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November 1997

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Subject:
Re: 110v air gap
From:
Ralph Hersey <[log in to unmask]>
Reply To:
[log in to unmask]
Date:
Tue, 25 Nov 1997 10:31:45 -0800
Content-Type:
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[log in to unmask] wrote:
>
> can you please tell me how to figure the minimum allowable air gap on a PCB
> for any given voltage?
>
> thanks
>
> Howard Kaminsky
>
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Hi Howard ---

Rodney's response was right-on.  At 110 V if it's ac, like primary
electrical power you may have other electrical spacing regulatory
requiirements, such as UL, CSA, IEC, etc.

The basic 400 V/mm (dc or ac peak)[10 V/millinch] is a good rating for
all "solid/liquid" dielectrics for long term reliability (20-30 years).
In particular, be extremely careful when designing with high voltages
above about 500 Vdc, especially above 1 kV with any type of gas (air)
around the high voltage conductors, corona will catastropically lead to
failure.  Also, solder resist and conformal coating are not suitable for
use as high voltage application primary dielectric materials.

Ralph

Ralph Hersey & Associates
3885 Mills Way
Livermore, CA 94550-3319
PHN/FAX 510.454.9805
[log in to unmask]

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