Electric shock and electrocution are serious workplace hazards that can lead to severe injuries or fatalities. Whether in industrial, commercial, or construction settings, understanding these risks and knowing how to respond is essential to maintaining a safe and compliant work environment.
This article provides comprehensive information on electric shock and electrocution, including the causes, effects on the human body, symptoms, and preventive measures to ensure worker safety.
What is an Electric Shock?
An electric shock is the physiological reaction or injury caused by an electric current passing through the body. It occurs when a person becomes part of an electrical circuit, typically by touching two points of different voltage, such as a hot wire and a neutral wire, or between a live source and the ground. The severity of a shock can range from a mild tingle to serious injury or even death. Factors such as voltage, current, contact duration, and the condition of the skin, whether it’s wet, can increase the risk of fatal injuries.
What is Electrocution and When Does it Happen?
Electrocution comes from blending "electrocity" and "execution," and refers to death or severe injury caused by electric shock. It occurs when an individual comes in contact with lethal amounts of current, leading to severe burns, respiratory arrest, or heart failure.
Difference Between Electric Shock and Electrocution
Electric shock refers to the body's response to electric current, which can range from a mild tingle to serious injury, while electrocution is the most severe consequence of an electrical incident, occurring when electric current causes death or fatal injuries. We can say that every electrocution is an electric shock, but with proper safety measures, not every shock has to result in electrocution.
Common Causes of Electrical Shock and Electrocution in the Workplace
Recognizing the common causes of electric shock and electrocution is the first step toward implementing effective preventative safety measures. Let’s look at the common preventable electrical hazards that lead to these electrical incidents:
Contact with Overhead Power Lines: Uninsulated high-voltage lines can lead to electrocution, especially if workers use equipment like cranes or ladders nearby.
Exposed Energized Parts: Unsecured components or uninsulated wiring can result in direct contact with live current.
Damaged Tools and Equipment: Frayed cords and faulty equipment pose significant risks.
Lack of Ground-Fault Protection: Without Ground-Fault Circuit Interrupters (GFCIs), current can pass through a worker's body during a ground fault.
Improper Work Practices: Inadequate training and failure to follow lockout/tagout (LOTO) procedures can increase risk.
Wet Conditions: Operating electrical devices in damp environments can heighten the risk of electrocution.
Understanding these hazards can help facilities take appropriate safety measures to protect employees from risks of electric shock and electrocution.
Effects of Electric Shock and Electrocution on the Human Body
The physiological effects of electric shock and electrocution depend on several factors: the amount of current (amperage) flowing through the body, the pathway the current takes, the duration of exposure, and the resistance of the body, which is influenced by factors such as moisture or skin condition. Other factors include voltage, frequency (AC vs. DC), and the area of contact. In a workplace setting, where the voltage is often higher, the potential for severe harm is greater.
Immediate Effects:
Muscle Contractions: Electric shock can cause involuntary muscle contractions, which may prevent the person from releasing the electrical source. In extreme cases, muscle contractions can lead to fractures or joint dislocations.
Burns: Burns often occur at the points where electricity enters and exits the body. These burns can be severe, requiring immediate medical treatment.
Cardiac Arrest: A high-voltage electric shock can disrupt the electrical signals in the heart, leading to arrhythmia or cardiac arrest.
Respiratory Failure: High voltage can affect the body’s ability to breathe, paralyzing the muscles necessary for respiration.
Long-Term Effects:
Nerve Damage: Prolonged exposure can cause irreversible nerve damage, leading to chronic pain, numbness, or loss of motor control.
Psychological Effects: Survivors of electric shock may experience anxiety, depression, or PTSD from the traumatic event.
Permanent Disabilities: Severe electric shock can result in permanent physical disabilities, such as burns, loss of limbs, or impaired motor function.
Symptoms of Electric Shock and Electrocution
The symptoms of electric shock and electrocution depend on the severity of the exposure. Key symptoms include:
Mild to Moderate Electric Shock: Tingling, numbness, mild pain, or muscle spasms at the site of contact.
Severe Electric Shock: Loss of consciousness, irregular heartbeat, burns, seizures, or difficulty breathing.
Electrocution: Cardiac arrest, respiratory failure, deep burns, unconsciousness, and potentially fatal injuries.
If any of these symptoms are noticed, immediate medical attention is required.
What to Do Incase of Electric Shock in the Workplace
Quick action after an electric shock is essential to saving lives and reducing the severity of injuries. If you or anyone in the workplace experiences an electric shock:
- Don’t Touch the Victim: If the person is still in contact with the electrical source, do not touch them directly. You could become the next victim. Use a non-conductive object, such as a wooden stick or rubber tool, to disconnect the electrical source.
- Turn Off the Power: If possible, shut off the power supply to the affected area. This will stop the electrical current and prevent further harm.
- Call Emergency Services: Immediately call for medical help, especially if the individual is unconscious, not breathing, or shows signs of cardiac arrest.
- Perform CPR: If the victim is not breathing, begin CPR if trained, and continue until medical professionals arrive. CPR can save lives during cardiac arrest caused by electrocution.
- Don’t Move the Victim: Unless there’s an immediate threat, avoid moving the injured person. Moving them could exacerbate their injuries, especially if there’s spinal damage.
- Monitor for Shock: After ensuring the person is away from the electrical source, check for signs of shock. Keep the victim warm and lying down until help arrives.
Safety Measures to Prevent Electric Shock and Electrocution
Developing and implementing a robust electrical safety program is crucial for preventing electric shock and electrocution in the workplace. Key safety measures include enclosing live electrics so that only qualified personnel can access them, ensuring all employees receive thorough training relevant to their exposure level, safely storing all hazardous equipment, and performing regular inspections.
The electrical safety program should also incorporate additional critical practices, such as safety signs, implementing Lockout/Tagout procedures, using GFCIs in appropriate locations, and providing and enforcing the use of proper arc-rated PPE when working with energized equipment is unavoidable. By implementing these safety measures, employers can protect employees from electric shocks and potential electrocution.