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BT Electric said:
One issue I have found in paper mills that are pre 1960's is that many of the motor starters have 480V control voltage, usually just 2 phases from the starter to the push buttons in the control panel. Dangerous and not always marked clearly. On/off controls for pumps sometimes will not shut off when a high resistance ground is present on the phases used. Same for reversing starters.
And I thought most old paper mills were 575V. May it's a northern thing?
 
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