[GreenKeys] Need wiring sheet of a WU M15TTY Base

[Jeffrey D Angus]

On 8/3/2013 1:21 PM, Norm wrote:
> Has anybody ever had this experience with a ground fault outlet? 
Ground Fault Interrupters are triggered by a difference of current
between the hot and the neutral side of the line. Obviously they
should BOTH be the same.

Some equipment, especially older, put a bypass capacitor from
both sides of the power line to ground.

Such being the case, since neutral is close to the same potential
as the ground itself, there will be considerably less current through
the capacitor on the neutral side than on the hot side. That's your
imbalance and that's what is tripping the GFI.

<http://en.wikipedia.org/wiki/Residual-current_device>

For a trip current of 5 mA, that only requires 24K ohms. At 60 Hz,
this is the same as roughly 0.1 uF.

For this reason, the newer line bypass capacitors are typically no
more than 0.015 uF. (roughly 750 uA. Which by the way is still
enough to get your ateention is you come across it.)

Additionally, the capacitors need to be X and Y rated for safe use
across mains power or from Mains power to ground.

<http://www.newark.com/pdfs/techarticles/johansondielectrics/JDI_Training-Safety_2008-01.pdf>

Jeff-1.0
wa6fwi


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