Pat, 
It is very rare that I disagree with you. You are one great resource for technetters. 
And maybe I am wrong about this. However, I recall the owner's manual on our Hipot tester, for testing an appliance at the AC plug (UL-CSA), said that the unit was to be operated from an outlet equipped with a GFI.

Guy


-----Original Message-----
From: TechNet [mailto:[log in to unmask]] On Behalf Of Pat Goodyear
Sent: Friday, June 07, 2013 11:58 AM
To: [log in to unmask]
Subject: Re: [TN] Hipot Testing

Michael,

I never use a GFCI or GFI with test equipment.    That device is one of 
the most misused pieces of equipment out there, it is designed to 
interrupt power should an internal short occur.    If you are using a 
piece of electrical equipment that has a grounded case, or is double 
insulated the ground is isolated or is housed in plastic the GFI, GFCI 
is not necessary.

If you are using a ungrounded piece of equipment then the GFCI or GFI is 
used to provide a circuit interruption should the neutral go to ground, 
also beneficial if you are using equipment in or around water.

The exception to this is a piece of equipment O'scope or Hi-pot that you 
are referencing to something other then ground.

So it depends on how you are referencing the hi-pot.

Personally I don't use them unless I am using equipment around water.

pat



On Fri, Jun 7, 2013 at 8:16 AM, Michael Strong wrote:

> Wondering if I can pick the brain of somebody out there.  When 
> performing
> Dielectric strength testing most of my failures are the result of a 
> GFI.  I
> can turn this feature off on my instrument and was wondering if most 
> people
> who do this testing do the same.  I know this is a safety feature but 
> I'm
> trying to find a more standardized way of doing this test.  What are 
> the
> likely consequences of turning this feature off?  Any advice would be
> appreciated.
>
>
>
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