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June 2015

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Subject:
From:
stephen gregory <[log in to unmask]>
Reply To:
stephen gregory <[log in to unmask]>
Date:
Sat, 6 Jun 2015 01:29:41 +0000
Content-Type:
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text/plain (95 lines)
Let me try this again with the full images and not the thumbnail images:
http://stevezeva.homestead.com/PCB_Power_Supply_Top.jpg

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http://stevezeva.homestead.com/PCB_Power_Supply_Bottom.jpg

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Steve
      From: Steve Gregory <[log in to unmask]>
 To: [log in to unmask] 
 Sent: Friday, June 5, 2015 9:55 AM
 Subject: [TN] PCB High Voltage Soldering Requirements?
   
Hi All,

I have a question regarding high voltage soldering requirements. Quoting
IPC-A-610F page 1-5:

1.6.5 High Voltage - The term "high voltage" will vary by design and
application. The high voltage criteria in this document are only applicable
when specifically required in the drawings/procurement documentation.

So this situation is this; we built an assembly for a customer that was on
a expedited turn, there were no drawings that specified anything about high
voltage assembly requirements. All we had was a BOM and gerbers, and we
were able to get a IPC-D-356 CAD file for our programing software. The
assembly has a EMCO high voltage DC-DC converter installed on it:

http://www.emcohighvoltage.com/datasheets/hseries.pdf

The part number is H03PR, so maximum output voltage would be 300V. This is
the top of the board where it is installed:

http://stevezeva.homestead.com/PCB_Power_Supply_Top_thumb.jpg

This is the bottom of the board where it is installed:

http://stevezeva.homestead.com/PCB_Power_Supply_Bottom_thumb.jpg

I was asked by production if they had to apply high voltage soldering
requirements to the power supply, meaning to cut the leads of the power
supply and form bulbous solder joints, and I said no. For one thing there
was no customer requirement in any of the documents for us to do this, and
I reasoned that the even though the power supply has a "Danger, High
Voltage" label on it it was limited to 300 volts, and for some reason I
seem to have it in my head that a PCB wasn't considered high voltage until
it was carrying 600 volts or more.

Well, I was kind of chastised by quality for telling the operators that
they didn't have to apply high voltage soldering standards to the power
supply. Was I mistaken?

Steve

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