Odysseus99
Member
I read this excellent thread from 2007 on this forum on this issue:
https://terrylove.com/forums/index.php?threads/2-wire-vs-3-wire-pumps.14991/
It really looks like 2 wire is best for me. I'll use a 1hp 7gpm with 300 ft static level and 350 ft total dynamic head. I need to string 750 feet of wire from pump to power, so the wire cost is significant.
Two questions-
Lightning- Where I am there is a fair amount of lightning. Well could be hit. Is a 2 wire pump MORE subject to lightning damage than a 3 wire? Not the control box, the pump. Do 3 wire pumps get damaged by lightning too?
Wire ampacity- I've read a few passing remarks that the wire on 2 wires needs to be larger than on 3 wire, but there is only one wire size chart, not two separate charts, one for 2 wire pumps and one for 3 wire. So what does this mean? With a 2 wire you should just be cautious to oversize if you are near the limit on a given wire size?
Here's one wire chart-
http://www.deanbennett.com/submersible-pump-wire.htm
Shows that for 1hp #10 wire should be used only up to 630 feet. Valveman thinks I should use #12wire down the casing, because Franklin says that a minimum wire size actually reduces start torque for 3wire pumps. That's interesting. But, if I use a 1hp 2 wire at 750 feet, by the chart I should use #8 wire.
Thoughts?
And THANKS for your input. Greatly appreciated.
https://terrylove.com/forums/index.php?threads/2-wire-vs-3-wire-pumps.14991/
It really looks like 2 wire is best for me. I'll use a 1hp 7gpm with 300 ft static level and 350 ft total dynamic head. I need to string 750 feet of wire from pump to power, so the wire cost is significant.
Two questions-
Lightning- Where I am there is a fair amount of lightning. Well could be hit. Is a 2 wire pump MORE subject to lightning damage than a 3 wire? Not the control box, the pump. Do 3 wire pumps get damaged by lightning too?
Wire ampacity- I've read a few passing remarks that the wire on 2 wires needs to be larger than on 3 wire, but there is only one wire size chart, not two separate charts, one for 2 wire pumps and one for 3 wire. So what does this mean? With a 2 wire you should just be cautious to oversize if you are near the limit on a given wire size?
Here's one wire chart-
http://www.deanbennett.com/submersible-pump-wire.htm
Shows that for 1hp #10 wire should be used only up to 630 feet. Valveman thinks I should use #12wire down the casing, because Franklin says that a minimum wire size actually reduces start torque for 3wire pumps. That's interesting. But, if I use a 1hp 2 wire at 750 feet, by the chart I should use #8 wire.
Thoughts?
And THANKS for your input. Greatly appreciated.