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Old 01-17-2012, 04:20 PM   #1
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220v from two sources


I am going to install a pump in my back yard which I will share with my neighbor. We will use a pump start relay to start the pump when our sprinkler controllers send it 24 v current. I will have 220v ran to the relay from my house, and he will have 220v ran to the relay from his house. We will use it on alternate days so we will not be trying to use it at the same time. However, if we accidently try to use it at the same time, sending 220v from both houses, will there be an electrical problem?

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Old 01-17-2012, 04:22 PM   #2
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220v from two sources


Yep, things could go boom!

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Old 01-17-2012, 04:23 PM   #3
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220v from two sources


Quote:
Originally Posted by doug65
I am going to install a pump in my back yard which I will share with my neighbor. We will use a pump start relay to start the pump when our sprinkler controllers send it 24 v current. I will have 220v ran to the relay from my house, and he will have 220v ran to the relay from his house. We will use it on alternate days so we will not be trying to use it at the same time. However, if we accidently try to use it at the same time, sending 220v from both houses, will there be an electrical problem?
Yes a big bang
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Old 01-17-2012, 05:25 PM   #4
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220v from two sources


I would only have 1 240 volt source (yours or his) and make a nominal payment to the other for the power used.

If you have to have 2 power source you need a lockout relay arrangement so only 1 source can be used at a given time.
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Old 01-17-2012, 06:14 PM   #5
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220v from two sources


You can set this up using two relays. You need one DPDT relay, and one DPST. The DPDT relay will select which source powers the pump, and also turn the pump on for the neighbor's system. The DPST relay will turn the pump on for your system. Here's how it gets wired: Run your power to the DPST relay, and from the DPST relay to the normally closed contacts of the DPDT relay. Connect your sprinkler system's controller to the coil of the DPST relay. Connect power from your neighbor's house to the normally-open contacts of the DPDT relay, and its coil to your neighbor's controller. The pump is connected to the common contacts of the DPDT relay.

When your system calls for water, it closes the DPST relay, which powers the pump through the normally-closed contacts of the other relay. When your neighbor's system calls for water, the second relay is actuated and the pump is powered from his house. This arrangement gives priority to his system, so if you both call for water at the same time his panel supplies the power. I think this is the simplest solution. Of course, you can use two identical DPDT relays and just ignore the normally-closed contacts on the first one.

Be sure to label the equipment as being supplied by two separate services! You need to have disconnects for both power supplies at the equipment.

Last edited by mpoulton; 01-17-2012 at 06:18 PM.
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Old 01-17-2012, 11:54 PM   #6
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220v from two sources


If the control voltage is 24v DC,
Then there will be no problems
provided you use diodes.

The low voltage dc from one place comes in
and goes to one diode the other side of the diode
goes to the relay coil.

The low voltage dc from place two comes in
and goes to diode two, the other side goes to,
the relay coil just like the other diode.

So to work,
RELAY COIL MUST BE DC OPERATED !
MUST BE VIA DIODES.
IF IT IS AC OPERATED, IT WILL NOT WORK !
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Old 01-18-2012, 01:43 AM   #7
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220v from two sources


First, sprinkler controls are 24VAC, not DC. Second, he wants to power the pump from two different sources, so using one relay with diode isolation isn't going to do it.

Quote:
Originally Posted by dmxtothemax View Post
If the control voltage is 24v DC,
Then there will be no problems
provided you use diodes.

The low voltage dc from one place comes in
and goes to one diode the other side of the diode
goes to the relay coil.

The low voltage dc from place two comes in
and goes to diode two, the other side goes to,
the relay coil just like the other diode.

So to work,
RELAY COIL MUST BE DC OPERATED !
MUST BE VIA DIODES.
IF IT IS AC OPERATED, IT WILL NOT WORK !
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Old 01-18-2012, 11:08 PM   #8
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220v from two sources


You could try this _
Use a 7 day digital timer in the pump shed,
The 7 day timer will control a DPDT relay,
This relay will send power to the pump,
Day 1 source 1.
Day 2 source 2.
Day 3 Source 1.
Day 4 Source 2.

And so on.

Not too difficult !

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