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When a breaker trips each time a wall switch is turned on, it suggests that there may be an electrical fault often indicated by a short circuit. In this scenario, checking the wiring connections for shorts is crucial. Shorts can occur when the hot wire comes into contact with the ground wire or another wire, causing excessive current to flow. This overload creates a fault condition that triggers the breaker to trip as a safety mechanism to prevent overheating or potential fire hazards.

When troubleshooting, technicians should inspect the wiring connected to the switch and any devices or fixtures it controls to identify any visible signs of damage, frayed wires, or incorrect connections. Finding and rectifying such shorts in the wiring is essential for restoring safe operation of the switch and preventing future circuit interruptions.

Ensuring the integrity of the wiring connections is a fundamental aspect of electrical maintenance and safety, making it the most pertinent check in this situation.