starting a 1 HP well pump with a VFX3648 [RE-wrenches]

[Drake Chamberlin]

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At 02:21 PM 1/26/2007, you wrote:
>9 Table 8 and find the wire
>size--ohms/1000 feet and calculate the volt drop VD= I
>x ohms/kft x (total ft round trip)/1000, This should
>not bemore than 3 or 5%

The resistance isn't quite as bad as table 8 makes it look, since the 
resistance in the table is for wire at  75 degrees C, or 168 degrees 
F.  There is a formula at the bottom of the chart for converting to 
the temperature that the wire will be operating at.  Since the wire 
is underground for part of its run, and then underwater for remainder 
of its run, it should be safe to use 70 degrees F.

  On the other hand, the pump is a reactive load, which complicates 
things a bit further. Table 9 has AC reactance values, but these are 
for 3 phase circuits.

Don't the pump specifications give information on wire size for 
distance directly, or do they make the installer calculate it?

Drake  


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