Many of the ideas for my column are inspired by questions I get from readers and friends in the industry. A few weeks ago, someone asked how to wire in a pressure switch with a pump protection device that required a control relay. The pump protector’s internal relay was rated at 10 amps, sufficient for a 1 horsepower, 230 volt pump but not enough to handle his 3 horsepower pump motor directly, so an additional relay was called for.
During the next few months, we will focus on the electrical side of pumped water systems. We start by looking at the components in two-wire and three-wire single-phase systems, explaining the purpose, function and options available for each.