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# vac difference between legs of service

#1
05-28-18, 10:42 AM
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Join Date: Apr 2018
Location: usa
Posts: 69
vac difference between legs of service

How much difference in voltage between the two legs of a service, seen while under load, would you suspect a loose neutral? How much would you say is normal?

note I am saying under load, I would suspect both sides should be within a volt not under load.

#2
05-28-18, 10:57 AM
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Under no load...... the voltages should be almost the same.
Depending on the load.... I would say no more than a 10 volt difference.

A 240v load will not unbalance the legs.
A heavy 120v load can cause an imbalance.
The further you are from the utility transformer the greater the drop.

#3
05-28-18, 11:07 AM
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Depending on the loads the voltage swing can be quite a bit.

#4
05-28-18, 11:36 AM
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Join Date: Apr 2018
Location: usa
Posts: 69
And is the push/pull effect normal?

for example a hair dryer might bring one leg DOWN 2 vac and the other side RAISES 2 vac.

#5
05-28-18, 11:40 AM
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Correct. If one leg goes down by 30 volts the other leg goes up 30 volts.

#6
05-28-18, 05:08 PM
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Join Date: Mar 2010
Location: USA
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I would say that if the other leg goes up by more than five volts then you should assume you have a broken neutral problem.

If the leg you are using a lot of power on goes down by several volts and the other leg also goes down by a volt or two then you do not have a neutral problem.

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