​On construction sites across America, workers face numerous hazards daily. Among these, OSHA has identified four that cause the majority of construction fatalities – the "Focus Four" hazards: Falls, Struck-by, Caught-in/between, and Electrical. While falls remain the leading cause of death in construction, electrical hazards present unique and often invisible dangers that require specific knowledge and precautions.

Before diving specifically into electrical safety, it's important to understand the context of OSHA's Focus Four initiative. These four hazard categories:

1. Falls – Responsible for approximately 36% of construction fatalities
2. Struck-by – Accounting for about 10% of construction deaths
3. Caught-in/between – Causing roughly 2% of construction fatalities
4. Electrical – Resulting in approximately 9% of construction deaths

Together, these four hazard types account for nearly 60% of all construction worker deaths. OSHA's emphasis on these "Fatal Four" drives inspection priorities, compliance assistance, and targeted training efforts throughout the industry.

​Electrical hazards on construction sites typically fall into three main categories:

When workers contact energized parts, current flows through the body, potentially causing:

• Muscle contractions and inability to release from the source
• Internal organ damage
• Cardiac arrest
• Fatal electrocution

Even relatively low voltages can be deadly. While it takes at least 500 milliamps to cause heart fibrillation, as little as 10-30 milliamps can cause muscle paralysis, preventing a worker from releasing their grip from an energized source.

Arc flashes occur when electrical current leaves its intended path and travels through the air from one conductor to another or to ground. These events:

• Create temperatures up to 35,000°F
• Cause severe burns
• Produce blinding light
• Create pressure waves that can throw workers
• Generate sound blasts up to 140 dB

Electrical faults can ignite flammable materials and atmospheres, leading to:

• Workplace fires
• Explosions in confined spaces
• Secondary hazards from damaged equipment

OSHA addresses electrical safety in construction primarily through:

• 29 CFR 1926 Subpart K (Electrical) – Covering installation safety requirements, wiring methods, and equipment
• 29 CFR 1910.147 – The Control of Hazardous Energy (Lockout/Tagout)
• NFPA 70E – Referenced by OSHA for electrical safety best practices

Competent Person OversightAll electrical work should be performed under the supervision of a competent person who:

• Can identify existing and predictable electrical hazards
• Has authorization to take prompt corrective measures
• Understands relevant OSHA standards and regulations

Proper Training and QualificationWorkers must be trained on:

• Electrical hazard recognition
• Safe work practices
• Personal protective equipment requirements
• Emergency response procedures

Electrical work should only be performed by qualified persons who have:

• Received training on the construction and operation of equipment
• Demonstrated skills in safe techniques
• Knowledge of appropriate test equipment
• Understanding of the applicable codes

Ground Fault ProtectionOSHA requires ground-fault protection through either:

• Ground Fault Circuit Interrupters (GFCIs) – These devices detect imbalances in electrical current and quickly shut off power
• Assured Equipment Grounding Conductor Program – A scheduled system of testing cords, receptacles, and equipment

GFCIs are required on all 120-volt, single-phase, 15- and 20-ampere receptacles that are not part of the permanent wiring of a building or structure.
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Lockout/Tagout Procedures
Before working on electrical systems:

• Disconnect from all energy sources
• Lock out all disconnect switches
• Verify the equipment is de-energized using proper test equipment
• Apply warning tags to prevent accidental re-energization

Extension Cord and Power Tool Safety
Temporary wiring presents significant hazards on construction sites:

• Inspect cords before each use
• Remove damaged cords from service immediately
• Protect cords from damage (avoid pinch points, vehicle traffic)
• Never use cords as rigging or lifting devices
• Keep connections dry and off the ground

Overhead Power Line Safety
Contact with overhead power lines causes many electrocutions:

• Maintain minimum clearance distances (typically 10 feet for lines under 50kV)
• Use dedicated spotters when working near power lines
• Consider power lines energized until confirmed otherwise
• Use non-conductive ladders when working near electrical hazards

Personal Protective Equipment (PPE)
Select PPE based on the specific electrical hazards:

• Voltage-rated gloves with leather protectors
• Arc-rated clothing appropriate for the hazard level
• Face shields and safety glasses
• Insulated tools
• Non-conductive head protection

​An effective electrical safety program includes:
Risk Assessment

• Identify all potential electrical hazards on site
• Evaluate the risk of injury for each task
• Document findings and communicate to workers

Written Procedures

• Develop detailed procedures for all electrical tasks
• Create job-specific instructions for high-risk activities
• Include emergency response protocols

Regular Inspections

• Conduct daily visual inspections of cords and equipment
• Perform scheduled testing of all temporary wiring
• Document and correct all deficiencies

Continuous Training

• Provide initial and refresher training
• Address site-specific hazards
• Include demonstrations and hands-on practice

Emergency Response Planning
Despite precautions, electrical incidents may occur. Workers should know:

• How to respond to an electrical incident
• Proper methods for freeing a person from energized contact
• CPR and first aid for electrical injuries
• Fire response procedures for electrical fires

As one of OSHA's Focus Four hazards, electrical safety demands comprehensive attention on every construction site. The invisible nature of electricity makes it particularly dangerous, as workers cannot rely on their senses to detect hazards before contact occurs.
By implementing a thorough electrical safety program that addresses training, equipment inspection, proper work practices, and emergency response, construction companies can significantly reduce the risk of electrical injuries and fatalities. Remember that electrical safety isn't just about compliance—it's about ensuring every worker returns home safely at the end of each day.

Let us help you create your electrical program or view our videos to give you a greater understanding of the OSHA Electrical Standard.

​Struck-by hazards represent one of OSHA's "Fatal Four" leading causes of workplace fatalities in construction, but they pose significant risks across all industries. Understanding these hazards and implementing proper safety measures can prevent serious injuries and save lives.

​Struck-by injuries occur when a worker is hit by a moving object or piece of equipment. OSHA categorizes these hazards into four main types:

​Struck-by hazards present significant risks in many workplaces, but they can be effectively managed through proper planning, training, and safety measures. By understanding these hazards and implementing comprehensive prevention strategies, organizations can protect their workers and maintain OSHA compliance.