downstream devices. In general, air circuit breakers are preferably used as a disconnecting device. Electrical devices are protected against short circuit and overload by electrical fuses or circuit breakers. However, the human operator is not adequately protected against errors that may occur inside the devices. This problem can be overcome by using the earth leakage circuit breaker. The earth leakage circuit breaker can detect leakage currents up to 100mA and is able to disconnect the device in less than 100ms. It is the quick operation of the components of the low pressure electrical panel that keeps your electrical appliances safe from electrical damage.