The owner of a company needs to install a transformer to power his electrical equipment. He operates three units of machinery that require a running current of 40A each. These appliances require at least twice their running current for starting, and the transformer chosen must account for this. What is the minimum current load that his transformer of choice must be able to carry? Let's answer step by step:
Three units require a running current of 40A each for a total current load of 3 * 40A = 120A. They require twice 120A for starting which is 2 * 120A = 240A which is the minimum current load that the transformer must be able to carry. The answer: 240.