Safety checking results

Today I got first results from the accredited testing service for compliance of power drive safety standard EN 61800-5-1. They did good job and found few issues:

  1. Isolating transformer between user touchable and hazardous voltage side doesn’t meet reinforced isolation requirements
  2. Clearance from power stage & bridge rectifier mounting screws to PCB tracks not large enough
  3. On one side of the enclosure the vent holes are too large to meet IP30
Isolating transformer (blue) has 3 kV isolation spec

Logic power isolating transformer (blue) has 3 kV isolation spec but still doesn’t meet the strictest interpretation of  the safety standard

Luckily none of them is hard to fix but finding them early was very important!


By contacting transformer manufacturer we learned that the blue winding consists triple insulated teflon wire which fulfills the reinforced isolation standards. If we can confirm that, we save few days of isolated PSU circuit redesign & testing!

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