George vonB
Member
Could the high EMG readings be due to problems with the incoming power line from the street, to our house, rather than internal wiring errors?
What I did:
1. Switch off main breaker. Wait 10 minutes, let any fields collapse.
a. No difference in EMF readings. 2-4 ft. around panel area readings remain at about 100mG.
2. Measure water pipe near service panel for current using clamp meter.
a. 0.6 Amps
3. With mains still off, disconnect #2 stranded GND wire running from service panel, to water pipe. Measure current and EMF.
a. Current is 0.00 Amps, EMF stays same ~100mG.
b. Touch GND wire to pipe. Current rises to 1.5 Amps. No voltage detected between pipe and GND wire.
Measured EMF outside home from service box meter and along 130 foot driveway where incoming cable is buried. Weather is very wet and humid due to earlier thunderstorms. At ground level, EMF readings were >100 all along driveway, on surface of the street and at pole.
The next morning, cooler and less humid, readings had dropped down to around 30mG all along driveway and street. Readings near the service panel had dropped from 100mG, to around 30mG and at a centerpoint in our sitting room, about 6mG, to 1-2mG.
Thoughts?
What I did:
1. Switch off main breaker. Wait 10 minutes, let any fields collapse.
a. No difference in EMF readings. 2-4 ft. around panel area readings remain at about 100mG.
2. Measure water pipe near service panel for current using clamp meter.
a. 0.6 Amps
3. With mains still off, disconnect #2 stranded GND wire running from service panel, to water pipe. Measure current and EMF.
a. Current is 0.00 Amps, EMF stays same ~100mG.
b. Touch GND wire to pipe. Current rises to 1.5 Amps. No voltage detected between pipe and GND wire.
Measured EMF outside home from service box meter and along 130 foot driveway where incoming cable is buried. Weather is very wet and humid due to earlier thunderstorms. At ground level, EMF readings were >100 all along driveway, on surface of the street and at pole.
The next morning, cooler and less humid, readings had dropped down to around 30mG all along driveway and street. Readings near the service panel had dropped from 100mG, to around 30mG and at a centerpoint in our sitting room, about 6mG, to 1-2mG.
Thoughts?
