12 Aug Energized Electrical Work – JSA

Electrical Troubleshooting Job Safety Analysis (JSA)

Job / Task

Inspection, testing, troubleshooting, diagnostic work, and other specifically justified tasks performed on or near exposed energized electrical conductors or circuit parts where an electrically safe work condition has not been established.

Purpose

This Job Safety Analysis (JSA), also known as a Job Hazard Analysis (JHA), identifies hazards associated with energized electrical work and establishes safe work practices and controls to prevent electric shock, electrocution, arc flash, arc blast, thermal burns, fires, falls, and other electrical-related injuries. De-energization and establishment of an electrically safe work condition is the preferred method of protection. Energized work shall be limited to conditions permitted by applicable regulations and electrical-safety procedures.

Personnel Qualifications

Work on or near exposed energized electrical conductors or circuit parts shall be performed only by qualified and authorized employees who have demonstrated the skills and knowledge necessary to recognize and avoid the electrical hazards involved.

Qualified employees shall:

• Understand the construction and operation of the equipment and the specific electrical hazards associated with the task.
• Be trained to distinguish exposed energized conductors and circuit parts from other equipment components.
• Understand nominal system voltage and applicable shock and arc-flash boundaries.
• Be trained in the selection, inspection, use, and limitations of electrical PPE and protective equipment.
• Be trained in safe work practices, insulated tools, test instruments, barriers, guarding, and safe body positioning.
• Understand the requirements for energized electrical work authorization or permits when applicable.
• Know how to release a person from contact with energized conductors without becoming a victim.
• Receive emergency response training appropriate to their duties, including first aid and CPR where required.
• Stop work whenever equipment condition, voltage, available energy, approach boundaries, PPE requirements, or other hazards are uncertain.

Required PPE

PPE shall be selected based on the shock and arc-flash risk assessments, nominal voltage, incident energy or applicable PPE category, equipment condition, and specific task. Required PPE may include:

• Safety glasses with side protection.
• Arc-rated face shield with balaclava or an arc-flash hood where required.
• Arc-rated clothing with an arc rating adequate for the identified exposure.
• Voltage-rated rubber insulating gloves with leather protectors where required.
• Voltage-rated insulating sleeves where required.
• Hard hat suitable for the electrical exposure.
• Hearing protection where required for arc-flash protection.
• Safety footwear appropriate for the work.
• Insulating mats, blankets, covers, line hose, or other protective equipment where required.
• Additional task-specific PPE identified by the electrical hazard assessment.

Electrical PPE and protective equipment shall be inspected before use and maintained and tested at required intervals. Meltable or flammable clothing that could increase injury severity shall not be worn where prohibited by the electrical hazard assessment or applicable requirements.

JSA – Job Steps, Hazards, and Controls

Step 1 – Determine Whether Energized Work Is Necessary

Potential Hazards

• Electric shock.
• Arc flash or arc blast.
• Unnecessary exposure to energized parts.
• Fatal electrical contact.

Required Controls

• Establish an electrically safe work condition whenever required and feasible.
• Determine whether the task qualifies for energized work under applicable regulations and electrical-safety procedures.
• Limit energized work to justified tasks such as certain diagnostic measurements, testing, or other permitted conditions.
• Do not perform energized work solely for convenience, scheduling, or production reasons.
• If energized work is not justified, de-energize, lock out/tag out, verify absence of voltage, and perform the task in an electrically safe work condition.

Step 2 – Review the Electrical System and Work Scope

Potential Hazards

• Unknown voltage.
• Multiple energy sources.
• Backfeed.
• Incorrect circuit identification.
• Unexpected system configuration.

Required Controls

• Review drawings, one-line diagrams, labels, equipment information, and the work scope before beginning.
• Identify normal, alternate, emergency, generator, UPS, photovoltaic, battery, capacitor, control, and other possible sources.
• Determine nominal voltage and available electrical hazard information.
• Verify equipment identification and do not rely on questionable or incomplete labeling.
• Resolve discrepancies before work proceeds.

Step 3 – Complete Required Energized Work Authorization

Potential Hazards

• Unreviewed hazardous work.
• Inadequate controls.
• Employees unaware of task hazards.

Required Controls

• Complete an energized electrical work permit when required by the applicable electrical-safety program.
• Document the work description, justification, shock and arc-flash hazards, boundaries, required PPE, safe work practices, and approval.
• Obtain required authorization before beginning work.
• Ensure the permit and job briefing reflect actual field conditions.
• Stop and reassess if conditions differ from those evaluated.

Step 4 – Conduct Shock and Arc-Flash Risk Assessments

Potential Hazards

• Electric shock.
• Arc flash.
• Incorrect boundary.
• Inadequate PPE.

Required Controls

• Identify shock hazards and determine applicable approach boundaries.
• Determine whether an arc-flash hazard exists and establish the arc-flash boundary when applicable.
• Select PPE and protective equipment based on the assessment and applicable electrical-safety requirements.
• Consider equipment condition and likelihood of an arc-flash event for the specific task.
• Do not begin work when required hazard information cannot be established.

Step 5 – Conduct the Job Briefing

Potential Hazards

• Miscommunication.
• Uncoordinated work.
• Unexpected energization or movement.
• Incorrect emergency response.

Required Controls

• Review the task, hazards, work procedures, special precautions, energy-source controls, PPE, boundaries, and emergency procedures with affected employees.
• Assign roles and responsibilities.
• Discuss changes from normal operating conditions and nearby work that could affect electrical safety.
• Repeat or supplement the briefing when the work scope or hazards change.
• Confirm all qualified employees understand the planned work before beginning.

Step 6 – Inspect the Equipment and Work Area

Potential Hazards

• Damaged equipment.
• Evidence of arcing.
• Water intrusion.
• Poor lighting.
• Restricted escape path.

Required Controls

• Inspect equipment condition before energized work.
• Look for loose parts, damaged insulation, missing covers, contamination, moisture, overheating, arcing, or other abnormal conditions.
• Provide adequate illumination without reaching blindly into electrical equipment.
• Maintain required working space and a clear escape path.
• Do not perform energized work on equipment whose condition creates unacceptable risk.

Step 7 – Establish Boundaries and Barricades

Potential Hazards

• Unqualified persons entering hazardous area.
• Shock exposure.
• Arc-flash exposure.
• Distraction.

Required Controls

• Establish applicable limited, restricted, and arc-flash boundaries.
• Use barricades, attendants, signs, or other controls when necessary to prevent unauthorized entry.
• Keep unqualified persons outside applicable boundaries unless requirements for entry are satisfied.
• Position barricades so they do not create additional trip or access hazards.
• Maintain control of the work area throughout the energized task.

Step 8 – Inspect and Don Electrical PPE

Potential Hazards

• Defective insulating equipment.
• Incorrect PPE rating.
• Exposed skin.
• PPE failure.

Required Controls

• Inspect arc-rated clothing, rubber insulating gloves, leather protectors, face protection, hard hats, and other required PPE before use.
• Verify voltage ratings, arc ratings, test dates, and condition as applicable.
• Remove defective or expired protective equipment from service.
• Wear PPE before crossing the boundary where it is required.
• Ensure clothing and PPE are properly fitted and do not introduce additional hazards.

Step 9 – Inspect Tools and Test Equipment

Potential Hazards

• Insulation failure.
• Meter failure.
• Probe slip.
• Phase-to-phase fault.

Required Controls

• Use insulated tools and test instruments appropriate to the voltage and task.
• Inspect tools, meters, probes, leads, and accessories before use.
• Verify test instruments have appropriate voltage and measurement-category ratings.
• Use guarded probes and expose only the minimum conductive probe tip necessary.
• Remove damaged or questionable tools and instruments from service.

Step 10 – Approach Exposed Energized Parts

Potential Hazards

• Electric shock.
• Arc-over.
• Loss of balance.
• Inadvertent contact.

Required Controls

• Maintain applicable approach distances.
• Only qualified persons with required protection shall enter the restricted approach boundary.
• Use insulating barriers, blankets, covers, or guards to protect against inadvertent contact with adjacent energized parts.
• Maintain stable footing and deliberate body positioning.
• Avoid reaching across exposed energized conductors or placing the body where an arc event would cause greater injury.

Step 11 – Perform Energized Testing or Diagnostic Work

Potential Hazards

• Electric shock.
• Arc flash.
• Probe slip.
• Short circuit.
• Unexpected equipment operation.

Required Controls

• Perform only the energized work necessary to obtain the required diagnostic information.
• Keep fingers behind probe guards and maintain control of test leads.
• Use one hand where practical and appropriate to reduce the likelihood of a current path across the chest.
• Keep unnecessary conductive objects away from energized parts.
• Maintain required PPE and boundaries throughout testing.
• Stop testing if abnormal equipment behavior, arcing, smoke, heat, or other unexpected conditions occur.

Step 12 – Operate Disconnects, Breakers, or Switchgear

Potential Hazards

• Arc flash or arc blast.
• Equipment failure.
• Flying debris.
• Burns.

Required Controls

• Determine the electrical hazard before operating equipment.
• Use required PPE when operation presents an arc-flash hazard.
• Stand to the side and use safe body positioning where appropriate.
• Keep enclosure doors and covers closed when equipment is designed to be operated in that condition.
• Do not repeatedly operate a device that trips or fails without identifying and correcting the cause.

Step 13 – Control Conductive Materials and Objects

Potential Hazards

• Short circuit.
• Electrical contact through tools or jewelry.
• Arc flash.

Required Controls

• Remove conductive jewelry and articles that could contact exposed energized parts.
• Use only necessary tools and materials inside the electrical work area.
• Secure loose hardware and conductive components.
• Use insulated tools where required.
• Do not place conductive objects on or near exposed energized equipment.

Step 14 – Transition from Energized Diagnosis to Repair

Potential Hazards

• Continuing unnecessary energized exposure.
• Unexpected energization.
• Shock or arc flash during repair.

Required Controls

• Once energized diagnostic work is complete, discontinue energized exposure.
• Identify all hazardous energy sources affecting the repair.
• De-energize equipment and apply lockout/tagout.
• Verify absence of voltage and control stored energy before beginning repair.
• Do not use energized troubleshooting as justification for performing repair work energized when an electrically safe work condition can be established.

Step 15 – Respond to an Electrical Incident

Potential Hazards

• Electric shock.
• Arc-flash burns.
• Fire.
• Secondary rescuer injury.

Required Controls

• Do not touch a person who remains in contact with an energized source.
• De-energize the source or use appropriate nonconductive rescue methods by trained personnel.
• Call emergency medical services immediately for serious electrical injury.
• Provide CPR, AED use, or first aid within the limits of employee training.
• Treat electrical shock and arc-flash injuries as potentially serious even when visible injuries appear limited.
• Preserve the incident area when appropriate for investigation after emergency hazards are controlled.

Step 16 – Complete Work and Restore Normal Conditions

Potential Hazards

• Exposed energized parts.
• Missing covers or barriers.
• Tools left in equipment.
• Incorrect system status.

Required Controls

• Account for tools, test equipment, jumpers, barriers, and temporary protective devices.
• Restore covers, dead fronts, guards, interlocks, and protective devices.
• Verify the equipment is in the intended operating condition.
• Remove barricades only after electrical exposure has ended.
• Document work, abnormal conditions, and unresolved hazards as required.
• Communicate final equipment status to affected personnel.

General Safe Work Requirements

• De-energization and establishment of an electrically safe work condition shall be the normal method of protecting employees from electrical hazards.
• Energized electrical work shall be performed only when permitted by applicable regulations and the employer’s electrical-safety program.
• Only qualified and authorized employees shall work on or near exposed energized electrical conductors or circuit parts.
• An energized electrical work permit shall be completed when required.
• Shock and arc-flash risk assessments shall be completed and applicable boundaries established before energized exposure.
• Required electrical PPE, insulating equipment, tools, and test instruments shall be properly rated and inspected before use.
• Unqualified and unauthorized personnel shall be kept outside applicable electrical boundaries.
• Employees shall use safe body positioning and minimize the time and extent of energized exposure.
• Once energized testing or diagnostics are complete, equipment shall be de-energized before repair whenever required.
• Work shall stop immediately when equipment condition, system configuration, voltage, hazard assessment, PPE, or other protective measures are inadequate or uncertain.

Training

Qualified employees performing energized electrical work shall receive training appropriate to the electrical hazards and tasks involved. Training shall include shock and arc-flash hazard recognition, approach boundaries, energized-work limitations and authorization, energized electrical work permits, job briefings, electrical PPE, insulated tools, test instruments, safe body positioning, emergency release methods, first aid and CPR where required, lockout/tagout, establishment of an electrically safe work condition, and stop-work expectations.

References

• OSHA 29 CFR 1910 Subpart S – Electrical, where applicable.
• OSHA 29 CFR 1910.147 – The Control of Hazardous Energy, where applicable.
• OSHA 29 CFR 1926 Subpart K – Electrical, where applicable.
• OSHA 29 CFR 1926.417 – Lockout and Tagging of Circuits, where applicable.
• NFPA 70E – Standard for Electrical Safety in the Workplace, current employer-adopted edition, where applicable.
• Applicable manufacturer instructions, electrical safety procedures, energized-work procedures, and hazardous-energy-control procedures.