Take key voltage and current readings at panelboards and other supply points while the existing line is operating. After the move is complete, you can compare the pre-move readings to readings taken after the move to validate the new setup and to troubleshoot if necessary.
While you are taking the readings, look for any circuits at or near their limits, so you can add capacity to the new Tin can making machinery production line or redesign as needed.
Although taking key voltage and current readings before the move is useful, doing a power quality survey is even better because it gives you a complete picture of the state of the electrical system, including any harmonics, voltage sags, and other problems. Just as when taking voltage and current readings, look for existing problems in the initial power quality survey so you can correct them in the new layout.
Whether you choose to take just key readings or to do a complete power quality survey, be sure to look for voltage imbalances at panelboards, because voltage imbalances can cause three-phase transformers and motors to overheat. You can use a handheld digital multimeter (DMM) or a power quality analyzer to check for variations between the phase voltages in a three-phase system. When using a DMM, any phase voltage reading that deviates by more than 1 percent to 2 percent from the average value warrants corrective action. Power quality analyzers provide a more detailed analysis. The solution for unbalanced voltages is to distribute single-phase loads evenly across all three phases at panelboards and switchboards.
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