Re: 110V ac

From: John Larkin (jjSNIPlarkin_at_highTHISlandPLEASEtechnology.XXX)
Date: 02/12/05 

Date: Sat, 12 Feb 2005 11:10:39 -0800

On Fri, 11 Feb 2005 21:45:42 +0000, John Woodgate
<jmw@jmwa.demon.contraspam.yuk> wrote:

>I read in sci.electronics.design that John Larkin <jjlarkin@highSNIPland
>THIStechPLEASEnology.com> wrote (in <gt6q0194pak21vuu69529hkk6pbd0de5sd@
>4ax.com>) about '110V ac', on Fri, 11 Feb 2005:
>
>>Do fusebox GFD's false-trip a lot? We have them in outlets in the
>>kitchen, bathrooms, and garage, anywhere potentially wet, and certain
>>brush-motor-type appliances tend to trip them; slows me down grinding
>>coffee sometimes. Sometimes they just trip, probably from transients
>>somewhere.
>>
>>I measured 5 megs leakage on my garbage disposal, and that was enough to
>>trip a GFD. I also had a sump pump (the lower level of my house is below
>>the street, so we have to pump stuff up from the lower bathroom) that
>>tripped its GFD from a tiny bit of leakage.
>
>It sounds as though you have voltage-sensing devices. In Europe we now
>have differential current-sensing devices - Residual Current Circuit
>Breakers - with controlled operating currents, such as 10 mA and 30 mA.
>The latter are normally used, ad protect very well against life-
>endangering shock while minimising nuisance tripping.

How could a GFD be a voltage sensing device? What voltage would it
sense? Every one I ever heard of was a common-mode current
transformer.

John

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