||10-01-2011 09:30 PM
ok check your driven ground rods, look for loose or broken ground wire
Originally Posted by Schlominator
I tested the main breaker that feeds the sub and got 240 across and 120 to neutral or ground. I will do it again with something connected and have someone plug it in and out in garage and see if it fluctuates.
I'm getting 120 through each line in the sub, but don't know how to test the neutral between the sub and main. Could it be a break in this line? It is underground and we have had a lot of ground shifting due to drought and finally a little rain.
It is a 3 conductor from main to a detached garage. No problems noticed in the house.
I get 240 or 120 when nothing is plugged in or turned on in the garage. Lower voltage when something is on, but not working.
I have been looking for a bad neutral in the garage but don't know how to track it down.
Thanks again, all.
Ok You should Have A seperate driven ground rod at each panel (main and sub) Your readings are good, but,once a load is applied they fluctuate, right? check your ground connections at driven electrode, loose or broken? Also check if garage panel neutral is bond to ground.