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February 2019

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Subject:
Re: IPC2221 Electrical Conductor Spacing Requirements
From:
Jack Olson <[log in to unmask]>
Reply To:
TechNet E-Mail Forum <[log in to unmask]>, Jack Olson <[log in to unmask]>
Date:
Mon, 4 Feb 2019 09:40:45 -0600
Content-Type:
text/plain
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text/plain (12 lines) 
On Mon, 28 Jan 2019 10:54:30 -0600, Steven Schell <[log in to unmask]> wrote:

>I am trying to interpret the electrical clearance requirements in the IPC2221A standard, under section 6.3.
>Table 6-1 lists minimum spacing requirements for various voltage ranges between conductors.
>The table indicates that this is for AC or DC peaks.
>I am trying to interpret that last part.
>Our application has a tracking power supply that provides a variable DC output voltage.  The average DC voltage is between 16 and 30V, but the peak instantaneous DC voltage exceeds 31V.  
>In this case, should I be complying with the minimum spacing requirements for 16-30V, or should I be complying with the minimum spacing requirements for 31-50V.

Your clearance needs to be designed for the maximum.
I think you need to use the 31-50V value.

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