While an ear popping is a temporary annoyance, an undersized earth cable is a silent killer. The "earth" (or ground) cable is the safety net of an electrical system. In the event of a fault—where live current touches a metal casing—the earth cable provides a low-resistance path for the current to flow away, tripping the breaker and saving you from electrocution.
As a plane descends, the air pressure in the cabin rises. The air outside your ear pushes against your eardrum, creating a vacuum in the middle ear. Your body needs to let air into the ear to equalize the pressure. When it happens suddenly, you hear a pop or click—often followed by muffled hearing or pain. ears popping after flightearth cable size calculation