The silkscreen indicates it's a 200V supply. The designer obviously used
somewhat more generous routing rules for part of the design, but didn't put a
nice fence around the area like I generally see.
You are correct that OSHA declares high voltage to be 600V and over. (I think
that's instantaneous, which would be around 400VAC, but I'm not sure.)
I would agree that no corona-resistant soldering techniques are called for in
this case, especially in light of no instructions from the customer.
Wayne Thayer
-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of stephen gregory
Sent: Friday, June 05, 2015 9:30 PM
To: [log in to unmask]
Subject: Re: [TN] PCB High Voltage Soldering Requirements?
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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| View on stevezeva.homestead... | Preview by Yahoo | |
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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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