Voltage Drop Multiple Legs

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Voltage Drop With Multiple Legs

There are situations where a run of a conductor must travel over a great distance like parking lot lighting and street lighting. In a situation like these, there are loads located different distances from the source on the same circuit. So the calculation becomes a multi part one where each leg is calculated separately based on the change in load current and the change in wire size.

The calculation for a problem like this is nothing more than separate calculations for each leg based on distance and wire size. 

When each leg has been calculated, then the total voltage drop can be determined by adding the voltage drop of each leg. This amount should not exceed the recommendations of the NEC or provide less voltage than each apparatus requires for proper operation.

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