Submersible Drop Cable Selection Chart (60 Hz) - Grundfos SP Instrucciones De Instalación Y Funcionamiento

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10.4 Submersible drop cable selection
chart (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 assure 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.
The use of cables smaller than the
recommended sizes will void the
Caution
warranty. Smaller cable sizes will
cause reduced starting torque and
poor motor operation.
Volts
Hp
14
.33
130
115
.5
100
.33
550
.5
400
.75
300
1
250
1.5
190
230
2
150
3
120
5
7.5
10
Notes:
1. If aluminum conductors are used, multiply lengths by 0.5. Maximum allowable length of aluminum
is considerably shorter than copper wire of the same size.
2. The portion of the total cable which is between the service entrance and a ∅3 motor starter should
not exceed 25 % of the total maximum length to assure reliable starter operation. Single-phase
control boxes may be connected at any point of the total cable length.
3. Cables #14 to #0000 are AWG sizes, and 250 to 300 are MCM sizes.
26
Single-phase motor maximum cable length [ft]
(Motor to service entrance) (2)
12
10
8
6
210
340
540
840
160
250
390
620
880
1390
2190
3400
650
1020
1610
2510
480
760
1200
1870
400
630
990
1540
310
480
770
1200
250
390
620
970
190
300
470
750
180
280
450
200
310
250
Wire size
4
2
0
00
1300
1960
2910
960
1460
2160
5250
7960
3880
5880
2890
4370
6470
2380
3610
5360
6520
1870
2850
4280
5240
1530
2360
3620
4480
1190
1850
2890
3610
710
1110
1740
2170
490
750
1140
1410
390
600
930
1160
000
0000
250
300

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