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Never draw a power PCB like this

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EEEnthusiast:
If you have any ground pours near those contacts, I would recommend to move them apart and have no ground fills near the L & N entry points. The same goes for wherever these high voltage lines are routed.

bjbb:
No problem. Compliance engineers/techs do this (on purpose) several times per week or day.

In fact, all EEs should probably spend a day watching a series of fault tests per on of the major safety standards early in your career, at least once. [Can be done in Asia or Europe labs, but NRTL and SCC labs in North America will not allow 'spectators'].

v8dave:

--- Quote from: EEEnthusiast on November 08, 2019, 02:14:36 am ---If you have any ground pours near those contacts, I would recommend to move them apart and have no ground fills near the L & N entry points. The same goes for wherever these high voltage lines are routed.

--- End quote ---

It does look like there is a ground pour and that is likely where the short occurred. The spacing looks OK to me too but that ground pour is a big no no around high voltage areas.

Make a cutout in the ground pour next time and also use slots in the PCB to increase the creepage distance if you really must have high voltage AC on your PCB.

China NewBoy:

--- Quote from: nife on November 08, 2019, 12:22:46 am --- It is likely the (legally required) strain relief which is the real culprit.

--- End quote ---
that's right

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