What the Eagle™ Records
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Figure 23 – Loose Neutral Report
The primary symptom of a loose neutral condition is for one
voltage leg to rise in voltage, and the other to fall, with the sum of
the two voltages remaining close to twice the nominal voltage.
For example, if the voltages start at 119V and 121V, then move to
105V and 135V, a loose neutral is a likely cause: one leg went up,
one went down, and the sum is close to twice the nominal (240V).
This happens whenever the load is not balanced, and the neutral
is disconnected. If this condition is met for long enough, the loose
neutral report is triggered.
Trigger Logic
The loose neutral logic uses three parameters: duration, range,
and difference. These parameters are used to judge whether one
voltage leg has risen, and one fallen, while the sum remained the
same. The difference is a voltage that specifies the minimum
difference between the two legs. For example, with a loose
neutral where the difference is 16V; there must be at least a 16V
separation between the two legs. The range is a voltage that