karl riley
Senior Member
My last EMF job involved a house with an unusually high magnetic field in the bedroom which backed up to a distribution line. Due to high currents in the water pipes my report recommended that the utility be asked to check the service drop neutral connections. They read the report and to their credit took action.
They came out, made some changes, and the magnetic field in the house dropped to almost nothing. OK. Here is my question:
According to an electrician the utility man talked to, it sounds as if they had been feeding this service drop with two of the transformers along the line. Their idea was that if one Tfmr had a problem the other would keep feeding. I have never heard of this. Maybe Charlie knows about this strategy.
The result was that currents in the line behind the client's house were unbalanced and the resulting net current created the fields in their house. Leaving aside the phases, the service drop neutral had two ways to go once it reached the secondary line.
The utility's fix was to feed from just one Tfmr (what a fantastic idea!) and the net current and its field were gone.
Any comments about this double feed?
Karl
They came out, made some changes, and the magnetic field in the house dropped to almost nothing. OK. Here is my question:
According to an electrician the utility man talked to, it sounds as if they had been feeding this service drop with two of the transformers along the line. Their idea was that if one Tfmr had a problem the other would keep feeding. I have never heard of this. Maybe Charlie knows about this strategy.
The result was that currents in the line behind the client's house were unbalanced and the resulting net current created the fields in their house. Leaving aside the phases, the service drop neutral had two ways to go once it reached the secondary line.
The utility's fix was to feed from just one Tfmr (what a fantastic idea!) and the net current and its field were gone.
Any comments about this double feed?
Karl