If N-G resistance is high and voltages under load are good, that implies the bad connection is in the grounding wire path. A high resistance doesnt affect voltage readings when no current flows. A meter doesnt drag down the voltage because it has virtually no load. Try running a load from hot to ground instead of hot to neutral and see if that heavy load functions (a big power saw is a good test because you can tell if it doesn't sound right).
High resistance reading neutral to equipment ground
- Thread starter RRonke
- Start date
- Status
AC\DC
Senior Member
- Location
- Florence,Oregon,Lane
- Occupation
- EC
How did you test for L-N on each phase. You need to have a Large current imbalance on one phase to find help find a voltage swing.
tun on all A phase and find what’s working and load it up, the. Take your reading, and then swap it. bring a heater and heat Gun to help. Don’t rely on the power company to find it they generally never do in my area.
tun on all A phase and find what’s working and load it up, the. Take your reading, and then swap it. bring a heater and heat Gun to help. Don’t rely on the power company to find it they generally never do in my area.
kwired
Electron manager
- Location
- NE Nebraska
And they shouldn't be expected to find resistance from neutral to EGC, that has to be something load side of service equipment.
synchro
Senior Member
- Location
- Chicago, IL
- Occupation
- EE
Perhaps I missed it, but in this thread I haven't seen that the N-G voltage was measured on the problem branch circuit. As kwired mentioned in post #5, if the branch circuit came from a subpanel then there might be a voltage drop on its feeder neutral due to the current in other branch circuits. Although a multi-meter measures resistance by applying a DC current, measuring the resulting DC voltage, and then using R = V /I, if there was any AC voltage present that might mess up the resistance measurement. That's why the N-G voltage should be measured first to confirm that it's negligible. Since this has been a problematic case, it might be best to make a DC voltage measurement as well as an AC one on N-G.
Unless it's already been done, turning off the main breaker before making the N-G the resistance measurement should eliminate the possible neutral voltage drop issue from other circuits that's mentioned above.
Unless it's already been done, turning off the main breaker before making the N-G the resistance measurement should eliminate the possible neutral voltage drop issue from other circuits that's mentioned above.
- Occupation
- Licensed Electrician
Normal voltage drop on a feeder neutral and/or a branch circuit is not going to blow up a television set.
synchro
Senior Member
- Location
- Chicago, IL
- Occupation
- EE
No, but it might be messing up the OP's N-G resistance measurements and therefore causing him to go on a "wild goose chase" if his measurements of 33 to 98 ohms are not valid.
AC\DC
Senior Member
- Location
- Florence,Oregon,Lane
- Occupation
- EC
If a tv really did blow up then it’s either a lose neutral connection on a multi wire, loses neutral connection at sub/main/meter, or at the pole. Every time I have these issue it’s the power company problem.
Though if his reading are correct .You would be right it would not be a power company issue
Strathead
Senior Member
- Location
- Ocala, Florida, USA
- Occupation
- Electrician/Estimator/Project Manager/Superintendent
Just saying you checked to voltages doesn't mean anything. The voltages need to be checked with loads. Preferably unbalanced ones.
- Status