SLUAAR5 august   2023 ISO5451 , ISO5452 , ISO5851 , ISO5852S , ISO7741 , ISO7810 , ISO7820 , ISO7821 , ISO7830 , ISO7831 , ISO7840 , ISO7841 , ISO7842 , UCC23513 , UCC5310 , UCC5320 , UCC5350 , UCC5390

 

  1.   1
  2.   Abstract
  3. 1Introduction of Key Terms in IEC60664
    1. 1.1 Clearance and Creepage
    2. 1.2 Insulation Type
    3. 1.3 Decisive Voltage Class and Extra-Low Voltage
    4. 1.4 Protection Class
    5. 1.5 Pollution Degree
    6. 1.6 Overvoltage Category
    7. 1.7 System Voltage
    8. 1.8 Working Voltage and Voltage Block
  4. 2Insulation Distance Definition
    1. 2.1 Clearance and Creepage Determining Process
    2. 2.2 Clearance and Creepage Determining Method Example
  5. 3Summary
  6. 4Reference

1.3 Decisive Voltage Class and Extra-Low Voltage

DVC: Decisive voltage class is the classification of voltage range used to determine the protective measures against electric shock. The limit of DVC can be referred to table 3 of the international standard IEC61800-5-1 (adjustable speed electrical power drive systems, part 5-1: safety requirements for electrical, thermal and energy)

ELV: Extra low voltage defines any voltage not exceed 50V ac-rms and 120V dc. Protection against electric shock is dependent of the DVC. DVC A and B are contained in the voltage range of ELV.