![]() Splicing the drop cable during my early days of pump installation generally revolved around the size of motor along with the size and type of drop cable we were using. Therefore, the installer was usually forced to purchase the drop cable separately and attach-or “splice”-the cable onto the motor-lead This procedure was generally performed in the field right before the installation started and could take hours to complete. Two types of cable used for low voltage splicing.Įven from the early days of submersible pump and motor installation during the 1950s, there has always been an obvious disconnect between the factory boxed and packaged pump and motor unit and the drop cable that conveys power to the motor.Īlthough the unit was typically supplied with a pre-installed motor lead, it was generally impractical and burdensome to supply the pumping unit with the pre-spliced drop cable to the proper length, which could be several hundred feet. The Early Daysīut before moving into our discussion, let’s look at the various splicing and drop cable methods used since the inception of submersible pump motors. This means compactness has become even more important to a successful installation. However, drop cable now includes a fourth wire used as an equipment grounding conductor and many people are working to get more out of smaller wells by using larger pumps, which increases the overall size of the drop cable bundle. While most would agree with the first two items, many of you may be confused by and question the third. ![]() Electrical integrity and low resistance.In my opinion, there are three distinct elements that go into the so-called perfect underwater splice: This month’s edition of Engineering Your Business will outline the many facets involved in making the perfect splice and some precautions to avoid a bad splice. In most cases, we not only had to make our splices fail-proof, but as fast as possible to get the pump installed rapidly. Believe it or not, long before the advent of heat shrink tubing, one of the first tasks I learned also happened to be one of the principal ways pumpmen often distinguished themselves-the way we made our splices. This connection in a water well pumping installation is commonly referred to as the splice. Inadequate connections result in physically weak and high-resistance connections, which can cause damage or failure to an entire pumping system. One of the most overlooked but critical aspects of a successful submersible pump and motor installation is the electrical connection provided between the motor leads and submersible pump (drop) cable. There are three key elements that lead to the perfect underwater splice.
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