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Drop Wire Selection Table for Deep Well Pump |
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|
Motor Rating (Single Phase) |
Cable Size / Maximum run in feet |
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|
HP |
Voltage |
#14 |
#12 |
#10 |
#8 |
#6 |
#4 |
#2 |
|
1/2 |
115V |
100' |
160' |
250' |
390' |
620' |
960' |
1460' |
|
1/2 |
230V |
400' |
650' |
1020' |
1610' |
2510' |
3880' |
5880' |
|
3/4 |
230V |
300' |
480' |
760' |
1200' |
1870' |
2890' |
4370' |
|
1 |
230V |
250' |
400' |
630' |
990' |
1540' |
2380' |
3610' |
|
1 1/2 |
230V |
190' |
310' |
480' |
770' |
1200' |
1870' |
2850' |
|
2 |
230V |
150' |
250' |
390' |
620' |
970' |
1530' |
2360' |
|
3 |
230V |
120' |
190' |
300' |
470' |
750' |
1190' |
1850' |
|
5 |
230V |
0 |
0 |
180' |
280' |
450' |
710' |
1110' |
|
7.5 |
230V |
0 |
0 |
0 |
200' |
310' |
490' |
750' |
|
10 |
230V |
0 |
0 |
0 |
0 |
250' |
390' |
600' |
|
15 |
230V |
0 |
0 |
0 |
0 |
0 |
270' |
530' |
|
Motor Rating (Three Phase) |
Cable Size / Maximum run in feet |
|||||||
|
HP |
Voltage |
#14 |
#12 |
#10 |
#8 |
#6 |
#4 |
#2 |
|
2 |
230V |
300' |
480' |
760' |
1200' |
1880' |
2930' |
4470' |
|
3 |
230V |
210' |
340' |
540' |
860' |
1340' |
2080' |
3170' |
|
5 |
230V |
0 |
200' |
320' |
510' |
800' |
1240' |
1900' |
|
7.5 |
230V |
0 |
0 |
230' |
360' |
570' |
890' |
1350' |
|
10 |
230V |
0 |
0 |
0 |
270' |
420' |
660' |
1010' |
|
15 |
230V |
0 |
0 |
0 |
0 |
290' |
450' |
690' |
|
20 |
230V |
0 |
0 |
0 |
0 |
0 |
350' |
530' |
|
25 |
230V |
0 |
0 |
0 |
0 |
0 |
260' |
430' |
|
30 |
230V |
0 |
0 |
0 |
0 |
0 |
0 |
350' |
|
2 |
460V |
1300' |
2070' |
3270' |
5150' |
8050' |
0 |
0 |
|
3 |
460V |
1000' |
1600' |
2520' |
3970' |
6200' |
0 |
0 |
|
5 |
460V |
590' |
960' |
1500' |
2360' |
3700' |
5750' |
|
|
7.5 |
460V |
420' |
680' |
1070' |
1690' |
2640' |
4100' |
6260' |
|
10 |
460V |
310' |
500' |
790' |
1250' |
1960' |
3050' |
4680' |
|
15 |
460V |
0 |
0 |
540' |
850' |
1340' |
2090' |
3200' |
|
20 |
460V |
0 |
0 |
430' |
650' |
1030' |
1610' |
2470' |
|
25 |
460V |
0 |
0 |
0 |
530' |
830' |
1300' |
1990' |
|
30 |
460V |
0 |
0 |
0 |
430' |
680' |
1070' |
1640' |
|
40 |
460V |
0 |
0 |
0 |
0 |
0 |
790' |
1210' |
|
50 |
460V |
0 |
0 |
0 |
0 |
0 |
640' |
980' |
Can you combine drop wires of different gauge?
Yes! You may combine, 2 or more, different gauged (AWG) wire for your installation. Use the formula below to ensure that National Electrical Code (NEC) requirements are met.
Formula:
(Wire1 Length ÷ Max Run1) + (Wire2 Length ÷ Max Run2) + ... ≤ 1.00
Where maximum run is the maximum length permitted for that specific gauge of wire. See our drop wire selection table for maximum run information.
Example:
You have 375 feet of #6 wire buried between the service entrance and the wellhead. A new 3HP 230V single phase pump will be installed to replace a smaller pump. The new pump will be set at 200 feet below the wellhead.
What wire gauge is suitable?
From the drop wire selection table, #6 can be use for up to 750 feet and #10 for up to 300 feet, (375 ÷ 750) + (200 ÷ 300) = 1.167 which is greater than 1, so #10 can’t be used; #8 wire can be used for up to 470 feet. Using the same formula, (375 ÷ 750) + (200 ÷ 470) = 0.9255, this is less than 1 and will meet NEC standards.
Continuing from the example above…
In the same installation, you also have 110 feet #10 submersible wire from your existing well. Can you add 90 feet wire to achieve 200 feet? What wire gauge?
The answer is yes, and you can use 90 feet #6 wire.
(375 ÷ 750) + (110 ÷ 300) + (90÷750) = 0.9866
Now the decision is whether to buy a brand new 200 feet of #8, or 90 feet of #6. Check the prices for each wire to make a smart decision.