Electrical Reliability ensuring circuits will operate safely. This lowers Personnel, Asset and Insurance Risks.
The guidelines for periodic maintenance testing for Industrial Sector is Three years with a visual annually.
Results: The regulatory requirement is to take the highest measurement of the three phases and compare this absolute reading with the limits.
3Phi Reliability recommend in addition looking at the percentage imbalance. A reading >3% indicates a problem eg Contactor contact, Circuit Breaker contact, Isolator corrosion, or Termination/crimp. A imbalance >5% is a serious problem that requires fault finding.
A Motor Circuit test is recommended at the Motor for Winding condition.
This is an efficient method of finding high resistance defects that are hidden from view of Thermography.