Countdown to compliance

Days
:
Hours
:
Minutes
:
Seconds
Dashboard Log out

I calculated the clearances according to 5.4.2.1 and got the highest value according to Procedure 1. Now I want to find the test voltage from Table 16. Can I use 5.4.2.3.2.5 for decreasing the required withstand voltage to get lower test voltage?

I calculated the clearances according to 5.4.2.1 and got the highest value according to Procedure 1. Now I want to find the test voltage from Table 16. Can I use 5.4.2.3.2.5 for decreasing the required withstand voltage to get lower test voltage? The product is SMPS.

All references are to the published IEC 62368-1: 2014, unless otherwise indicated.

You indicated that you calculated the clearances according to 5.4.2.1 and got the highest value according to Procedure 1.  Then you indicate you want to find the test voltage from Table 16. 

Please note, per 5.4.2.1, to determine the Clearance, the highest value of the two procedures is used, Procedures 1 & 2.

Table 16 is associated with 5.4.2.4 “Determining the adequacy of a clearance using an electric strength test.”  5.4.2.4 is part of Procedure 2 (the alternative approach if Procedure 2 is larger than Procedure 1).

However, since you indicated you already got the highest value according to Procedure 1, there is no need to use Procedure 2 & 5.4.2.4 (Clearance per Procedure 1 + ES).  You use Procedure 1 without Electric Strength.

Please look at the flowchart in 5.4.2 of IEC TR 62368-2, Explanatory information related to IEC 62368-1.  It illustrates nicely the relationship between Procedures 1 & 2.

Note, you also reference 5.4.2.3.2.5, “Determining transient voltage levels by measurement,”  but this sub-clause only is used if you do not want to use the assumed transient voltages per Table 13.  It is not used for withstand voltage.

Back to "You ask, we answer"