Appendix 1 Procedure for Investigating Power Supply Quality
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Appendix
Record voltage and current trends at the power circuit inlet.
If current consumption in a building is high while the voltage is low, the cause likely lies inside the build-
ing. If the voltage and current are both low, the cause is likely to lie outside the building. It's extremely
important to select the right measurement locations and to measure current.
Check power trends.
Overloaded equipment can cause problems. By understanding power trends, you can more easily iden-
tify problematic equipment and locations.
Check when the problem occurs.
Equipment that is operating or turning off or on when abnormalities (events) are recorded may be prob-
lematic. By understanding the precise times at which abnormalities (events) start and stop, you can more
easily identify problematic equipment and locations.
Check for heat and unusual sounds.
Motors, transformers, and wiring may produce heat or unusual sounds due to causes such as overload-
ing or harmonics.
Advice for identifying the cause of abnormalities
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