Electrical problem at Tank Probes
I was working under my 5th wheel today and my sewage tank was exposed. There is one probe by itself with a white wire and on the other side there are three probes with different coloured wires. When m...
Forum Discussion
Open ground on the shore cord or outlet.. The "Probe by itself" is a chassis ground. or basically a chassis ground. It has no connection to the 120 volt systems but.. If the shore ground is open there may be 60 volts on this wire relative to earth ground This is NORMAL under the conditions, but the conditions (open shore ground) are NOT normal. The Shore ground has two jobs.. ONE of them is to take that 60 volts and short it out (make is zero).
Page 2 That 60 volts (RMS) comes from a voltage divider made up of two capacitors.. The capacitor is two metal pieces with insulation between them
The neutral wire and the safety ground in a piece of ROMEX = Capacitor
The HOT wire and the safety ground = The other capacitor.
Since all 3 wirs are the same length that makes a 1/2 voltage divider.
Current limit is kind of tiny though.
but the problem is an open ground between RV and Shore.. Where it is I can not tell without testing.
The good news: Current kills. and as I said, this low-value voltage divider can not provide much of that.
Page 2 That 60 volts (RMS) comes from a voltage divider made up of two capacitors.. The capacitor is two metal pieces with insulation between them
The neutral wire and the safety ground in a piece of ROMEX = Capacitor
The HOT wire and the safety ground = The other capacitor.
Since all 3 wirs are the same length that makes a 1/2 voltage divider.
Current limit is kind of tiny though.
but the problem is an open ground between RV and Shore.. Where it is I can not tell without testing.
The good news: Current kills. and as I said, this low-value voltage divider can not provide much of that.
