Voltages are rarely perfectly balanced in threephase systems. Although small unbalances are not usually a problem, if this unbalance becomes too great then the unbalance can cause problems especially for three-phase motors or compressors. Fortunately unbalance is easy to measure with PMI three-phase Boomerangs and Revolutions with Canvass. Canvass provides the tools to help identify and locate the source of voltage unbalance problems.
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