VOLTAGE DROPS

[Abraham2015]

We are having problems with an electrical panel. It's a single phase 120 volt panel. Two hot legs and one neutral coming into the panel. There are about 8 circuit breakers connected to the panel. We removed all of the wires from the circuit breakers and tested resistance of each circuit breaker in the on and off position. No issues detected. We then tested voltage across each circuit breaker and between phases. No issues. However, when we connected one circuit breaker, there was a voltage drop down to 90 volts. There is a similar problem with other circuits but not as severe. Some circuits suffer from over voltage of about 140 volts. Could this problem be caused by several loose connections or neutral wires? Any other ideas?

 

[ActionDave]

Bad neutral.

 

[don_resqcapt19]

We are having problems with an electrical panel. It's a single phase 120 volt panel. Two hot legs and one neutral coming into the panel. There are about 8 circuit breakers connected to the panel. We removed all of the wires from the circuit breakers and tested resistance of each circuit breaker in the on and off position. No issues detected. We then tested voltage across each circuit breaker and between phases. No issues. However, when we connected one circuit breaker, there was a voltage drop down to 90 volts. There is a similar problem with other circuits but not as severe. Some circuits suffer from over voltage of about 140 volts. Could this problem be caused by several loose connections or neutral wires? Any other ideas?

You have a neutral issue on the line side of the panel.

 

[user 100]

We are having problems with an electrical panel. It's a single phase 120 volt panel. Two hot legs and one neutral coming into the panel. There are about 8 circuit breakers connected to the panel. We removed all of the wires from the circuit breakers and tested resistance of each circuit breaker in the on and off position. No issues detected. We then tested voltage across each circuit breaker and between phases. No issues. However, when we connected one circuit breaker, there was a voltage drop down to 90 volts. There is a similar problem with other circuits but not as severe. Some circuits suffer from over voltage of about 140 volts. Could this problem be caused by several loose connections or neutral wires? Any other ideas?

As said above, bad noodle- Check any main neutral connections below and in meter can, (lugs can be deceptive) and if all else fails call the POCO- make sure to eye ball the SEC real good if possible (if drop is triplex for example).

 

[Abraham2015]

Thanks for all of your help guys.