Indian mains, why big venues have three-phase and why phase imbalance across a stage causes hum, what an RCCB actually does — and the one scenario every engineer should be able to describe before they set up a stage.
This lesson exists because of one scenario, and it is worth stating before any of the theory: a singer holding a microphone with one hand and touching a guitar with the other is bridging two separate grounds. If those grounds are at different potentials, the current path goes across their chest.
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