The 5 Critical Electrical Safety Checks Before Any Maintenance Work

Maintenance work on electrical equipment carries inherent risks. Every year, workers suffer serious injuries and even fatalities from electric shock, arc flash, and arc blast. Yet most of these incidents are entirely preventable through simple but consistent safety checks.

This article outlines five critical safety checks to perform before beginning any electrical maintenance task. These steps are based on standards like NFPA 70E and OSHA regulations. Integrating them into your routine is essential for protecting yourself and your team.

Check 1: Perform a Task-Based Risk Assessment and Job Safety Briefing

Before touching any equipment or picking up a tool, stop and assess the job. Every maintenance task has unique hazards. A proper risk assessment identifies what could go wrong and establishes controls to mitigate those risks.

What is a Task-Based Risk Assessment?

A task-based risk assessment looks beyond the equipment itself. It considers the specific task you will perform, the equipment condition, the environment, and the people involved. Ask yourself:

• What task needs to be done? (e.g., troubleshooting, parts replacement, cleaning)
• Will I be near exposed energized parts?
• What is the equipment’s condition? (age, maintenance history, known issues)
• What is the work environment? (wet, confined space, explosive atmosphere, high temperature) 

Why a Job Safety Briefing Matters

The Job Safety Briefing is a team discussion covering the planned work, hazards, and protective measures. Key points include:

• Reviewing specific tasks and steps
• Identifying all energy sources
• Confirming everyone understands assigned roles
• Establishing communication methods for emergencies
• Reviewing the emergency action plan

A risk assessment isn’t a one-time event. Re-evaluate if conditions change during the job.

Check 2: Verify Proper Lockout/Tagout (LOTO) Procedures

Lockout/Tagout (LOTO) is one of the most critical safety procedures for maintenance work. It ensures equipment is completely de-energized and cannot be accidentally re-energized. LOTO is required by OSHA 29 CFR 1910.147 and is essential for NFPA 70E compliance.

The Key Steps of Electrical LOTO

1. Preparation and Notification : Identify all energy sources feeding the equipment. Notify all affected personnel that maintenance is about to begin.
2. Equipment Shutdown : Shut down the equipment using normal operating controls.
3. Energy Source Isolation: Physically isolate the equipment from all energy sources (electrical, mechanical, pneumatic, hydraulic). This means opening circuit breakers, pulling fuses, or closing valves.
4. Apply Lock and Tag : Each authorized worker applies their own personal lock and tag to each isolation point. Never share locks. Tags must clearly state “DANGER – DO NOT OPERATE” and include the worker’s name.
5. Release Stored Energy: Even after isolation, equipment can hold residual energy. This might include capacitors, compressed air, springs, or gravity. Release or block all residual energy sources.
6. Verify Isolation (“Try-Out”) : Do NOT assume equipment is safe. Try to start the equipment or, for electrical circuits, use a properly rated voltage tester to confirm zero voltage. Only proceed to the work task after ensuring a true zero-energy state.

Remember: Only the worker who applied a lock and tag is authorized to remove it when the job is complete

Check 3: Select and Inspect Personal Protective Equipment (PPE)

Even with LOTO and de-energized equipment, unexpected hazards can appear. The correct PPE is your final defense against electric shock, arc flash, and burns .

What PPE is Needed?

The required PPE depends entirely on the task, the voltage level, and the arc flash hazard category determined by your risk assessment .

Common electrical PPE includes:

• Arc-Rated (AR) Clothing: Flame-resistant shirts, pants, coveralls, or suits. The arc rating (measured in cal/cm²) must match the incident energy level. Cotton clothing alone is NOT sufficient for arc flash protection.
• Safety Glasses or Arc-Rated Face Shield: Protects eyes and face from arc flash and debris.
• Arc-Rated Hard Hat and Balaclava (Hood): Protects the head and neck.
• Rubber Insulating Gloves with Leather Protectors: Protect against electric shock. Gloves must be rated for the voltage and tested at regular intervals.
• Arc-Rated Gloves: Worn over leather protectors to provide hand protection from heat.
• Voltage-Rated Footwear: Adds protection against step and touch potential.
• Hearing Protection: Arc flashes can produce noise levels loud enough to cause permanent hearing damage.

Inspect and Maintain PPE

Before each use, carefully inspect all PPE:

• Check rubber gloves for cuts, punctures, swelling, or ozone damage.
• Check hard hats for cracks or damage.
• Check arc-rated clothing for holes, tears, or contamination (which can reduce effectiveness).
• Ensure safety glasses or face shields are clean and scratch-free.

Store PPE properly and remove damaged PPE from service. A documented method for maintaining required PPE is essential for NFPA 70E compliance 

Check 4: Visually Inspect All Equipment, Tools, and Cords

A thorough visual inspection can catch obvious problems that lead to failure. This check applies to the equipment you’re servicing, the tools you’ll use, and extension cords.

Inspect the Equipment

Before performing maintenance, visually inspect the equipment for :

• Loose, Missing, or Broken Parts: Check fasteners, covers, handles, and components.
• Signs of Overheating: Look for burn marks, discoloration, or staining on or inside equipment .
• Cleanliness: Ensure no dirt, grease, or dust could cause tracking or overheating .
• Corrosion or Water Damage: Check for rust, moisture, or signs of leaks.
• Proper Labeling: Ensure arc flash and shock warning labels are present and legible .

Inspect Tools and Cords

• Check the Plug: Is it correctly wired? Is the fuse correctly rated? Is the plug damaged? 
• Check the Cable: Is it damaged? Look for cuts, frayed insulation, taped repairs, or loose internal wires.
• Check for Proper Grounding: Verify equipment is properly grounded .
• Check Cords for Tripping Hazards: Position trailing wires to prevent trips and damage .

If you find a problem, tag the item “DO NOT USE” and repair or replace it before starting work 

Check 5: Verify Equipment and Voltage Rating

Before connecting or working on equipment, ensure it matches the electrical supply.

Use a Residual Current Device (RCD) or GFCI: RCDs/GFCIs detect leakage current and trip the supply quickly, reducing shock risk. They are essential in harsh or wet environments . Test the RCD by pressing the “Test” button before use .

Check Voltage and Current Requirements: Verify the equipment’s voltage, phase, and current rating match the power source. This prevents overloading circuits or equipment .

Check Protection Device Rating: Ensure fuses and circuit breakers protecting the equipment are correctly sized. Overrated fuses can allow equipment to draw unsafe current before tripping .

Check Equipment Suitability: Is equipment physically capable of the task? Is it appropriate for the environment? For damp conditions, lower-voltage tools (110V) or battery-powered tools are safer .

Conclusion

These five critical checks risk assessment, LOTO, PPE, visual inspection, and voltage verification are your frontline defenses. Integrating them into every maintenance routine builds a safer workplace and prevents unnecessary injuries.

Final Reminder: Only qualified personnel with appropriate training, skills, and experience should perform electrical maintenance. When in doubt, stop and consult a competent person.