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10.3 Transformer capacity required for three-phase submersible motors
* Pump motor KVA requirements only, and does not include allowances for other loads.
10.4 Submersible drop cable selection charts (60 Hz)
The following tables list the recommended
copper conductor sizes and various cable
lengths for submersible motors.
These tables comply with the 1978 edition of the
National Electric Table 310-16, Column 2 for
+167 °F (+75 °C) wire. The ampacity (current
carrying properties of a conductor) have been
divided by 1.25 per the N.E.C., Article 430-22,
for motor branch circuits based on motor amps
at rated horsepower.
To ensure adequate starting torque, the
maximum cable lengths are calculated to
maintain 95 % of the service entrance voltage at
the motor when the motor is running at
maximum nameplate amps. Cable sizes larger
than specified may always be used and will
reduce power consumption.
3-phase motor
[Hp]
Minimum total KVA
required*
Minimum KVA rating for each transformer
Two transformers Open
Delta or Wye
Three transformers Delta
or Wye
1.5 3 2 1
24 2 1.5
35 3 2
57.5 5 3
7.5 10 7.5 5
10 15 10 5
15 20 15 7.5
20 25 15 10
25 30 20 10
30 40 25 15
40 50 30 20
50 60 35 20
60 75 40 25
75 90 50 30
100 120 65 40
125 150 85 50
150 175 100 60
200 230 130 75
CAUTION
The use of cables smaller than the
recommended sizes will void the
warranty. Smaller cable sizes will
cause reduced starting torque and
poor motor operation.
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