In order for deep well pumps to function properly, it is necessary to match them with appropriate control cables. In this way, we will avoid numerous problems with power supply and control, enjoying the good condition of the pumps. In the following guide, we will discuss the most important aspects related to the selection of control cables, including the reasons for the use of short cables by manufacturers. We will also write about the appropriate cross-section and length of cables, as well as present a diagram of connecting the control cable to the deep well pump. We invite you to read!
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Why do submersible pump manufacturers use short cables?
A submersible pump is an essential device that helps to draw water from very great depths. Equipped with cables, which are, however, quite… short. Why are such solutions used? This is not a coincidence, it is carefully thought out, especially because shortening the cable length minimizes voltage losses. This is especially useful in the situation of powering devices that are located very deep underground. This ensures better operation. Longer cables, on the other hand, can reduce efficiency, but also increase the risk of damaging this equipment.
Shorter cables are also easier to install and less susceptible to mechanical damage. This affects their durability. Another reason is cost, as shorter cables mean lower material costs.
What cross-section should the control cable for a submersible pump have?
As we can see, deep well pumps operate reliably if they are equipped with appropriate control cables. Their cross-section is particularly important. Usually, cables with a cross-section of 1.5 mm2 to 2.5 mm2 are recommended for standard applications, depending on the pump power and cable length. Choosing a smaller cross-section can lead to problems - heating of the cable, which increases the risk of insulation damage and, consequently, failure.
For longer distances or higher pump powers, it is a good idea to consider a larger cross-section to reduce voltage losses while ensuring stable power supply. Regardless of the cross-section chosen, control cables should always be of high quality. We must pay attention to the manufacturer, as well as whether the control and signal cables comply with applicable standards.
How long should the control cable be for a submersible pump?
Without a doubt, if we want to draw water from a deep well, we must rely on a proven model, both when it comes to the pump and control cables. The length of the cable is of great importance here. As we have already written, it is recommended to keep it as short as possible to minimize voltage losses and also to avoid potential interference in the control signal.
The standard length is from 10 to 30 meters, depending on the depth of the well and the location of the controller. If we have a deeper borehole or more complicated installations, the cable may be longer. In this situation, however, it is worth having cables with a larger cross-section, which will compensate for voltage losses. It is also extremely important that the cable is properly protected against mechanical damage, as well as against the impact of water.
Control cable connection diagram for submersible pump
How we connect the control cable to the submersible pump is crucial to its operation. The most important thing here is the right diagram. The first thing we need to know is to connect the control cable to the controller or control panel. It allows you to turn the pump on and off, as well as monitor its operation.
When it comes to standard connections, remember that the phase wire, brown or black, should be connected to the power terminal in the pump. The neutral wire (blue) should be connected to the neutral terminal. The control wires, usually yellow-green as ground, should be connected to the control system. Of course, this is a general diagram, but they may vary depending on the pump model. So we should always refer to the manufacturer's recommendations.