Originally posted by nesparky:
Time to look at load downstream. You may have loads that are not balanced from the sub panels. Look for harmonics and surge type loads. eg a shear or press that cycles its motor(s) on and off perhaps quickly.
On Saturday, when we changed the breaker, there was no equipment operating.....only lighting and HVAC. The HID lighting could be causing harmonics.....in fact, thats the first place I would look. But I don't understand how harmonics can affect paralleled feeders.
Can anyone explain this????
GJ
