Types and characteristics of circuits in very low voltage networks

The circuits in very low voltage networks (SNN) are used by appliances with low connection capacity of less than 0.25 MW. These include three types of cycles: SELV, Felv, Pelv. These systems differ in structure and functions. Their use is common - they are found, including in electronic devices of everyday use. Below you will find the necessary information about the SELV, FELV and Pelv chains. What are the circuits in very low voltage networks?
The voltage U 50 V AC or U 120 V DC is used to power circuits in very low voltage networks. These are numbers accepted in applicable standards as maximum long -term permissible voltage values. Each of the systems has a different structure: SELV chains are separated from other systems and feed from a protective transformer or electrochemical source. They do not have grounded parts or open conductive parts;
PELV chains differ from SELV chains only in that they have grounded parts and/or open conductive parts;
Felv chains are not completely separated from other systems. The source of their power can be any galvanic device separated from the supply network. Due to the fact that the cables and wires are not insulated from higher voltage systems in SELV circuits, they should use the selected protective equipment against direct and indirect touch, respectively. In addition to using the casings, it is also necessary to use protection with the automatic shutdown of the power source in case of a malfunction. The use of low -voltage systems
Low voltage systems differ in the type of use. SELV and PELV circuits perform a protective function, i.e., preventing electric shock. These two types of circuits in small electronics are most common. On the other hand, the FELV circuit is mainly used to reduce the operating voltage, so it is used for functional purposes. Each electrician should be familiar with low -voltage networks and be able to correctly perform the described types of installation in the places where it is required. сними проститутку или индивидуалки Зеленограда интим со шлюхами

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