Question

A worker was attempting to correct an electrical problem involving two non-operational lamps. He examined the circuit in the area where he thought the problem was located. He had not shut off the power at the circuit breaker panel and did not test the wires to see if they were live. He was electrocuted when he grabbed the two live wires with his left hand. He collapsed to the floor and was found dead.

What procedures should have been put in place to prevent this accident?

Answer 1

Safety procedures to prevent electrical accidents include shutting off the power at the circuit breaker, testing wires for being live, working one-handed or with insulated shoes to prevent current paths through the body, and implementing a three-wire system with proper grounding. Doubly insulated cases and correct plug designs are also important for safety.

Step-by-step explanation:

Electrical Safety Procedures

Several safety procedures should have been followed to prevent the accident involving the electrocution of the worker. First and foremost, the power should be shut off at the circuit breaker panel before attempting any electrical work. Additionally, the worker should have tested the wires using appropriate equipment to ensure they were not live before touching them.

A key practice in electrical safety is to work one-handed or even with 'one hand in your pocket', especially when working with high-power electric circuits. This reduces the risk of creating a current path through the heart if both hands come in contact with a voltage source and ground, as the human body is a good conductor due to its water content. Furthermore, wearing insulated shoes can prevent a pathway to ground through the feet by providing high resistance, enhancing personal safety.

It is also important to mention that the implementation of a three-wire system, which includes a live/hot, neutral, and earth/ground wire, provides additional safety. Grounding the case and ensuring the appliances have proper grounding prevent the risk of electric shock, as a ground fault causes the circuit breaker to trip, indicating a need for repair. Modern appliances are also designed to mitigate risks with features such as doubly insulated cases and asymmetrical plug designs that ensure correct wiring connections.

Understanding the consequences of electrical hazards, such as thermal and shock risks, and enforcing the use of systems like GFI (ground fault interrupters) to prevent these hazards is crucial for overall safety in electrical work environments.