A hyper-power circuit was a high voltage circuit.

In 2266, while considering how to escape from confinement at the Tantalus colony, James T. Kirk asked Doctor Helen Noel if she had had any training in hyper-power circuits. When she responded in the negative, he cautioned her that if she touched the wrong power line, she would die. Noel remarked that she vastly preferred that possibility to Tristan Adams' treatment room. (TOS: "Dagger of the Mind")

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