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Make a safety plug to prevent shock for testing the repaired device (Safety plug protection against shock.) When repairing electrical appliances, when the repair is complete, there must be a test, testing the use of the device. This is to prevent mistakes from repairing, such as practicing repairs or not yet having expertise in repairing or connecting wires, causing a shock or short circuit. But making this plug will be a protection. When a mistake occurs, it will not cause a shock.