10MΩ? That sounds really high. Multiple google sources tell me GFIs trip
at ~5mA which would be about 22KΩ. 10MΩ would draw something like 11µA.
I'd guess the solenoid valve (which sinks to ground by (bad) design)
probably draws more than that.
Bruce
On 8/28/16 9:19 AM, Ira wrote:
Re: Dead short? Hello Ben,
Sunday, August 28, 2016, 9:00:23 AM, you wrote:
Still scratching my head over the resistance, but...walks like a
duck, quacks like a duck...
A GFI will trip with a 10 meg ohm resistance and many meters see that
as an open as in the world of auto mechanics, home owners and
electricians, the need to see that high a resistance is essentially
never needed and making it happen costs money they don't want to
spend. My Fluke can see stuff like that, but it cost close to $400.
The reason I had him try measuring the case to ground with the
machine plugged into a 2 prong outlet was to simulate something that
would measure high resistance. The fact he saw voltage when we did
that would tend to indicate it was always the element. FWIW, shorting
the RTD leads to ground should not be able to cause any sort of
problem other than bad readings, it certainly will not cause a GFI to
trigger unless the Gicar box is fried in some very unusual and
theoretically impossible to occur fashion.
99% or more of the time, GFIs trigger because of a bad element or
water dripping on an electrical connection where that water can bridge
the wire to ground, most
commonly heating element terminals.
And in case you don't know, heating elements come out easily with an
impact wrench. A friendly mechanic will probably do it for a 6 pack if
you take the boiler out.
-- Ira --
You received this message because you are subscribed to the Google
Groups "Brewtus" group.
To unsubscribe from this group and stop receiving emails from it, send
an email to [email protected]
<mailto:[email protected]>.
To post to this group, send email to [email protected]
<mailto:[email protected]>.
Visit this group at https://groups.google.com/group/brewtus.
For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the Google Groups
"Brewtus" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
To post to this group, send email to [email protected].
Visit this group at https://groups.google.com/group/brewtus.
For more options, visit https://groups.google.com/d/optout.
