Electricians frequently practice the safety rule of keeping one hand in their pocket or tucked behind their back when working on potentially live circuits to prevent electrical current from crossing the heart chamber. If a technician touches an energized conductor with both hands simultaneously while grounded, the electrical current enters through one hand, crosses the chest cavity directly through the heart muscle, and exits out the other hand. This pathway triggers immediate ventricular fibrillation and can be fatal. Keeping one hand isolated ensures that if an accidental contact occurs, the electrical current path remains confined to a single arm or limb, drastically reducing the risk of a lethal, heart-stopping shock during troubleshooting or maintenance tasks.
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