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Motors and voltage drop

Chris Pearson
I feel that I ought to know the answer to this one ...


Typically my woodworking machines draw about 6 times the rated current on start-up. So when checking for voltage drop, should I use the rated current (i.e. when on load) or the starting current?


In my particular case, there is no problem because the origin is in the workshop. However, a friend has told me that he has used a whole drum of cable (4 mm 2 for two circuits) and the biggest machines are furthest away. I would be interested to see whether he may expect starting problems. Least cost is his main priority in life.
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    525.203 says that voltage drops higher than the usual 5% etc are permitted during motor starting & similar provided the v.d. it still within what the equipment will tolerate. So I'd say use just the rated current.


    That does beg the question where other equipment will also be affected (e.g. when sharing a submain) whether you'd need to consider that equipment's tolerance too...


      - Andy.
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    525.203 says that voltage drops higher than the usual 5% etc are permitted during motor starting & similar provided the v.d. it still within what the equipment will tolerate. So I'd say use just the rated current.


    That does beg the question where other equipment will also be affected (e.g. when sharing a submain) whether you'd need to consider that equipment's tolerance too...


      - Andy.
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