210.4 opinion

[Fred B]

House 1 is original house and has the pressure switch but distance is over 300ft to well and well 475ft deep so wishes to power the pump from the new house 2 under construction that is only 75ft to well. This is a concern to the customer so wishes to do the following. House 2 will now have a 400A meter disconnect to power both bldg. moved from a pedestal in mid yard.

Customer proposes this installation in drawing. House 1 to keep 120V power to pressure switch from house 1 source panel. Power to well pump receive power from house 2 panel through a contactor to be located at house 2. Conduit exists between all structures as he plans to run the 120V contactor control from house 1 to house 2.
I see this as an issue with 210.4(A) All conductors of a multiwire branch circuit shall originate from the same panelboard or similar distribution equipment. and (B)
Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect all ungrounded conductors at the point where the branch circuit originates. As well as an issue with 430.75(A)

 

[Dennis Alwon]

This makes no sense. I can see 120v for lights and receptacle but if your pump is 240v it needs 240v. What is the purpose of the 120v? Is there going to be 2 pumps?

 

[Fred B]

Don't know either, claims the contactor is 120V controlling 240V on controlled side. Some existing setup from his old pedestal and house 1. I've never seen a 120V pressure switch either.
He wants the pressure switch to simply control the contactor and the contactor to switch the pump.
Worried about "noise" of neutral onto his audio equipment in his new house 2.
Haven't seen any of the equipment yet.

 

[ptonsparky]

The pressure switch doesn't care what the voltage is. We know that.
Put the pressure switch at house 1 and make the control 24v AC or DC from House 2.
PVC conduit.

 

[Dennis Alwon]

It appears they want to leave the pressure switch in house one and feed it from house 2. In my opinion, it can easily be done without a contactor but not sure about the legality of the house 1 having power from house 2.

I see what they are doing, now...haha The 120v contactor is controlling the contactor for the 240v. You still have 2 power sources coming into the well house. I suppose a disconnect for each one may make it safe

 

[jap]

I'd relocate the pressure switch to the pump house where the controller is located if I could and let the drop in water pressure control the demand for the water to whatever buildings the pump was servicing.

That's the way it is in my area anyway.

Having to have a remote 120v control signal from each individual structure to pull in the pump seems like a pain to me.

Oh "well".

Jap>

 

[Strathead]

House 1 is original house and has the pressure switch but distance is over 300ft to well and well 475ft deep so wishes to power the pump from the new house 2 under construction that is only 75ft to well. This is a concern to the customer so wishes to do the following. House 2 will now have a 400A meter disconnect to power both bldg. moved from a pedestal in mid yard.

Customer proposes this installation in drawing. House 1 to keep 120V power to pressure switch from house 1 source panel. Power to well pump receive power from house 2 panel through a contactor to be located at house 2. Conduit exists between all structures as he plans to run the 120V contactor control from house 1 to house 2.
I see this as an issue with 210.4(A) All conductors of a multiwire branch circuit shall originate from the same panelboard or similar distribution equipment. and (B)
Each multiwire branch circuit shall be provided with a means that will simultaneously disconnect all ungrounded conductors at the point where the branch circuit originates. As well as an issue with 430.75(A)



View attachment 2567823

Unless I am missing something, it is confusing, you don't have a multiwire branch circuit. A multiwire branch circuit is minimum of 2 hots and a neutral. You have a 120v circuit and a 240 volt circuit. The contactor coil will be the only 120V load, via the pressure switch, and the pump will be the only 240V load, via the contactor contacts. No different than a motor with a control circuit at 120 and motor at 480

 

[tortuga]

If the 120V is only a control circuit could you could calssify it as a class1 control circuit?
Or I'd run a 3 wire 30A feeder from house 2, set a panel at the well house so you could have GFCI and a light, then rewire the control circuit so it starts there.