GFI

Status
Not open for further replies.

sparkyoh

Member
Location
Ohio
Re: GFI

they dont use a voltage divider. they use a current coil and run just the neutral and hot through it if the send current on the hot is equal to the return on the neutral then there is no current developed in the coil but if there is a diffreance then it will actavate the tripping electronics and open
Yes, Hurk, thats correct but the above post was referring to the test mechanism, was he not ?
The quote refers to a 15k resistor and there is two of them
When you first open one of them up, by removing the 4 screws the first thing you see is a solenoid
which opens the contacts, on a ground-fault or by pushing the test button. The solenoid is energised by a switching transistor which is fired by an OP-Amp, when the op-amp gets its input from the torroidal coil which senses/monitors the unbalance between the hot/Neutral.{According to the man.there can be aleakage as high as 2.5 ma}.
They fail in the close position because the solenoid is toast.
the one I got here is a Hubble the strange part of the sensing coil is there is a white wire and a bare wire passing through the torroid.

sparkyoh
 
Status
Not open for further replies.
Top