What is the incorrect method to prevent workers from getting shocked?

The method involving ensuring equipment is protected by metal shells is considered incorrect for preventing workers from getting shocked because, while metal casings can provide some degree of protection against accidental contact, they also pose a risk if they become energized due to a fault. If the metal shell is not properly grounded or if there is a failure in the insulation, it can lead to a dangerous situation where the casing itself carries electrical current, thereby shocking anyone who touches it.

On the other hand, using waterproof plugs helps reduce the risk of electrical shock in wet environments, where moisture can create a pathway for electricity to flow. Avoiding improper extension wiring ensures that electrical connections are secure and that wiring can handle the required load, preventing overheating and faults. Installing electrical leakage breakers provides an additional layer of safety by cutting off power when a fault is detected, thereby interrupting the circuit and reducing the risk of shock. Each of these approaches contributes positively to overall electrical safety in the workplace.