Electrical Safety in the Workplace: Preventing Shock and Electrocution

Electricity is so integral to modern workplaces that it is easy to underestimate its dangers. Yet electrical hazards remain one of the leading causes of workplace fatalities in British Columbia and across Canada. From construction sites and manufacturing plants to offices and retail spaces, the risk of electrical shock, burns, and electrocution exists wherever electricity is present. Understanding these hazards and implementing proven prevention strategies is not just a regulatory requirement; it is a fundamental responsibility that protects lives.

Common Electrical Hazards in the Workplace

Electrical hazards take many forms, and they are not limited to workers who perform electrical work. Anyone who uses electrical equipment, works near power lines, or operates in environments with electrical installations can be exposed to risk. The most common electrical hazards in BC workplaces include:

• Contact with exposed live parts such as damaged wiring, open panels, and improperly guarded equipment
• Overhead and underground power lines that pose a particular danger on construction sites and in utility work
• Faulty or damaged equipment including frayed cords, broken plugs, and malfunctioning tools
• Overloaded circuits caused by connecting too many devices to a single outlet or circuit
• Wet conditions that dramatically increase the conductivity of surfaces and the risk of shock
• Improper grounding of equipment and electrical systems
• Static electricity in environments with flammable vapours, dust, or gases
• Inadequate clearance from energized parts during maintenance and construction activities

The consequences of electrical contact range from minor tingling sensations to severe burns, cardiac arrest, and death. Even non-fatal electrical injuries can cause long-term neurological damage, chronic pain, and psychological trauma that affects a worker for years after the initial incident.

Lockout/Tagout (LOTO) Procedures

Lockout/tagout is one of the most critical safety procedures for preventing electrical injuries during equipment maintenance, repair, and servicing. LOTO involves de-energizing electrical equipment and applying physical locks and warning tags to energy-isolating devices to prevent the accidental re-energization of equipment while workers are performing tasks on or near it.

Steps in a Proper LOTO Procedure

A thorough lockout/tagout procedure follows a systematic sequence that must be strictly adhered to every time:

• Preparation: Identify all energy sources associated with the equipment, including electrical, mechanical, hydraulic, pneumatic, chemical, and thermal energy
• Notification: Inform all affected workers that equipment will be shut down and locked out
• Shutdown: Turn off the equipment using the normal operating controls
• Isolation: Disconnect or isolate all energy sources using the appropriate energy-isolating devices such as circuit breakers, disconnect switches, or valves
• Lock and tag: Apply individual locks and tags to each energy-isolating device. Each worker who will be working on the equipment must apply their own personal lock
• Verification: Attempt to restart the equipment to confirm it is completely de-energized. Test the circuit with a voltage tester to verify zero energy state
• Release stored energy: Discharge any residual energy, including capacitors, springs, elevated components, or pressurized systems

Only the worker who applied a lock may remove it. This principle is fundamental to LOTO safety and must never be violated. If a worker leaves the site with their lock still in place, specific procedures must be followed to safely remove it, and these should be documented in the employer's LOTO program.

Arc Flash Awareness

An arc flash is an explosive release of energy caused by an electrical fault or short circuit. During an arc flash, temperatures can reach up to 35,000 degrees Fahrenheit, which is four times hotter than the surface of the sun. The blast produces intense light, extreme heat, a pressure wave, molten metal, and toxic gases, all within a fraction of a second.

Arc flash incidents can cause severe burns, blindness, hearing loss, and death. Even workers standing several metres away from an arc flash can suffer serious injuries from the radiant heat and pressure wave. The risk of arc flash is present whenever workers operate, maintain, or work near energized electrical equipment, particularly at voltages above 208 volts.

Prevention of arc flash incidents involves maintaining safe working distances from energized equipment, performing an arc flash risk assessment to determine incident energy levels, de-energizing equipment before performing work whenever possible, and ensuring that workers who must work on or near energized equipment are trained, qualified, and wearing appropriate arc-rated PPE.

Personal Protective Equipment for Electrical Work

PPE is the last line of defence against electrical hazards and must be used in conjunction with engineering and administrative controls, not as a substitute for them. The type and level of PPE required depends on the specific hazard and the voltage involved.

• Insulated gloves rated for the appropriate voltage class, along with leather protector gloves worn over them to prevent physical damage
• Arc-rated clothing including flame-resistant shirts, pants, and coveralls with an arc thermal performance value (ATPV) appropriate for the incident energy level
• Face shields and safety glasses with arc-rated protection to guard against flash burns and molten metal
• Insulated tools specifically designed for electrical work, with insulation rated for the voltages being worked on
• Dielectric footwear that prevents current from passing through the body to ground
• Hard hats rated for electrical protection (Class E) when working near overhead hazards

All electrical PPE must be inspected before each use and tested at regular intervals as specified by the manufacturer and regulatory requirements. Insulated gloves, for example, must be visually inspected and air-tested before every use and electrically tested at intervals not exceeding six months.

Ground Fault Circuit Interrupters (GFCIs)

Ground fault circuit interrupters are life-saving devices that detect imbalances in electrical current and shut off the circuit within milliseconds. A ground fault occurs when electrical current finds an unintended path to ground, often through a person's body. GFCIs monitor the current flowing through the hot and neutral conductors and trip the circuit when a difference as small as 5 milliamps is detected.

WorkSafeBC requires GFCIs in several workplace situations, including all temporary wiring on construction sites, outdoor receptacles, and any location where workers use portable electrical equipment in wet or damp conditions. Employers should go beyond minimum requirements and install GFCIs wherever the risk of ground faults exists. GFCIs must be tested regularly, ideally before each use, by pressing the test button and verifying that the device trips properly.

Safe Work Practices Around Energized Equipment

Whenever possible, electrical equipment should be de-energized before any work is performed. However, there are situations where working on or near energized equipment is unavoidable, such as when de-energizing would create a greater hazard or when the equipment must be energized for testing and diagnostic purposes.

When work on energized equipment is necessary, only qualified electrical workers should perform the task. These workers must use a written safe work procedure that identifies the hazards, specifies the required PPE, establishes safe approach distances, and outlines emergency procedures. A safety watch should be present to monitor conditions and provide immediate assistance if needed. Conductive tools and materials must be kept away from energized parts, and workers must remove all jewellery, watches, and other conductive items before beginning work.

First Aid for Electrical Burns and Shock

Electrical injuries require specific first aid considerations that differ from other types of burns and trauma. The first priority is always to ensure the scene is safe. Never touch a person who is still in contact with an electrical source. De-energize the power source if it can be done safely, or use a non-conductive object to separate the person from the electrical contact.

Once the person is free from the electrical source, assess their responsiveness and breathing. Electrical shock can cause cardiac arrest, so be prepared to perform CPR if the person is unresponsive and not breathing normally. Call emergency medical services immediately for any significant electrical injury, as internal damage may be far more extensive than what is visible on the surface.

Electrical burns often have entry and exit wounds that may appear small but can conceal severe tissue damage beneath the skin. Cool the burned areas with running water and cover them with clean, dry dressings. Do not apply ice, butter, or other home remedies. Monitor the person for signs of shock, including pale skin, rapid breathing, weakness, and confusion, and keep them warm and comfortable while waiting for emergency services to arrive.

WorkSafeBC Electrical Safety Regulations

WorkSafeBC regulates electrical safety under Part 19 of the Occupational Health and Safety Regulation. These regulations establish requirements for safe work practices, qualifications for workers performing electrical work, maintenance of electrical equipment, and protection of workers from electrical hazards. Key provisions include mandatory safe limits of approach distances for energized conductors, requirements for lockout and de-energization procedures, qualifications and training requirements for electrical workers, and standards for electrical equipment inspection and maintenance.

Employers must ensure that all electrical work is performed by qualified persons, that safety procedures are documented and followed, and that workers receive adequate training on the electrical hazards present in their workplace. At Mainland Safety Training, our courses include essential electrical safety awareness and first aid response for electrical emergencies, preparing workers across all industries to recognize and respond to these critical hazards.