Much appreciated David!

Nick

On Sun, Sep 18, 2016 at 12:25 PM, David Forbes <dfor...@dakotacom.net>
wrote:

> Nick,
>
> The mark that indicates that the input and output are fully isolated from
> each other is a square within another square, called "double insulated". If
> you don't see that mark, and you see a UL or ETL mark, then it's reasonable
> to assume that the barrel is grounded, because otherwise the unit wouldn't
> pass UL or ETL testing.
>
>
> On 9/18/16 12:06 PM, Nicholas Stock wrote:
>
>> Hi Fellow lovers of neon...
>>
>> I have a question from a bit of a novice here (me..). I'm working on a
>> project that involves a dekatron or two and want to make sure that
>> there's some degree of safety when placed inside a metal case and HV is
>> involved. Instead of an IEC inlet and transformer inside the device, I
>> want to use a 12V DC supply with a ground connection or -ve side tied to
>> Earth. I found the following picture in my PSU stash and checked the
>> continuity of the barrel side of the supply and Earth and there's
>> continuity. Can anyone tell me which symbol on the PSU denotes this
>> (instead of it being a truly isolated supply) or if anyone has any other
>> ideas about how to go about a 'safe' 12V DC supply (I looked at the
>> medical grade PSU's with 4 pin DIN and earthed shell, but they're quite
>> expensive).
>>
>> Apologies if this seems like a stupid question...
>>
>> Thanks,
>>
>> Nick
>>
>> image1.JPG
>>
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>
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> David Forbes, Tucson AZ
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