Thank you to all who provided a response to my question.  Your input and 
comments are, as always, greatly appreciated.

Happy Holidays to all I look forward to seeing you at ISPCE in Dallas in May.

Best regards,



>     On 12/01/2022 3:51 PM Steve Brody <sgbr...@comcast.net> wrote:
> 
> 
>     I have a client who has a secondary pwb that has traces and vias that may 
> have 100 vdc on them adjacent to ground. 
> 
>     Per 61010-1 there is a requirement for spacing and/or dielectric test, 
> both depending on what the mains voltage is. 
> 
>     The question is why is the mains voltage a consideration or concern if 
> the 100vdc secondary voltage is several layers of impedance and circuitry 
> from the mains? 
> 
>     Is it a concern that a surge on the mains would trickle down to the 
> secondary circuit, or is there another reason/rationale? 
> 
>     I suggested that a dielectric test per Table 6 [in A1] would suffice and 
> put the issue to rest for this product, but the question from the designers 
> remains as to why is it a concern in the standard of what the mains voltage 
> is.
> 
>     Is there anything in the standard, that I haven't found, that does not 
> require Table 6 to be followed if there is no way for a mains surge to impact 
> the secondary voltage? 
> 
>     I look to the experts for an explanation. 
> 
>     Thanks,
> 
>     Steve Brody
>     sgbr...@comcast.net mailto:sgbr...@comcast.net
>     C - 603 617 9116
>     -
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Steve Brody
sgbr...@comcast.net mailto:sgbr...@comcast.net
C - 603 617 9116

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