Thanks, Guy by all means use the manufacturers recommendations and or 
your company's safety manual.     I don't trust GFCI's when using test 
equipment however seen too many bum readings.

As I understand it there are two GFCI/GFI classes Class A operates at 
5mA and Class B operates at 20mA which is customarily for equipment 
protection.

pat
>
> 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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