SDAA213 June   2026 ISO1042 , ISO1050 , ISO1410 , ISO6440 , ISO6440-Q1 , ISO6441 , ISO6441-Q1 , ISO6442 , ISO6442-Q1 , ISO7740 , ISO7741 , ISO7741-Q1 , ISO7742 , ISO7742-Q1 , ISO7831 , ISO7842

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Distinguish Different Safety Standards
    1. 2.1 Hierarchical Relationships of Safety Standard Governing Agencies
    2. 2.2 Types of Safety Standards
      1. 2.2.1 System and Equipment Standard
      2. 2.2.2 Component Standards
      3. 2.2.3 Coordination and Support Standards
      4. 2.2.4 The UL 1577 Standard Versus the IEC 60747-17 (VDE 0884-17) Standard
    3. 2.3 Example – Safety Standards in Solar and Energy Storage Systems (ESS)
  6. 3Understanding the Role of the Safety Standards in System Applications
    1. 3.1 Purposes of Safety Requirements
    2. 3.2 Levels of Safety Insulation
      1. 3.2.1 Functional Insulation
      2. 3.2.2 Basic Insulation
      3. 3.2.3 Supplementary Insulation
      4. 3.2.4 Double Insulation
      5. 3.2.5 Reinforced Insulation
    3. 3.3 Example – Safety Requirements of 1500V String Inverter
  7. 4Summary
  8. 5References

3.2.1 Functional Insulation

Functional insulation is the lowest level. The only purpose of functional insulation is to maintain proper function of the circuit, such as adding insulation between conductive parts within a circuit for a high voltage and low voltage connection, or common-mode transient immunity (CMTI). Functional insulation does not provide protection against electrical shock.