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Interpretation of IEC/UL/CSA 62368-1 Electrical Distance Requirements

Edit: ANCI 2021-12-30 47

Article overview: 62368-1 has been implemented in most countries and regions. As a common standard for IT and communication equipment and computer peripheral products, the products meet the requirements of the 62368-1 standard and become an important step to enter the international market. It plays a very important role in the evaluation of regulations.

62368-1 has been implemented in most countries and regions. As a common standard for IT, communication equipment and computer peripheral products, the products meet the requirements of the 62368-1 standard and become an important step to enter the international market. Among them, electrical distance plays a very critical role in safety assessment. The risk of electric shock is the focus of safety assessment, and electrical distance is an important method to meet the protection of electric shock. ANCI Xiaobian compiled and collected relevant information, and made a simple induction and interpretation of the electrical distance requirements in 62368-1.

Electrical distances are divided into two categories, namely clearance and creepage.
CLEARANCE REQUIREMENTS OF 62368-1
CLEARANCE REQUIREMENTS, the corresponding clause of 62368-1 is 5.4.2, and is the primary method for evaluating clearances. In addition, Appendix X provides a second alternative method, and the original method is 1 of 2.

a) Clause 5.4.2 of 62368-1 requires two paths to evaluate clearances, namely the working voltage look-up table method (clause 5.4.2.2) and the withstand voltage look-up table method (clause 5.4.2.3), and then take the highest value. There are many contents in this clause, which are summarized in the following table for easy understanding and use. 

 

62368-1 Creepage distance requirements

Compared to the clearance requirements of 62368-1, the requirements for creepage distances in Clause 5.4.3 of 62368-1 are simpler. Summarized as follows:

  • For basic and supplementary insulation, look up Table 17 (corresponding to Table 18 of the second edition).
  • When applying Table 17 and Table 18, the value of reinforced insulation is equal to twice the value of basic insulation.
  • If the circuit frequency is 30kHz<F ≤400kHz, the minimum creepage distance is shown in table 18 (corresponding to the second edition of table19). If the value is less than Table 17, the Table 17 value applies.
  • When the creepage distance is less than the clearance, the creepage distance shall be equal to the value of the clearance


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