What Is the Voltage Classification


Nominal Voltage Classification in Transmission and Distribution System


To identify the voltage level effortlessly in a transmission and distribution system a significant voltage classification is essential. The voltage class is uses not only to identify the level of system voltage, but the main important is to classify the Apparatus voltage ranges for operation and maintenance an electrical energy transmission and distribution system.
Voltage Class

According to the apparatus voltage range the nominal voltage class in a system may be as below:

1.     EHV or Extra High Voltage: 

The voltage level above 132 kV or 132,000 Voltage is known as Extra High Voltage or in short EHV class. The equipment, conductors and accessories which should be used must comply with EHV Class is known as EHV or Extra High Voltage Apparatus.

2.     HV or High Voltage

The voltage level between above 33 kV (33,000 Voltage) and below or equal to 132 kV (132,000 Voltage) is known as High Voltage or in short HV class is (33kV < HV ≤ 132kV). The equipment, conductors and accessories which should be used must comply with HV Class is known as HV or High Voltage Apparatus.

3.     MV or Medium Voltage:  

The voltage level between above or equal to 1 kV (1,000 Voltage) and below or equal to 33 kV (33,000 Voltage) is known as Medium Voltage or in short MV class is (1kV ≤ MV ≤ 33kV). The equipment, conductors and accessories which should be used must comply with MV Class is known as MV or Medium Voltage Apparatus.

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4.     LV or Low Voltage: 

The voltage level between above or equal to 25V (25 Voltage) and below 1 kV (1,000 Voltage) is known as Low Voltage or in short LV class is 1kV (25V ≤ LV < 1kV). The equipment, conductors and accessories which should be used must comply with LV Class is known as LV or Low Voltage Apparatus.

5.     ELV or Extra Low Voltage: 

The voltage level below 25V or 25 Voltage is known as Extra Low Voltage or in short ELV class is (ELV < 25V). The equipment, conductors and accessories which should be used must comply with ELV Class is known as ELV or Extra Low Voltage Apparatus.

Don’t forget, this the general notion for nominal voltage class, it’s may vary for different standard or a region where it uses to. To keep in touch important engineering and technological more article, hit the like or share button for you and your networks.

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