Two Way Switch Connection For Water Pump. At your switch box connect a double pole double throw switch in place of the existing switch. You may consider that both homes will have access to the water regardless of which generator will be providing the power so this idea may.
Working on two way switching is given in the table given below.
Working on two way switching is given in the table given below. The middle terminals of the dpdt switch connect to the original cable down to the pump junction. This would function similar the same way as a transfer switch with two lines in and one load out. In the pump room junction box connect the other apartment original cable to the new cable.